Last week we had a track day at Jacarepagua Ex. F1 Circuit (Rio de Janeiro - Brazil)
We did an open - catless 2 1/2" no catback - track exhaust for the car(just for track). Tuned it with 96 octane gas (brazilian gasoline has 25% of alcool). The result was 330 whp @ 9psi droping to 7psi @ 8000 RPM. I am using Unichip + extra 1500cc fuel injector before throttle body as fuel management.

The car is running smoth on street (almoust like the stock but with tons of more torque)... great for track, lots of power... enought to keep up against tuned WRX and Evo's. But the stock wheel/tires aren't handling the power. It's almoust impossible to push hard with the DSC off and don't spin.

The biggest problem was that the temp is going to high. I had to take a slow lap to cool down the car after pushing hard for 2 laps. It cools fast showing that the system is working fine, so it's obvious that i have to get a cooling system upgrade. Could someone help me, indicating a radiator, oil radiator, etc... whatever i need to help the car to cool down the extra hp's? Because i am in Brazil it's hard to lookout for those parts here. I would love if someone showme a link of a good store where i will find it.

I am getting to much back-fires on the car. even with the street exhaust (stock catback with catless 2 1/2" mid-pipe). I think it is the extra injector before throttle. Where can i get bigger fuel injectors (550 or 720cc or something like that) that i can replace the secundaries 360cc ? I would like to find bolt-on injectors. Any recomendations about that?

some pics of the car on track:
http://img350.imageshack.us/img350/8236/minurx8012ye.jpg
http://img287.imageshack.us/img287/5372/rx86dw.jpg

with my friends car's (red member's only ehehe):
http://img350.imageshack.us/img350/6185/minredcars011rb.jpg (http://imageshack.us)

Sorry I can't help with the cooling, but I do have a question about tires - Are you considering better tires to cope with the 330whp? With all the other mods you put in to get HP I'm surprised to didn't go for lighter rims and tires and looking for better traction too.

330whp - must have been an amazing ride at the track!

I have looked for a few Racing Compound Tire (Yokohama A048 or A032R or Toyo R888) but couldn't find any 18"... there were only 17"

I am still looking for options for better grip, i really need it, but today the bigger problem is the temp climbing to fast.

For handling i have RB sway bars and springs. And i did some camber/caster/align job.

look go to vividracing.com they got some cooling stuff there u can buy also if it dont get to cold there go to 100% water with a few cap fulls of redline water wetter instead of the standerd coolent

try contacting forum member Sapphonica, he swapped for drop-in 650cc secondary injectors

http://www.rx8club.com/showthread.php?t=78261

and the potential is there:

http://www.rx8club.com/showthread.php?t=47822

.

Last week we had a track day at Jacarepagua Ex. F1 Circuit (Rio de Janeiro - Brazil)
We did an open - catless 2 1/2" no catback - track exhaust for the car(just for track). Tuned it with 96 octane gas (brazilian gasoline has 25% of alcool). The result was 330 whp @ 9psi droping to 7psi @ 8000 RPM. I am using Unichip + extra 1500cc fuel injector before throttle body as fuel management.

The car is running smoth on street (almoust like the stock but with tons of more torque)... great for track, lots of power... enought to keep up against tuned WRX and Evo's. But the stock wheel/tires aren't handling the power. It's almoust impossible to push hard with the DSC off and don't spin.

The biggest problem was that the temp is going to high. I had to take a slow lap to cool down the car after pushing hard for 2 laps. It cools fast showing that the system is working fine, so it's obvious that i have to get a cooling system upgrade. Could someone help me, indicating a radiator, oil radiator, etc... whatever i need to help the car to cool down the extra hp's? Because i am in Brazil it's hard to lookout for those parts here. I would love if someone showme a link of a good store where i will find it.

I am getting to much back-fires on the car. even with the street exhaust (stock catback with catless 2 1/2" mid-pipe). I think it is the extra injector before throttle. Where can i get bigger fuel injectors (550 or 720cc or something like that) that i can replace the secundaries 360cc ? I would like to find bolt-on injectors. Any recomendations about that?

some pics of the car on track:
http://img350.imageshack.us/img350/8236/minurx8012ye.jpg
http://img287.imageshack.us/img287/5372/rx86dw.jpg

with my friends car's (red member's only ehehe):
http://img350.imageshack.us/img350/6185/minredcars011rb.jpg (http://imageshack.us)

You can find a good radiator for your car at fluidyne site . then prepate a good :) one for my 3 rotor RX8 with no overheating problems.

About for the tire i'll recomend to use a set of Toyo TR1S it have soft compound and result to me with 600+ RWHP. :)

u could try installing a vented hood before you do the radiator

I have the PWR upgraded radiator, silicon hoses, and have switched to synthetic oil, and also have the Royal Purple coolant treatment. They all helped a little bit, but engine/EGT still tend to heat up pretty fast. Next thing going in is an upgraded Greddy oil pan, it is supposed to increase capacity by another .5 quart & has some cooling fins. Probably not a big deal, but anything to help. Hopefully maybe find an upgraded oil cooler down the road.

Nice hp output.

So we all know that these kind of numbers are capable out of the GReddy turbo. Perhaps with that water/methanol injection kit, and the turboxs full exhaust system, some of us in the states can get to that level.

Here is a site that sells the radiator and hoses.

http://www.rx7store.net/category_s/119.htm

Have you thought of upgrading the electric fan to assist with cooling?

casue of the intercooler stealing some of the air away from the radiator, I would go with a larger core radiator, and a mix of more distilled water than antifreez, like 70/30 or something, maby with an addative like ice32, watter wetter, purple ice, ect.

I would also look at a different front end, something like the mazdaspeed that has larger inlets for the oil coolers as well as the radiator/intercooler.

Also being a brazil model, you should get the 2nd oil cooler, they tested it on best motoring (1 oil cooler vs 2) and found that it lowered temps on avg. 30* at track speeds, and 10-20* at normal city speeds.

Thanks for the replies, i am checking all those infos and i will let you know...

here is a video of the car on track. I was filming and a friend of mine (the owner of the WRX) was driving. First time he drove the car, he was driving kind of slow 10 sec slower per lap than i.

click here (http://www.zshare.net/video/td-2212-wmv.html)

nice donut :) Is it me or is your 8 really loud even with the turbo?

nice donut :) Is it me or is your 8 really loud even with the turbo?

The reason his car is loud is due to the...... "open - catless 2 1/2" no catback - track exhaust for the car(just for track). "
I'm suprised it wasn't louder with no cat and no catback. I've started my car before with the cat and exhaust off and it was insanely loud.

the car was insanely loud... but in high revs it's a littlebit better. the worst was between 3~5000RPM. On Track it won't go under 6000RPM. we were running with closed windows.

Boosted guys, what else you did to control de temp. of the car? I need more ideas!

Thanks

Water injection, or spray intercooler? Turn your heater on, you'll burn up but I think it will help reduce the temps?

I'm not that familiar with the Unichip, but if it does anything like what the emanage does to fool the stock ecu into open loop, via altering the water temp signal then whenever you go under boost it tells the computer the water is cold and so I believe the PCM turns off the radiator fans. Not a good thing when you are under boost for extended periods.

Change the radiator you cant run in boost for extended periods the stock radiator is just one inch row switch for 1 1/2" All Aluminum from CL racing radiators. i run my booster car in the highway at 10 psig of booost for extended period with no overheating problems.

your car really is loud..and wow you can hear it backfre..

wire the cooling fans to a relay and switch so you can turn them on..It makes a big difference. The cooling fans don't seem to run much in this car??

I don't know how fast he's driving, but radiator fans are usually only helpful at relatively low speeds.

More ideas (other than those that have already been mentioned)? Make holes in your bumper and hood.

True...but the car never gets a chance to cool down between runs.

Water injection, or spray intercooler? Turn your heater on, you'll burn up but I think it will help reduce the temps?

that does help when your not moving. at track speeds it doesnt make much of a difference.

on my miata, I had the 2 radator fans wired to run together (one is for the ac, one is for the radiator) when you wire them together they will both run, giving you twice the air flow. I also wired them to a switch so the car could control them, or I could.

bettween runs I would turn them on, pull the hood release (to give you that 1 inch of space and turn thr heater on full blast. It helps cool the car down quickly.

I've been debating about running a FMIC but still have the 8 run properly on the track. The cooling issues are such a concern with these engines. Maybe someone will need to release a V-mount type kit for our cars.

I've been debating about running a FMIC but still have the 8 run properly on the track. The cooling issues are such a concern with these engines. Maybe someone will need to release a V-mount type kit for our cars.


whats the difference in front mount and v mount it?

V mounts are at an angle so air can flow to both radiator and intercooler at the same time. Neither get a completely direct shot, but neither get neglected either.

I've been debating about running a FMIC but still have the 8 run properly on the track. The cooling issues are such a concern with these engines. Maybe someone will need to release a V-mount type kit for our cars.
The radiator is already angled but its angled the wrong way for a v-mount. If you angle it the other way it could work in a v-mount configuration and with the Greddy intercooler being rather small it souldnt be too hard to fit it. I would actually like to see a v-mount configuration on the 8. Sounds like a good project for you boosted guys. :D:

what do you run on the 1/4 mile with 330whp?

BrasilianRx8_2 I'm sadly not an owner of an RX8, but I stumbled accross this site in looking up information for a friend of mine (Whom I'm trying to persuade to buy an RX8!!!). I noticed your cooling issue, and I wanted to throw my .02 cents in. I'm no mechanic, but I tinker on my hobby car with the help of a friend that's big into speed :rock: I've got my Eclipse just over 500hp, and with some more aggressive cams, and a little more boost, I hope to touch 550hp this season. My car has a twin Eclipse, same color, trim, everything, that put down an 11.74 - 1/4 mile last year. So its my turn this season! Anyways, I tell you that to build my background. I only scanned through this thread, so if any of this is wrong, or a repeat of someone else, forgive me.

Some ideas I used on controlling my temperature:
Have you tried a full race gas to see what that does for your temps?
Have you looked into a water injection setup?
Have you checked the atmospheric temps under the hood after you get your temps up? I know a few people that saw a pretty nice drop in EGT's just by building a custom "ram-air intake" or "snorkel" from the front of the car to the air filter (and possibly the RX-8 is already built like this, I wish I knew :) ) So if your underhood temps are high, and your filter is just sucking that air in, up go your temps exponentially. Warmer air going into the motor = much warmer air going out, and a warmer engine. Which will in turn warm up the air even more and repeat the last part :) (I assume you already knew this though).

Race gas wasn't a lot of help on my temps, but it kept me from seeing knock, which let me pull out a little more fuel (I'm using DSMLink v2 (http://www.dsmlink.com) ).

However, I have a water injection setup I built to help me run 25+psi (my compression is a BIT lower than yours :) ). My EGTs saw a HUGE drop! I don't think I could run the FP3065 (http://linux.forcedperformance.net/merchant2/merchant.mv?Screen=PROD&Store_Code=FP&Product_Code=NTDSMFP3065&Category_Code=DSM-Turbo) without it. I am so much more efficient than a front mount I/C!
I built my own water injection setup for ~$200USD, and at that price, its worth a try!

I just bought a 2005 Ford Powerstroke and the first thing going in is the water injection kit! I'll keep those EGTs down when I'm pulling my Eclipse to the track and home :mdrmed: !

Let me know if you have any questions, I'll help as much as I possibly can! I hope something in this mess of half-asleep mutter is useful to you.

nice vid.. but need to work on ur cornering exits

I have this on my car :

http://www.designengineering.com/products.asp?m=sc&cid=1

Sprays C02 directly onto the intercooler cooling down the intake air. Also has a device where they have a metal bulb in the pathway that can be injected with C02 lowering the intake air even further.

Also this company has various wraps for the exhaust manifold & the turbo as well. This can reduce underhood temperatures