tornado019

Ok I think I am having a problem with my car. I would like to get some input from anyone who can help.

Here's the deal, I am watching my quarter mile times slow down while I had more hp to the car! I am running a Zex dry shot nitrous setup, Stillen intake/ y-pipe, and removed the cat for a test pipe, muffler. I put in a Walbro fuel pump. Droped it on springs and shocks and wheels with pretty decent tires (grip wise).

Now a while back I went to the track with the nitrous jetted for a 75hp shot, no bottle heater or purge, with a temperature around mid 60s. I ran a 14.22 followed by a 14.19.

Fast forward to last night. Went to the track with a 100hp shot with a bottle heater and purge. My first run sucked off the line and was a 14.6, second was still slow but I hit the nitrous sooner and it pulled good, but ran a 14.3. I didn't get to make any more runs. My 60' was 2.4 on the last run.

Why is it I have added a heater for all the pressure I could want, and 25 more horsepower worth of nitrous and I am slower? I haven't been able to repeat a 14.2 to save my life. That was a while back and since I run mid 14s. This 14.3 is the best I've done since. (also this is the first time on the 100 shot)

Whats wrong with my car!!?? There's no reason to slow down this much. At least not that I can see. Please Help Me.

Ceasars Chariot

iTrader: (16)

60 foot times
temps
humidity

pull out the timeslips you save from each track day and compare 60 foot times, the more power you add, maybe you are finding it harder to keep traction.

how about the temps/humidity ? the conditions could have been worse, making relative HP lower.

you mentioned wheel change ? im not clear on if you swapped rims or not, if so was the rims larger or the same, whats the story on that ?

same track right ?

BigLou93SE

iTrader: (10)

check to see if your car is mechanically sound, too. Knock sensor, plugs, etc? Have you done any dyno pulls, before and after? That would better tell if something is up with your car, compared to a previous date. With track info, there are just too many variables. A good indicator, what was your trap speed like, before and after?

tornado019

Temperature last night was about 42, it was chilly. Not sure on the humidity. I am running the same wheels I always have been. Traction is no issue, I launch at about 2000 rpm and hit the nitrous at 2500. The nitrous trys to spin but it really doesn't, traction is perfect. It is the same track. I think my 60s at 14.2 was 2.2 or 2.3, right now its 2.4, so yeah, its a little slow off the line.

jackiss2888

iTrader: (3)

doubt there was much humidity at 42 degrees.