Pt6262 vs pt6765 ?
Pt6262 vs pt6765 ? I have not seen a lot of talk on here regarding twin turbo sizing. I just picked up a set of PT6262's with CEA billet wheel, ported race cover, v bands etc. Deal was too good to pass up. If it would make more sense for me to run a different turbo it will be no problem as my friend is hounding me to sell the units to him for his TT 03 cobra. That being said...
I have a 370 CID motor 9:5:1, 317 heads, TU1 cam backed up by a 6sp and 9"... I would like to hit 1000rwhp. Would these 6262's get me there? Would it make more sense to go with the larger 6765s similarly optioned? I am open to all suggestions and comments.
I have a 370 CID motor 9:5:1, 317 heads, TU1 cam backed up by a 6sp and 9"... I would like to hit 1000rwhp. Would these 6262's get me there? Would it make more sense to go with the larger 6765s similarly optioned? I am open to all suggestions and comments.
realistically, the 1000hp would simply be a dyno number for bragging rights. Would probably be useless on the street. Street "kill mode" in the 800-900 range these would probably be killer as far as a power and torque curve is concerned?
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The 6262 is based off of, or similar to, or flows similar to the GT35, but a billet version.
for comparison, They make 1000-1050 in the vettes at 20 psi. At 25 Psi with good tune ups, they have made 1300 in a vengeance built car, but drive pressure was high.
They will be fully lit around 3500-3800 depending on cam, compression, and other mods.
The 6765 isnt made any more, that was superseded by the 6766. Same compressor, new turbine which makes roughly 40 more HP.
6766s see 10 psi around 3800 in a 9:1 390 cube LS.
for comparison, They make 1000-1050 in the vettes at 20 psi. At 25 Psi with good tune ups, they have made 1300 in a vengeance built car, but drive pressure was high.
They will be fully lit around 3500-3800 depending on cam, compression, and other mods.
The 6765 isnt made any more, that was superseded by the 6766. Same compressor, new turbine which makes roughly 40 more HP.
6766s see 10 psi around 3800 in a 9:1 390 cube LS.
TECH Fanatic
Joined: Nov 2001
Posts: 1,027
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From: KS
Pay attention to guys like this ^^^ and Louis. These few and far between guys are the ones to pay attention to. See my sig. These numbers are with 6165's and are no joke. No Dyno tricks just a well thought out combination. Cam and heads were the key. There is no doubt I could have broke a thousand easily at 18 lbs. So yes keep the 62's.
What about a 6265 to let that thing breath a little. Or the Borg Warner billet s362 which is a super nice piece. Don't get me wrong, I am sure the 6262 will get you there, but maybe a little more breathing room and a little less backpressure.
I have no experience with the Borg stuff, but its tried and true in the diesel world, and the products last. Guys like Kirk from boostlab push a lot of Borgs, I might ask him.
As far as going up in turbine, its never a bad thing on the small frame stuff, because you can always go down in A/R if you are unhappy with spool. In the grand scheme of things, from a 6262 to a 6266, you are only talking 2mm of turbine tip extension on each side. Spool wont be affected much, but power from 6-7500 will greatly increase.
Im in the process of gathering a lot of turbine data because its so vital to these combinations, but rarely is it recorded or even known.
As far as going up in turbine, its never a bad thing on the small frame stuff, because you can always go down in A/R if you are unhappy with spool. In the grand scheme of things, from a 6262 to a 6266, you are only talking 2mm of turbine tip extension on each side. Spool wont be affected much, but power from 6-7500 will greatly increase.
Im in the process of gathering a lot of turbine data because its so vital to these combinations, but rarely is it recorded or even known.
Have to agree, hell half of the folks don't even know or list the turbine wheel, only the housing ar. But it can sure make a big difference on performance. I always like to let motors breath and the ls platform seems to flow a LOT of air. To me jumping up a bit to a larger turbine will only help keep the motor happy in the upper rpms where too small a turbine can form a bottleneck.
Starting the run at 2500 by 3500 I'm at 10lbs and 4000 is 17-18lbs. Of course boost controller is ramping in the boost after 15lbs so. Small cam 427 with 6766's stock exhaust. Which is hurting my spool and overall power some what. GL with what your doing bro good to get info and opinons we all have them bro. But in the end you need to make your own decisions. Just listen to ppl with good info like Louis. I'm not a master at turbo sizing etc... But I have a little experience and know a few things. Louis has done a lot more than me.
