550hp from a 20B w/ sequential twins?
07-13-04, 12:39 AM
#52
Originally posted by t-von
Also I don't think you would be able to get those hp numbers (550hp)they are advertising if the twins were ran seq(too much air flow turbulance with the inner flapper valves). These turbos are designed to provide lots of spool in the low range for increased torque which improves the heavier Cosmos drivability with an auto. Look at how the twins perform in our Fd's. I don't think anyone has broken the 400rwhp mark with them in seq mode. Non seq????? thats a differant story.
Also I don't think you would be able to get those hp numbers (550hp)they are advertising if the twins were ran seq(too much air flow turbulance with the inner flapper valves). These turbos are designed to provide lots of spool in the low range for increased torque which improves the heavier Cosmos drivability with an auto. Look at how the twins perform in our Fd's. I don't think anyone has broken the 400rwhp mark with them in seq mode. Non seq????? thats a differant story.
Originally posted by 20B 3rd Gen
Agreed t-von
Agreed t-von
07-13-04, 07:11 PM
#53
Originally posted by FDNewbie
T-von...what about a) if that's flywheel hp, meaning it's prob somethin like 480hp @ the wheel, and b) the turbos are blueprinted, balanced, etc whatever they do to enhance turbos? (maybe larger compressor wheels, etc, kind of like what BNR does to the stock twins). Because someone said earlier in this thread that Pettit modifies the stock cosmo twins...
T-von...what about a) if that's flywheel hp, meaning it's prob somethin like 480hp @ the wheel, and b) the turbos are blueprinted, balanced, etc whatever they do to enhance turbos? (maybe larger compressor wheels, etc, kind of like what BNR does to the stock twins). Because someone said earlier in this thread that Pettit modifies the stock cosmo twins...
Improving the turbos efficiancy isn't really going to help much sequentially if you still have the flapper valves in place. You will still have the turbulance which will decrease it's potential. When Fd guys run a "full non seq" set-up, they are removing those valves freeing up any restrictions to smooth out the air flow. This is what makes it possible for non seq twins in an Fd to reach that magical 400rwhp mark. Look at the 99 spec y-pipe! Mazda did make improvements to that so it would flow better and cause less turbulance(which makes it better than the older ones).
Lastly the turbo manifold itself is designed poorly for high end flow. It's too restrictive. Mazda designed that entire set-up to be efficiant in the low and mid range. Thats it!
07-13-04, 08:35 PM
#55
Originally posted by t-von
Improving the turbos efficiancy isn't really going to help much sequentially if you still have the flapper valves in place. You will still have the turbulance which will decrease it's potential. When Fd guys run a "full non seq" set-up, they are removing those valves freeing up any restrictions to smooth out the air flow. This is what makes it possible for non seq twins in an Fd to reach that magical 400rwhp mark. Look at the 99 spec y-pipe! Mazda did make improvements to that so it would flow better and cause less turbulance(which makes it better than the older ones).
Lastly the turbo manifold itself is designed poorly for high end flow. It's too restrictive. Mazda designed that entire set-up to be efficiant in the low and mid range. Thats it!
Improving the turbos efficiancy isn't really going to help much sequentially if you still have the flapper valves in place. You will still have the turbulance which will decrease it's potential. When Fd guys run a "full non seq" set-up, they are removing those valves freeing up any restrictions to smooth out the air flow. This is what makes it possible for non seq twins in an Fd to reach that magical 400rwhp mark. Look at the 99 spec y-pipe! Mazda did make improvements to that so it would flow better and cause less turbulance(which makes it better than the older ones).
Lastly the turbo manifold itself is designed poorly for high end flow. It's too restrictive. Mazda designed that entire set-up to be efficiant in the low and mid range. Thats it!
Originally posted by 20B 3rd Gen
Keep that up and you won't get to ride in my car next year @ RR
Keep that up and you won't get to ride in my car next year @ RR
07-14-04, 02:13 AM
#56
Lookie what I found...
Originally posted by SPOautos
Ohhh yea, I believe Bryan at BNR he told me the stock 20b compressor wheels are actually smaller than the 13b wheels. I believe the ones Pettit uses are actually upgraded and adapted to work with the 20b manifold.....might be wrong though its been a long time since we talked about it.
Ohhh yea, I believe Bryan at BNR he told me the stock 20b compressor wheels are actually smaller than the 13b wheels. I believe the ones Pettit uses are actually upgraded and adapted to work with the 20b manifold.....might be wrong though its been a long time since we talked about it.
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