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That's lots of air moving I should really buy a 16V head. I have four 2V head sitting in my house right now. Maybe it should be two 4V heads. All these 16V engines are giving me the itch that needs scratching
I think we all have to take the absolute flow numbers in the same context as dyno results. It's as subjectively based on barometric conditions and also if they calculate correctly. The Porsche 16v heads were clearly well designed that many years ago. Even in stock form they are vastly superior to the most worked 8v heads.
I think we all have to take the absolute flow numbers in the same context as dyno results. It's as subjectively based on barometric conditions and also if they calculate correctly. The Porsche 16v heads were clearly well designed that many years ago. Even in stock form they are vastly superior to the most worked 8v heads.
Makes me wonder if they know just how right they got it.
I'm thinking maybe. Possibly the reason no 16v Turbo was made and after the 968 they shut the party down.
Makes me wonder if they know just how right they got it.
I'm thinking maybe. Possibly the reason no 16v Turbo was made and after the 968 they shut the party down.
off-topic but...
the 4v 944/968 and 928 combustion chamber design (and some say valves and parts) were used on the 959 as well.
so they knew they were good!
but sales were slumping hard in the 90s for the 968 and 928, and they had been building each platform for nearly 20 years at that point and the market had moved on.
remember, early 90s you could get an RX7 turbo, or a Supra turbo, or 3000GT VR4, etc for half the price of a 968, and all of those cars had 20% more power.
So work is back on with this thing, we had a few issues to address before we can get back out for testing. Changed injectors, now just one large set, changed the exhaust manifold a little and we have gone from two 38mm wastegates to two 50mm, that should take care of our boost creep and wastegate problems.
We put a 1.45 turbine housing on and got it back on the dyno, this run doesn't do it full justice, a lot of wheel spin(and the dyno is a heartbreaker anyway), we know from the tuning runs we have met our 800bhp figure ,and that is about all we can get from this combination, the turbo is at close to max speed and we don't want to push the block any further, not a lot of timing in the tune.
So work is back on with this thing, we had a few issues to address before we can get back out for testing. Changed injectors, now just one large set, changed the exhaust manifold a little and we have gone from two 38mm wastegates to two 50mm, that should take care of our boost creep and wastegate problems.
We put a 1.45 turbine housing on and got it back on the dyno, this run doesn't do it full justice, a lot of wheel spin(and the dyno is a heartbreaker anyway), we know from the tuning runs we have met our 800bhp figure ,and that is about all we can get from this combination, the turbo is at close to max speed and we don't want to push the block any further, not a lot of timing in the tune.
Aim to test in a week or two.
Do you have a link/source for the cam gears and belt...?
04-20-2016, 04:40 AM
I should really buy a 16V head. I have four 2V head sitting in my house right now. Maybe it should be two 4V heads. All these 16V engines are giving me the itch that needs scratching
