I have been doing a lot of testing and have found a pretty good (safe) place to do some g-tech runs.


first run @ 6 psi:

60' 2.305
330' 5.985
1/8' 9.034 @ 82.43 mph
1000' 11.664
1/4' 13.885 @101.74 mph
0-60 5.387s


Second run @12 psi:

60' 1.963
330' 5.544
1/8' 8.630 @80.36 mph
1000' 11.336
1/4' 13.648 @97.09
0-60 4.810


As you can see the 12psi run gave me a better time but slower mph, if I could learn how to post the graphs, you would see that after the truck shifts into second it trip the misfire code and unlocks the convertor for the rest of the run. I got lucky and the engine did not misfire on the 6psi pass, (it normaly would have set a code.) I'm pretty happy with the times, even though they are just G-tech times, it gives me hope for finding the cure for the misfire and running a real 13's pass, or maybe even a......................

 

What is your elevation there?

 

Shouldnt you be running a little bit better than 2 tenths difference off double the psi???

Thats like 3.3hp per psi!!!

It should be like 15-20hp per psi!!

 

Ya it should but, when the misfire code comes on it unlocks the convertor. The 12psi run is about a half a sec faster than the 6psi until about 60 mph, then the 6psi begains to gain on it, at the 1/8 mile the 6psi is going 2mph faster than the 12psi. I'm only guessing that a unlocked converter will cause this much of a diiferents, but it is the only thing I can come up with.
I would'nt think the two passes would be that close, but I think it still needs alittle 12 psi tuning.
Again this is all G-tech time so take it with a grain of salt...........



Elevation is around 4500'. Maybe a bit more but not much I think.

 

Dusty,

Hey I have to be in reno on the 14th. We should meet up. I will give ya a call later this week. 13.6..... Yeah you will be in the 12's at SAC.


Later
Erick

 

I was just asking because I was down at sea level in OR a couple months ago and with my little 4.8 and T60-1 at 7lbs I ran 2 G-Tech runs of about 13.6 around 99-100 mph. I had 1.9's for a 60' launching in 4 high with 5 lbs of boost.
My best run here in WY, about 4800 ft, before was about 14.35 around 97 mph, but I have it running much better now then when I made that run. I think I could run a high 13 up here now.
Some thing doesn't seem right with your setup, I would think you should be making more power then what you dyno said and run a little quicker. I know the 4l80 eats up some hp, but I wouldn't think it would be that much.

 

I agree with kbracing. At 12lbs my truck made 440ish and at 17lbs it made 530rwhp. I think you got a problem. I would check your tune to make sure everything is ok.

 

Ya I think I have a problem too, but what it is, I'm not sure the tune looks O.K Allen has been helping me out there, and there is the misfire issue.Take a Look.