msupra1 Posted May 7, 2015 Share Posted May 7, 2015 My 66mm turbo (Borg Warner S366) with .91 divided housing on divided manifold hits full boost at 4400pm in 3rd. It's even more lazy in 2nd and 1st. This is on a 3" downpipe and 269 cams. Instead of changing the turbo itself, I was thinking to change to a cast manifold. The Supra is making about 690bhp at 1.65 bar on 50/50 water/meth injection The goal is to make the same power at the same boost level, but spool 400-500rpm sooner. Around 3900-4000 rpm would be better. Is this possible to achieve with a cast manifold? or how can I achieve this with a smaller turbo. Quote Link to comment Share on other sites More sharing options...
Littler Posted May 7, 2015 Share Posted May 7, 2015 A cast mainfold would give you great spool but there is a potential of losing some power. The idea would be to get a cast manifold that minimises the top end loss while keeping the great spool (here comes the shameless plug), I have the rare Arnout cast manifold for sale that would fit the bill for your goals http://www.mkivsupra.net/vbb/showthread.php?320903-Rare-Arnout-Cast-Manifold Now to even up my slight biased approach, you could get a gen2 precision turbo like the 6266 or 6466 (depending on your power now) which would bring the spool to a better level and makes good power. Quote Link to comment Share on other sites More sharing options...
Glanza_Mike Posted May 7, 2015 Share Posted May 7, 2015 Correct me if i'm wrong but i really don't think 269 cams will help either, they will be pushing the power further up the rev range. I haven't actually heard of 269 cams before tbh, i thought it was 256 then 264 and 272 but i guess i must be wrong. Quote Link to comment Share on other sites More sharing options...
Justin Bieber Posted May 7, 2015 Share Posted May 7, 2015 SRD make 269 cams, as do GSC in the US iirc Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted May 7, 2015 Share Posted May 7, 2015 I would agree that the cams wont help spool, cam timing will also play a part, I managed to get my GT4088 to spool by 3,200rpm and make 1 bar by 3,800rpm buy advancing the exhaust cam timing with std J spec cams. Quote Link to comment Share on other sites More sharing options...
666 Posted May 7, 2015 Share Posted May 7, 2015 (edited) Well a cast manifold can make the power you want power. I know of 2 supras making over 900 to the wheels with a cast manifold. FRS just made over 1000whp on a cast manifold too. Edited May 7, 2015 by 666 (see edit history) Quote Link to comment Share on other sites More sharing options...
johnny g Posted May 7, 2015 Share Posted May 7, 2015 Cast manifold and mild cams will make an epic spool on a 6266. Something no bigger than a 262, maybe a 256. Quote Link to comment Share on other sites More sharing options...
666 Posted May 7, 2015 Share Posted May 7, 2015 Cast manifold and mild cams will make an epic spool on a 6266. Something no bigger than a 262, maybe a 256. Agreed ^^ A smaller turbo for your powergoals will be much more fun! The S366 is proven to make over 800whp. Quote Link to comment Share on other sites More sharing options...
mellonman Posted May 7, 2015 Share Posted May 7, 2015 I will put this here its a good read and back to back results on just a 3.5 vs 3 inch down pipe .net you 200 rpm spool alone http://www.superstreetonline.com/how-to/engine/modp-1102-exhaust-test-tech/ Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted May 7, 2015 Share Posted May 7, 2015 Too cammy, you don't need such aggressive duration. Quote Link to comment Share on other sites More sharing options...
Chris Bailey Posted May 7, 2015 Share Posted May 7, 2015 Cast manifold or SRD manifold 256/264 cams Precision 6266 Journal or DBB. Would make for a very fast spooling setup Quote Link to comment Share on other sites More sharing options...
msupra1 Posted May 7, 2015 Author Share Posted May 7, 2015 (edited) I thought I'd mention that these are USA Made GSC S1 power-division Stage 1 cams. On my stock j-spec cams I was hitting boost a 4400rpm as well. These cams are rated to lose zero on the bottom end which from tests is true. They also make more power and out perform HKS 272's cams significantly. The GSC is a beast of a cam... they are great. So these cams are not sacrificing bottom end. The build boost up and spool is same as the j-spec cams. It will help a lot with mid range / top end power. I will put this here its a good read and back to back results on just a 3.5 vs 3 inch down pipe .net you 200 rpm spool alone http://www.superstreetonline.com/how-to/engine/modp-1102-exhaust-test-tech/ I've been going back and forth about this. My tuner said that there wouldn't be really much difference, and a bigger downpipe is not really necessary for my power level. Well regardless, if I got a cast manifold, I would have to get a new downpipe made. So 3.5" is something to consider. I've already been a few single turbo setup's so I don't want to get in over my head, already spend too much money. I wanted to keep it simple, just change the manifold. Edited May 7, 2015 by msupra1 (see edit history) Quote Link to comment Share on other sites More sharing options...
mellonman Posted May 8, 2015 Share Posted May 8, 2015 depending on what manifold and turbo you have now you might be able to get a quick spool valve ? Quote Link to comment Share on other sites More sharing options...
bignum Posted May 8, 2015 Share Posted May 8, 2015 Problem you have, there isn`t a divided cast mani available so will missmatch with your divided turbo. Quote Link to comment Share on other sites More sharing options...
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