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Old 09-06-2005, 07:58 PM
  #16  
m21sniper
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"There is alot of mystery about turbo matching to motor/rpm - don't laugh at the guy."

That's why god invented compressor maps and simple algebra.

It's probably also why he invented Corky Bell's book anout the theory of turbocharging. I highly reccomend it, it explains all of this in pretty good detail.

That turbo in the picture looks to be blatantly too big for a 4.7 or 5.0 liter displacement engine. I think it will be found that spool up won't even occur until at least 3500rpms in that unit, with full on boost coming well after 4000rpms.

Of course at that point you better find something to hold onto and hope yer strapped in tight....
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Old 09-06-2005, 07:59 PM
  #17  
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double post.
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Old 09-06-2005, 08:04 PM
  #18  
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"IMHO, id leave any turbo in the mirror."

Sorry tony, but turbos are by far the superior boosting method.

Go find yourself a mildly worked Supra or Buick GN and see who pulls who.
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Old 09-06-2005, 08:18 PM
  #19  
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Originally Posted by m21sniper
"IMHO, id leave any turbo in the mirror."

Sorry tony, but turbos are by far the superior boosting method.

Go find yourself a mildly worked Supra or Buick GN and see who pulls who.
Yep I put a few of those in my mirror as well.


Twinscrew Whipple is the only way to go!
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Old 09-06-2005, 08:29 PM
  #20  
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Originally Posted by m21sniper
"IMHO, id leave any turbo in the mirror."

Sorry tony, but turbos are by far the superior boosting method.

Go find yourself a mildly worked Supra or Buick GN and see who pulls who.
Im referencing a 928. Thats what this forum is, I guess I should have specified.
In other words im poking the stick at the turbo guys to get some thing on paper..either dyno..or performance wise. Its getting old. Tme to put up or shut up ..all in good fun.
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Old 09-06-2005, 09:11 PM
  #21  
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The oil inlet to the turbo is pressurized but the return is gravity feed. If there is any crankcase pressure during boost it could cause the drain to stop flowing and the oil in the turbo bearings to coke. Porsches fix was to T off the return line with a secondary to the oil separator. This will allow the oil to continue draining if the crankcase is pressurized. BTW on the 928 the oil separator is the cannister that is used to add oil. If you have a Pet 5 or later you can see a picture of the T'd return line for the 924 turbo (81 and GT's).

Dennis
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Old 09-06-2005, 10:20 PM
  #22  
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"Yep I put a few of those in my mirror as well."

There's quite a few 700, 800, 900, and yep- even 1000hp Supras and GNs around.

How many supercharged 928s you ever seen put out power anything like those figures? And both the Supra and GN are six bangers to boot.

There's a reason Turbos are banned from top fuel you know.

Turbos are just demonstratively more efficient than belt driven SCs of any type, and dat am be a fact.

Heheheh, this is almost as divisive a topic as 9mm vs .45.
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Old 09-06-2005, 10:21 PM
  #23  
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"Im referencing a 928. Thats what this forum is, I guess I should have specified."

Just keep in mind in the future that im a dumbass.

"In other words im poking the stick at the turbo guys to get some thing on paper..either dyno..or performance wise. Its getting old. Tme to put up or shut up ..all in good fun."

Don't worry, i'm just stirring the pot a bit myself.
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Old 09-06-2005, 10:29 PM
  #24  
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Tony - I think you need to go to school.
I'll give you a headstart, and if you have enough time to read my license plate when I blow your doors off - you win.
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Old 09-06-2005, 10:49 PM
  #25  
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Tool, I dont doubt that your 944 will beat most any 928 turbo, as i have a 951 also. IMO a 450 hp 951 would smoke a 600 hp 928 any day mostly due to the weight difference.

I dont think I really need to go to school though. Already done that.
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Old 09-06-2005, 10:50 PM
  #26  
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Oh sorry, I just noticed you said Tony.
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Old 09-06-2005, 10:51 PM
  #27  
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tammons, I think he was refering to this...
Originally Posted by Tony
IMHO, id leave any turbo in the mirror.
edit - which it appears you have noticed.
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Old 09-06-2005, 11:09 PM
  #28  
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"IMO a 450 hp 951 would smoke a 600 hp 928 any day mostly due to the weight difference. "

A 944 would have to be in the vicinity of 2000lbs lighter than a 928 to make up for a 200hp deficit in the power to weight ratio department.

100lbs is the rough equivelant to 10hp.

A 600hp 944 would be wickedly fast no doubt, but a 800hp 928 would be considerably faster in straight lines and top end.
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Old 09-06-2005, 11:15 PM
  #29  
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3rd gear is a beast on the 951's any amount of power extra given to the 944. makes it a really hard car to beat in it sweet spot. i've seen some 400hp 951 catch plenty of supra's off guard. but one the fat bully's turbo spools up better shut down b4 he chases you down. i'm sure if the TOOL punch it on a supra and catch him off guard the supra would have a long time trying to catch him
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Old 09-06-2005, 11:21 PM
  #30  
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Yes, I agree 600 hp in a 951 would be a wicked ride and way too fast for me. There was a pro turbo builder down here whos daily driver was a 750 hp 911. He enbarked on building a 700 hp 944, and i actually went by the shop one day to check it out. He was pretty far into it at the time. He ended up bailing on the project for some reason. It was not over his head as these guys had build several various 80G 911 engines, 1200 hp v8's 350 hp jap bike with a T04 and FI. They built some really radical stuff. One of the last ones I talked to them about was a 2000 hp Chevelle with a mountain motor and twin thumpers.

Too bad i really wanted to see that 951 when he finished. From what I heard he ended up selling his T 911 and bought a Lambo of some sort.
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