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Discussion Starter · #1 ·
Ok my car is a bit slow...Wires, sparkplugs , air filter are new. The ignition are good too. But she's a bit slow at acceleration(engine run good, no prob, no hesitation, nottin), idea ? I know its only a 3.1, i know that it's not a 3.1 turbo but my olds ciera seems to be a bit powerful :eek: :eek:
 

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The more exhaust mods the better :wink: Just a hi flowing muffler has shown to give 10hp, and 10 lbs of torque at the wheel. Add a cat back to that, and you will notice it.A hi flow cat is also a good idea, and as stated a WAI, or a CAI is also good for some power, as is a larger throttle body. I can't think of any other bolt ons.

If you want some serious power, you will have to do internal mods, and a top end swap.
 

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sunbirdgt93 said:
My mecanic said that the 2.8 is a little more "agressive"(cause of a shorter stroke) than 3.1...?! :roll:
I think that it pulls a little longer, but not much. It feels like a 4 cylinder as far as power delivery, as it seems to come to life at about 3000 rpm, and pulls strong to about 5000 rpm to 5500 rpm. The 3.1 pulls harder though, and right from idle on, but seems to run out of wind sooner.
Actually, the only reason for this is because both the 2.8 and the 3.1 share the same intake and heads, but the 3.1 needs more air flow at high rpm than the 2.8L.

No one has really proved if the 2.8L's short stroke is an advantage or not to my knowledge.....yet 8)
 

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vegeta said:
id like to see the dyno of before and after with the mufflers.
Those numbers came from a member of this site a while ago. I believe it was a Flowmaster Muffler. His 2.8 made 10 hp, and 10 lbs of torque more than it did stock :wink:
The muffler was the only up grade that had been performed.

The 2.8 made 111.5 whp @ 137.6 ft/lbs with the Flowmaster muffler
The car in question had an auto tranny, which uses 33 lbs of torque to drive.
Using this math, we get the following
137.6 + 33 = 170.6 Lbs of torque at the flywheel.
111.5 whp @ 4500 rpm = 130 Wtqe @ 4500 rpm + 33 = 163tqe @ 4500 x 4500\5252 = 139.66 hp @ 4500 rpm at the flywheel :D

So, thats 140 hp. and 170 lb-ft tqe at the flywheel, which is 10 hp and 10 tqe more that stock.
 

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Well, a stock 2.8 auto makes 102 whp, and 127 wtqe. His 2.8 auto made 111.5 whp, and 137.6 wtqe :D You do the math :wink:
 
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