So here I am about to bring the car to the garage to do alot of work on it when I decide to take it to the dyno to get some baseline #'s after the UDP install. So my first numbers were 304.9 with 324.7 TQ on a dyno jet The A/F was 12.2. This was with CAI/Tune/Shorties/Xpipe/Corsas/still with cats and stock pirrellis. So I install the UDP's and take it to the dyno and it reads 295rw/300tq with a A/F of 13.0. The only thing different was the UDP and tires, I now have some falken azenis 275/40/17. I really dont know what happened and am holding out to put the other parts in till i find what the problem is. Also I did a dyno inbetween those 2 with a 255/50/17 tire. The dyno is a dynojet and all passes where on the same dyno.

Any ideas help please.

Andrew

 

any1?

 

If the dyno passes were not somewhat close together on the same day, you are in a panic about nothing. Just a weather difference can make a 10hp difference in a dyno pull.
Besides, HP numbers on a dyno mean basically nothing anyway. Time slips are a much better judging delta.

 

I have done over 60 passes on that dyno before that and no problems. The weather doesn't really change here in PR. it is 74-84f all year around

Andrew

 

I'd bet anything those 275/40's weigh more than the pirellis, that should rob you of some horsepower. I wanted a wider and larger diameter tire in the rear, but after reading how much they all weigh I decided against it.

What was your dyno numbers with the 255/50's? I wasn't sure what you meant by one inbetween.

 

i agree and if you changed the rims and they are chrome they are very heavy and you will loose HP

 

Same rims, with the 255 I was at 302hp