gtp6515

How can I use this graph to set my shift points. Right now I am about 68-6850 on the 1-2 & 2-3 and about 6700 on the 3-4. Only one of these pulls worked correct. This is a "little lunati" cam. Anything else I can learn from this graph? Very new to dyno graph and what it has to tell me. Any assistance would be appreciated. This set up has a best of 11.80 @ 118.73 with a 1.795 60' on a stock stall. Is there more in it with adjusting shift points?

thunderstruck507

iTrader: (18)

Have you tried running at the track with a lower shift point? Looks like it falls off hard up there and 6500 or so might be as far as you really need to push it. (I am looking at the 1 clean pull not the others that drop off much sooner)

gtp6515

I have not tried that. I assumed there was some info here that would help me with shift points. Just not sure what to do with the info. I feel like I may be over reving based on this.

JDMC5

iTrader: (3)

I agree with what was said above. Assuming the other curves look like the single pull that made it past 6500 I'd say 6500 is a good shift point. Try a couple different shift points at the track.

gtp6515

Is there any rule of thumb for setting shift points?

JDMC5

iTrader: (3)

Depends on a few things but somewhere in the mid 6 range is a good starting point for a cammed na setup. The last setup I did similar to your with a livernois stage 2 cam I have set to 6400.

gtp6515

My fear with messing with it is going slower.

gaskill

You are almost at peak hp & tq @ 5500rpm. You need to shift so that you are around 5500 after shift. This will keep you in best power range. Depending on your gearing, will probably be in 6250/6500 range.

JDMC5

iTrader: (3)

You won't know unless you try lol

gtp6515

Thanks guys.

thunderstruck507

iTrader: (18)

General rule of thumb is a few hundred past peak HP, but the more precise way is to compare the HP at your shift to where it falls to in the next gear like posted above. Whichever keeps you higher in the RPM range will generally be quicker.

If you don't own the tuning software see if your tuner can copy your tune with a few different shift point set ups and come to the track with you. You can just quickly switch between runs and see.

In my case, dropping my shift points didn't make the car faster or slower but I left them lower because it's just less wear and stress on the motor for nothing if it doesn't get faster.

KrisR

iTrader: (2)

Hello gtp6515. It's Kris with the dark green C5 convertible (formerly white 2011 GT, plus many others). Nice to see you on here.

I would say maybe back the shift points down 100rpm and see if it helps or gets slower. If it helps, try another 100 rpm lower until you find the sweet spot.

gtp6515

Thanks Kris! See you around!

casias

iTrader: (1)

There is a guy in Tampa named Chris Henry who has done extensive testing on the 6l80 in the G8. He can help you. He is a vendor on flg8cc.com