A lot of the events in our region are held at an airport and I found my self a bit underpowered. Searching for the best bang for the buck over the winter break I came up with a JRSC for ~900.
I will be installing a JRSC on my SM 99 Hatch this year, wondering if anyone else is running one and if they are doing anything to compensate for the additional heat? Only looking to run 6-8PSI with a Vtec supercharger on a B20 by way of some small flange mods.

I absolutely understand I am going to be doing some battling with the temperatures on longer courses, looking for tips.

Effective water/meth injection setups?

Larger alum radiator vs Del sol dual core?

I know it ghetto but I assume running hood spacers will vent some heat.

LHT is out of the question this year, if ever.

This is my "fun" car, lets face it racing for $4 trophies better be fun.

 

there is some super mega thread about this on the forced induction forum

 

Yes, I post there as well. Just looking for specific information insight that applies to this forum.

 

There was some talk about methanol eating away at the rotor coating, so if you were going for injection I'd use straight water only.

Big radiator will help, but only so much. It doesn't do anything to cool your intake temps, which are the real problem with a JRSC. Same with hood spacers and to some degree hood vents.

Getting your intake piping away from the engine and heat-wrapped would be helpful. Getting tuned on E85 might also be helpful (if its available where you live and if it was friendly with the rotor coating), as that will allow the engine to run cooler.

Unfortunately for you, I know people who even with the LHT business were getting things pretty hot on track. I don't know for sure that it will translate the same to even a long autox course, but it is not promising, and swayed me away from it years ago.

 

Powerneedy on here road raced his old integra jrsc and auto-X, although he was running the lht kit for intake temps, he was using a stock integra radiator for cooling the motor. I know he said during time attack he, just like everyone else, would have to take cool down time after so many laps but I don't think he ever had any issues at the auto-x course. My set up for this year is a lht jrsc gsr I plan to run the stock radiator this year. If water temps are an issue for you your best bet, I think, will be to run a full size radiator. As long as your not running too much boost the intake temps should be okay. That thread in the forced induction section has a ton of info on what boost levels work well without the after-cooler and what the limit is before you need to run some type of cooling for intake temps.
Has anyone logged an air temp change on E85??? I guess I never thought of that as a way to lower intake temps more info on that could be helpful if anyone has it thanks.

 

I do have E85 available and really considered running it, I am not sure how it would lower intake temperatures in any measurable way. Due to the injector firing the E85 being so close to the valve already.

 

E85 burns cooler, period. Hence part of why it is so desirable in turbo applications. I might be mistaken in how beneficial it would be in this application, but it makes sense to me.

 

Honestly you could put together a small turbo kit for about the same price, probably make more hp and not have temp issues autocrossing. I've driven a 2L turbo ek coupe with a smallish turbo and its pritty fun.

 

I agree, but you know the throttle response of a JSRC is hard to turn down Especially for $900.

OP, my $.02:
You definitely need to get your intake as far away from the motor as possible to get as cool of a charge as possible. Heat wrapping the header, doing the ghetto hood lift, or even getting some dryer tubing to route cold air into the engine bay might help.

 

^^^ the torque and throttle response is crazy on a well setup jrsc/lht... and i know only a hand full of people have this setup and only a few have first hand experience... My gsr was just flat out mean in sm. most people have a hard time accepting that a s/c setup can be good. But i dont know a ff honda beating/chasing down ssm fr corvettes in times i guess isnt good enough to some lol

 

Without getting too off-topic, I'd say it's because most people listen to hearsay and comments from other people without doing their own research.

That and (borrowing my friend's theory here) most drivers don't have good enough throttle-control to use a JSRC well.

 

That's what RaceLogic is for!

 

lol good point

 

I cobuilt/codrove a JRSC'ed B18C SM EG hatch a few years ago.

If you're just talking about autocross, I wouldn't worry about the heat. open the hood between runs and you'll be fine.

For any longer track event I *would* be worrying about the heat, especially if overdriving the JRSC past the normal 6-7psi. The LHT setup would be great of course, but at least an upgraded dual core full size radiator and Hondata insulating IM gasket couldn't hurt. Some temperature sensor (intake air temp?) would be nice. I would look into a hood scoop/vent or aftermarket vented hood if one could be made to actually get rid of some hot air; most are for show of course. Isn't meth injection illegal for SCCA autox?


Beyond the heat stuff, my $.02:

-Get the engine tuned well. Our setup was halfassed and had some part-throttle sluggishness sometimes which would throw off the balance of the car. You want the power and response to be as smooth as possible, and you'll need good throttle control to use it well.

-Bring extra belts. Some JRSC setups eat belts if they aren't aligned and tensioned well, especially if overdriven (we ran the B20 crank pulley for 9-10psi). I definitely lost a few runs when they broke in the middle of an event or 2.

-Good tires. You'll obviously need good fronts (we ran 275/35-15 A6's) to use all that insta-wheelspin torque, but rear grip on a lightweight powerful Honda is critical. We wasted the whole season on used up dead A6's in the rear and it was hard to keep the backend behind us.

good ruck!

 

Thanks a lot tronic!

Many great points

 

Did you ever have bad wheel spin with the 275's? Those seem like big tires.

 

I am using the JRSC and LHT intercooler on my GSR engine and it runs on E85. I have an industrial temp gauge in the fourth runner measuring 10 times a second. And the highest temperature I had when I run the autox is 158F but I tend to be around 130f. It is professionally tuned and I have 310hp and 309tq at the crank shaft.

 

Bagen, just to clarify, you're talking intake temps, right?

 

Yes, it was wheelspin on demand most of the time.

Our setup was making around 210hp/160tq to the wheels, 8400ish rev limit, extra short gearing of the earlier JDM ITR trans with the later 4.78 final drive. I wouldn't do such short gearing again, though; I think the GSR gearing would be perfect for an SM car with 23" OD tires.

Here's an in-car vid:
http://www.youtube.com/watch?v=QJ0G-ProQ94

 

glad to hear you found one. Sorry about not getting back to you.

I havent decided what to do yet with mine. I want to start auto-xing too. Are you going to the hersey event march 27, 28?

 

Yes I am talking intake temps.

 

I know your just wanting to have more power, but IIRC you are still on street tires no?

If its times your after, I think your times will drop a lot more on race rubber than more power.

 

Absoultely the answer here.

I am aware that you are pretty set on doing an SC, however, I had logs from cars that I had tuned a while back that had unbelieveable intake temps. (high). Be careful with water injection kits as well you can get brown rust looking debris on the plugs very easily and you may find that the cylinders are all getting different mixes of the water (trouble). I usually try and talk people out of water injection kits just because your masking an issue with them, not usually fixing a problem (high intake temps).

Intercooled turbo cars are usually a better deal. However, the LHT kit is a nice way to do the SC, I wouldn't likely use one with out it.

Just my .02

 

Also what trans is on the B20?

 

Yeah, Unfortunately I am on street rubber.

B16 trans with a 4.78fd, going to give me a lot of trouble with the supercharger.

My problem is when I'm on the off season I'm getting antsy looking for ways to improve my times. And if I can't actually drive the car I wanna make it "better".

I like a lot of guys get stuck in the mind set that more power is better when that is clearly not the case in most circumstances.

Last year I found myself riding the revlimit quite a bit to keep me from shifting, I was hoping to be able to run a higher gear with the sc and help out a bit.

I have another vtec motor in the works but as always it will not be ready in time and the sc seemed like the quick easy fix.