New Bb Gt37 Turbos .

[discopotato03]

Hi all , Garrett has released three versions of their GT37 turbine based ball bearing turbo built around the same (I think) centre section as the GT40R (GT4088R) .

I think they were aimed at the American gargantuan "Diesel Pickup" market ie Ford F111 ... and Dodge Cummins Ram etc .

The good news is that the GT37 turbine is in 78 trim rather than the GT bush bearing versions 84 trim . I feel this turbine is a modern replacement for the BB T4 P trim (76T) found in the TO4Z cartridge and their T4 P trim/60-1 version of the "T3/T4 R" series hybrids . The GT37 turbine is ~ 72.5mm OD (inducer) so just under the P trim T4's 74.4mm .

The US Truck vendors quote them as being stage 1 2 3 and as near as I can find these are the specs .

St 1 GT37 72.5mm 78T turbine with 82mm 50T compressor

St 2 GT37 72.5mm 78T turbine with 82mm 56T compressor

St 3 GT37 72.5mm 78T turbine with 88mm 52T compressor .

The specs I've seen show stage 1 and 2 having a .89AR ratio turbine housing and stage 3 a .99AR ratio . From fitting pics the turbine housing is twin entry T3 flange and integrally waste gated but don't know if its in one side or both . Compressor cover is port shrouded with the outlet having I think a V-band flange .

Itys hard to say but possibly Garrett lifted the compressors from : (St1) their bush type GT4082 , (St2) their GT3540R/GT3582R , (St3) their GT4088R .

Performance shops in the US ie AMS have been quick to offer versions with different housings for Drag Evo's amongst other things . I think they used some sort of Mitsy turbine housing and the TO4S comp cover and offer it as a direct replacement for their vewrsion of the GT3540R/GT3582R .

If Garrett or HKS can make us GT style turbine housings in useful AR ratios this turbo would fill the void between the GT3540R/GT3582R and the GT4088R . In fact the stage 1 and 2 may be even better than the GT35R in some circumstances . A reprofiled turbine housing from the XR6T would be convienent if could be machined to fit and ways were found to clamp it to the bearing housing . Possibilities .....

Cheers all , A .

PS : had some part nos but not at hand atm , later .

[rb26s13]

so roughly wat sorta power rating will these come in at

[discopotato03]

so roughly wat sorta power rating will these come in at

The turbobygarrett site under Power Stroke Diesel quotes 250 , 350 , 450 Hp but huge torque on I think 5.9-7L Diesels . The compressor maps for their GT4082 , GT3582R , GT4088R should give you an idea of how much air they can pump at given pressure ratios (boost pressure) . I have not confirmed if these are the actual compressor wheels used but its hard to believe otherwise ATM . If thats the case then around 550 , and in the 650-700 range for the stage 2 and 3 . Early days for this series ATM .

Cheers A .