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Re: Call Korman anyway...Nothing to lose! (archive)

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Posted by RussC on August 01, 2000 at 14:45:47:

In Reply to: Call Korman anyway...Nothing to lose! posted by Phaedrus on August 01, 2000 at 13:48:13:

Hi gents,
Mine was the last turbo car to leave Dinans floor. Was done last Aug. through Oct. RobL is right, the gains from the low pressure turbo system is minimal. The Korman kit is just a massaged Mousellman kit. As you say, runs 5.5-6psi and probably a good fresh engine makes 250hp. If you add a IC, you'll still have to go to ignition/fuel mods beyond just the RRFPR or your asking for trouble. Putting higher pressure behind the stock size inj. is not ideal. Even with a IC, the system can still detonate above 6psi with only the RRFPR.
A E28 can be a real sleeper with the system though. I agree on the weight issue, to a point. The E34 ///M5 is 600lbs heavier than a E28 with turbo system, Mmmmmm....
Also, I don't think that were arguing the reliabiltiy issue, pressuming that the turbo system is WELL DESIGNED. That all.

'88 535is Dinan Turbo Final Edition

I would still call Korman. An intercooler is not a big deal to install if you are willing to do some plumbing. Volvo 240 Turbos ran without intercoolers and were extremely reliable, although they did give up some HP that would otherwise be available if an intercooler were used (the 740 Turbos which made another 20-30hp with virtually the same motor and same boost). Low boost turbos do not necessarily require intercoolers, but they don't have the HP potential that intercooled ones do.

The other reason why an E28 535i _could_ get away without an intercooler is that the boost is not only modest (5.5-6.0 psi) but also the compression of the E28 is only 8:1. The relatively low compression combined with modest boost makes detonation very unlikely. Intercooling would _still_ be a good idea...

From the performance perspective, my E28 535i (with 3.46 diff) will take my E34 535i to lunch any day of the week. With a turbo and some appropriate suspension and brake work, the E28 535i will make mincemeat of a stock or sharked E34 M5. The extra weight of the E34 M5 (more than 600 lbs when compared to my '85 535i) and the poor low end grunt of the M5 make it more of a autobahn stormer than a track car.

For my money, a turboed E28 535i would be the ultimate sleeper. Cheap to insure, cheaper parts (none of those $250+ sparkplug wires on an M5), and far more tossable on the track.

Rob's turboed M5 would be better still!

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