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HP gains on 3L w/ tune

S

S2Knott

Hard-core CEG'er
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Jan 29, 2005
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so im going to be getting a 3L swap done by Greg Breton.

i am getting a SCT tune, and it will also have a test pipe, magnaflow res, with no mufflers.

with that setup what kind of gains am i looking at over stock?

also, will have a aftermarket clutch.
 
Stock exhaust with a MAF + K&N setup net about 70-80 HP & TQ down low - pick up a little bit on the top end. Removing the main cat yields another 8-10 hp. You should be in the 185 - 200 range.
We had 4 SVT 3L swaps dyno'd, every car put down the same #'s within 10hp. The one car without a main cat put down ~10 more hp.
 
KyleQ said:
Stock exhaust with a MAF + K&N setup net about 70-80 HP & TQ down low - pick up a little bit on the top end. Removing the main cat yields another 8-10 hp. You should be in the 185 - 200 range.
We had 4 SVT 3L swaps dyno'd, every car put down the same #'s within 10hp. The one car without a main cat put down ~10 more hp.
Click to expand...

Not to start the same thread, but wasn't there a discrepancy with the +10hp main cat removal? Like the 10hp was between two different cars and not the same car back to back? I don't remember if there was any conclusion to that thread...
 
hotdimmes said:
Not to start the same thread, but wasn't there a discrepancy with the +10hp main cat removal? Like the 10hp was between two different cars and not the same car back to back? I don't remember if there was any conclusion to that thread...
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Well, being that after 3 cars on the runner put down almost the identical #'s, the only variable with the 4th was the modified exhaust system. Logically it makes sence that the car with the modified exhaust system is the car putting down more HP. I know different cars put down different numbers, but it seemed pretty clear that any modifications to the exhaust yielded better performance - Why are you arguing about proven #'s? It isn't rocket science that these cars pick up lots of HP by bettering the exhaust systems..
 
KyleQ said:
Well, being that after 3 cars on the runner put down almost the identical #'s, the only variable with the 4th was the modified exhaust system. Logically it makes sence that the car with the modified exhaust system is the car putting down more HP. I know different cars put down different numbers, but it seemed pretty clear that any modifications to the exhaust yielded better performance - Why are you arguing about proven #'s? It isn't rocket science that these cars pick up lots of HP by bettering the exhaust systems..
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I certainly wouldn't say it's PROVEN. If these cars are showing a horsepower swing of 10, what's to say the last one didn't have maybe 5 more hp than the highest one of the previous batch with it's stock main cat? Since there was no back to back dyno, you proved nothing at all. So I think claiming 10hp from replacing the main cat with a test pipe without such evidence seems a bit silly. Obviously the main cat impedes airflow, but to claim hard numbers...
 
I didn't claim hard numbers, I said the car without the resonator showed ~10 more hp on the Dyno - the tilde meant about, not hard, just what we saw.
 
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close to 200?

there have been many over 200 whp

blackcoog's 3L oval port (SVT intake manifolds) modded N/A 225 WHP
Warmonger's Hybrid (i think it was the first ever) 217 WHP
Y2KSVT's 3L hybrid (no head work!) 206 WHP

there are many more. 180-200 is the common range, without mods. i consider an unmodded 3L swap to be a FULL 3L swap, without the SVT components.

either way.... i'd bet the full exhaust system i have which has no cats or resonators, and only one muffler (2.5" mandrel bent) with headers, y pipe, test pipe, and all that.... gives 5-7 HP over a stock exhaust. comparing different engines doesnt work, some put down 10-15 more HP over others just because of how they have been treated, mileage, etc.
 
TRicker said:
close to 200?

there have been many over 200 whp
Click to expand...


He is minus one cat and has no mufflers, thats not what I consider major modifications.

Straight 3L he could expect around 185 give or take. With an oval port or hybrid setup closer to 200 as I stated earlier :p


It's still a good idea to get a tune down the road so start saving ;)
 
I used to have many dealings with a custom exhaust shop which did do back to back dyno tests with and w/out cats. He told me that (at least on similiar displacement motors) the HP gains w/out a cat were never more than single digit. Now I never saw proof but he had no reason to lie as he wasn't selling anything and I got all the cheap or free exhaust parts I possibly needed.

We have emission testing here so there's really no point. Then there's the enviromental damage, smog, etc.
 
changed my whole plan around.

i ordered headers yesterday and i am hopefully selling or sending back the test pipe because i believe there would be alot of rasp with it. and im not sure if i will straight pipe it again because of the rasp, ive got the mufflers disconnected and i can reconnect them if i want, im going to see how they sound with headers then ill keep you guys updated. still gotta figure out what clutch/flywheel combo to go with.... them the build begins.
 
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