Thread: Ballparking power gains

Id be interested to hear also. we have similar builds. I have 1.8 Roller rockers and a beefed up Transmission and some other stuff. Once I get my next rounds of mods done I want to take it to a dyno just for ****s and giggles. I care more about street performance than anything.

3.4" with headers...

14* of timing.

Piggy AFR.

But to answer your question you probably didn't gain much horsepower at all...you might have gained 10-15 WTQ, but you lose it all because of the AFR, timing, and knock. So it's probably just as fast as a stock car.

How rich?

I got away with 14º of timing on 11.0 AFR with no knock. Better than the stock 10.7 AFR with 3-5º of knock on stock pulley with factory manifolds. 20-25hp gain is my guess and that's just a guess. So many factors can into play and every engine is slightly different.

his afr aint piggy, its maf tuned, 14 is all it would take with a 3.4 and gen 5.

theres no other mods, just headers & 3.4. 3.6 would be better im sure.

i did.

If 14* is all it would take, with less than stock AFR, then it needs a larger pulley.

Like I said, I'm sure it's no faster than a stock car.

But what if it isn't richer than stock AFR??

Because going richer than 10.5 to 10.8 would be wasted power.

Charts for reference on a stock GTP file.

both those files have been re done as well

Originally Posted by blueguy

If 14* is all it would take, with less than stock AFR, then it needs a larger pulley.

Like I said, I'm sure it's no faster than a stock car.

I don't understand your logic here. I've driven stock GTP and GTP with mods like his and mine, and ours is way faster than stock.

More timing and less boost is going to give you more power than less timing and more boost.

20-22* is "standard" from the tunes I've seen.

Don't chase the KR monster away on 04+. About 2* KR is normal. Something about a change in sensors from what I recall.

20 to 22 is not the norm at all. 18 ish is, 21 if you are on e85 or flowing with a cam and ported heads and crap.

Originally Posted by SgtMarshal

is this seat of the pants faster or has the car been on the track or dyno?

Both with enough timing and the right size pulley.

Originally Posted by SgtMarshal

I don't understand why you are responding to that question.

Because it's an easy question to answer. I'm sure at least 51% of the forum could answer it correctly, and that's saying a lot.

Let's take a quick look at rickisrad's setup:
2004 Comp G. Pacesetter headers, 1.8 roller rockers, Wizair CAI, Overkill'd, 3.4 pulley, ZZP transmission, fuel pump and alt rewire, poly mounts/performance suspension, Impala front brakes drilled and slotted rotors. blah blah blah

If you think that should be the same feel or quickness as a stock GTP, I don't know what to tell you.

Maybe everybody who has been putting money into modding has been throwing their money away (more than we know)...

i had that same set up but 1.95 rockers on a gen 3 blower. the 3.4 wakes it up. it cant be more then 20 hp tho. going from stock to lightly modded and no kr also wakes the car up a lot.

gen 5 is a better blower so a 3.4 is really to much with out rockers or a cam to help it flow better, why his timing is dropped.

That's why he should pulley up. 3.6 would be better suited for his current mod list.

A 3.6 on a Gen V is roughly equivelant to a 3.4 on a Gen 3.

Originally Posted by Explicit_Spade

That's why he should pulley up. 3.6 would be better suited for his current mod list.

A 3.6 on a Gen V is roughly equivelant to a 3.4 on a Gen 3.

exactly. but he showed up with a 3.4 to put on.