hosrom_951

I have been looking at various people on and off rennlist who replaced the vacuum hoses and lines under the intake.

Basically 50% kept the venturi (for earlier models) and 50% deleted the venturi.

I also noticed that some track cars still have the venturi installed......

This got me thinking, should i re-install the venturi system? i still have all the parts (the venturi tube, the weird looking 'Y' piece and the restrictor).

James (Special Tool), what you're input? you are still have it installed right?

special tool

I took everything out from under there - even the isv.
The SMT6 has no problem compensating for these motors, bells and whistles.
I even leave it a little lean and it reminds me of my old 240Z after I set the carbs in Fort Collins and brought it back here...little lean

Oh also - the main reason is that I have no confidence in that grey and black plastic piece of **** (whatever the hell it is) between the isv and brake booster.
1/2 diameter intake leak on a 951 will cost you around 20% of your horsepower.

theedge

Leave it off.

streckfu's

Ditto.

Most of the time, the rubber lines connecting to the Venturi are shot and need to be replaced. Why bother replacing all those small lines when it's easier to install a few lines that replace the venturi.

hosrom_951

James,
You still have the ac?

Guys: It was just a thought since i came across a local 951 buddy, who informed me that it should still be there:

" There is a reason why Porsche had it".

And i said:

"There is a reason why Porsche removed it in later models"



How is you're brakes under partial/cruising throttle?

eniac

I have an '88 with no venturi however I recently removed a venturi on a customer's '86. His had a massive leak and he was very concerned about removing something Porsche had put in. I told him the same thing, "well Porsche also removed it in later models for a reason". When I explained to him I could do the removal with all OEM hoses he gave me the go ahead. Shortly afterwards he brought the car to the track (Gingerman). The car was better without it since the 1/2" air leak was gone and will never come back....at least not from that POS venturi. Leave it off.

bloodraven

Boooo on venturi!!

Porsche-O-Phile

So what's the best way to bypass all this stuff? Just cap it?

streckfu's

Pull it completly and replace with the replacement hoses (venturi delete kit) as sold by Paragon, Lindsey, etc.

Porsche-O-Phile

I'll look at those. Is the ISV functionality retained?

streckfu's

Yes it is. A few have chosen to get rid of it but you'll need something that can compensate for it. I kept mine.