Cusco Center Diff: Kicks Ass on street... SUCKS ASS on Dyno
Thread Starter
Big Baller
iTrader: (1)
Joined: Nov 2002
Posts: 1,821
From: Washington
Car Info: 93 BG5, 00&01 GM6, 06LGT, 07STi
Cusco Center Diff: SUCKS *** on Dyno Sheet pic included
Well we attempted to dyno my car today on the DynaPack.
Attempted being the key word. We didn't exhaust all our resources, but we ran out of time.
I never got to punch it.... the dyno and drivetrain had some CRAZY oscillations!!
One sheet I was able to get all the way to 1/2 throttle for 240whp.
However, This dyno sheet says it all:
*SIGH*
So basically I need a four wheel roller dyno for this to work.
Attempted being the key word. We didn't exhaust all our resources, but we ran out of time.
I never got to punch it.... the dyno and drivetrain had some CRAZY oscillations!!
One sheet I was able to get all the way to 1/2 throttle for 240whp.
However, This dyno sheet says it all:
*SIGH*
So basically I need a four wheel roller dyno for this to work.
Last edited by ImprezaRSX; Apr 16, 2005 at 05:59 PM.
Thread Starter
Big Baller
iTrader: (1)
Joined: Nov 2002
Posts: 1,821
From: Washington
Car Info: 93 BG5, 00&01 GM6, 06LGT, 07STi
Tony @ XX-Tuning called it Babe Ruth's Autograph.
We may have been able to get it to work if we would have been able to lock the front wheels and run just the rears. We just didn't have any more time.
We may have been able to get it to work if we would have been able to lock the front wheels and run just the rears. We just didn't have any more time.
Thread Starter
Big Baller
iTrader: (1)
Joined: Nov 2002
Posts: 1,821
From: Washington
Car Info: 93 BG5, 00&01 GM6, 06LGT, 07STi
it was worse than that.
the dynapack wants even output out of all four. So it changes it's loading accordingly.
So to start the rear had 65% front 35%.
The dynapack sees this and loads the rears more, this in turn causes the OPEN center diff to transfer ALL power to the fronts.
The dynapack sees this and loads the fronts more/rears less... this causes the open center diff to transfer ALL power back to the rears...
The dynapack sees this..... you get the point.
RPM's were going wacky! The only rpm that was the same was the rears due to Rear LSD> Even the fronts were swapping power. It was crazy out of control.
the dynapack wants even output out of all four. So it changes it's loading accordingly.
So to start the rear had 65% front 35%.
The dynapack sees this and loads the rears more, this in turn causes the OPEN center diff to transfer ALL power to the fronts.
The dynapack sees this and loads the fronts more/rears less... this causes the open center diff to transfer ALL power back to the rears...
The dynapack sees this..... you get the point.
RPM's were going wacky! The only rpm that was the same was the rears due to Rear LSD> Even the fronts were swapping power. It was crazy out of control.
Thread Starter
Big Baller
iTrader: (1)
Joined: Nov 2002
Posts: 1,821
From: Washington
Car Info: 93 BG5, 00&01 GM6, 06LGT, 07STi
it doesn't matter on viscous coupled cars. They never put 100% power anywhere. Mine is an OPEN diff.
oh, I should have said same RPM from all four wheels. Doesn't need the same load, just rpm. Viscous coupling diffs like that. Open... not so much
oh, I should have said same RPM from all four wheels. Doesn't need the same load, just rpm. Viscous coupling diffs like that. Open... not so much
Last edited by ImprezaRSX; Apr 16, 2005 at 06:00 PM.
Thread Starter
Big Baller
iTrader: (1)
Joined: Nov 2002
Posts: 1,821
From: Washington
Car Info: 93 BG5, 00&01 GM6, 06LGT, 07STi
video of my car.
Listen to the surging and clanging.
http://rs-scooby.com/albums/TurboRS/MOV01738.mpg
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