dafriezez28

Okay, so here's the deal... I don't own a GTO (as some of you know). I have a '94 LT1 Z, pretty much stock.

My friend is coming back from Afghanistan and we are both doing LT headers and planning on getting a tune at Speed Secrets. I guess what I'm wondering is what kind of gains have been seen on the LS2 w/ just long-tubes? My friend is convinced it won't do much b/c the dealer fed him this bullsh*t about how since the factory exhaust is tuned it won't show any gain.

Anyway, sorry for the ignorant question... but I am curious. And if anyone happens to know offhand how much HP an LT1 will gain, I'm not opposed to hearing that, either

EllisJuan

iTrader: (1)

Long tubes are one of the best mods you can do on and lsx motor. They love 'em.

GTO1_OHIO

iTrader: (3)

but he should get the car dyno tuned to get the most out of the LTs.

dafriezez28

I know he's going to get some power... and we are both getting our cars dyno-tuned after the install, but I mean... numbers wise, any clue what he'll gain? I mean, is it gonna be 15 WHP? 20 maybe?

05_GTO

If he is getting a tune 15-25RWHP would be a good guess. If not I would say 5-10. The LS2 works well with mods, but it seems a tune is needed to really get the most out of it...

860 Performance

iTrader: (1)

I know your asking about an LS2, but in this months HotRod mag, pg115 they installed Kooks headers on an LS1

10rwhp gain untuned
21rwhp gain after tuning

dafriezez28

Thanks, appreciated I would probably expect similar gains, no?

KrautBurner

iTrader: (5)

my gto should be at speed secrets this week (I hope)
getting Kooks Long tubes, cam, and nitrous installed.

I will let you know how it goes.


Russ

k1200lt

I picked up 23 more HP/TQ with a LF CAI & SLP headers. That's not from a baseline dyno, but from other folks OEM stats.

GoatBoy24

I have a question. Many say mods put out more HP after a tune. Now, does that mean a dyno tune, or will you get more gains also from a handheld tune, such as the Predator?

05_GTO

Every car varies, unless you did a baseline dyno on your own car you can not say what you gained.

Dyno tune is the only real way to go IMO.

ExTurbo

so you just picking numbers randomly then? how do you know your car isnt some kind of freak and you only gained 10hp from your intake and headers??

Chilly Palmer

LAME.

I would say 20 whp with headers after tune. Kinda sucks how bad the LS2's are dependent on a tune to compensate for every mod.

Steel Chicken

iTrader: (3)

sweet, ricer math.

offaxis

iTrader: (19)

My friend just picked up 16 rwhp on his 06 gto with his 1 7/8 ARH and hi flo cats before tune.

I had mine installed but I havent hit the dyno yet . Id think with the offroad pipes you would see 20+

k1200lt

No, meaning I never had the car dyno'd before I modded it. My 1st tune at was 367/367 with headers/CAI. But I have no idea what the pre-mod baseline was, only from what I read on other forums.

Dan00Hawk

My LS1 had a baseline of 292 rwhp and 318 rwtq on Speed Inc's dyno. Did CAI, plugs, wires, SW 1.75 LT headers with offroad pipes, and dynotune. New numbers were 331 rwhp and 339 rwtq. So increase of 39 rwhp and 21 rwtq on my LS1 through the stock catback...

Chilly Palmer

Let me break it down - Stock dyno numbers vary widely, so you cannot go off what someone else put down and apply it to your car. You cannot say how much hp you gained because you don't know how much you made before the mods, so for you to quote specific numbers like you did is absurd.

04JRB

I was at 320 rwhp and 330 rwtq with a cat back, CAI, UD pulley and a predator tune. With long tubes and high flow cats WITH a professional tune I was at 345 rwhp and 346 rwtq on a mustang dyno.