awilson40

I saw a car show a while back whwr some dude in his turbo 'tuner car'
was sitting at a stand still and reving his engine.
With no load, his boost gage was showing positive boost.
How is this ???

UK952

Clutch was dragging giving engine load?

sweanders

Didn't Ted Wright post a movie clip when his ST2 Vitesse turbo equipped car did the same thing?

streckfu's

It may boost a little but not much. Did you see what the gauge indicated?

UK952

Yes does he need new Torque Tube bearings? lol !

pk951

If you go back to fellow rennlisted called Ed-Man he was getting almost 7-psi with his garrett ball-bearing turbo at idle.

schnellfahrer

I get some boost by just reving my engine. I did this test a while back after ST posted that he got 8psi. I think I got around 5psi. I can test later tonight and report back.

95Juan

yeah, lots of non-951's make a bit of boost when just revving. sit there and watch an SRT-4 at a stoplight, they'll get a few psi, and even enough to make their BOV go off. my friend's RX7 also does this.

i think my friend's APR-chipped A4 1.8t does this too......

Mike Murcia

A BB turbo will make plenty of positive pressure by revving the engine in neutral.

schnellfahrer

6.3psi.
(Vitesse Stage2 turbo is not a BB turbo.)

WesM951

They shouldn't, I was baffled when I watched my friend rev his 280zxt and make 15psi. No BS.

Laust Pedersen

“Reving the engine”, what does that mean?

1. Keeping it at a steady high rpm? In which case the engine must be seriously sick if a positive pressure is required to overcome its internal friction (or the boost measured before the throttle body).
2. Bleeping the throttle increasing the rpm dynamically? In which case the engine is loaded by the rotational inertia of internal components (flywheel in particular). In that case it should be possible with a free spinning turbo and a number of other parameters adjusted for the purpose (acceleration enrichment, soft BOV spring, hot exhaust, etc.)

Tms951

i can get a few psi on my 1.8t Audi A4 just reving, like 4psi at 4k rpm. the engine is 1.8L and the turbo is a KKK K-04, its a small turbo but larger than stock which is a k-03. With the k-04 I an get 20psi by 2300rpm in third gear and up.

Mike Murcia

Here are a couple of vids of Edman951's car revving at idle.

http://members.rennlist.com/mikemurc...0Rrevguage.wmv

http://members.rennlist.com/mikemurc...evnofilter.wmv

This made me want BB turbo badly.

MM951

My 2.6L Conquest with a Super16G made ~5psi just free reving...

Mike Murcia, off topic but the quote in your sig... if that means what it says its true..I dont think my twin brother and I have ever shaken hands...