James Bailey

I have often wondered what the A C Bristol and Ace club guys thought when Shelby stuffed a 289 into THEIR favorite car ??????

Landseer

Here, just buy a new generation Corvette.

xschop

Try doing this to the 928 engine at this budget.....

http://www.superchevy.com/technical/...age/index.html

xschop

Also the GM piston slap was fixed from 02-on IIRC.....Bore matching at the factory was strictly adhered to.
I've got an LM7 5.3L from an '03 in my 948 and has NO piston slap running regular dino oil. I have another 5.3L bare block and just got my 4.8l pistons and rods in perfect shape for $75 for my ZO6 headed ($400) compression bump as well. Basically I'm building this motor for less than $1500.....top this with a 928 build......

http://www.pro-touring.com/forum/sho...445-tq...-woot!

Hilton

Er.. 440hp on an engine dyno? Or am I missing something here?

For a 928 S4, spend $8k on a stage III supercharger kit (includes everything including ecu chips and injectors) and put down 500rwhp.. seems like it easily fits within the budget to me?

If you mean modified stock displacement NA, thats not very expensive with a 928 engine either.. using new cams and headers can get to 380rwhp (about the same as the 440hp engine dyno result) - see this thread here:

https://rennlist.com/forums/928-foru...and-video.html

Yes, he spent some $ on oiling modifications for track use, but really not needed for street driving.

I'm not saying SBC conversions are bad - just that if you're after cheap power, they're not always the best alternative for a 928 owner.. especially factoring in the other stuff needed like ECU integration or replacement and rewiring etc.

Tony320

Ideally I agree, supercharging the 928 motor is going to be the preferable route. That said, with a high mileage, suspect, or just plain uncared for 928 the motor itself will likely need to be rebuilt before it can take a supercharger. Maybe I'm wrong, it happens often, but I think that the idea is that a built gm motor and xs kit appears to be a less expensive option than redoing the 928 motor and then bolting on a power-adder.

To be honest I'd much prefer a twin-screw intercooled setup on a euro 16v, but I can't blame a guy for opting for a gm small block.

Hilton

Completely agree that the basic maintenance items will need to be done, like an intake refresh and timing belt job. However there are plenty of boosted 928's running around on original head gaskets - alusil is extremely hard wearing and rebuilds aren't something that are generally needed unless the engine has been abused on the track or used the wrong oil. As long as it gets basic maintenance, 200k miles isn't much on a 928 engine in terms of wear, other than the usual replacement of leaky gaskets/seals (i.e. don't need to remove heads, replace rings etc.).

If compression checks out then chances are the motor is good to go for boost (remember boosted 928's don't run crazy high boost - compression prohibits it).

My point was more about the $40k budget from the previous post.. for that money you could buy two 87-89 S4's, do the intake refresh and TBWP jobs, and fit superchargers to both of them.

If someone can rationalise spending that money to end up with a 440 crank-hp motor in a 928 body, then thats up to them.. but for that kind of money you're talking a Greg Brown stroker or alternatively boost plus serious interior upgrades (full leather Champagne interior?). At which point a mere 440hp seems laughable, without even factoring in the inability to re-sell the car later.

Imo000

I'm around 400crank hp on my 32V, and it only cost me $1000 > if you can turn a whrench, you can do some really neat $hit with the 928 engine for not a lot of money.

blown 87

From every one I have talked to it is going to run 20 grand to put any kind of SBC in a 928.

For some one like me who has done a lot of engine conversions and has a well equipped shop, the basic work is not going to be a problem, but the little things always take a ton of time, things like Gauges, cooling issues, throttle linkages.

For the poster in question who threw out the 40,000$, keep in mind he said that the GM HVAC systems were bullet prof, for such a great system we sure work on a bunch of them.

Bottom line is you are still going to end up with a car that most folks wont want, few, if any shops are going to touch, it is just a bastard car.

All that being said, the call of a LSx engined 928 does call me, and I have a extra 928 laying around.

IcemanG17

seriously no matter how you "add it up" no 928 engine can match the HP of a chevy unit dollar for dollar, boosted vs boosted etc...... 928 engines are flat expensive.....

For example a professionally built 928 stroker engine will run you around $30k and could make 600hp (crank)....vs say $15k-20k tops for a built LSX engine that can make silly hp....1500+

Tony320

hehe point well taken.

whiteNSXs

There is really no right answer when it comes to hotrodding the 928. Different people have different desires. Many argue that the 928 engines were not meant to be supercharged. I, in the spirit the OP, just looked deeper into the GM options. The stroker engine is even more expensive and I am sure the original builder will not recover most of the expenses when it comes to resale. Then again, if one worries about resale values, then hotrodding is a BAD idea to start with. The idea of modding any car can only be understood in a personal level. That's why we have "custom" shops catering to particular needs. I have no idea how much Sterling Gee spent on his car, but likely WAY more than he can recover if he ever wants to part with it. I know my $40k concept made you roll on the floor laughing your *** off, but nonetheless it is a valid option for SOME people. For me, I would be very scared to drive a supercharged 928 with the fear that the engine might blow up. Different strokes. My black NSX was supercharged and everyone loved that car. However, all of these people thought I was crazy to even THINK of supercharging the white one since it is a one of a kind.
Steve

xschop

I'm still at a loss on a $40K pricetag for a GM928. I've already posted that I have less than $4k in my 5.3L 948 (340 HP) I am in the process of building that same high comp motor with all off-the shelf parts for $1500. That being said I just went with my buddy yesterday to pick up a 6.2L all alloy Escalade motor for $2200 with the wiring Harness and 26K on the odo! Wiki's got it down for 403 HP right out the box. Knowing him he'll have it up to 600 HP with bolt-ons and a tune for another 2 grand.

Also I will mention that I designed my own swap parts for the 948 and will do so for the GM928. But the 928 is a cakewalk to swap compared to the 944....Brakes are there, The vacuum booster can stay, Radiator will work just fine, maybe spend $300 on an upgrade....And wiring can be done for $500 with the tune (the 948 cost $400 with the tune from SSP and I ran my own fuse blocks & relays....$50 )
A $300 set of long tubes can be reworked easier than the 948 swap too..... I'm still scratching my head to get to a $10 K swap even if I had to buy a kit.

Landseer

I'm sure you can make it work and will do so inexpensively.

The whole concept is seeing somebody wearing navy suit with brown socks.

A 32 ford with a 350 instead of an old hemi with ardun heads.

Just an outlier of sorts.

xschop

Yeah, most folks are not mechanically inclined to do a swap with kit in hand.
I ruined alot of old shorts and T-shirts this summer doing my swap under the carport.....too hot for Navy jump suits and bobbi socks LOL
UPS is here....hope it's my Comp cam and springs