Carl Fausett

Q: from Andy - was it 8 psi or 7?
A: the kit comes with what is referred to as a "8 psi pulley" by name. That is what I wrote on the dyno sheet. The 7 psi I referred to is what I observed on the boost gauge at 6,000 RPM. The difference? The boost gauge reads vacuum (about 20") at idle and low throttle, gradually turns to boost as the SC overcomes engine vacuum with boost. So the boost gauge is displaying: SC pressure output minus engine suck equals what's left.

Q: from Marc at Devek - "just like a stroker..."
A: ...accept 1) my customer went home 14 days after dropping it off, and 2) with a small box of parts in his 928 hatch that holds everything he needs if he ever wants to turn the car back to stock. And, 3) at $9,000 (he paid $7500 for the kit and I charged him $1500 to install it) - yeah, I guess, except for 1,2 and 3 above - yeah, it's just like a stroker.

One of the biggest benefits of this kit (and our 928 Motorsports kits, I might add) is that it is non-invasive. The stock manifold, stock exhaust, EGR system, even the stock fuel system, does not have to come off. Non-invasive and non-destructive. No permanent changes made - a true "bolt-on" of 120+ HP (140 in this case).

Carl Fausett

My cellphone just rang - it was Joe - he's half-way home to Chicago in his SC GT. He called from the car... "this is a whole new car!" he spouted... "I've had my foot in it all the way here and it's just wonderful!" he gushed.

I also had installed a billet short-shift lever for him and he loved that too. Much tighter shift pattern - even when compared with the GT shifter that he had. And we replaced his cracked fibreglass piece of sh#t belly pan with the new aluminum one froom 928 Intl - that is a real nice part also.

I swear - I could hear the grin in that man's voice from here.

Joe will be hooked up on the GLOC shortly - he did not know any other 928's around... we'll take care of that. He's a nice guy.

Donald

Carl-
It's the "tune-intake flap" harmonic (Helmholtz Resonator principle) resonance, starting in 1987 (?). I do not know what the specs say for activation rpm, but it seems to be around 3,500-4000.
My thought is that the opening of the butterfly will affect manifold pressure and possibly create a series of pulses. Just a thought.

Carl Fausett

Actually - this is the MOST fun... I got a new Porsche magazine in the mail with this ad for the 2005 911 Carrerra... (now enhanced)

Carl Fausett

Donald - that's a good suggestion and I think it has merit. But - when we leaned it out to 12:1 air/fuel ratio we saw the squiggly lines all but disappear entirely - si I would have to think it was not the tune-intake-flap.

Again, the Dyno operator said he had seen this on other cars when they run richer than 12:1 (including turbo's too he said) and he was not surprised by it at all. It did not appear in the 3rd gear pull, and only re-appeared in the 4th gear pull when we had richened it to 11.5:1

GoRideSno

I hear ya Carl. Those are all big benefits.
My system does all that too except for the manifold. I even use the stock fans on 87+ cars. I've done a complete install from stock by-myself in 12.5 hrs then drove the car x-country, LA to Atl in 36 hrs.
I wouldn't call taking up more space in the engine bay non-invasive though.
As far asnot removing the stock manifold, are you not suggesting installers replace their knock sensors before the install, i.e. remove the manifold and re-install it?
If you have the stock manifold off why not replace it with one that is more sutiable for forced induction. Something like the Vortech Mondo aftercooler that replaces the runners of stock Ford manifolds with an intercooler. Ideally one would have a manifold that is lighter than stock, has an integrated intercooler and supercharger, the whole assembly would take up less space than the stock manifold, and place the weight of the SC and IC behind the front axle. Mine does all that

No permanent changes? There is no hole in the washer reservoir, no holes drilled in the fire wall to mount the FPR? Awsome!

Stock fuel system? I thought Tim's kit removed the stock injectors and FPR and replaced them with aftermarket parts?

Non-destructive? What's that all about?

I'm looking forward to meeting you at Sharktoberfest.

Andy K

Jim_H

That is a huge benefit to your system Andy and "1" of the main reasons I went with your system

Tim Murphy

Excellent job on the install Carl!!!! Thanks for calling me after Joe called you from the car, I LOVE hearing about the first impressions. Sounds like we have a very happy customer.

I see that there are other questions/ comments and I look forward to providing my thoughts but right now.... "be right there honey!!!".... I have to run.

Once again Carl, it's great to have you part of this venture, thank you!

I will be back tomorrow.

ErnestSw

DROOL!!!!!

sonny1

For what it matters,I'll go for the supermodel,a more professional aproach to it.,cheers,Sonny.

Tim Murphy

Andy, maybe it's just me but your post comes across as being slightly defensive. I guess I'm not sure why you feel it necessary to defend your system whenever someone is talking about the centrifugal systems.

Carl's comments about my kit being non-destructive, non-invasive are his opinion (and mine) of installing a Murf928 kit. I don't believe he was making any reference to the design of what you are providing. I know very little about your system and I believe that to be the same for Carl. His comments are not directed at you so please don't take them that way. I am sure your system is very nice and your customers are very happy with what you provide to them.

The point that Carl was making is that we have spent a lot of time making these kits as complete and thought out as we can. My kit is designed for stock parts to be removed from the car and then replaced with parts provided with the kit. I'll repeat what Carl said, there is no requirement to make any permanent modifications to the car to perform a Murf928 SuperShark installation. This allows the customer to put the car completely back to stock form if he/she so desires. Honestly, there may be more value in the car and the Murf928 kit as separate items if someone wanted to sell their car. Maybe some day this will change.

Andy, you are correct about not having to put a hole in the washer reservoir, my design doesn't require that. We suggest the customer mount the SFMU to the firewall by drilling two 1/8" holes. If someone doesn't want to go to that extreme we will be happy to work with them to provide another solution.

My instructions do not require you to remove the manifold but if you did have the manifold off the car, there are some well documented maintenance items that should be addressed such as replacing the knock sensors.

You have a great idea with changing the intake manifold to a design with the intercooler built in. Since I have developed a system that works well with the stock manifold, changing it would be an unnecessary expense as well as a lot of additional work.

Congratulations on driving from LA to Atlanta in 36 hours, that's quite an accomplishment.

Tim Murphy

I agree Marc. Just last week I was studying the dyno sheets from your website and comparing them to stock S4 and SC'd cars. This makes me excited for the 6.1 liter engine I am in the process of building that will get supercharged. 9:1 compression and 1 bar boost should make for an interesting ride.

Tim Murphy

That's a good question. The dyno I use was having that problem and it turned out to be static electricity that was generated from the car on the rollers. This dyno now grounds the chassy of the car and the problems apparently have gone away. Since Carl said they leaned out the car a little and the lines smoothed out kind of throws my initial theory out the window.

Tim Murphy

Carl, it's great to hear that you are presenting at Sharktoberfest!! Perfect timing to have just completed a Murf928 SuperShark installation. This should make you very well versed on all 928 model years with respect to centrifugal supercharging. With your knowledge and Andy's knowledge on the twin screw systems should make for a very informative presentation for all in attendance.

Andy, typically we see about 20 RWHP per pound boost with my kits. This has proven itself time and time again. If Joe's car showed a 140 RWHP increase I would expect to see about 7 pounds boost on the gauge.

Tim Murphy

BTW, for those of you that might be interested I am just finishing up what we will call a stage one kit for the S4 and later cars. Right now it is all just theory that it will work but it sure looks pretty nice so far. This kit should put out about 100-120 RWHP, install in about 4-5 hours by a true novice mechanic, and cost less than $4900. You will be able to remove the sc belt and the car will be 100% emissions compliant. When the time is right I will start a new thread with pictures, before and after dyno's, and all the details.

More to come very soon.

Now, I have to get off this computer and get back to work!!!