1991 CRX Turbo B18 project/build thread - Honda-Tech - Honda Forum Discussion


1991 CRX Turbo B18 project/build thread

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Old 02-07-2017, 10:42 AM   #1
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Default 1991 CRX Turbo B18 project/build thread

It is a 1991 HF chassis that was brought up from Florida, never seen snow and is completely rust free. Mileage on the chassis is unknown, but it's clean and most everything in the suspension and brakes has been replaced. Engine and turbo setup has an estimated 5,000 miles on it. Hoping I won't need to put a ton of more money into it, but accepting the fact that I might put a little. I am sure this list is missing a few items.


Engine:
  • GSR Block
  • Wiseco Pistons
  • Eagle Rods
  • Stage 5 RPM Ported B16 Head
  • GSR Cams
  • Cable LS Trans
  • Stock Axles
  • Comp Stage 5 Sprung Clutch
  • Walbro 340, 255LPH Pump
  • FIC 1000cc Injectors
  • 6AN Fuel Lines
  • Hondata S300 V1 Tuned on e85 at 20psi
  • AEM Wideband and Gauges
  • Precision GT3255E w/Upgraded Compressor
  • Manual boost controller
  • Blox IM with 90mm TB
  • MG Fab Stainless Turbo Manifold
  • Tial Wastegate
  • 3” Downpipe and Full 3” Exhaust w/2 Magnaflow Mufflers
  • Full Race 20" x 11" x 3" FMIC
  • HKS BOV
  • Fluidyne Radiator
  • Dual Vented VC with Catch Can & Breather
Chassis:
  • Tein Springs
  • KYB Struts
  • Skunk 2 Front UCA’s
  • Skunk 2 Rear LCA’s and Upper Camber Kit
  • Legend Front BBK w/2-Piston Calipers
  • Rear Disk Conversion
  • Stainless Brake Hoses
  • Full Race Traction Bar
  • 949 Racing 6UL Wheels, 15X9
  • Hankook Tires
  • VIS CF Hood
  • Battery Relocated to Rear Hatch
Here it is the day I brought it home, after an hour drive on the highway and about 15 degrees outside with no heat. It was not a pleasant drive, and there were some concerning things about the car that arose during that time, but I'll get to those later.... Haven't taken thorough pics yet due to the cold weather.












Here are the initial issues-


Front end clacking noise under deceleration:
Upon driving the car home, I noticed it made some strange noises, most concerning being that when decelerating in gear, there was a rhythmic clacking-type noise coming from somewhere at the front of the car. The cause of this is still unknown, I am hoping it is not a major transmission or differential problem. Planning to change the trans fluid, and see if anything telling comes out in the old oil. Best case scenario, could just be noise from the brakes and slightly warped rotors not getting warmed up? Idk.


Misfiring, not starting in cold, running rough, wouldn't rev over 3000rpm:
The seller had told me not to drive it hard because it had old e85 in the tank, so I was apprehensive and did not want to push it any further to investigate at the time. It was also strange because at times it would seem to run okay, then others it was terrible. Seller also had never driven it in cold weather, so I wondered if maybe the tune had not been compensated properly for this. I downloaded the calibrations from the Hondata S300 to see if there were any settings I could play with to get it to run smoother in cold temperatures, or at least fire up quicker when cranking. I found somewhere that it takes 3 times as much e85 to get an engine started in cold weather as it does e10, so it got me thinking.

I downloaded the maps, had some people on here look them over and everything looked fine. It was when I tried uploading it to the ECU with a couple of minor changes that, not only did the upload fail, I noticed a solid red light on the ECU. I didn't know what this meant at first, but basically after a little research and help on the Hondata forum, the battery in the S300 V1 had died, so it had been running in limp mode. Apparently, at least my theory is that as the V1 was dying, it was switching in and out of limp mode, which is what caused it to run so crappy some times, and run okay other times. Try as I might, I could not get it back to a green light on the ECU. This is my first expense towards the car.

Now I have sent my ECU to be upgraded to the S300 V3 with bluetooth, and get the capacitors upgraded on the ECU. Hoping it comes back, plugs in, lets me upload the map and runs like a champ. Fingers crossed.


Transmission/clutch/differential noise:
I noticed the last couple times I started it, if I release the clutch pedal in neutral, there is a lot of noise that comes from the transmission once it starts spinning. It is somewhere between a rattle and gear noise. Also when driving, especially in first and a little in second, there is some pretty major gear noise/whining under acceleration. Sounding almost like straight cut gears. However, the transmission shifts in and out of all gears reasonably well and operates like it should. Again, hoping that the fresh trans fluid will help or at least let me know if there is a major problem.


Oil leak from turbo feed or return line:
Last night I got under the car for the first time, and noticed everything is coated in fresh oil. I traced it up the oil pan on the front, and up the return line to the turbo. Although it appears to be originating from the return line, I suspect it is actually coming from somewhere on the pressure line side. It is very hard to see anything on the top side of the turbo, so this I need to dig into.


Torn shift linkage bushing? on transmission:
While under the car I also found a piece of rubber, looks like a bushing of some sort on the end of the shift linkage hooking to the transmission. The rubber piece was broken and I just pulled it off. Will get pics later on, not sure if this is an issue.


Turbo compressor touching radiator:
I doubt there is anything that can be done about this, just concerns me a little. Previous owner mounted the front of the engine solid to the full race cross member to prevent the turbo from eating into the rad. If it has lasted this long without causing and issue, I guess it will be OK but I won't be terribly surprised if it ever springs a leak.




Here's what I have in the works so far:

- Upgrading Hondata to S300 V3, updating ECU capacitors
- Trans fluid change with Acura MTF
- Reducing boost to 17psi max until I get a feel for it
- Purchased e85 tester and "e85 only" sticker for the gas door
- Fixing oil leak on turbo feed line



Possible upgrades for the future:

- Upgrade axles
- LSD
- Boost by gear
- Considering window tint and blacking out the lights and reflectors on the car. Not sure how it would look on a white car tho might just leave the stock look.



Thanks for reading! Will update as I diagnose or fix issues, will get more pics and add any more upgrades I decide to do.

Last edited by 2x0; 06-14-2017 at 05:39 AM.
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Old 02-07-2017, 10:48 AM   #2
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Default Re: 1991 CRX Turbo B18 project/build thread

very nice looks good. and not so many big issues. cant wait for it all to be done.

sending ecu straight to hondata ? I need to upgrade mines too once I park car this week and store it to work on it
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Old 02-07-2017, 10:57 AM   #3
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Default Re: 1991 CRX Turbo B18 project/build thread

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very nice looks good. and not so many big issues. cant wait for it all to be done.

sending ecu straight to hondata ? I need to upgrade mines too once I park car this week and store it to work on it
Yep Hondata will be doing the update to the ECU and swapping the V1 for the V3. I over-nighted it today and am hoping to get it back by the weekend so I can do some tunin'

It was $430 for the update package being that my V1 was toast, but I figure the one place you don't want to skimp out is engine management.
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Old 02-07-2017, 11:14 AM   #4
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Default Re: 1991 CRX Turbo B18 project/build thread

welcome by the way. well mine is working fine so I hope only 280 for me as page says lol and very true

this is my 91 ef im working on


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Old 02-07-2017, 11:37 AM   #5
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Default Re: 1991 CRX Turbo B18 project/build thread

That looks awesome! Can't wait to get mine runnin good.

Looks like you had to raise the hood up for clearance? I was surprised that my hood closes fine, but then I noticed that there is only about 3" of clearance from my oil pan to the ground
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Old 02-07-2017, 11:39 AM   #6
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Default Re: 1991 CRX Turbo B18 project/build thread

yeah if not it hits. car will be going down for a month or so for upgrades
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Old 02-07-2017, 11:53 AM   #7
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Default Re: 1991 CRX Turbo B18 project/build thread

Its good to see Gunny's old crx getting some love from a new owner. I remember his build from MnHonda's, we turboed our crx's at the same time maybe 6-7 years ago. Looks like it hasnt changed at all from that time! I always wished he got a larger FMIC to fit the crx grill better, other then that the car looks very clean! Good luck with the build, hopefully you can make it to TopEnd to race it this upcoming season.
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Old 02-07-2017, 12:45 PM   #8
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Default Re: 1991 CRX Turbo B18 project/build thread

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Its good to see Gunny's old crx getting some love from a new owner. I remember his build from MnHonda's, we turboed our crx's at the same time maybe 6-7 years ago. Looks like it hasnt changed at all from that time! I always wished he got a larger FMIC to fit the crx grill better, other then that the car looks very clean! Good luck with the build, hopefully you can make it to TopEnd to race it this upcoming season.
Hey there, I wondered when someone who recognized this car would turn up on the forums. Yeah I tried looking for his build thread on MnHonda's when I was considering the purchase, but it looks like that site is down now. Is there another forum where more of our regional enthusiasts get together?

It's weird because for all of my past projects, I've lived in different states but always had some fellow tuners to cruise around with. In MN everyone just likes their trucks and snowmobiles...
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Old 02-08-2017, 11:22 AM   #9
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Hey there, I wondered when someone who recognized this car would turn up on the forums. Yeah I tried looking for his build thread on MnHonda's when I was considering the purchase, but it looks like that site is down now. Is there another forum where more of our regional enthusiasts get together?

It's weird because for all of my past projects, I've lived in different states but always had some fellow tuners to cruise around with. In MN everyone just likes their trucks and snowmobiles...
Yup, mnhondas and every other site similar is gone. People just use bull **** Facebook groups, so you can try to find some of those.. There are plenty of people building and racing Hondas in Minneapolis. Check out BIR if your new to the area, you will see most of the fast hondas in the area there.

People in MN/ND just garage their cars during the winter for the most part. Come spring you will see plenty of nice cars.
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Old 02-08-2017, 06:01 PM   #10
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There are plenty of people building and racing Hondas in Minneapolis. Check out BIR if your new to the area, you will see most of the fast hondas in the area
I figured there might be, thanks for that I will check it out. Always good to have some fellow enthusiasts nearby to share builds with.

No news yet on mine but my ecu should be getting reworked by Hondata at this very moment. I also received my Acura MTF today ordered from K series parts. Hoping on Saturday I have the time to drain the tranny and see whats up, plug in the new ecu if I have it back yet, and fix the oil leak. If all goes well, which it seldom does, I may be out on the road next week while enjoying the 40-degree weather
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Old 02-09-2017, 12:19 PM   #11
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Default Re: 1991 CRX Turbo B18 project/build thread

Received my ECU back today with the brand new Hondata S300 V3 installed! Took a total of two days from when I shipped it, pretty awesome! Also considering you get an entirely new S300 for much less than retail price, came with a new USB cable, some decals and everything.

Can't wait to get it hooked up this weekend
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Old 02-09-2017, 04:15 PM   #12
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Default Re: 1991 CRX Turbo B18 project/build thread

Tonight I changed the tranny fluid. Old fluid had some fine metal glitter in it but looked pretty normal. Also may have fixed oil leak, I was able to get about 1/4 turn on one of the return flange bolts, we'll see if that fixes it.

Pics also showing the broken shift linkage bushing. I figure I'll worry about this when I start having trouble shifting...






Now I just need to plug in the ecu and upload a tune!
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Old 02-09-2017, 05:45 PM   #13
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Default Re: 1991 CRX Turbo B18 project/build thread

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Transmission/clutch/differential noise:
I noticed the last couple times I started it, if I release the clutch pedal in neutral, there is a lot of noise that comes from the transmission once it starts spinning. It is somewhere between a rattle and gear noise. Also when driving, especially in first and a little in second, there is some pretty major gear noise/whining under acceleration. Sounding almost like straight cut gears. However, the transmission shifts in and out of all gears reasonably well and operates like it should. Again, hoping that the fresh trans fluid will help or at least let me know if there is a major problem.
Search for 'noisy throw-out bearing' and see if that is your problem, it's a pretty common problem that can be diagnosed pretty accurately by letting the car idle (noisy) pressing the clutch in (noise stops).

Keep in mind some aftermarket clutch types do make a similar noise to this though and it's normal.
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Old 02-10-2017, 04:35 AM   #14
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Default Re: 1991 CRX Turbo B18 project/build thread

I thought I read at v3 hondata is blue tooth?
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Old 02-10-2017, 05:00 AM   #15
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I thought I read at v3 hondata is blue tooth?
It is. I don't have a bluetooth laptop, so I can't use it for uploading or datalogging, still have to go with USB. However, with the Hondata app you can link up with your phone to watch all your sensor readings in real time.
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Old 02-10-2017, 05:17 AM   #16
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Default Re: 1991 CRX Turbo B18 project/build thread

badass I hope it work on an iphone too. mind sending me the info where u sent it to on a pm. I need to send mines Monday out to upgrade too
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Old 02-10-2017, 06:31 AM   #17
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badass I hope it work on an iphone too. mind sending me the info where u sent it to on a pm. I need to send mines Monday out to upgrade too
There's an upgrade form to fill out on their website, link below. And also I have an iphone and was able to use the app.

https://www.hondata.com/downloads/s3...grade_form.pdf

Last night I was able to plug it in and upload my tune, everything was good and green light was on. Car started but did not run well due to the cold temps, so I still need to make some adjustments on the tune.
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Old 02-10-2017, 06:37 AM   #18
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Default Re: 1991 CRX Turbo B18 project/build thread

sweet thx man an dnice
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Old 02-10-2017, 06:39 AM   #19
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Default Re: 1991 CRX Turbo B18 project/build thread

so I already have a boost controller and boost by gear so my option needed will be the 280 one or the 330 one for this

Reliability Upgrade – Install 8 high quality replacement capacitors to help protect and extend the life of your OBD1 ECU
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Old 02-10-2017, 07:51 AM   #20
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so I already have a boost controller and boost by gear so my option needed will be the 280 one or the 330 one for this

Reliability Upgrade Install 8 high quality replacement capacitors to help protect and extend the life of your OBD1 ECU
Yup. I went ahead with the reliability upgrade since my ECU is from 1994, and I really don't want to deal with any more issues in that department...
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Old 02-10-2017, 07:54 AM   #21
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Default Re: 1991 CRX Turbo B18 project/build thread

true lol
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Old 02-10-2017, 09:31 AM   #22
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dang nice!
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Old 02-10-2017, 11:48 AM   #23
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Default Re: 1991 CRX Turbo B18 project/build thread

CR-Z ftw. Good job on the fingernail trimming all the way down, thats the way to do it. People who don't cut their nails are gross females excluded to a certain length. The end.
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Old 02-14-2017, 06:13 AM   #24
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Default Re: 1991 CRX Turbo B18 project/build thread

Time for a quick update where I'm at with the car.

Over the weekend I was determined to work out the tuning issues and get the car running great. However, I found that it seemed my entire fuel map was too lean by around 40%, which couldn't possibly be right.

First thing I need to double check is that my calibrations weren't corrupted by the old faulty S300 when I downloaded them. So I am going to create a new base tune, compare the maps and see if it runs better on that.

More than likely, I am thinking there is a mechanical issue with the fuel system. I am going to cover everything, replacing the filter, possibly FPR, cleaning injectors and do a pressure test. I can hear the pump chugging away so I am doubting it's the problem, but will check it out if pressure is an issue.

If all else fails and it turns out my tune is bad, then I will need a re-tune which sucks. However, if I am going to get it tuned I was thinking why not swap out the GSR cams for a set of turbo cams while I'm at it, and maybe some other valve train upgrades

It's a slippery slope!

More to come this weekend.
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Old 02-18-2017, 04:58 PM   #25
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Default Re: 1991 CRX Turbo B18 project/build thread

Today did not turn out as I had hoped. I installed the new fuel filter, then attempted to hook up the fuel pressure tester kit I loaned from Autozone. Only to find that none of the adapters would hook up to my Benen fuel rail. Wtf.

It looks like my rail has 3/8npt ports and 1/4npt reducer on one end which is where I wanted to pull from. How could a universal tester not have 1/4npt?! Anyway, I took it back, and ordered myself a cheap one I found online that comes with 1/4npt adapters. So now it'll be next weekend before I can pressure test.

The filter did not solve my issue, nor did running a new base tune. So more than likely I am still looking at a mechanical issue vs a tuning issue. I also noted that when idling on all cyls, it pulls 18 inches of vacuum. So I doubt a vac leak is the problem. I'm leaning towards the FPR.

I noticed after the car was sitting for a while there was a hissing sound from the fuel filter and a little gas had leaked from the banjo bolt. Always have hated banjo bolts. Used 2 new washers but still leaking. Guess I need to clean all the mating surfaces and reassemble.

The only upside today was the 60 degree weather, and sun shine so I was able to snap a few pics. Til next week...




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