76 or 88mm turbo selection
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From: Port Tobacco, MD
76 or 88mm turbo selection I am debating about build a single turbo kit over the winter. I have basically got everything wrapped up except for turbo selection. What would be the difference between running a Precision turbo PTE76 or PTE88mm. Any thoughts?
Phil
Phil
76 would hold you back and a 88would be too laggy. what you need is something right in the middle... HEY! i have for sale a gt80R with bearings for 1500 including shipping dang that works out sweet 
Phil the T88 will make a little more power on the top side. In the mid boost level they will be pretty similar. As the boost rise you will get close to the choke line on the 76 soon. The 88 will still allow for some added boost without going into the choke zone. The only drawback is some added lag.
Jose
Jose
2.25 or 2.5, well either will work just fine. To add some velocity stick with the 2.25 crossover. As for the T88 spool up...probably around 4700-4900rpms. The 76GTS is about 4000-4400rpms. The GT80 with the R-trim wheel and DBB will be around 4500-4600 or so.
Jose
Jose
if you're askingme i have a 2.5 crossover and with the 346 had full boost at about 3750
(graph of 346 9:1 compression and .520 lift cam)
http://home.comcast.net/~deezuns/LS1...s/image016.jpg
(graph of 346 9:1 compression and .520 lift cam)
http://home.comcast.net/~deezuns/LS1...s/image016.jpg
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From: Port Tobacco, MD
Originally Posted by NOSjohn
Your running 12:1 compression right now? I imagine there are changes planned for the turbo? Sounds like it will be a wicked C5 with any of the above turbos. 
Phil
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From: Port Tobacco, MD
Originally Posted by JZ 97 SS 1500
2.25 or 2.5, well either will work just fine. To add some velocity stick with the 2.25 crossover. As for the T88 spool up...probably around 4700-4900rpms. The 76GTS is about 4000-4400rpms. The GT80 with the R-trim wheel and DBB will be around 4500-4600 or so.
Jose
Jose
Phil
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From: Port Tobacco, MD
Originally Posted by MIGHTYMOUSE
if you're askingme i have a 2.5 crossover and with the 346 had full boost at about 3750
(graph of 346 9:1 compression and .520 lift cam)
http://home.comcast.net/~deezuns/LS1...s/image016.jpg
(graph of 346 9:1 compression and .520 lift cam)
http://home.comcast.net/~deezuns/LS1...s/image016.jpg
What size downpipe are you running? What cam specs?
Phil
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From: Port Tobacco, MD
Here's my plan:
1.75" SS headers(turbo on driver side)
2.5" SS crossover pipe
PTE 76 or 88
4" SS downpipe into dual 3" cat-back
3-3.5" Aluminum Pipes
Spearco IC
1.75" SS headers(turbo on driver side)
2.5" SS crossover pipe
PTE 76 or 88
4" SS downpipe into dual 3" cat-back
3-3.5" Aluminum Pipes
Spearco IC
Phil,
I have a setup similar to what you are building..Its a stock cube, PTE T76 GTS single ,3" downpipe, 2.5" crossover. The car made 730rwhp/740rwtq @ 16psi using a s/c spec cam. I've recently switched cams and although I haven't dynoed the car yet, my atap scans showed that from 2800 - 4100rpm, the engine is flowing an average of 8lbs/min more than the old setup with the s/c cam. I haven't gone above 4100 on the street for safety reasons. I will be tuning the car on a dyno in about 5 days.
I currently see 16psi by 3,600rpm. I thought about going to T88 (even built a 429 to put on), but found that it won't fit with my setup. I'm going to see how far I can push the current setup. I fully expect to see 800rwhp before its all said and done. I think LS1 speed made 850rwhp with a T76gtq. I'm kinda glad the T88 wouldn't fit as my car has pretty good response time and isn't lacking for power.
I have a setup similar to what you are building..Its a stock cube, PTE T76 GTS single ,3" downpipe, 2.5" crossover. The car made 730rwhp/740rwtq @ 16psi using a s/c spec cam. I've recently switched cams and although I haven't dynoed the car yet, my atap scans showed that from 2800 - 4100rpm, the engine is flowing an average of 8lbs/min more than the old setup with the s/c cam. I haven't gone above 4100 on the street for safety reasons. I will be tuning the car on a dyno in about 5 days.
I currently see 16psi by 3,600rpm. I thought about going to T88 (even built a 429 to put on), but found that it won't fit with my setup. I'm going to see how far I can push the current setup. I fully expect to see 800rwhp before its all said and done. I think LS1 speed made 850rwhp with a T76gtq. I'm kinda glad the T88 wouldn't fit as my car has pretty good response time and isn't lacking for power.
