First time to the track and got dynoed...

LS2 KLR

Member
Apr 16, 2003
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Houston, TX
Wednesday I took my car to the track for the first time hoping for low 12s na. I had two runs, a 13.0 and a 12.9. On the street is seems my car hooks up great but I spun at the track and cut 2.0 60s. With full suspension and drag radials I should have been cutting at least 1.70s. It was obvious I needed more practice but what bothered me the most was my 107mph.

At Fun Ford Weekend today they had a mobile dyno and decided to see what was up with my car. It should be making 330-335rwhp but only made 307. I made 319 with my last shortblock that was only bored 20 over. My car has three tunes, one at 25 degrees of timing, one at 20, and a nitrous tune. I think what happened was my tune at 20 degrees got copied to the 25 as well. On both na tunes I made the same exact hp?

Now on the nitrous tune I was only expecting high 400s since I didn't have my warmer in the car and the bottle pressure was just under 900. Well it made 530/630 running very rich. The guy dynoing it told me it should easily make 550rwhp and closer to 700rwtq if I got the pressure up. Looks like I'll be heading back to my tuner to figure out what got messed up.

dyno4-29-06.jpg
 
Yeah sounds like something is off w/ your n/a tunes. The no2 tune seems to be about dead on. Just bring back some slicks next time and get it to the low 12's that you want!! (I'm assuming you have at least a 31 spline)
 
I don't know, I'd be careful of those mobile dynos. I've never seen one be close to the actual numbers put out by a stationary dyno. Not that any dyno can't be wrong but i would think that your tuner was more accurate than the mobile dyno.
 
The numbers I made appear to be pretty accurate. My trap speed was low and that was what made me think something wasn't right. It also seems pretty strange that two na tunes with one having 5 degrees less timing would produce the exact same graph and numbers.