928mac

Earlier this year i took the plunge into the supercharged 928 world.
I installed a VCB supercharger that I bought from Victor Edger.
The stage 3 kit he sent me is basically a stage 2 but with the already installed engine management system that I have it can be tuned for more power, or considered a stage 3.
This kit is a Rotrex 38-91 supercharger with a water cooled intercooler complete with rad and pump. I started with a 75 mil pulley but have also purchased the smallest 70 mill pulley with the non slip coating. (not yet installed)
Contact Victor for details on his kit

I also installed a Vacuum pump from Colin Jenson to assist in controlling crankcase ventilation. I am having a problem with controlling the major vacuum that this pump has and plan to install a regulator. It is sucking 15 inches at an idle and pulling the oil out and overflowing the catch can.
I vented the hose it draws from to temporarily reduce crankcase vacuum.



















I am happy with the extra horse power but the dyne numbers were low due to my throttle position sensor failed and I was running a number 8 plug rather then the number 7 which would have allowed more boost before detention.
That said I was only able to get 7 psi boost but still ended up with 371 hp at the wheels on a mustang dyno. Not bad considering
BTW 1 degree more in timing gave me 9 hp

928mac

here is a bit of a video before the dyno tune

Lizard928

Where are you drawing the crankcase vapors from?

There is no way for the vacuum pump to draw 15" Hg at idle from the crankcase. If it is, this tells me that you still have the crankcase connected to the intake manifold somewhere allowing the engine vacuum to pull it down.

This also explains a good portion of why the oil is coming out so aggressively out of the air oil separator.
Contact me via email or FB and I can help correct these troubles you're having.

SeanR

Installed this set up on a customer from Florida's car over the past few weeks and even though I'm running this kit on my own car (4 years now) I can honestly say that any and all "bugs" that the kit had in the past are all worked through. Absolutely the most simple, easy and straight forward kit i've dealt with. Wish we had the time to get it on the dyno before he took it home but I've not driven anything that felt as responsive as this one, the power just kept going even with a very conservative tune.







Brad, are you running an oil baffle at the oil filler neck? I've been installing Greg Browns on all the cars I have the intake off and this makes a huge difference on the amount of oil slung up there.

928mac

With the new rear brakes and proportioning valve and sticky tires the burnout was not that good.
As you can see on that rough pavement both rear tires are getting equal traction

928mac

Well it is, and all the vacuum ports are blocked from the old PCV system.
Remember I had trouble with that pump at the beginning and had to take it apart and repair it. Maybe it is a different pump than you normally use or maybe it just works better. I tried two different gauges and connected them to the small port opposite to where the pump intake is on the oil fill.

928mac

yes. under the riser that comes with your kit.

Lizard928

Can you measure vacuum from the valve cover please?
The pump is the same 2 vane model as all the other cars are running.

It is always best to measure vacuum in the main crankcase area especially if you're running a scraper at the bottom of the filler neck. If the scraper is not an open flow through design but uses scrubbers that will create a huge restriction and can cause the problem you're seeing as well.

Even their larger VP104 pump cannot generate more than roughly 3" Hg crankcase vacuum when the engine is hot.

Ducman82

I had to remove my Kuhn oil scrubber (works great on an none vacuum system.) but creates a restriction on my pump. Need that free flow!

SeanR

Was it the one with the sos pad stuffed in it?

RennPartsDirect

This forum is a bad influence...

SMTCapeCod

Dyno sheets or its all placebo folks.

Just kidding. About the placebo part.

Now for cryin out loud will someone please come up with an adaptation of the S3 throttle quadrant?

928mac

I know i posted the dyno sheet somewhere, maybe it was the face book page. Im not home now and its harder on the phone

Ducman82

Pretty close Sean. Not a "scrubby" but stainless mesh.

928mac

Colin i will check at the valve cover and video it because who knows right.
Wouldnt be the first time i got fake readings