2nd gear 40 mph pull for datalogging

[Kevs5.0]

My tuner wants me to do a 40 roll in 2nd gear and let it bang a couple gears for a datalog. My question is would I get better results the higher speed I take it to?

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[NGOT8R]

I tuned with Lund and my tuner told me I was okay doing 2nd gear pulls stead of 3rd and 4th. I was doing 3rd and 4th gear pulls at first, but I kept having to do more logs because I was tuning for pump, E85 and nitrous, so I became concerned that my luck might run out and I’d get pulled over for driving at insane speeds, so I asked about 2nd gear logs and he said it was fine, provided I was able to get traction.

 

[Grimreaper]

Only issue is load on the engine won't tell the full tale in lower gears. It's to quick and not high enough. Data logging through obd2 has limits on the rates too. The more time you can give it to collect data, the better the picture is of how things are holding up

I can just about get away with murder in 1st and 2nd. 10psi, stoich more timing with no knock than would ever expect etc. But hit 3rd or especially 4th and it's starting to load the engine enough that the quality of the tune starts to show.

3rd at a minimum for manual. 4th when you get a chance or pay $100 for bit of dyno time and use 5th.

I sympathize with needing to have several spots to avoid to much attention when dataloging. Can be a real struggle to do a full send safely.

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