Austin99z28

So this summer i purchased a 1999 z28, i noticed it had a ton of aftermarket parts and i wanted to figure out everything it has, so i went to the place that did all the work to the car; i know who did it because the name was in a few places on the car. Anyways, the car has a fast lsx102mm intake manifold with rails and throttle body, k&n air filter, long tube headers, 3 inch stainless steel y-pipe with magnaflow and no cats, injectors(not sure of the size), hypertech computer, msd plugs wires, etc. the car was built up for a supercharger but wanted the power a different way, stupid choice but whatever. i was told by the shop that he went and had it dyno tuned and it had 200 hp. is that even possible?doesnt sound like it to me, at all.it has tons of power but they said it had too much air compared to fuel?i have no idea, could anyone tell me how much power you think im pushing? i would think around 375 or so? Thanks

garygnu

what pistons dose it have ?whats the cc of the head chamber ?what cam dose it have ?maybe do a compression test.if the car is running rich have it tuned correctly.do you have dyno sheets ?

Blownbayou

iTrader: (7)

200hp??? sounds like bs unless you are running pig rich and on 7 cyl.

see sig for my dyno and mods

Austin99z28

all stock internals.and i do not have dyno sheets, but it did sound like bs to me as well. at 35 the tires still spin easily.

DarkblueTA

Best bet is go run it at the track or have it dyno'd. 200rwhp. Please, they have gotta be joking.

Lee12609

iTrader: (3)

275-330rwhp without a descent tune and depending on dyno.

Austin99z28

@lee, the ls1 is claimed to have 325 stock.

RedRocketZ28

iTrader: (19)

Sounds like the shop has no clue what they are doing. Like mentioned, take it to the track or get it on a dyno.

canada4g63

Not even a stock ls1 puts down 200to the wheels, headers and the intake should have gave your 40-50whp, should be around upper 300's, does it have a cam?

StangBanger317

Somethings not right, Where's the sheet?

Lee12609

iTrader: (3)

yes at the flywheel, notice i said RWHP (that is rear wheel horsepower)

40-50whp from headers and a 102mm intake???? not even close.... even full bolt on 346ci cars struggle to make 350whp, he isnt full bolt on.

Sladester2

iTrader: (1)

yes at the flywheel, notice i said RWHP (that is rear wheel horsepower)


The 325 was claimed at the wheels actually.. not the flywheel. A stock auto ls1 rarely puts down only 275.

Lee12609

iTrader: (3)

no actually they were "rated" at 305 flywheel horsepower, and on average they dyno 275-300 wheel horsepower bone stock through an automatic. most people who post their dyno are the ones that think they made awesome stock numbers so you see the 300+whp stock dynos from time to time, doesnt mean thats what they make.

motor trend dyno'd these cars when they first came out, after break in period etc and made 268 wheel horsepower.

the 01+ made a little more power because of small changes but still are only around 285whp on a correctly calibrated dyno.


the OPs car should be making 325-340whp with a proper tune, i said 275-330 because he was told the tune was WAY off which could mean anything.

BirdsSince16

iTrader: (3)

Possible the MAF is dirty and not picking up all the air so it's running super lean? I had mine dyno'd at 305hp after a cam install and come to find out it was running like ~18:1 AFR because the engine was getting more air than it thought it was. Cleaned the MAF and dyno'd at 398.8hp with the clutch slipping at 5700rpm.