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Thread: How to get to 4-450whp

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Posts: 61-70 of 80
2010-09-09 21:01:34
i just posted a thread in oem's section regarding divorved j-pipes.

they are down, need 3 more people.

2010-09-09 21:04:16
3 more for what?
2010-09-09 21:11:53
The internal wastegate port size is somewhere between 18-22mm and I wish I'd measured it properly when I had mine off the car for porting but it's about 20mm. (I ended up not porting it at all because the cast iron is so strong and there is almost no room to grow the port in size on a T28.) Most of (not all) the turbulence problems with an internal wastegate can be taken care of with a divorced housing resulting in more power for the same boost level. At that point, you've got a good (not great) flowing 20mm wastegate basically. The problem is, you how have a MUCH better flowing exhaust housing (which is why you make more power) because of the lack of turbulance by the turbo exit and boost will creep even worse with this divorced setup. If that 20mm wastegate is enough to keep boost under control from your setup, then you're in luck. If not, it causes creep obviously. A 400-450 WHP setup can be done with an internal gate for sure and if that's what you want to do then it makes sense. Just don't plan on running "low" boost ever.
Really an external gate should be used at that point, but I can completely understand the desire to stay internal.
2010-09-09 21:16:29
Originally Posted by unijabnx2000
3 more for what?

3 more guys to get it made.

2010-09-09 21:35:23
what about my questions?
2010-09-09 21:38:01
Originally Posted by TOOQIKK
what injectors should i use?
I would step up to Nismo 740cc injectors or similar.

Originally Posted by TOOQIKK
and at what psi would i have to boost to?
I don't know if you'll get there with that turbo. Maybe at 25 psi if the engine holds together? I wouldn't count on it though. You need last generation's turbo, not two generations ago.
2010-09-09 23:52:11
i personally use the 72lb msd they arent good for 4bar however most people only go 4bar to utilize some of its benifits which are to extend the ammount of power the injectors can make, however if you get large enough injectors to begin with you wont have a problem with then sustaining the ammount of power you want to make. msd is a good company for injectors, nismo too
2010-09-10 00:01:27
Originally Posted by TOOQIKK
what about my questions?

what are the specs on the turbo? You will need at least 72lb injectors.
2010-09-10 16:27:54
well let me go see! lol brb
2010-09-10 16:57:44
garret part number 466159-5003 a/r on intake .60 on exhaust side .62
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