Building a better/mongrel turbo at guv-ment cheese prices...
Building a better/mongrel turbo at guv-ment cheese prices...
I just bought a trash Evo IX turbo (binding shaft) for too good a price. I already have a nice VIII turbo in running shape and have read that the standard operating procedure is to just swap the cold side onto the VIII turbo, which results in a de facto IX turbo. While I have it out, I am going to port the hot side and do the spring upgrade to the stock IX BPV actuator.
Are there any other mongrel upgrades you can recommend to be done while I am in there? Any other options at compresssor/turbine wheels?
Are there any other mongrel upgrades you can recommend to be done while I am in there? Any other options at compresssor/turbine wheels?
Have you compared the size of the two center sections? I don't have two handy to look at, but I seem to remember that the diameter of the flange where the compressor housing side to the turbo are different between an VIII to a IX... could you confirm?
THE DIFFERENCE BETWEEN 8 AND 9 TURBO.
both have 10.5 hot side. both have unaltered turbine wheels. both use the same chra, this means you can swap and mix and match these two turbo's parts to your heart's content (tme9 plug inserted here).
the cold side is the only difference. 9 cold side housing has a larger diffuser, this is the snail section, it's both longer and wider in diameter inside, this creates a faster boost up/boost production/boost response. as a result of the added length of the snail section also known as diffuser, the overall housing is larger. the exducer of the 9 turbo is larger to fill up the space inside of the 9 housing (see below for caveats). the inducer remains relatively the same size.
the reason for br moving to 9 housing is to remove all chances of surge on his and now fp's wheel, larger housing also allows more air through even though the wheel that the 20gs are using is based off the old 8 housing which would leave exducer diameters smaller!
small things that are different. the angling of the turbo oil lines is slightly off due to the 9 housing size. the angle of the coolant line is also a bit off. these two can be bent to fit. the cold side outlet pipe is much different and you can't bend this unit to fit it between the two turbos. so the outlet elbow pipe is the only thing you need from the install kit. everything else can be bent to fit.
both have 10.5 hot side. both have unaltered turbine wheels. both use the same chra, this means you can swap and mix and match these two turbo's parts to your heart's content (tme9 plug inserted here).
the cold side is the only difference. 9 cold side housing has a larger diffuser, this is the snail section, it's both longer and wider in diameter inside, this creates a faster boost up/boost production/boost response. as a result of the added length of the snail section also known as diffuser, the overall housing is larger. the exducer of the 9 turbo is larger to fill up the space inside of the 9 housing (see below for caveats). the inducer remains relatively the same size.
the reason for br moving to 9 housing is to remove all chances of surge on his and now fp's wheel, larger housing also allows more air through even though the wheel that the 20gs are using is based off the old 8 housing which would leave exducer diameters smaller!
small things that are different. the angling of the turbo oil lines is slightly off due to the 9 housing size. the angle of the coolant line is also a bit off. these two can be bent to fit. the cold side outlet pipe is much different and you can't bend this unit to fit it between the two turbos. so the outlet elbow pipe is the only thing you need from the install kit. everything else can be bent to fit.
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Doesn't sound like the cartridge sizing is different; from another forum:
both have 10.5 hot side. both have unaltered turbine wheels. both use the same chra, this means you can swap and mix and match these two turbo's parts to your heart's content (tme9 plug inserted here).
both have 10.5 hot side. both have unaltered turbine wheels. both use the same chra, this means you can swap and mix and match these two turbo's parts to your heart's content (tme9 plug inserted here).
OIC.
Looks like I jumped the gun then. Oh well, it appears I will have jump into the old color debate, now...
My interests are 400HP, lightning fast spool and full boost everywhere. Probably a white then. I figured a hot 9 would get close but since this 9 is crap, probably best to just bite the bullet and send it to FP or somesuch that can bless an Evo9 turbo w/ superpowers.
Looks like I jumped the gun then. Oh well, it appears I will have jump into the old color debate, now...
My interests are 400HP, lightning fast spool and full boost everywhere. Probably a white then. I figured a hot 9 would get close but since this 9 is crap, probably best to just bite the bullet and send it to FP or somesuch that can bless an Evo9 turbo w/ superpowers.
Last edited by kenikh; Jul 14, 2009 at 07:27 AM.
Well, since you are looking at having to send this in for balancing and mongrel upgrades; Wanna guinea pig how it does with a five degree clip on the turbine?
If on the 8, how would one go about doing the clip without upsetting balance?
The wheels are the same. The cartridge backplates are different.
The only thing you can do is put VIII parts into a IX turbo and have it balanced.
Okee doke; no need to reinvent the (compressor) wheel, I guess. 
I guess I will just keep running the 8 until I can get to having the 9 rebuilt to another spec.
BTW, I have searched the crap out of this site and can't seem to find a comprehensive thread on the "fast spool" turbo options. Everyone seems to agree the FP White is a great option, but side by sid comparos of similar turbos, as well as basline comparos to stock EvoVII/IX turbos is something I can't find.
I know I don't want the Red.
Any pointers?
Interesting reference points from the FP site:
It is interesting that the Evo X and FP white curves are nearly identical, with the Evo X showing some superiority. I would bet some of this is due to Mivec's effect on cam timing.
I guess I will just keep running the 8 until I can get to having the 9 rebuilt to another spec.
BTW, I have searched the crap out of this site and can't seem to find a comprehensive thread on the "fast spool" turbo options. Everyone seems to agree the FP White is a great option, but side by sid comparos of similar turbos, as well as basline comparos to stock EvoVII/IX turbos is something I can't find.
I know I don't want the Red.
Any pointers?
Interesting reference points from the FP site:
It is interesting that the Evo X and FP white curves are nearly identical, with the Evo X showing some superiority. I would bet some of this is due to Mivec's effect on cam timing.
Last edited by kenikh; Jul 14, 2009 at 09:26 AM.