Dynoed my 1994 SLE L27 today. ---- RESULTS POSTED ------ - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-29-2007, 05:58 PM   #11
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So I had to dyno it at 2nd gear since we didn't have a way of stopping the vehicle from gearing down. All my numbers would be pushed over to the right, just in case you're wondering why I make peak torque at 2600 RPM.

The results are 122.8 HP @ 4500- 5000, as opposed to factory specs of 170HP @ 4800 RPM, thats about 28% loss from flywheel to front wheels.

Torque ratings are 190 ft-lbs @ 2600 rpm, which would be around 3200 RPM at higher gears. Thats 13.6% loss from flywheel to front wheels.

I wouldn't say I have a bad tranny either, I think its in great condition. But I was pretty disappointed at the HP ratings. Of course, everyone at work laughs at me, everybody else'* daily driver was pulling over 350WHP with over 300 ft- lbs of wheel torque. We have one newer GTI that pulls over 400WHP with race gas, and 350 ft-lbs. A customer that came in for a bigger intercooler yesterday took me for a test drive to see if he could blow a silicone boot. He was running 60PSI on twin turbos on his 1997 Dodge Ram with a 5.9L Cummins 12V I6 diesel, he ran at 545 WHP @2500 RPM with 1140 ft-lbs of torque. Fastest 1/4 mile was at 12.4s @ 104MPH, full interior, canopy, stuff in truck bed, etc. The lowest all time dyno was 13 HP from my coworkers little ATV and 26HP on his crotch rocket.

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Old 09-29-2007, 06:10 PM   #12
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Quote:
Originally Posted by 94SLEeper
The results are 122.8 HP @ 4500- 5000, as opposed to factory specs of 170HP @ 4800 RPM, thats about 28% loss from flywheel to rear wheels.

Torque ratings are 190 ft-lbs @ 2600 rpm, which would be around 3200 RPM at higher gears. Thats 13.6% loss from flywheel to rear wheels.
Umm..yah lost me. Whose rear wheels?
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Old 09-29-2007, 06:13 PM   #13
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haha, oops, front wheel!

When I was on the dyno, my friend had parked behind me in his very clean, very mint Eagle Talon TSi, painted in metalic blue. With my front wheels up and my dual exhausts pointed down, it blew this huge tornado of dust, rocks, and smoke all over this car with open hood and doors because he was just cleaning it and showing it off.
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Old 09-29-2007, 06:51 PM   #14
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oh...my...what the hell. the torque just like...FALLS OFF no wonder these have no top end! they..have..no top end! go figure! Thats pretty bad tho

Love the low end...boy, pulling from a light, these cars feel like they'll rocket past anything, but have nothing up top.
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Old 09-29-2007, 06:58 PM   #15
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Thats power at the wheels.... so what are you making at the crank?

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Old 09-29-2007, 06:58 PM   #16
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Yup, everytime we pass someone, the car gears down, uses all its low end torque to rip it up, but at top gear, high rpms, no more power! Unless we turbo it, we were thinking about it at work, running about 5psi, using the cross over under the TB, possibly running an intercooler as well, alot of guys were agreeing we could see a 50 - 60HP increase.
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Old 09-30-2007, 12:42 AM   #17
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ah, compound force induction, turbo on top of supercharger. that would make for a truly fast ride.


we played with it some on neons.org. . . . . . we found that to make it work without detonation you will have to use a pretty large turbo and a good intercooler to provide the sc with dense air, because unless you can disable the sc it will still try to compress the charge air. and even tho it will fail to do so to any measurable extent it will add heat to the air.

but the two neons that were built with compound induction were by far the fastest neon'* on the org. both posting 11 sec 1/4 and traps over 120 mph. and consider that a neon runs out of gearing at 147 mph at 6000.

the first neon had an sc basically welded to the intake from a ford 3.8 */c thunderbird and the turbo actually fed its charge air into the */c inlet. than from there to an srt4 intercooler than to the tb. simple and effective if not a tad crude, but it was fast, dumb fast. tire smoke through the first 4 gears

the second neon used a merge collector at the tb and a magentic clutch on the sc so it bypassed the charge heating issue. basically he used a electronic butterfly to switch charge air sources, sc under 3k and around 3.5k-4k the butterfly begin to switch over as the turbo spooled to take over for the top end rush. complex and full of bugs but when it worked oh it worked. this car also had the best power delivery of the two. still smoking tires through the first 4 but in a more controllable manner. also it retained power steering and a/c. something that couldnt be done on the first car.

if i recall i think audi and vw are using the second method of compound induction
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Old 09-30-2007, 12:45 AM   #18
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Neon, I think you're wandering around confused. His car isn't supercharged. Let'* try to stay on topic.
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Old 09-30-2007, 09:13 AM   #19
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Quote:
Originally Posted by 94SLEeper
Yup, everytime we pass someone, the car gears down, uses all its low end torque to rip it up, but at top gear, high rpms, no more power! Unless we turbo it, we were thinking about it at work, running about 5psi, using the cross over under the TB, possibly running an intercooler as well, alot of guys were agreeing we could see a 50 - 60HP increase.
Unlikely. S1 L67s came with at MOST 225 hp, and that is running with 8 psi. You *might* get a 25hp increase with 5 psi, if that. Intercooling is not necessary at that low level boost either. Once you start hitting 12 and above, that is when you will need it.

Take this advice from someone who actually has boosted an L27: Don't do it. Mine runs well...enough. Tuning is a pain in the arse as L27s are much more sensitive to knock than L67s are due to piston diffrerences. If you really want to turbo, get yourself a L67 short or long block (you can use the L27 heads if you get a shorty), and put the L27 topend on it.
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Old 09-30-2007, 10:44 AM   #20
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Quote:
Originally Posted by willwren
Neon, I think you're wandering around confused. His car isn't supercharged. Let'* try to stay on topic.

the compound induction was a suggestion, maybe you took it the wrong way.

couldn't wait to jump down somebody'* throat could ya
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