Huntley Racing

The entry level Stage I 944 S2 kit at only 5 PSI of boost makes a tremendous 280 HP and 250 TQ at the wheels!! This is 336 HP and 300 TQ at the crank!! That is well over the 100 HP improvment we were shooting for! This is far greater than we had predicted but a welcome surprise! The very low boost assures a tremendous amount of reliability and longetivity. The system is completly 'plug and play', no customer tuning required. The kit includes not only the supercharger system but the additional conversion to MAP sensing injection which is the ultimate for low restriction induction. The Stage II results will be out next week but will easily top 300 HP at the wheels. The efficiency of these systems is evident with the percentage of gain at such low boost levels. All of this performance has no dowsides. You don't have to kill the resale value of your car by having to remove the A/C or any other onboard system to run our kits! The car is not permanantly modified in any way! The 968 and 944 S kits will be done very soon! The 944 N/A will follow. Anyone who wants the chart before it hits our website may e-mail me for a copy. So why am I posting this to the 928 list? Because we are looking for interested parties to make a line of kits for the 928's! Let me know if you are interested!

Randy V

This sounds awful 'spammy', but we'll let you play through.

huntleyracing.com

Let's talk specifics for the 928: 16 or 32 valve engine application; plans for a complete turn-key system; ease of installation; price.

Chris Lockhart

I'm with Randy. Need more info on installation ease, complete kit or piece together yourself (like the other one on the market), and rough price. Sounds very interesting though. Wish I was close enough to provide an R&D vehicle. (for a greatly reduced kit price, mind you---lol) Please keep us informed.

Huntley Racing

Sorry for the sapm but it is in the interest of making 928's a lot faster!! The kit would have it's own manifold which allows the supercharger to live in the center galley between the heads. Though not as simple as an external centrifugal supercharger the positive displacment EATON woulf make boost just off idle and continue to redline. Additionally this would allow for the stock manifold to be retained for future return to stock if nessesary. At onlt 5 PSI of boost this system would make 40%-60% more HP than stock and at 7PSI-8PSI would make close to 90%+ more HP! The injection would be modified by converting the air metering to MAP sensing which would be a 'plug and play' that requires no customer tuning. In driving a 944 S2 we supercharged at only 5PSI of boost I can tell you a 928 would be a Viper killer! The 944 S2 is making more HP than a 928 GTS out of a 4 cyl!

John V

Interesting post!

I was particularly intersted in the MAP sensor conversion as I have been toying with trying this on my '81 (L-Jet) just as a means of getting better intake flow. I have a couple of concerns:
1: Our current flow meter incorporates the fuel pump switch that keeps the pump on after start-up. Would that system be defeated all together or would you find an alternate method of keeping the pump on while driving and turning it off in the absence of air flow?
2: Since the charger would alter intake pressures (and thus fuel pressure), do you think that the resulting higher fuel pressure would provide enough fuel with the standard injection maps for part throttle operation? (This is more a factor for older cars that can't have the chips reworked)
3. As Randy aptly pointed out, cost and level of kit comleteness are keys factors for me.

I'd ike to know more.

Incendier

...as will the AFM to MAP conversion. Their (web page listed) conversions start at $1,195.00, plus supercharger, plus plumbing, plus all the misc. bits. Yipes. Bad to own an early shark.

Also, though it would be wonderful to remove the air-blockin' trap door, conversions of this type tend to have huge compatibility problems with the existing electronics. And I'm loathe to give up my beautiful spider in place of a sheet-metal intake manifold, even for an extra 120hp...wait a minute...

Jim Nowak

Huntley Racing,

I'm in the process of converting my 928 to an Electromotive Tec II system. I'm utilizing a MAP sensor on that system. If plug and play is already there, what is the price for installation or kit?

My 928 is a two-valve 5.4L with J&E pistons(104mm), Devek cams, 944 heads, Euro S Extrued Honed induction, Jet Hot coated headers, Devek radiator, S4 cooling fans, etc, etc,.....

How would the supercharger run with the high-lift cams and 10.4:1 compression?

Jim Nowak

John Welch

I have an '82 928 that I could part with for a month or two. Are you guys going to be addressing the 16v engines? If so, give me an address, and I'll have the car sent over!

John Welch
'88 951
'87 928 S4
'82 928

Jay Wellwood

Hmmmm....unless I see more proof in the pudding - I am skeptical at best. Mere claims of increased output at the returns advertised are whimsical at best IMHO.

Huntley wrote-

'At onlt 5 PSI of boost this system would make 40%-60% more HP than stock and at 7PSI-8PSI would make close to 90%+ more HP!'

Show me the beef and then we can talk. These numbers just don't add up to my meager experiences. Again - show me the beef!

Mike Schmidt

I think that those numbers may be a little optimistic. At 7psi-8psi you'd be at aproximately 50% more pressure and air going into the engine. A 90% power increase from only 50% more air would be interesting to see. I helped do some tuning on a supercharged 928S4 that was making 8psi of boost. That's about a 50% air increase again, and the power increase at the rear wheels was around 52%.

onthedge928s4

I`M LIKING THE IDEA .
HOW MUCH IS IT GONNA COST$$$$$$
i SAY YOU BUILD IT AND THEY WILL COME AS LONG AS IT`S WELL BUILT RELIABLE AND FAST
i ALSO HAVE A 88 S4 WITH A/T I WOULD GLADLY DONATE FOR A PROJECT AND KICK IN SOME CASH FOR THE CONVERSION. MAUVE WITH 75K.....

Randy V

I admire your enthusiasm Roberto (no need to shout though - try it without the caps-lock).

I'm wondering if they'll pay to ship your car from Joisey out to the left coast .

DaveW

If a 944 engine is basically half a 928 engine how come the tuning potential of a 928 seems to be lower (as a % increase) than the 944? There seem to be many racing/tuning shops tweaking 944's into the 300-350Hp range so why don't we see 600-700Hp 928's?

Sorry if it's a dumb question.

DaveW

Huntley Racing

Interesting post!
I was particularly intersted in the MAP sensor conversion as I have been toying with trying this on my '81 (L-Jet) just as a means of getting better intake flow. I have a couple of concerns:
1: Our current flow meter incorporates the fuel pump switch that keeps the pump on after start-up. Would that system be defeated all together or would you find an alternate method of keeping the pump on while driving and turning it off in the absence of air flow?

>>>We would run an additional output from our 'black box' to turn the pump on and off as stock.

2: Since the charger would alter intake pressures (and thus fuel pressure), do you think that the resulting higher fuel pressure would provide enough fuel with the standard injection maps for part throttle operation? (This is more a factor for older cars that can't have the chips reworked)

>>>All the cars will require more fuel pressure as well as mapping changes which means the early CIS cars are going to need a complete injection change.

3. As Randy aptly pointed out, cost and level of kit comleteness are keys factors for me.

I'd ike to know more.

>>>Cost is unknown just yet but likely in the $6000-$7000 range for a complete bolt-on kit.

Huntley Racing

Huntley Racing,
I'm in the process of converting my 928 to an Electromotive Tec II system. I'm utilizing a MAP sensor on that system. If plug and play is already there, what is the price for installation or kit?

>>>Unknown, but $6000-$7000 or so complete nut in your application a bit less since the electronics are not needed.

My 928 is a two-valve 5.4L with J&E pistons(104mm), Devek cams, 944 heads, Euro S Extrued Honed induction, Jet Hot coated headers, Devek radiator, S4 cooling fans, etc, etc,.....
How would the supercharger run with the high-lift cams and 10.4:1 compression?

We would have to be carfull of the boost levels and programme the TECII to pull out timing as the boost builds but even at 5 PSI the car would make 50% more power and we could likely run more like 7-8 PSI for closer to 70% gains.