Hey Honda-tech,

Little run down of my set up

LsVtec rebuild, 20mins of run time on motor since initial start up/ mainly idle

b18a1 bottom block
Wiseco 9:1 pistons
Eagle H Beam Rods
Acl Race Bearings
all ARP internal bolts

Head
Gsr P-72
Brian Crower Valve Train,
new valves, guides, and seals
CTR Cams, MFactory Cam Gears
Skunk2 Intake Manifold
LS Throttle body

Turbo
BRMS ram horn
Garrett M24 .57 trim turbo
2"hot 2.5" cold charge pipes
HKS Bov
Tial 38mm Wastegate(v-band)
MAC Boost controller

Tuning system
Hondata S300 V2 with Boost by Gear

So my question is im getting this idle surge that ranges anywhere from 1500-2500, i haave bypassed my FITV thinking that it could be the cause, but no luck. still does the same thing. I'm dyno tuning on friday and just want to make sure the motor is all good. The current tune on my ecu that i used to start the motor up with was a JDM B16A with the same turbo set-up as listed above.

Also attached is a video, please let me know what you think or if you need more videos or pictures. Thanks!

 

Is your IACV clean of debris on the screen>? ALSO i had this same issue with my lsvtec setup... I spent hours chasing it down... did a compression check and cylinder three was low ... ended up having a cracked ring when I pulled it out.... probably from running too rich......

I tried the IACV, I tried the TPS, TEMP SENSOR, checked vacuum.... everything.....

then the dreaded compression test told me dirty secrets..........

 

compression is good. i checked that after initial start, but i can go retest it. also the IACV is clean, and it is functional. unless after 4 days of sitting it went bad but im sure it didnt.

could any of this have to due with my tune?

 

every motor is different. If you have two of the same builds next to eachother, I have seen them tune differently... so YES it could be tune, however Im not a Tuner so I cant really pinpoint what it could be other than the % increase in the IACV through the tune....

 

no worries brother, i appreciate the insight though




anyone else have any ideas?

 

What about the coolant level? although it usually only does it when it's pretty low maybe has air in the system.

 

It's Wiseco...

 

Sounds just like FITV tho...weird.
Rebuild? This wasn't happening before rebuild I'm assuming...so that's a clue.
Please don't abandon the thread, come back with the fix.

 

coolants bled good?
have you put your finger on the iac and fitv port in the throttle body?
you can place your hand on the turbo inlet to see if it dies
base timing set?
is the iac adjusted in the idle parameters?

 

lol thanks for the correction

no worries i wont, ive blocked/by-passed the FITV and i just bypassed the IACV as well. with the car running i put both fingers over the iacv and fitv(at separate times) and it seemed to bring the idle down. for some odd reason is it the throttle body gasket? i know the TB's are very similar, but maybe the TB gaskets are slightly different? its a skunk2 gsr intake mani with a ls throttle body, i see no issues but maybe im missing something

yes i did both of those already, with the car running i put both fingers over the iacv and fitv(at separate times) and it seemed to bring the idle down. for some odd reason is it the throttle body gasket? im sure there is some kind of vac leak somewhere, but i sprayed some carb cleaner around the areas a listened for a change in idle and i did not hear anything. thats why im wondering about the TB gaskets, everything was exactly the way it was on the old motor. im not sure why it would start acting up but just swaping them over.

 

i just did some reading. i have a b16 throttle body gasket im going to switch out real quick

this is what i found: throttle body gasket??

 

Well the TB gaskets are different, but it seems im using the correct one i need. i have a ls throttle body an using a ls gasket.

 

Any ideas? I'm fresh out

 

injector orings, intake manifold gasket, oil breather box good?

 

the gasket is brand new, intake mani brand new, the surface where it mounts was clean

breather box is good but maybe the PCV valve or hose is bad? ill check that when im off work

also the injector O-rings looked great when I mounted them, but it is possible they did not seat right when installed or possibly tore.

those are some good points brother, I appreciate the input

 

did you try scaling the iac in the idle parameters.


if you certain you have a leak, try and source down a smoke machine. or an easier vacuum leak route, smoke a cigarette "OR SO", close to suspected areas.

 

Well i found my issue. sure enough it was a vacuum leak. the B18B1 throttle body has obviously a smaller port than the intake manifold port, the stock B18B1 gasket does not fully seat when mocked up to the intake manifold. i went to napa and bought a roll of gasket paper and decided to cut my own for this application. below are the photos and description of what i did to fix this issue

In this image you can see the stock TB gasket gap and how the larger port on the intake manifold reveals the vac leak spot, i pointed to it with a flat head screwdriver, its about
mm gap i would say


Here you can see the new gasket i made. notice where the pens are pointing i made those gasket walls just a little thicker, about 2-3mm bigger

 

So re-assembled and all's good?

 

Yes sir! all is good. i still kept my FITV bypassed but decided to hook up my IACV again. no more leaks and a good solid idle.

Tomorrow i will be dyno tuning the motor with J Mills tuning in Franklinton NC about 3 hours away. Gonna load the civic into the trailer tonight. I've tuned with him before and he seems like a pretty good tuner. the local shop to me is Majestic Motorsports, but they are known to rip off a lot of the Marines around this area and lately the quality there has gone down unfortunately . i really want somewhere in the 400-450whp range, thats how i pieced together the motor, for that range. a fun street car. anyone see any issues with my set-up that i over looked? the clutch is a stage 4 from clutch masters

 

I was just about to say check the TB gasket lol

Just tune the engine and see what she makes.