precision 76gts?????
Originally Posted by TeeKay
FWIW, I ran some numbers a couple of weeks ago on a 383 @ 90% VE.
I looked at low boost of 8 & 10 psi @ 3500, 5000, and 6500 rpm and plotted them on a T76 compressor map wanting something in the 750-800 chp range. Both showed that at 3500 the data points are in the most efficient (78%) range, at 5000 there is only a small drop to 70+%, but at 6500 its pretty close to the choke at an efficiency below 65%. So I'm thinking that the T76 would support 6000 RPM at 10 psi and make somewhere in the neighborhood of 720-750 hp out of a 383. The most efficient boost level (according to the map) appears to be at about 12 psi and looks like it would make about 800+hp on a 383.
. I would think that a 370 would be close to the same thing since it's only about 3% C.I. difference.
I looked at low boost of 8 & 10 psi @ 3500, 5000, and 6500 rpm and plotted them on a T76 compressor map wanting something in the 750-800 chp range. Both showed that at 3500 the data points are in the most efficient (78%) range, at 5000 there is only a small drop to 70+%, but at 6500 its pretty close to the choke at an efficiency below 65%. So I'm thinking that the T76 would support 6000 RPM at 10 psi and make somewhere in the neighborhood of 720-750 hp out of a 383. The most efficient boost level (according to the map) appears to be at about 12 psi and looks like it would make about 800+hp on a 383.
. I would think that a 370 would be close to the same thing since it's only about 3% C.I. difference.
If thats the Case then Jose il be giving you a call...... when can we start doing what me and you were talking about????
Kyle
The most important part about these compressor maps is turbine inlet temp. These compressor maps are developed using 1100dF temps. So if you are running a rear mount the map will shift.
BTW, if you are looking to get really technical I can make a copy of all the data test point we have to use to develop a compressor map. Its WAY more then one would think...hehe
BTW, if you are looking to get really technical I can make a copy of all the data test point we have to use to develop a compressor map. Its WAY more then one would think...hehe
TECH Apprentice
Joined: Jan 2004
Posts: 337
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From: Frisco TX (Dallas Area)
Originally Posted by JZ 97 SS 1500
The most important part about these compressor maps is turbine inlet temp. These compressor maps are developed using 1100dF temps. So if you are running a rear mount the map will shift.
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Which way does it shift and about how much for say 600°F instead of 1100? BTW, can you compensate for a left shift with lower A/R's? Gee, I hope that's an intelligent question. lol Well using a smaller A/R will only help with the spool up. It does not effect though any of the efficiency outputs of the compressor. As for how much it shifts it...well it remains to be seen. Mathematically it could possibly be theoretically shown, but until we do some flow testing (which we are) we won't know the exact amount. We plan to start from 100dF and work our way up to see how much heat actually effects the map shift.
BTW, never be afraid to ask any questions....thats what we are here for
BTW, never be afraid to ask any questions....thats what we are here for
Originally Posted by JZ 97 SS 1500
Well using a smaller A/R will only help with the spool up. It does not effect though any of the efficiency outputs of the compressor. As for how much it shifts it...well it remains to be seen. Mathematically it could possibly be theoretically shown, but until we do some flow testing (which we are) we won't know the exact amount. We plan to start from 100dF and work our way up to see how much heat actually effects the map shift.
BTW, never be afraid to ask any questions....thats what we are here for
BTW, never be afraid to ask any questions....thats what we are here for
Thats good to Know..... Jose PM me the # you would like me to call to chat about the wheels.
Thanks Kyle
