Not a rolling exemption , that was killed.... Unless you change the intake it is like breathing through a straw...put in big cams and the low end torque goes away but the intake restrictions will kill the top end. What you propose has been done many times before...and no doubt will be done again and again. Is this car a 5 speed ?

 

Also no sunroof!

 

There was a time when people who had large amounts of unreported cash income and no credit would replicate later model Porsche cars because if they went into a car dealer and paid CASH for a new one the dealer is REQUIRED to report large currency transactions. But small repair shops / body shops would happily accept the cash and say nothing since they too often had no intention of reporting that "income". It was also standard operating procedure to use parts from questionable sources but at a great price ! Some of those same people would go on an all expense paid government sponsored "holiday" often their vehicles would be impounded and towed or abandoned ....ending up parked

 

When you say intake, are you referring to the spider setup? Are the euro models a larger diameter? I'd either grab a euro setup, or have a friend fabricate me something to replace the OE spider. Ideally a 1-piece unit, but I'm not sure if it's feasible or not without looking at it closer.

I'm sure my ideas are nothing new...but I was told the same thing over and over by the 944 camp, and I ended up making 16V power in an 8V with very little money spent (I think I had ~1200 into the engine mods, including a clutch and 7-lb flywheel). People get so used to hearing the "same old thing" regarding mods that nobody bothers thinking outside the box.

If the same holds true for this beast, I don't see why 300hp can't be had in the 4.5L relatively easily and cheaply (the only caveat being cams, which will run close to $1000).

Let me know about the intake, though...I'm curious to know what the choke points are!

PS...Jim, you're in Anaheim? I'm right near Disney. Perhaps you could show me one of your 928's so I get bit really hard by the bug?

 

Monday -Friday , 8 to 5 come by early next week and see two 500+ hp 928 racecars and a bunch of junk.

 

Yes, the Euro "S" intakes have larger openings in the plenum chamber and intake tubes. (Yours is CIS injection, so be careful which one you buy as there is a difference between CIS tubes and L-JET tubes).

The heads have larger ports, the cams are bigger, the throttle body is bigger, compression ratio is higher, etc.....

Hence, you go from 234hp (US) to 300 and up (Euro).


To take full advantage of the Euro combination, you will need the heads, cams, intake (tubes and plenum), and throttle body. your compression ratio will have some impact on power production, but higher CR's require higher octane.

As for replacement of the spider intake, you could pursue the sheetmetal fabbed route, or step up to an individual throttle body set up. Porsche invested a lot in the tuning of the spider intake for various conditions. Any deviation from that may cause your engine to suffer where you don't want it to.....


--Russ

 

I'm sorrty to inform you, but you are far too smart to own a 928.

 

LOL! ...thanks?!

I'm sure it would be fun...I saved a dyno of a 1979 4.5L 16V with a non-intercooled S/C @ 6psi. No other mods on the engine at all. It made 190 rwhp stock, and 261 rwhp with the Stage 1 (6psi) blower on the K-Jet. The kit costs about $4650.

It seems to me I could gasket match and shave the heads, throw on a Euro S spider, get a set of cams, convert to electronic fuel injection with Megasquirt and a nice 3" exhaust and get about the same horsepower for $2600 or so...judging from the research I've done so far. True, it won't have the same TQ as the FI car...but it's a V8 anyway. I'm not too worried about it.

This guy has a GREAT writeup on converting a 1980 MBZ 450SL to EFI via Megaquirt...it's stupid easy and very cheap.

$2600 or $4600 for the same power output. Hmmm... Then that leaves the extra money for suspension work.

I would think 300 would be plenty fun in this car. Give it a little diet, aim for a curb of ~2900 or so and it would keep me entertained.

All you guys talking about $6k here and $5k there are nuts. If I had that kind of money to spend on a Poorsche, I wouldn't be buying a 1979 928!

Thank you all so much for the help so far. To say thanks, I will re-subscribe to the 'List as soon as I bring the new toy home. You'll be seeing more of me!

 

Let me say this... if I look back at the last 8 years, the cost of maintenance plus my original purchase price (PP) total 30K.
And I started with a 300hp+ Euro!
...and I still need a new tranny.
...and a new paint job.

My first 928 was a 4.5L US. I tried to build more power into it while restoring the car (rolling). Within 1 1/2 years, I had 12K into maintenance, plus the 6K PP. I only got 20% increase in power. Nobody never said I was smart.

What my point? Buy a 928 that fits you power needs first. Buy a 928 only if you are prepared to dump alot of money into it.