74mm to small for a 383?
02-11-2009, 09:30 PM
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74mm to small for a 383? about to get the build underway on my T/A. It's a solid roller 383 with AFR 227's and a 248/248 custom solid roller turbo cam. i have a kit with a GT4202 74mm right now. I was planning on gettting the car up and going then uprgrading to a pt88 or something similar. Is the 74mm gonn choke the car too bad to even run it for awile till i upgrade? should i just sell it now and go bigger?
02-12-2009, 08:15 AM
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borg s374 would work well too... just read about a 6L gto making 800whp on 19psi IIRC. http://videos.streetfire.net/video/D...BEI_178753.htm
A 4202 is pretty similar. I think you should be fine.
A 4202 is pretty similar. I think you should be fine.
02-12-2009, 02:13 PM
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dr turbo, what do you think the 74mm will be capable of power wise on that setup?
also once its up and running i wont be hapy with less than 900rwhp and id like to hit 1000rwhp just to say i did it . What turbo would you recomend to accomplish that, and hopefully not get to much bigger physically for fitment reasons.
also once its up and running i wont be hapy with less than 900rwhp and id like to hit 1000rwhp just to say i did it . What turbo would you recomend to accomplish that, and hopefully not get to much bigger physically for fitment reasons.
02-12-2009, 03:17 PM
#7
Like real quick said a S88 would do it as well as a PT88. A 480 might touch a 1000whp through a efficient drive train with a locked converter.
A 400 chassis would not be a bad start and can get you to 1000 with drop in replacements.
Also we built and tuned the GTO, its pretty taxed at about 850whp with the 374-83mm turbine wheel(t4 1.1a/r). A switch to a 87mm turbine wheel would prob keep it from moving as much coolant and make another 25-50hp though. Ideally it needs more on both sides though.
A 400 chassis would not be a bad start and can get you to 1000 with drop in replacements.
Also we built and tuned the GTO, its pretty taxed at about 850whp with the 374-83mm turbine wheel(t4 1.1a/r). A switch to a 87mm turbine wheel would prob keep it from moving as much coolant and make another 25-50hp though. Ideally it needs more on both sides though.
