FATS Times?

**scheides** · 10-13-2006

Has anyone ever done any testing for FATS times with their car? I'm hearing from some audi guys that this is how they measure how quick one car is vs another (to take out driver interaction, etc in quartermile times and whatnot).

What this is is a time measurement. You measure how long it takes your car to to accellerate in third gear from 4200-6500rpms. 7.0 is slow, 5.0 is fun, 3.2 is quick. I imagine (for some bigger turbo guys) this could be expanded to do a 3rd gear run on a evo/dsm from say 5000-7300rpms (i.e. a 2300rpm sweep).

Any interrest/history in this? These audi guys are crazy for it, I thought it'd be cool to setup a website that anyone could post up their car make/model/mods and fats times.

Here's an example site (audi punks):
http://fats.audi-quattro.org/

**Kracka** · 10-13-2006

Never heard of it before until now. Seems like a decent idea, but it can't be used to compare non-identically geared cars. For it to work, there would have to be a seperate database for FWD and AWD DSM's.

niterydr · 10-13-2006

RPM sucks, it should be mph. My gears are STUPID LONG compared to a dsm's.

**scheides** · 10-13-2006

Hrm, true true. But if you did it in a gear that had a *close* to 1:1 ratio, would it not matter?

niterydr · 10-13-2006

Quote:

Originally Posted by scheides

Hrm, true true. But if you did it in a gear that had a *close* to 1:1 ratio, would it not matter?

Yeah, then why don't we all just dyno and then calculate power to weight ratios

.

**Kracka** · 10-13-2006

I think a xxmph-xxmph would be a better comparison, at least you can compare between cars then. The only drawback then would be a possible shift bringing driver ability back into play. I think human-error in time recording would be huge though.

tpunx99GSX · 10-13-2006

Just another way to bench race.

**Shane@DBPerformance** · 10-13-2006

They don't like the dragstrip? Their gear ratios and tire sizes would have to be exactly the same for it to mean anything.

It would be hard to do with DSMs and Evos with all the different gear ratios from FWD to AWD, from manual to auto, from Evo 5-speed to Evo 6-speed. A MPH range might work, but you would need to find soemthing that would fit the stockish guys who don't rev higher versus the big turbo guys who don't spool until 5500+ in 3rd gear but might rev to 8500. Even MPH can get thown off a lot by different tires.

carltalon · 10-13-2006

The dsmlink guys use 70-90 mph times as a judge. under 2.0 sec is considered fast. mine runs around 1.7 on pump. mph seams better then rpm IMO.

YiNYaNg · 10-13-2006

Quote:

Originally Posted by tpunx99GSX

Just another way to bench race.

Yes!

Tell them to hit the track and practice.

sleepydsm · 10-13-2006

Whats the point of modding your car for performance reasons if you don't want to really race it?

CVD · 10-13-2006

It almost makes sense. Drivetrain and gearing dont matter, its like an E-frumroll. Something anyone can do with a stopwatch, and unlike a 0-60 time or whatever its harder to fuck up by being a shitty driver or not having stopwatch skills. So I can see why they do it, but like Tom said its just more pointless benchracing.

Shotgun! · 10-14-2006

Stopwatch=retarded errors.
AEM log=something to talk about.
For Audi guys (ei people that don't know how to drive to the drag strip) this sounds great.

**JET** · 10-14-2006

Quote:

Originally Posted by niterydr

Yeah, then why don't we all just dyno and then calculate power to weight ratios

.

Unfortunately that doesn't work. I had an engineer buddy who was dead set on that idea. He thought a bike was invincible, which on paper it is. We all know that is not true in real life.

**scheides** · 10-14-2006

Yea, the time is calculated with a logger, so you can get an exact time instead of something with a stopwatch where you'd get some amount of error. Yes, this is another way to benchrace, I was just wondering people's opinions about it.

niterydr · 10-14-2006

Alright then. 5000-7300 in 3rd gear?
Here is one at "29psi" on c-16..probably around 650awhp.
4996rpm. 10.47psi, 55.78mph 3:17.440 aem time
7043rpm. 28.58psi, 77.70mph 3:19.000 aem time.
So thats 1.56 seconds, am I cool? That is 2nd gear though, kind of close to a dsm's 3rd gear.

From the track on pump gas (11.8 run against Chris up at BIR).

5109rpm 8.661psi, 96.48mph 2:49.720
7105rpm 27.71psi, 128.8mph 2:53.400

So that is 3.68 seconds, 92 octane, about 500awhp.

Finally a 12.23@131pass, c-16 plus nitrous.

5047rpm, 7.681psi,nitrous on, 90.99mph 13:54.200
7031rpm, 27.45psi, nitrous on, 127.7mph 13:57.480

So that is 3.28 seconds.
So I pick up about 10mph per second.

**Shane@DBPerformance** · 10-14-2006

Do you rev higher than 7000 normally? You times are getting skewed by not even being full boost at 5000RPMs. 6000-8000 would probably be a better range for most big turbo guys.

niterydr · 10-14-2006

Quote:

Originally Posted by ecoli

Do you rev higher than 7000 normally? You times are getting skewed by not even being full boost at 5000RPMs. 6000-8000 would probably be a better range for most big turbo guys.

Yeah I go to 8700rpm usually. Some of those logs are from the track and mapped out to 8k.
I could post 6k-8k, but I dont' want to screw up the readings

.

FattyBoomBatty · 10-14-2006

Quote:

Originally Posted by niterydr

am I cool?

That can't be determined by times. In fact, the jury is still out for you, bud.

niterydr · 10-14-2006

Quote:

Originally Posted by FattyBoomBatty

That can't be determined by times. In fact, the jury is still out for you, bud.

Badass, atleast the jury hasn't decided "not cool" yet!!