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  #21  
Old 06-18-2009, 10:30 AM
SuperTurboD24T SuperTurboD24T is offline
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Quote:
Originally Posted by Slobodan View Post
The Hitachi turbo is actually just Garrett parts that hitachi threw together. I just used the compressor backing plate, comp wheel and housing. The rest is the stock centre cartridge, turbine unit. I noticed it taking a little longer to build boost up to 6psi then after that it just bolts towards 12psi like no other.
As is the case with a larger turbo It is a trade, but if you have the hardware to support it, a good trade. Turn up the fuel, fit a charge cooler, and you will get back some of the losses you noticed. Of course, a compressor with more suitable pressure characteristics would be best, and it seems you are searching for such a combination (less total flow, greater pressure ability).

This information *should* be true, if Mazda's engineers spec'd the turbo for the 13B properly. Normally, they are very good at this.

I would probably try to increase the boost in stages, with a commensurate increase in fuel, and see how the engine responds, whilst watching the EGT. It might work well for you.

Yes, a T31 style turbine housing will fit the downpipe flange directly.
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  #22  
Old 06-18-2009, 07:04 PM
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Quote:
Originally Posted by SuperTurboD24T View Post
25+ psi with the stock turbo (and it's associated BMEP) has been proven on stock engines.
Sorry for my ignorence, but what does BMEP stand for? I'm really suprised that the engine can handle 25 lbs of boost with a stock gasket and head bolts. Over on the VW 1.6 side, I have always heard more than 15 or so would blow the gasket. There are guys over on vwdiesel.net that are blowing the stock gasket with studs at 25lbs of boost. When you say stock gasket, do you mean stock like original, or the stock replacement thats stainless?

Jason
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  #23  
Old 07-07-2009, 06:19 AM
reed reed is offline
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Running 12-13 psi stock. Im thinking of runnig about 32psi. j/k
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  #24  
Old 11-11-2010, 11:33 AM
nick nick is offline
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Quote:
Originally Posted by Jason View Post
Sorry for my ignorence, but what does BMEP stand for? I'm really suprised that the engine can handle 25 lbs of boost with a stock gasket and head bolts. Over on the VW 1.6 side, I have always heard more than 15 or so would blow the gasket. There are guys over on vwdiesel.net that are blowing the stock gasket with studs at 25lbs of boost. When you say stock gasket, do you mean stock like original, or the stock replacement thats stainless?

Jason
(BMEP) Brake Mean Effective Pressure

I got a quote from Raceware for studs: $290.

Did you use this part number for the ARP studs?: 204-4706
What about the washers and nuts?
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  #25  
Old 11-12-2010, 04:29 AM
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I bought my studs off a guy, they are the ones everyone has been using for the past few years in the vw diesels, its the cosworth kit. I just found out that ARP came out with a vw diesel specific head stud set. They are higher strength studs and are sold for 1.6 and 1.9 TDI applications. I would call ARP directly and buy them, your going to need 1-1/2 sets, and I don't know of any retail places that will break a set. I don't think they normally sell direct, but if you tell them the situation they will sell them to you rather than loose a sale to some other brand. My friend Alex did it and they were happy to help out. The 12pt nuts and washers come with the kit.


Here you go:


Jason
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  #26  
Old 11-12-2010, 04:30 AM
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They are slightly stronger than the ford/cosworth kit. The paperwork with my studs said 200,000psi, these are 220,000. Not huge but every little bit helps I suppose. Don't know the price though. If they are way extra expensive I would probably just buy the cosworth kit.

Jason
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Back again with a '84 760 GLE D24T/ZF

SOLD but not forgotten! 1984
760 Sedan, built D24Tic/ T-5 swapped

My engine build: http://www.d24t.com/showthread.php?t...t=engine+build
T-5 swap: http://d24t.com/showthread.php?399-W...to-quot-w-pics!
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  #27  
Old 11-12-2010, 04:59 PM
EvoStevo EvoStevo is offline
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Jason, do you have any more info on the Cosworth kit? I didn't know there were any other options other than what ARP sells.
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  #28  
Old 11-12-2010, 06:08 PM
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Untill they came out with the 1.6/1.9 diesel specific kit, they were the only studs that ARP sold that worked in a VW diesel. They are the 12X1.75mm thread for the block and the correct length. There may be almost no difference in price between the new ones and the ford cosworth ones.. Not sure on that.

Jason
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Back again with a '84 760 GLE D24T/ZF

SOLD but not forgotten! 1984
760 Sedan, built D24Tic/ T-5 swapped

My engine build: http://www.d24t.com/showthread.php?t...t=engine+build
T-5 swap: http://d24t.com/showthread.php?399-W...to-quot-w-pics!
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  #29  
Old 12-10-2010, 03:33 PM
HetLaeN HetLaeN is offline
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i am running 58psi on stock studs and the thickest stock headgasket not blown anything apart yet :P
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  #30  
Old 12-11-2010, 04:21 AM
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Nice! My kinda boost... What combo of turbo/pump mods are you running?

Jason
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SOLD but not forgotten! 1984
760 Sedan, built D24Tic/ T-5 swapped

My engine build: http://www.d24t.com/showthread.php?t...t=engine+build
T-5 swap: http://d24t.com/showthread.php?399-W...to-quot-w-pics!
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