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Any tuners out there?(14 posts)

Any tuners out there?Leisure
Aug 29, 2002 1:31 AM
My little brother recently installed a turbocharger on his 1.6L DOHC Geo Storm. Sounds funny right? But it's freakin' badass! Because of the high compression he's only running it at 7 psi of boost. I'd guess he's got it up to about 180 horses, nothing to scoff at except that he probably makes almost the same number of ft/lbs in torque and his car only weighs 2500 pounds! A few days ago he stomped all over a non-turbo 300ZX. So I'm in trouble.

My Integra GSR has a 1.8L VTEC engine with a lightweight flywheel, cold-air intake, and racing intake manifold. Going by the dynocharts, the latter two conservatively should have me at 200 HP. The flywheel reduces effective vehicle mass by 430 pounds in 1st gear, 350 in second, 270 in third, etc, etc. If my reckoning is right it's like having 230 HP in the first two gears. However, it's not a torquey type of power, effectively maybe 150 ft/lbs or so that comes on high, and my car weighs about 200 pounds more than his. He wants to race me Friday night at the street legals and if I'm not out of town by then I'll probably oblige.

Just had to share. The numbers look about right for where our two cars seem to be when we're driving them, and I do expect to win, but that's not really what's important. It's about what he's managed to do with the car he has. Nobody without advance knowledge would ever think a silly Geo Storm could ever contend with any other tuned import, especially mine which can already hold it's own with a V8 Mustang. And he has plenty more plans on the way. I really anticipate seeing how fast his car will be against mine.
No, but maybe you can answer a question for me.........firstrax
Aug 29, 2002 4:35 AM
Did anyone call nitros "NAAAAS" before the movie?
Came from the company "NOS", popular nitrous company. nmLeisure
Aug 29, 2002 4:52 AM
Go to 6000 and drop the clutch...retro
Aug 29, 2002 8:29 AM
Doesn't your torque come in about 4500? The light flywheel hurts you off the line, too--if you don't have it wound up, it's going to bog. But if you DO wind it up, you'll unload the front tires and away he goes.
IMO, you're doing the wrong kind of racing for the way your car's set up. Get him on a road course. Or go for durability--with a turbo on a Geo, he's going to be walking by Thanksgiving.
Your advice is good...Leisure
Aug 30, 2002 5:09 AM
But admittedly I don't expect either of us will be abusing our cars too hard. We'll probably both soft-launch the cars first and then see if we feel like pushing to uglier launches in further runs. The system at Rocky Mountain Raceway is pay to race then go as many time as you want/can. I've done enough launching to know what'll work, and you're right, my setup is more for moving acceleration, but I think that the high-winding nature of the engine and the fact that it does after all make much more power when it comes on high will make up for the slower start.

I'll tell you the funny thing about the Geo that you'd never expect (well, we sure didn't when he first got the blasted thing). It's made by Isuzu, and as you can guess Isuzu had their own versions of the car in Japan with stock turbos and Lotus-tuned suspension. That's right! Lotus purchased the same chassis and turbo engine to use in the Lotus Elan. They tuned the suspension themselves, and then Iszu proceeded to use it on their own cars. Since the engine is built by Isuzu (and not Chevy), 7 psi is actually fairly mild boost, so my brother's not worried about reliability. The total package is what's fun. He's already gotten the Lotus suspension stuff put on his car with aftermarket springs and shocks. It drives wonderfully and I figure we'll trade cars for a week just so I can have fun with it - safely and legally of course.

And of course he's not stopping there. The top level stock Isuzu engine is horribly overbuilt, not unlike Nissan's SR20. Some "pro" racers have gotten that thing running quarter miles under 11 seconds across several seasons on stock rods and pistons without incident. So my brother's planning on doing another engine swap and tuning it up as high as 300 horses, and because he's getting advice from guys in the know (who have been running 500+ horses at the wheels), he can still expect the thing to be highly reliable. Freakin' scary. The results I've seen already make me want to get a turbo, but to do it reliably I'll have a lot more to rebuild in my engine.
I'm always befuddled by "import tuners" . . .jefajones
Aug 29, 2002 5:33 PM
even though I just sold an 11 second talon :). Seriously though, I hope you don't have your car riced out - or the metro. It is really hard to launch a FWD Vtec, due to the torque curve (or lack thereof)which is why the S2000 is pretty slow in the quarter mile given its horsepower/weight ratio. The geo can probably launch at a lower rpm, even with greater torque, since most smaller turbo's are pulling max boost at 2,000-3,000 rpm. I hope the geo has fuel system upgrades or it will probably not be longed for this world. I'm also sure he is running some sort of boost control and planning to run race gas at the track . . . maybe making it worse yet . . . since you really have just a few very minor bolt on's. Your best bet is going to be running him from a roll on the street (not that I'd advocate street racing), where the vtec tends to do a little better.
My De-tuner.firstrax
Aug 30, 2002 6:49 AM
2000 Ford Interceptor. Complete with Decatur Genesis II Ka band radar, Gemini surveillance system, and corner strobes. Theres no faster way to get where your going.
Added bonus; free coffee, free parking and free tolls.
just don't get rear-ended nmDougSloan
Aug 30, 2002 7:09 AM
Eh?Eager Beagle
Aug 30, 2002 7:25 AM
In what sense "no faster way" exactly????????
Aug 30, 2002 8:24 AM
because people tend to give me a lane all to myself on the highway.

As for track speed, it's nothing special unless you do the Heater (pursuit vehicle) conversion.
I'd have to agree . . .jefajones
Aug 30, 2002 8:35 AM
that an anemic 4.6L in a 4,000+ lb land barge is indeed de-tuned. (sorry, couldn't resist :))
Whats sad is...firstrax
Aug 30, 2002 9:20 AM
there only getting worse. I also have a 2002 Impala 9C3. It was great for the first 15,000 miles. But performance declines rapidly after that.
I know some places were keeping thejefajones
Aug 30, 2002 12:11 PM
mid 90's imp.'s with the LT1 engines longer than normal, instead of switching over due to the power.

I used to own a BC4 camaro at one time also. A few of those car made it to the public without seeing duty . . .
I know some places were keeping thefirstrax
Aug 30, 2002 12:51 PM
The LT1 impalas were the best police cars since the early plymouth fury's. Fast, reliable and cheap to rebuild.
Interesting data:

LT1 Impalas ($24,000) averaged 4 years on patrol service, 5k in drivetrain rebuilding every two years after that.

Crown Vics ($20,000)average 18 months, too expensive to consider rebuild. Usually end up directing traffic after that.

2000-2002 Impalas ($18,000) looks like there only holding up for 12 months. Rebuild not even an option.