BROKER

Hello all,
I just received my G TECH PRO in the mail yesterday. Im curious does any one else have one, and if so , how accurate do you feel it is. After 3 attempts my best 0-60 time was 5.19 and my best 1/4 mile time was 13.19 @ 109 mph. Does this sound correct? The reason Im asking is because it seems to be a bit slow.

By the way, I have the Dinan mods, exhaust, chip, cold air intake.

Eric
01 M5/Silver/Silverstone

C43///M5

Hi Broker,

There was a pretty long thread about this Greg started a couple weeks back. Do a search and I'm sure you find it.

Cheers!

greg

Hi -

I think the G-tech is extremely accurate based upon the way it works. Your times are respectable. I believe fuel quality is a factor in performance.

By the way, on your next 0-60, try a full on braking exercise. I got 113 feet 60-0, which is better than what the magazines say.

Tom C

Broker:

Your 0-60 times appear a bit slow by about half a second. How did you launch the car? If you are having trouble off the line it could explain the lower than expected times. Although your 1/4 mile time appears reasonable. The cold air/higher flowing intake you installed should bring you close to breaking the 12 second barrier. However, the free-flowing exhaust may hurt low end torque. Sometimes higher flowing exhaust systems reduce backpressure too much and cause the loss of power down low. This could be why the 0-60 times are slower and the increased horsepower is barely overcoming that lost time at the end of the 1/4 mile.

Just my $.02.

Tom

BROKER

Tom, Im launching the car from about 2200 RPM. I agree with your 1/4 mile statement, on a good day with great conditions the car could break into the 12s, my 0-60 times unfortunately are very dissapointing.

Eric

BROKER

Tom, i figured out how to launch the beast. With only a few gallons of gas in the tank and one passenger in the car I pulled a 4.71 0-60 time. I launched the car from about 1400rpm with minimal wheelspin.
Eric

Tom C

Broker:

Great Job!!! I sincerely excited for you! Thanks for the update. Were you able to run through the whole 1/4 mile after perfecting the launch?

Minimal wheelspin is the key. The first time I took my Cobra (Mustang not to be confused with your beast), I ran a 15.2@97mph. The trap speed wasn't too bad but the E.T. sucked. I was over-anxious and dumped the clutch at the start and just spun...and spun...and spun (you get thr drift). Even with practice I could never get below a 14.2 @101. My starts were never very good (probably the street tires) and I pretty much gave up after I blew my transmission.

Anyway (sorry for digressing), I hope you get a chance to run through the whole 1/4 mile with the improved starting technique. Please let me know the results.

Good Luck,

Tom

greg

Broker - that is truly excellent. Two questions - how/when are you executing the 1-2 shift? Also, what are you using for fuel - what is the octane rating?

Thanks -


/Greg

Caribbean-M5

BROKER

I have had a Gtech performance meter for close to a year. I don't know exactly how accurate it is in absolute terms, but it is definitely vey useful and accurate when comparing the performance of the car before and after doing any modification. I have used it extensively in my old 911 turbo, not on the M5.

Zoli 007

When you guys launch your M5, do you dump the clutch or gradualy release it? Also, can you do a hard and fast 1-2 shift? When I rode in a friends M5 in Germany, when he shifted into 2nd the DSC cut in hard. The question is, if you turn it off, do you get extreme wheelspin in 2nd from a hard shift? Broker....excellent 0-60 time. Most people only dream of getting anywhere close to the magazine specs for the car. Is it because they could care less about the car?

daniel

Your times are actually damn good.

The G-Tech will report 1/4 mile times and speeds which are better than a dragstrip (for obvious reasons to those who run on the strip).

To get the good numbers, you have to run with DSC off, experiment with wheel spin off the line, and try not to light up the tires on the 1->2.

The cold air intake isn't going to give you any noticeable increase on performance (IMHO), just as the exhaust isn't going to either. This isn't a Viper or a Vette, the parts just don't get you much. There are so many other factors, that +/- 10 hp just won't matter.

Keep trying, and yes, some magazine tests are not quite "real world." They can adjust rear tire pressure or spray a bit of "traction" compound on the rears.

Dan

BROKER

Greg, I,m shifting at about 6900 rpm just enough time to avoid hitting the 7300 limiter. 7300 because of the Dinan software. As far as gas or octane. I use Mobile 93 oct.
Eric

BROKER

Tom, I was doing my o-60 runs on a new street by my house where they just started construction on new homes. The road isn't quite long enough to get a 1/4 mile time. I,m going to find a road long enough this weekend to run several 1/4 mile tests. I'll keep you posted.
Eric