What size is the wheel on the GT3037R?
I looked on the Garrett site but all they list are the GT3071R and GT3076R.

On the Full Race site they list the GT3037 as GT3037/GT3076/GT3040.
Are the 3037 and 3076 the same?

 

Very similar, but the Exducer on the compressor wheel is SLIGHTLY different. GT3037 76mm, GT3076 76.2mm

 

I asked this very same question to TheShodan a few hours ago.

Im wondering how much difference the .2mm makes.


Modified by Muckman at 2:02 PM 2/23/2006

 

is the inducer the same as well? for all practical purposes then, they could almost be considered the same then.

 

They ARE the same! 3037 is just HKS's gay name for their version of the 3076.
http://www.hksusa.com/products/?id=1671 76.2mm

Just like the GT3040 is really a GT3082 and a GT3540R is really a GT3582R. They are just confusing names that some ppl use.

 

The fact of the matter is that both the Garrett GT30R (GT3076R unit number 700382-12) and the HKS GT3037 56 trim use the same Garrett 700177-0007 cartridge or CHRA . HKS also market its GT3037 with 48 and 56 trim compressors though I don't think anyones sighted the 48T version so far . For the record the GT3037 52T's cartridge number is 700177-0006 , its supposed to spool ~ 500rpm earlier that the 56T GT30R/GT3076R/GT3037 and be good for ~ 400 at the treads . Its been said that the 56T compressor pushes it closer to 500 naturally with larger a/r turbine housings .

The following is from a HKS catalog :
GT3037 48T 76.2 x 52.8 GT37 compressor , (.61 a/r GT30 turbine housing) 420 PS.
GT3037 52T 76.2 x 55.0 GT37 compressor , (.73 a/r GT30 turbine housing) 440 PS.
GT3037 56T 76.2 x 57.0 GT37 compressor , (.87 a/r GT30 turbine housing) 470 PS

Also note the 52T version usually wears a .50 a/r TO4E comp cover where the 56T version has a .60 a/r port shrouded cover .

Tis my firm belief that HKS's spool and respond better than their Garrett cousins generally because they use slightly smaller trim versions of the same size/family compressor . The fact that they often use port shrouded compressor covers probably helps as well . Also my opinion that many of HKS's own turbine housings suit the higher exhaust temp petrol engine environment better . Its been said that they also may have a slightly better volute and nozzle section that Garretts diesel housings . This is not to lay the boot into Garrett but I think they are after volume sales and the Diesel market is where thats at .

Cheers A .