Mellowdien

I g-teched for the first time since i've had my mustang last weekend
I was expecting low 14's, the results were devastating, i got 16.4!!!!!
I drive an 07 automatic GT 3.31 gears, fully stock, 20" American racing wheels.
I knew the wheels were going to slow me down but i never expected it to be so drastic.
I ran twice, first time i just bottomed it at the go,... second i reved up to 2-3k both were around 16.4 .
Does anyone else on 20" have such awfull times?

acascianelli

I think that figure is inaccurate.
I can't say for sure because I've never used a G-tech
I bet that having a passenger with a stop watch would be more accurate than a g-tech.
I would read the documentation for the g-tech, maybe it needs to be calibrated or something.

Lees07GT

What is your tire size? If you don't keep your overall wheel/tire diameter close to stock, then your 3.31 rear end could be effectively less.

Mellowdien

Nexen N7000's 245 tires on 20"american racing wheels,..front and back

Stkjock

what's the diameter? or at least the profile so it can be figured out.

MexGT

I had some problems with my g tech also the first times i tried it... i was getting times like a V6.
The problem in my case was the street.
First you need to check that the street isnt in a slight uphill or downhill, or the readings wont be acurate, this is very very important.
then you need to check if its concrete or asphalt, cause if u have excesive wheelspin the results will suck hardcore too.

When u get this 2 things covered u will get nice times. For being stock and with 20´s u should be doing low 14´s.

Goodluck

Lees07GT

Okay, the width is 245. What is the profile? As in 245/35?

Mellowdien

Yes 245/35ZR20

06musgt

they can be inaccurate,back when i had a 02 v6 mustang,me,my brother and our friend went out and ran our cars.my 02 v6,i ran 16.7,not bad for a v6,then my brother in his 98 gt,16.1,not good,then our friends in his 89 5.0 lx,he ran a 16.4,something had to be wrong.i knew that me and the 89 would be close but the 98 gt should have down alot better.i don't always trust those g-techs.

Lees07GT

Okay.Then the overall size is actually just slightlysmaller than stock which means that yourtire size has no adverse impacton your effective rear end ratio and, in that regard, has nothing to do with your slow times. The wheels may have a slightly negative effect from the likely larger rotational mass and maybe they won't stick as well, but theywon't cause you to runin the 16's.