In Soviet Russia car build YOU!
08-30-2012, 05:26 PM
#665
Elite Member
Thread Starter
iTrader: (10)
Join Date: Jan 2010
Location: VA
Posts: 3,493
Total Cats: 268
Yeah that's my biggest question too. I already know the 6258 spools like a GT2554. 6758 is same turbine wheel but completely different compressor wheel. Weight difference is negligible between the 2 wheels but the design is different. 6258 uses a 14 blade wheel where as 6758 is a 12 blade wheel.
Reply
0
0
08-30-2012, 05:38 PM
#667
Elite Member
Thread Starter
iTrader: (10)
Join Date: Jan 2010
Location: VA
Posts: 3,493
Total Cats: 268
yep i'm the first.
the only point of reference of 6758 vs 6258 I have is some greek guy with an Audi TT who commented on my
the only point of reference of 6758 vs 6258 I have is some greek guy with an Audi TT who commented on my
Originally Posted by dem crazy greeks
Yes I've tried both in the same car and setup. The 6258 makes much more power in the low rpm, it spools like a VF34. The 6758 is suitable for your setup since you need 400 WHP but you should expect later spool.
Reply
0
0
08-30-2012, 05:53 PM
#668
Originally Posted by dem crazy greeks
Yes I've tried both in the same car and setup. The 6258 makes much more power in the low rpm, it spools like a VF34. The 6758 is suitable for your setup since you need 400 WHP but you should expect later spool.
Of course it will spool later. How much later is the question. Will it spool like a 2860? Or worse, closer to a 3076?
Also, is there any way to compare theoretical spool times via compressor maps?
Reply
0
0
08-30-2012, 06:15 PM
#670
Elite Member
Thread Starter
iTrader: (10)
Join Date: Jan 2010
Location: VA
Posts: 3,493
Total Cats: 268
GT25 and GT28 have different turbine wheels.
6258 and 6278 have same turbine wheels.
GT2554 and GT2560 have same turbine wheels.
therefore, it should spool like a GT2560.
6258 and 6278 have same turbine wheels.
GT2554 and GT2560 have same turbine wheels.
therefore, it should spool like a GT2560.
Reply
0
0
08-30-2012, 08:00 PM
#675
Elite Member
Thread Starter
iTrader: (10)
Join Date: Jan 2010
Location: VA
Posts: 3,493
Total Cats: 268
I don't really care about spool on a dyno.. I care about transient response. As long as this one has the same "ready to go, anytime, anywhere" super-awesome feel that the 6258 had, I don't care.
Oh and I wonder if it whistles differently....
Indy car? 
Oh and I wonder if it whistles differently....
Reply
0
0
08-30-2012, 08:04 PM
#676
I bet it will spool about 200-300 rpm's later, just a wild speculation from all the EFR research I have done in my life.
But you won't be spoolin at all until I fix up the manifold!!! Mani should be all fixed and spiffy on Sunday, and shipped on Monday (tuesday probably because labor day). I am going to add some gusset plates to the affected area as well, just like absurdflow does on their long sections. I will put some pics in here of the glory
But you won't be spoolin at all until I fix up the manifold!!! Mani should be all fixed and spiffy on Sunday, and shipped on Monday (tuesday probably because labor day). I am going to add some gusset plates to the affected area as well, just like absurdflow does on their long sections. I will put some pics in here of the glory
Reply
0
0
