Went to the CSP Test and Tune at Bandimere last Wednesday and ran consistent 12.9's at 105 with the Density Altitude at 9070'. I even had a guy in a red 2002 Corvette Z06 come up afterwords and tell me he was running 13.4 in his vette and was shocked I had a 3/4 ton truck... Now I just need to get my 60' down (was 1.8's all day).

What is this equivalent to at sea level?

Thanks
David

good job david.drop some 265 on there, air them down,and shave off some more.shpuld 60 ft in low 170's.i sure miss that truck.:D
chays

I would guess that you would be .4-.5 faster at sea level.

Hey Chays!

Good to see you back on the board. I love this truck. You did an outstanding job on it. Thanks again and I hope all is going well with you. Let me know if you're coming out to hunt. I picked up an extra set of wheels for it (PYO's) and will be mounting some 265's soon. I need a tire that has a D rating (for towing my toyhauler) and can get it done at the track. Any suggestions?

David

good job david.drop some 265 on there, air them down,and shave off some more.shpuld 60 ft in low 170's.i sure miss that truck.:D
chays

That doesn't seem like much since the DA was so high. 9000' is pretty thin...

David

I would guess that you would be .4-.5 faster at sea level.

David, I cut 1.65 60' times with "e" rated Michelen LTX's

Thanks Rob. I thought you originally said they were MTX's and I couldn't find those so it's good to know they were LTX's as those are still available. What size tire was it?

Also, I read the write up in Diesel Power about the Challenge. Heard you were running high 12's at altitude (4400') . What did you do to cut that down to 12.4? PM me if you prefer.

Thanks again,
David

David, I cut 1.65 60' times with "e" rated Michelen LTX's

are you running rob's race tune?if so i would have thought you would have been a bit quicker.
i went 12.60;s at 108mph at 400 ft above sea level in 95 degrees outside.very bad air.might need to log some runs and let rob take a look at them.you might need a little more boost.:D because it was very safe at 12.60's;)
i think there is more there.rob will get you there.

I'm running a new IdahoRob tune (DSP 5 now) instead of the DSP 2 tunes you had. I was running 13.3 with the same DA when I had the old race tune. That equates to 12.5 at sea level so not much different than what you were getting. The elevation here and hot summer weather make the Density Altitude (DA) really high so the performance is typically less. Typical summer day here has the DA in the 9000-11000 foot equivalent altitude and everyone knows you lose performance at high altitude.

I found the NHRA correction tables for the 1/4 mi and I used the 1/2 table (since it has a turbo). It says I am running the equivalent at sea level to 12.2 right now (slightly faster than the old tune) which isn't bad considering I'm getting 1.85 60' with the 285 BFG A/T's.

If I use your weather conditions and assume a dew point of around 70 deg (typ there with a lot of humidity in MS), then the DA for your run is approx 3100' equivalent. That is approx equal to 12.4 at sea level (1/2 table).

I do think I'm running a pretty safe tune right now as the only smoke I see is right at the start. During the run, there isn't any (just like when I went for the spin with you). So there may be room for more fuel too :)

David

are you running rob's race tune?if so i would have thought you would have been a bit quicker.
i went 12.60;s at 108mph at 400 ft above sea level in 95 degrees outside.very bad air.might need to log some runs and let rob take a look at them.you might need a little more boost.:D because it was very safe at 12.60's;)
i think there is more there.rob will get you there.