Question on trying a dyno - any recommendations for running my car on a dyno in the Dallas-Ft Worth area? Also, anything I need to be aware of as I haven't ever done this before? What should I expect as far as time/cost/result reports?

I bought my car with a Sportec tune and I'm curious what numbers it is putting down. It feels significantly faster than my previous TT.

Thanks!

Todd

if you are awd u need a awd dyno or drop the front driveshaft to dyno. also make sure they have the needed high velocity fans to get the most out of the car

If the car has its AWD intact it must be put on a dyno that has rollers for all 4 wheels. Besides this the rollers must be connected so the front rollers turn at the same speed as the rears. The max. allowable difference in speed is 5mph.

Or if you want the front drive shaft can be unbolted and the car dyno'd on just a two roller dyno. Wheel power might up a bit higher since the front diff/drive axles aren't eating some HP.

Hopefully you will use a dyno shop that has experience with cars with independent drive axles and they will not cinch the car down so tight the axles are no longer parallel to the ground.

If the drive axles are not parallel this costs HP and could harm the CV bearings if the car spends much time on the dyno.

Be sure after a dyno run you let the engine idle for a couple of minutes to cool the turbos. Turn on the A/C which turns on the radiator fans which helps bring the coolant temp and the oil temp down.

I know of 2 shops with AWD dynos. Cobb Tuning and Jotech. Cobb doesn't have the cooling needed for our cars. Jotech does.

I'd like to dyno mine too. Maybe we can arrange to do them at the same time. PM me.

Will do Patrick - I'm in no hurry but I am curious.

Are you going to try C&C this weekend? Last month was as crowded as I've ever seen it - totally full by 7:30.

I have been on every kind of Dyno with my car since I started modifing it,,,LOL.
If they do 996 turbos,they should have 2 high power carpet type bolwer fans for the intercoolers,its a must. I have been to shops that didnt,so make sure first..

As others mentioned, you need to dyno on a linked dyno if you're AWD and don't want to pull the driveshaft. I went through this in summer and fortunately opted out of dynoing on a non-linked AWD dyno out of fear...and was told you absolutely should not try that.

Most tuners around here pull the driveshaft to dyno 996TTs from what I understand, but I have yet to dyno mine at all.

Steve, There is no problem going on a two wheel rear dyno...
Few examples,,AMS did ALL there tuning at on a rear wheel dyno with there 996 turbo first ,,I was on that one also...Protomotive uses rear wheel to bulid many mega HP cars,I was on that also..Porsche Exchange uses a rear wheel dyno to tune all the Cup PCA cars,,I was on that also...
Many members/tuners use a rear wheel dyno,,But an AWD one is better for piece of mind and less hassle because of drive shaft removal..
Be more concerned on the dyno operators procedure..

Steve, Maybe I read your message wrong?..Sorry if thats the case.

Heh, I believe you may have read it wrong...but no problem at all. I've never pulled my driveshaft...but avoided dynoing my AWD setup on a non-linked dyno (which turned out to be the right call). I just want to ensure that the OP doesn't dyno his own car in AWD mode on a non-linked AWD dyno, only a linked AWD dyno.

To erase any doubt or fear (particularly if they cannot tell you about the dyno), then you should pull the driveshaft...and you'll be fine.

Turning on the air also turns the fuel cooler on..

Thanks guys - I'll make sure wherever I go the guys know what they are doing. I'd rather not have to disconnect anything so I'll look for an AWD dyno setup. What do shops normally charge for the service?

I think Jotech charges like 150 for a few baseline runs.

While the fuel is cooled by a line from the A/C my impression is the A/C compressor is on -- albeit at some reduced output -- all the time thus the fuel cooler is cooling the fuel all the time.

But if I'm wrong then sure turning on the A/C helps cool the fuel. Then the routine would be I guess to have the A/C on right up until the dyno run turning off the A/C just before the pull to have the fuel as cool as possible at the start of the run.