Tim Murphy

Actually, we are discussing raising the rev limiter to 7k or so, bringing the boost to 18psi at 5500rpm and then keep it at 18psi to 7000rpm. Anyone know of an easy way to raise the rev limiter?

heinrich

Well, here we (7k+RPM) are surely talking major oiling considerations?

Jim bailey - 928 International

GT chips .... 6,800 rpm

John..

The single turbo setup would be a breeze! Damn, I should have made some jigs to make the twin turbo manifolds and downpipes to fit a Garrett setup while I had it apart last summer. My conversion was $16,000 in 1983 with the two IHI turbochargers. In today's dollar, probably a lot more. I spent $900.00 on the charge cooler alone, but it is really nice, so money well spent. I will get photos of it soon on here.

Mine is under cover right now as I settle into married life. I have not turned a wrench on the car since two days before our wedding....honest. The last project I did was this weekend when I built a wooden structure to house the English and Irish Setters that will be shipped to our new place as soon as I get dog houses...are my car play days over?.....NEVER! Plans for the winter include a 930 S steering wheel and installation of the air oil separation device I have been wanting to do for the breather hose. I am done turning the power screw on this car.

I want to see a radical twin-turbocharged 928 S4. I know it can be done. I have even toyed with the idea of building an engine for those interested in Boostarding.

Any takers? I'll put together a Nikasil/ JE 2618 engine with suitable compression for running moderate boost. I have all I need to build a good 4.5 liter setup. You supply the compressor of your choice.

For those of you toying with the 4.5 L-Jet, let me know if you want any of the data on the MAF conversion. It is by far the best cash I have ever spent on an upgrade for the Bastard.

I'm running stock head gaskets on the car, going on the theory that if I don't have detonation, then I don't have a head gasket problem.

I can't believe Jim Bailey will now become a member of the Boostard Fraternity!

Tony

Its been done..im guessing we will hear about it soon enough.

Gretch

Yup. and they work.

Jim bailey - 928 International

Tony ..." Its been done..im guessing we will hear about it soon enough. "

some one just has to keep raising the BAR !! now who was the SECOND guy to fly across the Atlantic solo ?????

BC

....Uh, Tim, are talking about a cycling/blow off valve that will keep it pegged at 18psi and bleed the rest? I was thinking about that as you may recall a previous email I sent you.

I am also planning on a 7k rev limit. But I will be probably doing pauter rods for that reason. What do you have planned ofr your engine for the 7k?

Z

Nope. They're going to be using another method.

The last I heard, none of those guys had any plans to change from the stock rods that they have now. At least not in the immediate future.

Fastest928

a nice electronically controlled waste gate is the way to go.

Marc

BC

Do tell on that other boost controlling method?

On the rod issue, aren't all these guys the 87 years? Meaning they have the beefier rods? Or is there just no concern at 7k about a rod flying apart?

I think at least that better bolts would be the norm (rod) and to have that done, and the subsequent resizing of the big end because of the distortion caused by the pressing in of the new bolts would be near the cost of some pauters, no?

Tim Murphy

Brendan, the boost contolling method hasn't been done yet so there really isn't much to say at this point, just some wild ideas that we are playing with.

As far as the high rev engine, the rotating assembly will get completely redesigned with a modified crank, custom pistons and rods. I don't have the calculations right here (I'm not the one doing the calculating) but the figures so far show no more internal stresses than a GTS motor spinning at 6400rpm. I think that was even using 7800rpm in the concept design.

BC

How are you modifying the crank? A bit more throw from cutting down the journal to a smaller diameter? The reason I keep on talking about pauter is because they are 1800 with bolts. Thats pretty much what would be spent doing anything to the crank to make "Cheap" Chevy rods work.

So your saying that rod stress at 7k on a 18psi 5L 928 engine is no more then the GTS at 6400? Can you clarify that for me?

Thanks.

ALso, When I called Cometic, they said that they can do alot of different thicknesses on the gasket, so thats just an FYI for someone looking for a quick crank down on compression points.

John Speake

Tim,
It's easy to remap the rpm limit to 7k. Or whatever you need.

mspiegle

anything pre '87 (inc. 86.5) has weaker rods?

Does anyone know of a boosted 86.5 with a stock motor?