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Old 04-26-2006, 10:58 PM   #1
Mitch555
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E36 325 Engine Turbo'd With 8 PSI... Fast Or Not?

Need some input on this guys. Would you say it would be fast or meh... not really? I know there is other aspects like diff... tuning... piping... tires... blah blah blah... but generally speaking. Car is 5 speed also. This setup will be in an E36.
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Old 04-26-2006, 11:28 PM   #2
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will it be fast? in a word yes. your car would be as fast if not faster than my car.
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Old 04-27-2006, 12:08 AM   #3
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Quote:
Originally Posted by Furious
will it be fast? in a word yes. your car would be as fast if not faster than my car.
But you have a S50 (240hp/225Tq) and a supercharger at 8 psi, and I will have a (189hp/181tq?) . You have more engine power to begin with. How would I be same/possibly faster? Is it cuz the supercharger is belt driven and you loose hp that way? Do explain PREEZ!
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Old 04-27-2006, 03:38 AM   #4
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Quote:
Originally Posted by Furious
will it be fast? in a word yes. your car would be as fast if not faster than my car.
It wont be a here is a proof

SC M3 8psi (ODBI)

282.6 HP @ 6500 RPM
262.4 Ft-Lbs @ 3750 RPM


Turbo M3 at 8.5psi (ODBII)

300.5 HP @ 6750.0 RPM
286.9 ft-lbs @ 3250.0 RPM


Turbo M3 at 7psi (ODBI)

284.8 HP @ 5750 RPM
288.2 ft-lbs @ 4250 RPM



EDIT, for some reason, I thought you were talking about 6psi on MSN when I said it will be somewhere in between e36 m3 and e46 m3 fast.
With 8psi, id say as fast as e46 m3, maybe slightly faster. But no, it wont be as fast as 8psi SC S50
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Old 04-27-2006, 12:19 AM   #5
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General rule of thumb is 10% performance loss with a supercharger.
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Old 04-27-2006, 12:22 AM   #6
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Quote:
Originally Posted by Justin e36
General rule of thumb is 10% performance loss with a supercharger.
exactly, the efficiency of a turbo really does make a huge difference.
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Old 04-27-2006, 12:30 AM   #7
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Turbo design and effiency has come along way and all the old lag issues have been hugely reduced. Turbo matching is the key to any turbo application. Most fools sorry, certified idiots spend tons of money buying and installing a huge 500HP turbo on their car thinking it will produce 500HP. They dont realize that it will only deliver 50HP by the time the poor engine was reving at 6K to get it to begin spooling.

With a well matched turbo, you can have "almost" no lag, been there done it.
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Old 04-27-2006, 03:31 AM   #8
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Quote:
Originally Posted by Justin e36
General rule of thumb is 10% performance loss with a supercharger.
please elaborate on this statement...
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Old 04-28-2006, 12:57 AM   #9
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Quote:
Originally Posted by Justin e36
General rule of thumb is 10% performance loss with a supercharger.
Correction, on a centrifugal supercharger. Positive displacement blowers are a lot more efficient, which is why Mercedes, VW, etc, etc have used them.

Even a turbo requires power to spin the turbine to create boost, obviously no where near as much as a belt driven compressor though.
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Old 04-29-2006, 07:51 PM   #10
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Quote:
Originally Posted by thinair
Correction, on a centrifugal supercharger. Positive displacement blowers are a lot more efficient, which is why Mercedes, VW, etc, etc have used them.

Even a turbo requires power to spin the turbine to create boost, obviously no where near as much as a belt driven compressor though.
Correction noted.
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Old 04-29-2006, 08:05 PM   #11
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go for the turbo 325! if you do your setup like an aa kit you could get tuning from them. your other option is a standalone ecu like the tec3. 325's have lots of potential. just the other day on bf.c there was a turbo 325 that made over 400whp at 18psi with 91 octane and a .140 cometic headgasket. i think it was with a sc-61 turbo.
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Old 04-27-2006, 01:05 AM   #12
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Quote:
Originally Posted by Mitch555
Need some input on this guys. Would you say it would be fast or meh... not really? I know there is other aspects like diff... tuning... piping... tires... blah blah blah... but generally speaking. Car is 5 speed also. This setup will be in an E36.
To answer your question 8psi on your car with a properly matched turbo and components will be more than you can ever imangine.
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Old 04-27-2006, 04:22 AM   #13
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hard to say, thats only AA's SC, there are other options out there, i mean really we cant compare unless we know exactly what turbo and setup he plans to run. 8 psi is just a number without knowing the size of the turbo and its components. i think he would be just as fast if not faster than an e46M3 im pretty sure my car is faster than one.
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Old 04-27-2006, 04:54 AM   #14
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Quote:
Originally Posted by Furious
hard to say, thats only AA's SC, there are other options out there, i mean really we cant compare unless we know exactly what turbo and setup he plans to run. 8 psi is just a number without knowing the size of the turbo and its components. i think he would be just as fast if not faster than an e46M3 im pretty sure my car is faster than one.
Yeah I know psi alone doesnt mean anything, but we are talking about basic kits here on a stock engine, and if you compare AA, RMS, Dinan, VF, ESS etc kits, results are very similar.
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Old 04-28-2006, 12:54 AM   #15
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Well... The turbo I am most likely gonna run is a KKK-27 (rebuilt) from a Porsche. It should spool up around 3000RPM. I was told it should be about 250rwhp and should be able to keep up with E46 M3's no problem... and it might even be faster.
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