996 turbo dyno

[Vixpy1]

So, I guess it's fairly well known, certainly amongst my customers, that i won't dyno turbocharged rear engined pork. I get asked alot to do it, but because of the various drivetrain and heat related issues, I've always declined. If you can't do it properly, don't so it all has always been my motto, in the case of the dyno anyway

I got my 911 tubby a few weeks ago, everycar I have ever owned has been on the dyno, some having had many runs. However 3 weeks after getting the tubby, it had been nowhere near the dyno. It was as fast as i was concerned fast enough. :



However, after a chat last week with my good friend Adam, (Anyone who uses fearnsport may have met him) He told me to stop being a poof and get the bloody thing on the dyno.

So, Sat afternoon after all the customers had left, with it pissing down with rain. My friend Dan and I loaded the 911 onto the dyno:



(Dan being the poser in the photo)

So after getting the car strapped down and the fans on, and after giving Dan orders to keep spraying water down the intercooler ducts, off we went.

2002 Turbo, Fearnsport remap and diverter valves, design911UK exhaust. The work was carried out about 3 years ago by a previous owner (whose 993 turbo is ironically in Fearnies at the moment)



Quite pleased with it tbh, we got a good few pulls out of it. There appears to be a hole in the power curve at the higher end, the car could have been pulling timing, or it could be the exhaust or Adam said that particular map was a fairly safe one. The car is running just above 0.9 bar boost

And no, I'm still not doing rear engined turbo engined pork on the dyno

Ps, i'd like to give a massive thankyou out to Matt at Fearnsport who has been an absolute legend over the past few weeks answering my inane questions!

Edited by Vixpy1 on Monday 31st May 21:27

[Vixpy1]

3rd Mr F

[Vixpy1]

ZeroH said:

Vixpy1 said:

3rd Mr F

You have a 4wd Dyno Dynamics rr or just 2wd ? If 4wd whats the issue running 4wd 911s?

There are camps out there that insist the propshaft should be disconnected on the 996 turbos when dynoing, however there are those that say the 996 is fine and that its the 993 thats the problem.

Its 4wd

[Vixpy1]

Nano2nd said:

What difference does it make in third?

Keeps the runs short, Mr F is making an old gag from his TVR Cerb days

[Vixpy1]

ZeroH said:

Vixpy1 said:

ZeroH said:

Vixpy1 said:

3rd Mr F

You have a 4wd Dyno Dynamics rr or just 2wd ? If 4wd whats the issue running 4wd 911s?

There are camps out there that insist the propshaft should be disconnected on the 996 turbos when dynoing, however there are those that say the 996 is fine and that its the 993 thats the problem.

Its 4wd

Not sure I understand. Disconnecting the propshafts is necessary for 2wd dynos yes, but not 4wd ones, thats the whole point !

Or am I missing something ?

I've seen literally a dozen 996turbo's dyno'd on 4wd dyno dynamics no issues... seen a few 993turbos done also, again, no issues.

Some people say you can damage the 4wd system running them in 4wd on the dyno. Not sure i agree.

My major issue has always been cooling, as they are so sensitve to intake temps