How does altitude and temp affect the L's
 

Finally had a chance to run my 99. Truck ran very well compared to others. For instance a Syclone ran a 14.8 & 15.1. Again this is the first time I have run at a track (very bad RT), but not the last time that is for sure (lots of fun). I launched with no brake torque and got the following (no spin on track but on street it will smoke them through 1st)
RT- .857 HA HA
60'-2.168
330-6.103
1/8-9.323
MPH-77.08
1000-12.081
1/4 14.428
MPH-95.94
I was expecting better for a stock run (K&N and x-pipe in place of muffler) but everyone was hit hard by the conditions. 95 degrees (who knows on the track) and at 3000 feet elevation. Does anyone know a thumbrule for temp and altitude effects. I now am truely interested in modding this thing now that I have a baseline. Anyone coming to Boise Idaho let me know...

ttt

Some of you guys must have a super souped up version of the L than I have. I've seen dyno runs from others that I wasn't so impressed with, but some of you can get 2nd and 3rd gear chirps, either someones making 600hp stock or some are running more than 28 psi on the street?

Um 350rwhp doesn't do squat anymore, I think its the later, guys lower your rear tire pressure and you won't loose a street race to a ws8 transam. I'm about 100-1 and only lost to a 99 hard top Viper, come on guys try this out. Also tire wear seems to be pretty good I'm about 1/2 down at 8000 miles.

I do agree that the tire pressure does have some factor in traction abilities. I have also seen the higher temps during the summer affect how I hook up. I have been running 28psi in all 4 but I did lower the pressure when I went to the track. I had no traction problems there probably due to the traction helper they sprayed on the track. My question still remains, what is a generic thumbrule as to correcting for altitude and temperature effects on 1/4 mile times? If they have a correction for Dynos (recent posts SAE etc), can't something apply to this?

Snonut: There is a formula... magazine's sometimes report: "Corrected ET"... which is adjusted to sealevel, some nominal temp, etc... Anyway, go to: www.google.com and enter "corrected ET", you'll get a bunch of hits... the first one I get is, "HOW TO COMPUTE CORRECTED ET".

F1car: I get real bad wheel hop if I run under 31-32 psi... so I run 34-35 (no wheelhop, but lots of smoke)?!

-Dreamin

shonut,
Bone stock, just stomping on it from idle, I got 14.99 at Bandimere in Denver, about 6000' elevation (about 80 degrees). Your number seems to be right in line with mine.

Kent

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99 White Lightning
#2277, built 6-11-99
52 F2 Street Rod built from scratch-yes by me!

Thanks for the info. The links are out on the first page but at least I have a lead. If I get to the 13's in these conditions I will be happy.

Shonut,

As was posted there are formulas for correcting ET to what it would be under SAE net conditions. I know many of the major automobile mags (Car and Driver, Motor Trend, etc) do this. It helps give a fair comparison b/w cars run on different days at different tracks in different conditions.

However, a motor with forced induction is not as effected by the conditions as is a naturally aspirated engine. I know that NHRA has a different correction factor for N/A and blown cars.

However, if you were running at 600' like we are here in N. TX, you'd be in the high-13s, I'm sure. Your time looks right to me, given the conditions you were racing in.

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Wes Tarbox
90 LX 5.0 (10.69 @ 134.7)--597rwhp/590rwtq
96 Cobra (12.63 @ 114.5)--390rwhp/441rwtq
99 Lightning (13.20 @ 103.3)--362rwhp/444rwtq
00 Expedition XLT 5.4
http://members.aol.com/Wa2fst/index.html

You bring up some good points Wes. Maybe that is why some of us are having better luck beating fast cars due to them being hit harder by elevation changes. Thanks again.