Quote:
Originally Posted by WRX06TR
I am definitely no help with Garrett Turbos. I have been on their page to try and understand their numbering and lettering for turbos and I'm still lost on it. But allow me to introduce more abstract and most likely pointless ideas. Element Tuning has been doing great with some of the Time Attack events.
Its basically a 20g, but the have pulled some great results out of their STi.
http://elementtuning.com/Turbocharge...bochargers.htm
Its probably just a Garrett Turbo with an Element Tuning sticker on it and marked up $300 bucks, but I'm trying new ideas 
Just wondering, but would you benefit from some sort of Meth injection or do you already have it? |
A 20g turbo is a Mitsubishi turbo, not a Garrett... they're the factory WRX turbos:
TD04-13g = stock WRX turbo
TD05-20g = turbo on my car right now
TD06-20g = the most popular Mitsu turbo for the STi right now
Then there's the IHI turbo line, which are the VF's:
VF22 = the original "big" turbo for 2.0L WRX's, I think it came on the original STi
VF39 = the stock STi turbo '04-'05
VF42 = the stock STi turbo '06-'07
etc.
And the Garrett turbos are GTxxyyR, where xx is the frame size, yy is the compressor wheel size, the R on the end means it's a ball bearing turbo.
So the GT3076R that I'm looking at is a GT30 frame, with a 76mm compressor... and I'm looking at the .82 A/R, which is Area/Radius, and it relates the size of the housing to the size of the compressor or turbine. Since A/R on the cold size isn't very important, when people are talking about AR's they're pretty much always talking about the hot-side turbine A/R. In general the larger the A/R the more flow the turbo will have, but it will also have more lag.
So basically, this thread is really about what hot-side A/R I should be picking for a GT3076R turbo... MikeK posted some dyno charts of the two turbos, but like Matt said, without knowing the details on the two cars, it's hard to make a comparison. All I know is that the .82AR seems to peak only about 250 rpm later than the .63AR, and since I know it's a much more capable turbo at higher boost on 100 oct, I think taking that 250 rpm hit is probably going to be worth it overall.
But back to the nomenclature, the GT52 is a misnomer, since it's actually a GT30R with a 52 lb compressor... since it's not actually made by Garrett (it's just made of Garrett parts) it's received a name for marketing purposes.