Could a T6 Single Spool Early on an LS3?
Thread Starter
TECH Apprentice
Joined: Apr 2012
Posts: 333
Likes: 4
From: New Zealand
Could a T6 Single Spool Early on an LS3? I run a single T4 rear mount and have 300hp at the wheels by 2600rpm, I'd like to keep close to that as it makes for a great drive with the tall 3.07:1 gears. But the small 67 turbo with 0.81A/R creates massive back pressure which makes a wastegate useless.
Question, if I spent the coin to have a custom billet wheel T6 made, could it boost from 2000rpm with say 5lb by 2500-2700rpm?
Who'd make the most reliable unit?
I like the new ET billet BW wheells. I know they make big power at high boost but I need lots of HP per lb of boost as I run low boost (10lb) and only need to make 800hp. (more than that is a waste on my street rubber)
thanks for input guys
Question, if I spent the coin to have a custom billet wheel T6 made, could it boost from 2000rpm with say 5lb by 2500-2700rpm?
Who'd make the most reliable unit?
I like the new ET billet BW wheells. I know they make big power at high boost but I need lots of HP per lb of boost as I run low boost (10lb) and only need to make 800hp. (more than that is a waste on my street rubber)
thanks for input guys
Why go to the T6 and the heavy BW units when a Precision 7675CEA will get you there and more than likely bolt right up with minimal modifications. The T6 BW units are twice the size and weigh in around 50lbs where as the T4's are usually 20-25lbs.
Thread Starter
TECH Apprentice
Joined: Apr 2012
Posts: 333
Likes: 4
From: New Zealand
It is a front mount but I haven't driven it a lot yet because I just got it back but boost comes in pretty quick, I would say somewhere around 3000 maybe even lower. It spools very fast.
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Verdad Gallardo Thread Starter
TECH Apprentice
Joined: Apr 2012
Posts: 333
Likes: 4
From: New Zealand
That would be perfect!! However for me to get that on a rear mount I'd have to use one size smaller AR or put up with the boost coming in a few hundred rpm later.
For instance...A T76 versus a T88.
T76:
The 4th plot is 3600rpm. This is based on a "normal" stock bottom end 346 c.i. LS1 engine. As you can see it should be able to make 20psi by 3600rpm with that turbo. This is a WOT situation with full load.
We take the same engine and the same airflow demand and plot it on a T88 compressor map:
Again the 4th plot is 3600rpm. As you can see the wheel is really too big for the engine and there isn't enough available exhaust flow to put enough energy to the turbine to generate boost.
What's interesting to note is that the compressor map is broader at 1.7 pressure ratio than it is at 2.3 and that there might be just enough available exhaust energy to make 10psi at 3200rpm, but probably not 20psi at 3600rpm.
If you had a race car with a 4000+ stall converter that could come up on the trans brake and launch above 4000rpm it would probably work out OK.
Last edited by Sales@Tick; Apr 9, 2014 at 05:47 PM.
It's design.
For instance...A T76 versus a T88.
T76:
The 4th plot is 3600rpm. This is based on a "normal" stock bottom end 346 c.i. LS1 engine. As you can see it should be able to make 20psi by 3600rpm with that turbo. This is a WOT situation with full load.
We take the same engine and the same airflow demand and plot it on a T88 compressor map:
Again the 4th plot is 3600rpm. As you can see the wheel is really too big for the engine and there isn't enough available exhaust flow to put enough energy to the turbine to generate boost.
What's interesting to note is that the compressor map is broader at 1.7 pressure ratio than it is at 2.3 and that there might be just enough available exhaust energy to make 10psi at 3200rpm, but probably not 20psi at 3600rpm.
If you had a race car with a 4000+ stall converter that could come up on the trans brake and launch above 4000rpm it would probably work out OK.
For instance...A T76 versus a T88.
T76:
The 4th plot is 3600rpm. This is based on a "normal" stock bottom end 346 c.i. LS1 engine. As you can see it should be able to make 20psi by 3600rpm with that turbo. This is a WOT situation with full load.
We take the same engine and the same airflow demand and plot it on a T88 compressor map:
Again the 4th plot is 3600rpm. As you can see the wheel is really too big for the engine and there isn't enough available exhaust flow to put enough energy to the turbine to generate boost.
What's interesting to note is that the compressor map is broader at 1.7 pressure ratio than it is at 2.3 and that there might be just enough available exhaust energy to make 10psi at 3200rpm, but probably not 20psi at 3600rpm.
If you had a race car with a 4000+ stall converter that could come up on the trans brake and launch above 4000rpm it would probably work out OK.