*eurospeed951*

These are my dyno charts from my 2.8 with stock turbo and injectors at 13/14psi and 38psi of fuel at idle with vac line on. The red line was a run done at 11/12psi. I made a yellow line to get an idea of what it might be like at 15/16psi and a purple line for 17/18 psi. I don't think I am going to change the boost till I get some more mods and put it back on the dyno, but I think I could get away with 2 more psi. what do you think? I also would have no reason to ever shift after 5.5 since my power drops after that so if it starts to go lean after that it should not matter. Right?

http://www.student.nvcc.edu/home/cmc...661%20copy.jpg

http://www.student.nvcc.edu/home/cmc...681%20copy.jpg

special tool

Wait a minute - your a/f is 17.5 and you are adding 2 psi?????? Your chips are standard Autothority for a 2.5 with maf and stock turbo and boost level - is that right?

*eurospeed951*

I don't think so. I don't have a clue what that 17.5 is. If you look at that graph I never come close to that I think the most lean I got was about 12.1 which is what I should be at. That was not till like 6200.

Jake951

Not necessarily. If you want maximum acceleration, you need to compute the torque at the rear wheels as a function of rpm in each gear, taking into account the torque multiplication of the gear ratios. When the torque at the rear wheels drops below the torque that would be available in a higher gear, then you upshift.

rage2

Actually, at the top end, the TQ and HP curves on your extrapolated lines would drop quite a bit and be even with your 13/14 and 11/12psi lines. This is because your stock K26 is maxed out .

Waterguy

As Jake says you have to compute your optimum shift points. Using your 13-14 psi torque curve (since it is the measured one), they are:

1-2: who cares, tires are spinning anyway.
2-3: 6,000 rpm
3-4: 5,700 rpm
4-5: 5,500 rpm

HOWEVER, with that torque curve you do not lose much by short-shifting at 5,500 rpm in every gear, assuming you don't lose boost through the shift. short-shifting might cost you one or two 10ths in the 1/4 mile.

When your boost hits, it HITS with that little turbo. Might be interesting keeping the pointy end forward. Have fun!

*eurospeed951*

oh it is