Full-Race Twinscroll 40R
Waiting on the new clutch to arrive and get installed... We only were able to make a couple of pulls on the dyno on race gas with the new ETS intercooler before we murdered the Exedy Twin clutch... 
All initial signs are positive that the ETS 4" is performing better than the AMS Standard intercooler - the IATs dropped ~30 degrees (start of run to end of run), the A/F were also leaner and we gained 250rpms of spool...
Final results and logs will need to wait until we get the new clutch installed... Now one thing to keep in mind is that the new clutch is a variable that has changed and the final results comparison isn't exactly 100%, but then again, not many of the tests on this site are 100% accurate and controlled - I believe the new clutch is also ~8 pounds lighter than the Exedy (I'll get exact weights soon) and this alone will have some performance benefit...
All initial signs are positive that the ETS 4" is performing better than the AMS Standard intercooler - the IATs dropped ~30 degrees (start of run to end of run), the A/F were also leaner and we gained 250rpms of spool...
Final results and logs will need to wait until we get the new clutch installed... Now one thing to keep in mind is that the new clutch is a variable that has changed and the final results comparison isn't exactly 100%, but then again, not many of the tests on this site are 100% accurate and controlled - I believe the new clutch is also ~8 pounds lighter than the Exedy (I'll get exact weights soon) and this alone will have some performance benefit...
i believe that tube and fin cores are superior to bar and plate. The 3" thick PWR intercooler cores are the best ive ever used, and ive used a LOT of cores. their only downside is that they arent 4.5" thick - I have yet to find good quality tube and fin cores over 3" thick.
My personal experience - I used to have a 4" thick x 12" tall x 24" long bar and plate core, traditionally front-mounted on my R14 - and had overheating issues on the street in AZ, only after beating on the car then coming to a stop. This year i changed to a vmount with a PWR 3" x 12" x 24". Obviously its a vmount so its apples to oranges but we had wayy cooler water temps and the same IAT - no difference. Running no blockage in front of the radiator really works wonders - and thats the biggest benefit of the tube and fins
My personal experience - I used to have a 4" thick x 12" tall x 24" long bar and plate core, traditionally front-mounted on my R14 - and had overheating issues on the street in AZ, only after beating on the car then coming to a stop. This year i changed to a vmount with a PWR 3" x 12" x 24". Obviously its a vmount so its apples to oranges but we had wayy cooler water temps and the same IAT - no difference. Running no blockage in front of the radiator really works wonders - and thats the biggest benefit of the tube and fins
I've seen IAT results from tube and fin IC setups before and I've never been impressed. What you are saying goes contrary to everything I've seen, so I'm very interested in more on this.
On cars designed for an FMIC, overheating seems to be much less of an issue too.
This is what I got out of the thread. The twin scroll set ups apparently spool faster than the single scroll set up by 500 rpm and then some, making approx the same max hp as a single scroll set up. So the max dyno number becomes less relevant because it only shows wot. Where the turbos have reached max boost setting note they should be almost equal ie same drag race time slip. The key is to try & read when the application is making pwr and you will see compared to same turbo application twin vs single at 200 hp for example there is a difference of approx 500-1000 rpm spool difference. Leading to the idea of possibly making your turbo more enjoyable for street and road race not just for drag racing alone. The only draw back is the price for the twin scroll. 
Last edited by 38six; May 17, 2010 at 02:00 PM.
will have something to debut at SEMA in november
specially since I'm trying to build something very similar to Ted B set up, but w/ the 40R. I'll pm you for more details. 
