***Twins for my 403ci ls2... looking for 1300rwhp.
05-03-2014, 11:46 AM
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***Twins for my 403ci ls2... looking for 1300rwhp. 403ci ls2. CNC'd LS3 heads. Diamond pistons. motor will take atleast 25psi. Compression is in the 9.1-9.3:1 range. I'm leaning towards going twins. It will be a th400 car, I currently have a UCC converter with a 4200stall. Likely will have a 2000hp capable air to water intercooler. There was a few turbos I was contemplating going with... looking for any input! •borg warner s366's with the .91ar... but I think they'd choke up a motor of this size. ••garrett gt4088's with a 1.01ar... I'm worried these May be a little small as well- but I could be wrong. •••garrett gt4202's with 1.01ar housings or their v-band housings- I'm sure they'd make stupid power, but worried that these are a bit too much turbo. Looking at the compressor map on this unit led me to believe they'd be just slightly above the surge limit...atleast under little load. any input would be appreciated. I will NOT put a precision turbo on my car. Thanks in advance!
05-03-2014, 12:04 PM
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car will probably weigh 3100-3150lbs at most. I intend on street'ing the car 99% of the time... knowing that I can take it to the track and be capable of going mid 9's or better on 10-12psi and get into the 8's with a bit more... and possibly bottom 8's killing it. The plan was to crack 1000rwhp by 20psi... but that should come easy.. Even with this power robbing th400
05-03-2014, 12:06 PM
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it's not going to come out until it has a 'real' tire on it... so it's always going to have a 28-29in tire on a 15in wheel. I intend on putting around on 10psi on pump, and obviously race fuel for anything more than 750whp
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05-03-2014, 07:45 PM
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if you think that I could make 1200-1300rwhp out of those Borgs that is most likely route I'll take... I did find a guy that made over 1200rwhp on a similar setup... with those garrett gt4088's.
05-04-2014, 03:56 PM
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Pretty much yes.
And for maybe another $100-150 each, you can have a 366 with a billet impeller.
Unless you have proper tubular manifolds leading to the divided scroll, I'd just run the open scroll.
But BW offer a few sizes of scroll, I think they do bigger than 1.0 too.
05-04-2014, 04:34 PM
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I have yet to see a compressor map- or an actual back to back test that had shown a gain with the billet wheel over the stock cast wheel. I know they look cool as hell... but there is 6 blade 'billet' versions... 11 blade 'billet' versions. and they're coming from many different distributors. NOT that the internet is the absolute best place to gather information- but one guy that got a boost logic (if memory serves me correctly) s366 with their 11 blade billet wheel said he experienced no gains... and it only operated quieter. Do you know anybody that has got a billet version of this turbo and has made power anywhere near they claim to support? Thanks! If the stock cast wheels with the scroll .91ar's will see 1300rwhp or close I'll roll with them!
05-04-2014, 04:42 PM
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I have yet to see a compressor map- or an actual back to back test that had shown a gain with the billet wheel over the stock cast wheel. I know they look cool as hell... but there is 6 blade 'billet' versions... 11 blade 'billet' versions. and they're coming from many different distributors. NOT that the internet is the absolute best place to gather information- but one guy that got a boost logic (if memory serves me correctly) s366 with their 11 blade billet wheel said he experienced no gains... and it only operated quieter. Do you know anybody that has got a billet version of this turbo and has made power anywhere near they claim to support? Thanks! If the stock cast wheels with the scroll .91ar's will see 1300rwhp or close I'll roll with them!
I fully agree about the "unknown" aspect of some of these billet wheel upgrades...it's the very reason I opted for genuine BW billet wheeled turbos for mine ( 364 )
Seemed best all round compromise, albeit at slightly higher cost.
Given the price of the basic 366...they really are hard to overlook. They're dirt cheap
I'd also think the 0.88 open scroll would flow more than the 0.91 divided ?
05-04-2014, 04:48 PM
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I don't see a loss in terms of flow in the turbine housing with the TS. I think it'd actually be a good but better so long as you were utilizing it for it's intended purpose... 'pairing' the cylinders that are firing close... as it makes for better scavenging. Pain in the *** to form those headers without a doubt... but I'm building them so I don't care.