3.? Liter 16 Valve Turbo Thread
#61
Burning Brakes
Join Date: Oct 2001
Location: Abbotsford, B.C.
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Yeah, must be a big raised hood or something. Modified torque tube too. How does this affect the center of gravity? Seems like it would make the the weight distribution shift a bit more towards the front.
#62
It has been tested – the 16v head shifts the power band up by about 1000 rpm. More power and equal torque.
Thats with turbo on the stock location right? What about relocated turbo, that should even emprove spoolup/torque?
#64
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Originally Posted by Markus951
we are talking about peak torque? what about the cruve?
Thats with turbo on the stock location right? What about relocated turbo, that should even emprove spoolup/torque?
Thats with turbo on the stock location right? What about relocated turbo, that should even emprove spoolup/torque?
Chris White
#66
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Originally Posted by toddk911
Chris:
If you have more boost sooner you will have more tq sooner no??
If you have more boost sooner you will have more tq sooner no??
Originally Posted by toddk911
Chris: If you have more boost sooner you will have more tq sooner no??
Basically you get to tune the system to be efficient over a particular range. The S2/968 engines are tuned for the 4.5 to 6.5 range and the 2.5 is tuned for about 1K lower. Its not about when the turbo is spooled up, its about the tuning of the cam, ports and manifolds. If you put a turbo on a 16v head that is small enough to spool very quickly you will have the turbo running efficiently when the engine is not and by the time the engine is “up on cam” the turbo will run out of its efficiency range.
Set the turbo up to be efficient where the engine is efficient.
Chris White
#68
Advanced
Here's a chart comparing the 3.0 8V Turbo and the 3.0 16V Turbo ("borrowed" from www.powerhaus.com).
I wonder what would have happened to the drop in power from 3100 - 4500RPM if the 16V would have used a 968 head with functioning Variocam? Has anyone heard of a Turbo 16V with Variocam? Any ideas why it is rarely used?
My wet dream, MID,3.1L,16V,Variocam,BB Turbo....Mmmmm.
I wonder what would have happened to the drop in power from 3100 - 4500RPM if the 16V would have used a 968 head with functioning Variocam? Has anyone heard of a Turbo 16V with Variocam? Any ideas why it is rarely used?
My wet dream, MID,3.1L,16V,Variocam,BB Turbo....Mmmmm.
#70
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Originally Posted by Weissach Vampire
My wet dream, MID,3.1L,16V,Variocam,BB Turbo....Mmmmm.
Might look something like this -
#71
Three Wheelin'
Originally Posted by Chris White
How about a dual cam drive with independently adjustable cam timing instead of the variocam? That way you can decrease the amount of intake/exhaust lobe overlap – something the turbos don’t like.
Might look something like this -
Might look something like this -
#72
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Originally Posted by fortysixandtwo
Do those change depending on RPM, or are they locked in position?
Chris White
#73
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I've never looked that closely at a 16v head. Are those the factory intake port sizes? Do the header-head ports use a 3-bolt flange? I hope you spring for a new t-stat after all that effort.
#74
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Originally Posted by Tom M'Guinn
I've never looked that closely at a 16v head. Are those the factory intake port sizes?
[QUOTE=Tom M'Guinn] Do the header-head ports use a 3-bolt flange?QUOTE]
Yep, it is a stronger mount but you can forget taking the headers off in the car!
Originally Posted by Tom M'Guinn
I hope you spring for a new t-stat after all that effort.
Chris White
#75
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Chris this is obviously for track only but with it's broad delivery is it not something that could be used on the road as well? What is the cost of having something like this built or is that something you would rather not calculate?