what the hell is wrong w/ my car (dyno ?)

[WutARyd]

okay, so here's my graph
http://members.aol.com/cjoshbang/images/dyno1.jpg

now these runs were with the injen cai, trd exhaust, and the afc hooked up. i, for obvious reasons, had the afc tuned for all motor rather than the nitrous. so what's up w/ my car? where could my ten horsepower be going? I couldn't have lost 8-10 hp because it was 90 degrees outside, could I have? I was just comparing apples to apples with some of the other runs on the site, suggesting I should be making more power. It seriously sucks knowing that I could potentially have gremlins somewhere!

edit: this was with stock wheels, and does anybody see anything wrong w/ the a/f ratio?

[The Game]

Doest at stock GT-S put down 145-150 at teh wheels, 165.5 sounds right to me with your mods.

[kabal57]

nah stock gts should put anywhere from 160 to 165 if im not mistaken. Something aint quite right with your graph dude :(
ive seen dynos of gts w i/e put down about 170-175 whp.

[GT-S Celica]

yup, something is not right...

[GTS LAID]

i'll be willing to bet the stock ECU changed back the fuel trim when it noticed from the o2 sensors that something wasnt right... you can do all the fudging you want with the AFC but until you can actually fool the ECU its gonna try to pull back on fuel...

by the way thats not a good thing cause it means you're probably also running higher temperatures with a lean mix like that.

[X-EVIL-X]

a stock gts will put down 150-155 to the wheels.
only certain cars get 175 to the wheels.
if you look at a rsx-s dyno they get 172 to the wheels which is 200hp so a stock gts will get 150-155.

[scapamouche]

Remember, every dyno is different. Even different units of the same model will differ over a percent or two. Figure 2% range of error, then you can expect to see on the order of 4-5 hp difference just due to error alone, much less if your engine is slightly less powerful (1-3 hp there, maybe) and it all adds up.

I wouldn't be TOO worried about it. The temperature also makes about 1% for evey 10 degress difference, so there's another HP or two.

Essentially, there are too many variables at work here to say something's definitely wrong with your car. Mileage can be a factor, too...

[Griffin]

Originally posted by WutARyd
okay, so here's my graph
now these runs were with the injen cai, trd exhaust, and the afc hooked up. i, for obvious reasons, had the afc tuned for all motor rather than the nitrous. so what's up w/ my car? where could my ten horsepower be going? I couldn't have lost 8-10 hp because it was 90 degrees outside, could I have? I was just comparing apples to apples with some of the other runs on the site, suggesting I should be making more power. It seriously sucks knowing that I could potentially have gremlins somewhere!

edit: this was with stock wheels, and does anybody see anything wrong w/ the a/f ratio?

Just looking at the air fuel ratio and whatnot it is pretty lean.... I almost wonder if maybe you don't have the mixture cranked a little too low and/or a coated MAF element... It's always been my impression that like between 10:1 and 12:1 is probably close to ideal for a gas powered engine from a POWER standpoint (14.7:1 is an emissions ratio)...

That having been said - I'd say unless you have dynoed on this exact same dyno before and you have now seen a significant decrease don't worry about it. Different dynos are going to give some very different results. - Hell even multiple runs on teh same dynow will have variations. The most important thing to do when tuning is to stick with the same dyno and do what you can to increase performance with regards to your original baseline. The total HP/Torque numbers the dyno puts out are kind of irrelevant. The 1/4 mile time will tell the story with no bias...

Griffin

[Kinezo]

is that a 4th gear run?

i got similar numbers, SAE corrected but on snow tires and an apparently soaked filter (there was snow caked on the control arms etc etc :)