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Old 08-04-14, 19:45   #1
rb3torana
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Turbo upgrade or not?

Ive currently got a ebay gt45 on my car making abit over 600 flywheel hp. The specs on the turbo are

compressor: 69-98mm
turbine : 77.5-98mm 1.05 split t4

It was making 600 on 32-33psi, I recently wound it up to 35-36 and it definantly feels stronger. But Im just unsure why its taking some bigish boost to make the resulted power and Im thinking it could be turbo efficiency. Its got a long runner intake on it similar to the rajab design and the plugs are even.

Im looking at the ebay gt42 which is

compressor 74.8-102mm
turbine 75-82mm 1.05 t4 split.

Im just wondering if yeah the compressor will flow more but will it choke in the rear with the smaller turbine? Cheers
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Old 11-04-14, 07:49   #2
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Give the proboost gt42 a go that will get it going 76mm front wheel and not so bad for lag either i have never had an issue with mine good bit of gear
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Old 11-04-14, 10:57   #3
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Do a bit of reading on compressor maps, a lot of the big turbos don't even wake up until 40+.
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Old 11-04-14, 17:55   #4
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yeah I've had a look and its hard to tell what map to use but using the 68-1 map its off the top of it already lol. The gt4202 is still nicely on it but still unsure on how the more restrictive turbine will affect power? The 42 has a curved turbine with a higher trim than the 45 with straight blades and lower trim. It would be nice with a turbine flow map aswell lol. Cheers
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Old 11-04-14, 21:09   #5
Jet R31
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the turbo your using is a turbine/compressor mismatch(ebay gt45, Y2000K etc, all same..)

they work decent(not fantastic) on rotarys and v8s' due to the larger than gt42 turbine

the comp wheel is nothing special lb flow wise so its always going to be the killer and its always going to be lazier than it should be due to the oversize turbine.

its probally taking biggish boost as its a non gt old school comp wheel...

on u.s forums they say the comp wheel is closest to the masterpower T70 from memory(just what i have read)

back in the old day Ta45s used 40psi to run 9s @ 140mph in vls and C16
a GT 4294 will do the same on 10 psi less...

the 76mm ones are a much better comp/turbine match, but thats also a big
stepup in turbo sizing.... the S trim 75mm gt4202 turbine woudn't affect power at all, the turbine you have is to big already
cheers
darren

Last edited by Jet R31; 11-04-14 at 21:14.
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Old 11-04-14, 21:39   #6
rb3torana
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Is there such thing as a too big turbine wheel compared to compressor yet the whole idea is to have minimal backpressure as possible? Looking at the ebay gt42's which have the same specs as the gt4202r Im thinking they must be a fair copy and probably a better match for my setup.
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Old 11-04-14, 21:49   #7
Jet R31
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of course there is, you just run out of compressor flow, or over turbine and make no more power than a smaller setup and a lot of lag

depends on engine size and ve, changes with every motor

same with exhaust housings, you can over exhaust housing a turbine wheel,
does same thing..

the turbo you have is well known to be over turbined, for a 6 cyl is would be better teamed with a 68mm Q trim turbine i would think
cheers
darren

Last edited by Jet R31; 11-04-14 at 21:52.
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Old 11-04-14, 22:13   #8
rb3torana
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I was thinking the compressor would have to be struggling with the massive turbine on a smallish engine lol. Thanks for clearing it up mate. Cheers
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Old 12-04-14, 20:12   #9
Jet R31
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i look forward to seeing what you do next!
cheers
darren
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Old 12-04-14, 21:17   #10
rb3torana
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Hmm prob see how far i can go before it runs out of compressor which i think im virtually
at lol. Gona change the gears n let it rev abit. Cheers
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