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Old 04-20-2008, 07:37 PM   #1
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Default Ditching mani/dp, but go to what?

I currently have a DSM T25 .48/.49 and the cheap e-cracking mani/dp setup. I'm pretty happy with everything @11 psi and love the spool, but it's time to switch to something reliable and solid for track days. Since I can't find a good mani/dp for DSM flanged for decent prices, I think I'm going with the begi mani (for standard T25), new turbo, and dp.

I've tried to search for answers to these questions, but haven't been able to find much, if any. Questions are: Begi dp, or FM cast & SS dp? Reliability? If Begi, is the divorced gasses worth the $, or go with the S kit dp? How much more performance in the divorced gasses design?

I'm pretty sure I want .80/.64 T25, but should I go with SR20 S13 T25, or spend the $$$ on the GT2554 (and get it from begi since they mod theirs)? I think everything is the same (trim, a/r, etc.) between the two, except for BB, and new vs. used). How much better spool on the BB vs journal bearings? How much spool would I be losing compared to the .48/.49 DSM?

Just want a cost effective solution. I don't think I'll be going to external wg either, or looking for anything more than 230whp in the end.

Last edited by soulcarving; 04-20-2008 at 09:15 PM.
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Old 04-21-2008, 12:11 AM   #2
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.80/.64 is that the a/r you are planning on running? do you have a v6 engine in your car? that is pretty big for a 1.8 i would say. you will see boost at 4500rpm lol. but realistically a t3 super 60 would do your needs.
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Old 04-21-2008, 11:17 AM   #3
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Just get the 2560 from Begi with the manu and divorced DP, then thank me later for steering you in the right direction.
If you source **** on your own you are always at risk of getting non-matching hardware, just ask Saml01, he'll tell you all about it.
The divorced pipe is the way to go, it should help spool, and with the 2560 and 3" exhaust, you should spool sooner than the t25 you got now and have more top end potential. Good luck.
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Old 04-21-2008, 12:54 PM   #4
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Quote:
Originally Posted by musanovic View Post
.80/.64 is that the a/r you are planning on running? do you have a v6 engine in your car? that is pretty big for a 1.8 i would say. you will see boost at 4500rpm lol. but realistically a t3 super 60 would do your needs.
I believe the T25 .80/.64 is 54mm wheel, and will spool faster than the T3 S60, given everything else being equal...
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Old 04-21-2008, 12:57 PM   #5
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Originally Posted by Zabac View Post
and with the 2560 and 3" exhaust, you should spool sooner than the t25 you got now and have more top end potential. Good luck.
Hmm, I didn't think that you could make up spool by that much...sweet.
Thanks zabac
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Old 04-21-2008, 01:31 PM   #6
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My T3 spools faster

the SR20 T25 is common here. Samnavy runs it and so does Shiuend. You should see both their dyno plots at 12psi.

I'll make it easy for you:

Shuiend's:


1.8L BEGi kit - 12psi, dropping to 9psi at redline

SamNavy's:


1.6L BEGi manifold and DP: 12psi.
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Old 04-21-2008, 05:19 PM   #7
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My T3 spools faster
What have you done to make it spool faster (than even a GT2554 ), or is it like that out of the box?
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Old 04-21-2008, 05:29 PM   #8
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It's not really that I spool faster, I hit peak faster and more power per psi....I'm comparing our dynos now....Sam's SR20 T25 (non-bb) starts to spool faster, but mine ramps up fairly quick and produces more low-end due to a few things.

I'm sure if Sam had a 3" exhaust as well, it wouldn't be this close

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