Subject	Split DP do improve spoolup.
Posted by	ZHOUND on May 15, 2003 at 12:19 PM
	This message has been viewed 199 times.
In Reply To	Split down pipes shouldn't affect spool up because the posted by MikeH(Twin GT35BB Incon Z) on May 15, 2003 at 11:46 AM
Message	:wastegate is closed during the spool up. The only thing that would change is the volume in split downpipe is smaller for the turbine discharge. I can see the HP being increased but the spool up 500 rpm sooner I don't yet believe. I know mine get full boost by 4500 rpm . In stock turbos full boost is at 3500 rpm. I would like to see the dyno curve of the same car with and without the split down pipe. Depending on the turbo, I don't think that the wastegates are always completely closed while building boost. IMO internal wastegates are not as accurate as external. Separating out the wastegates will also minimize any turbulance caused by the exhaust from wastegates so the airflow is nice and fast. The difference between regular downpipes and split DPs is significant enough that you'll feel it in the seat of the pants. Everyone who has gotten the split downpipes will tell you that the spoolup is quicker.
Follow Ups	Ash... related question to dyno >> - Greg (Dallas) 11:38:48 05/15/03 Split down pipes shouldn't affect spool up because the - MikeH(Twin GT35BB Incon Z) 11:46:24 05/15/03 Don't they reduce the turbulence around the turbine exit - MugenRacer 12:10:44 05/15/03 Split DP do improve spoolup. - ZHOUND 12:19:37 05/15/03 I'm not discounting split downpipes. Mine are split . - MikeH(Twin GT35BB Incon Z) 12:27:28 05/15/03 Also you can't compare gutted precats to smooth curve down - MikeH(Twin GT35BB Incon Z) 11:48:41 05/15/03 re-read his post. (n/m) - Dallas DamonZ 12:02:42 05/15/03 They should improve spoolup to some degree because they - AshsZ (FabZEM All) 12:18:17 05/15/03 Nobody said anything about shifting gears. That is - MikeH(Twin GT35BB Incon Z) 12:56:42 05/15/03 If you think about it, there shouldn't be any advantage - AshsZ (FabZEM All) 16:00:44 05/15/03 1BADTTZ has split DPs with the real sport600s. - ZHOUND 12:27:14 05/15/03 Again, I was just looking at the dyno curve >> - Greg (Dallas) 12:29:32 05/15/03 The turbo's on the car are real Sport 600's, no BB. (n/m) - Robert@Z1 14:02:26 05/15/03 BB catridges are overrated IMO (n/m) - U ZCREAM 12:42:43 05/15/03 why do you say that? explain please (n/m) - aliaZ 12:51:58 05/15/03 Well not 100% my opinion really, but... - U ZCREAM 13:13:46 05/15/03 Lag doesn't matter for Dyno queens. (n/m) - MugenRacer 13:49:52 05/15/03 exactly (n/m) - aliaZ 14:11:06 05/15/03 Dyno queen or not, his car is still "faster" from a 60mph - U ZCREAM 14:37:37 05/15/03 What did he run in the 1/4? - ZHOUND 14:45:10 05/15/03 Nope, that car will never go down a dragstrip more than - U ZCREAM 15:33:36 05/15/03 I don't know many people who built their cars for drag strip - ZHOUND 16:59:02 05/15/03 Exactly. I agree with everything you just said - U ZCREAM 17:38:43 05/15/03 Re: Exactly. I agree with everything you just said - ZHOUND 17:56:09 05/15/03 And thats usefull how? Getting a 1 way ticket to jail? - MugenRacer 15:20:12 05/15/03 Your sig quote isn't very fitting for your comments - U ZCREAM 15:37:50 05/15/03 I never said which one I was ;). Yes everyone sppeds. (n/m) - MugenRacer 17:29:47 05/15/03 Is that Micheal Hayes that you're talking about? (n/m) - 5150Z 15:23:55 05/15/03 Steve (n/m) - U ZCREAM 15:38:39 05/15/03 Yea, my bad! Steve! He has a VERY fine car!!! (n/m) - 5150Z 16:17:05 05/15/03 'splain tha one to me, Lucy. (n/m) - Spee 12:53:42 05/15/03 Yea, that is why mine take over 30 seconds to come to - MikeH(Twin GT35BB Incon Z) 12:55:22 05/15/03 ?? holy damn (n/m) - aliaZ 12:59:40 05/15/03 wow, got vid? (n/m) - Spee 14:12:16 05/15/03 You can hear the wheels spinning and slowing down - MikeH(Twin GT35BB Incon Z) 14:21:08 05/15/03 Actually the BBs spool fast as hell. Ask ZFreak (n/m) - John@Z1 15:04:57 05/15/03 His turbos are not BB they are standard sp600's - aliaZ 12:48:09 05/15/03 GEEZ, I've been saying it all along.......lol ( Sigh ). - ZBlacktt 13:42:53 05/15/03 Huh? Did someone just say something? ;-) (n/m) - U ZCREAM 14:14:56 05/15/03 Still driving the Van,,lol ;)~ (n/m) - ZBlacktt 16:21:41 05/15/03 I have full boost at 3200rpm....Sport 6XX's :P (n/m) - Bert D(2+2TT) 14:46:21 05/15/03 Greg, Split D/Ps WILL help with spoolup, not a lot maybe - Mark-S G P- 15:36:00 05/15/03 More thoughts on the subject... (long) - Scotts94z32 19:00:19 05/15/03 *assuming a boost controller is used to keep the WGs closed* (n/m) - Scotts94z32 10:00:06 05/16/03
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