imnotplutonium

iTrader: (4)

I am running tuner cats and am just changing around the constants for the rev. limiter and speed limiter etc. oh also the fans. can you help me out a bit. (hoping you've used tunercats)

on the speedo I have the calibration for my tire size and my stock 2.73 rear end ratio. It shows the numbers that it should put it to get the right speedo setting. but on the right it has the current settings and those numbers are way off.

Current:
Speedo scaler: the number is too big for the field
Speedometer scaler fraction: 0.043
speedometer scaler scantool: 36.199
time between pulses for stop: 7.721
pulses per driveshaft rev: 40

new values:
22
0.992
36.946
40.6
40

these seem way off, not sure why. I have it set to stock speed sensor and 275/40/17 tires, and 2.73:1 gears. F-car

also for the other values
fan 1 on threshold low mph:82*C
fan 1 on threshold high mph:90*C
fan 2 on low:87
fan 2 on high:95
fan hysteresis low and high speed:3*C
fan threshold high speed mph:40mph
fuel cutoff:255mph
resume:254mph
and not sure what to set rev limiter to.

any comments or suggestions about these? or any other swith value i should change. Im just doing the most basic tune until i can get to a dyno and get it done for real.

I know this is a lot of questions any help is much appreciated.

slowmofo

iTrader: (6)

For a 275/40/17 with a 2.73 gear your Numbers are correct.

imnotplutonium

iTrader: (4)

which ones? current or new? and any idea on why such a big discrepancy? what about my fan temps. good?

slowmofo

iTrader: (6)

The new numbers....

Speedo Scalar 22
Speedo Scalar Fraction 0.992
Speedo Scalar Scantool 36.946
Time between pulse 40.6
Pulses per drivshaft Rev 40

Thats what I should be for a 275/40/17 with a 2.73 gear

Fans should be ok, Mine are close to that

imnotplutonium

iTrader: (4)

well those are way off, the speedo wouldnt even move. here are the values i got to work, very different

speedo scalar: 32896
scalar fraction: 0.043
scalar scan tool: 36.199
pulses: 40
time between: 7.721

i got scared when the speedo didnt move. thank god i saved some stock data files

slowmofo

iTrader: (6)

wow, ok if it works.... Is it accurate? Oh and ya always keep your stock files just incase.

imnotplutonium

iTrader: (4)

well those were the stock values so im pretty sure they are accurate. i'll have to get someone to pace me

infinitebird

iTrader: (11)

That's weird. Your stock numbers are way off the norm (which is obviously why the new numbers that should have worked didn't.

This is what I had in my stock tune on a 94 A4 2.73.

speedo scalar: 22
scalar fraction: 0.988
scalar scan tool: 36.199
time between pulses: 41.367
pulses per driveshaft rev. : 40

Are you sure someone didn't install a different type of speedo in that car?

imnotplutonium

iTrader: (4)

well it is the 110 speedo. if that makes a difference

infinitebird

iTrader: (11)

shouldn't make any difference. actually mine had the 110 stock also.

slowmofo

iTrader: (6)

was thinking the same thing... I pulled my stock tune and my numbers were the same as yours. very odd

imnotplutonium

iTrader: (4)

i dont know man, it is really strange. but i was driving it all day and seemed to stay with traffic well. in front of a cop and got radared a couple of times and never pulled over. I was doing 39-40 in a 40. i guess i'll try to research more. I am wanting to do 3.73's but am confused now how to correct the speedo.