Holset turbo sizes?
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TECH Apprentice
Joined: Jan 2007
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Holset turbo sizes? is there a place i can find compressor maps for holset turbos, im doing a super budget setup and holsets are easy to find cheap and ive saw some good numbers and reliability, but id like to look at maps and see how they fit
if anyone has suggestions, im trying to find a good fit for 3 different possible setup, a twin or a single front mount, possibly a rear mount on a forged 370 with meth injection. running pump gas, stalled auto tranny, i havent decided if i want to go th400 or 4l80 yet though. it may end up being ran on a stock engine for a little while until i get the 370 built, it just depends.
thanks for any help, Mark
if anyone has suggestions, im trying to find a good fit for 3 different possible setup, a twin or a single front mount, possibly a rear mount on a forged 370 with meth injection. running pump gas, stalled auto tranny, i havent decided if i want to go th400 or 4l80 yet though. it may end up being ran on a stock engine for a little while until i get the 370 built, it just depends.
thanks for any help, Mark
Teching In
Joined: Sep 2009
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http://www.holset.co.uk/mainsite/files/index.htm
It can be hard to find maps for Holset turbos. They dont like to publish this information freely. Here are a few...
http://www.dieseltruckresource.com/d...-t255049.html?
It can be hard to find maps for Holset turbos. They dont like to publish this information freely. Here are a few...
http://www.dieseltruckresource.com/d...-t255049.html?
Teching In
Joined: Sep 2009
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Here is a good write up about mapping.
http://www.mayfco.com/turbocal.htm
I thought about using HX35's for the same reasons as you. The problem I ran into is how large the frame is. In a hacked up drag car, you could prolly wedge 2 of them in there.
On The Tree
Joined: Nov 2009
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I'd run a HX55(72mm) single setup. Twin HX35's(56mm) would be nice but they are large frame turbos with very large compressor covers for a 56mm wheel. I would quess that a HX35 is about as big externally as a MP70. Here is a pick of the HX35 on my nissan 240.... It's a big turbo for a T3 flange....
Last edited by S13LSx; Mar 16, 2010 at 07:53 PM.
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Teching In
Joined: Sep 2009
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Rule of thumb is 1.5 CFM per HP (approximate). To be more accurate, you need to map your combo.
HX55 is a (physically) LARGE turbo. I think there are better options.
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I run a HX60 on a 383 LS1 at 12 psi (for now). No intercooler - just E85 and meth/water injection.
No dyno numbers but my "feeling" compared to my old 570 cid NA 866hp engine - I am guessing around the same HP number.
Going to crank it up to 17-18 psi for the coming season.
Not a lot of dynos available over here in Norway.....
No dyno numbers but my "feeling" compared to my old 570 cid NA 866hp engine - I am guessing around the same HP number.
Going to crank it up to 17-18 psi for the coming season.
Not a lot of dynos available over here in Norway.....
Teching In
Joined: Sep 2009
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They are also known for having fantastic reliability when used for what they were designed for. Which is not sled pulling. Either way, to have a shaft break, IMO it was abused.
