Vdyno numbers 3th vs 4th

1776 Views 5 Replies 2 Participants Last post by Redline727, Aug 27, 2016

Jawknee5

Discussion Starter · Aug 27, 2016

So, I'm big turbo with all supporting mods. GTX2867r blah blah blah.

Currently tuning with stratified, they asked for a 3rd log and a 4th log. This is about my 7th time tuning(different companies different stages) in the year and a half I've owned the car, so I'm pretty sure I know how to use vdyno correctly.

So my 3rd gear pull showed 339hp/356tq

And my 4th gear log showed 320Hp/370tq.

I had to stop my 4th log a couple hundred RPMs short, but in that range power drops anyway.

Anywho, the 4th logs I've done throughout the tune have showed lower horsepower numbers consistently, but more torque.

Is this normal? I know 4th pulls show more torque, but I've never heard of horsepower dropping off so much...

Maybe there's more adjustment in Vdyno to account for 4th pulls aside from changing it to 4th gear?

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Jawknee5

Discussion Starter · #3 · Aug 27, 2016

But wouldn't that mean if fourth is as close to 1:1 you get, that numbers in 3rd would be lower?

Maybe I'm gear ratio stupid, but I would assume that Vdyno would adjust and wouldn't think it would be so far off...? I know vdyno isn't 100% accurate anyway, but using as a compare and contrast it's accurate to see modification changes since I use the exact same road...

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Jawknee5

Discussion Starter · #5 · Aug 27, 2016

Yeah it does for temp and bar. Pressure, maybe I need to look more into it.

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