Incon Turbo Sizes
From what I have gathered the Stage 1 used a modified GT35 (gt2535???) that used a slightly modified T04B housing with a T28 exhaust housing. Stage II added a piggy back computer to controll two additional injectors which were mounted on before the MAF. Stage III was never built but there was a larger turbo option which used modified GT37. The GT35 would support 700hp and the Gt37 would support 900hp. Corrections and additions welcomed 
Originally Posted by Chrisrokc
What turbo sizes where there for Stage 1, 2, and 3?
Incon had 2 sizes but was originally going to have 4. 2 turbos, each with 2 different turbine housings.
1. GT2535 CHRAs – w/ T03B Compressor housing machined to fit, and T25? exhaust housing machined to fit .
Note: GT2535 is the INCON Model# and .GT2571RL is the Garrett Model#
2. GT2537 – CHRA #700177-0011 same exhaust w/ TO4S Compressor housing.
and here are the details on these:
....................<<<<<<<<<<<<>>>>>>>>>>>> <>
CHRA.....Wheel Trim...Model....Wheel Dia....HP.....Flow lbs....Trim.....Wheel Dia
700177-0011…52....TO4S.....(2.17/3.00)...475.……50...........90…..(2.11/2.22)
37's have a little more lag on take off, -(1/2 second more spool time)- but make up for it on the top end.
Teching In
Joined: Jun 2003
Posts: 13
Likes: 0
Incon's terminology was designated as GTBB35 for the turbos using the 446179-32 cartridges. The GTBB37 was the use of the 700177-11 cartridge. There was no correlation at the time between Garrett's numbers. Similar to HKS using their own designations like 3037. While some might think these were just remachined housings, they were not. If you take a T28 turbine housing and an Incon housing you will notice they are not the same thickness as the incon was quite a bit thicker for better placement of the turbine wheel. This positioned the turbo forward over 1/4 inch more than a comparable T28 turbine housing while leaving the exhaust flange in the same location. The compressor cover also was similar to the t04B BUT was built with a slightly different casting and machining of the bolt pattern. This could be why Gary "Red WS6 99" had issues with nearly every bracket on his install using standard t04b covers and t28 turbine housings.
The stages were simply;
Stage 1 GTBB35 turbos (capable of 760-800hp) with no emu (option GTBB37)
Stage 2 GTBB35 turbos with emu (option GTBB37)
Stage 3 GTBB37 turbos (capable of 950-1000hp) with emu and some other stuff
Hope this clears up any questions.
The stages were simply;
Stage 1 GTBB35 turbos (capable of 760-800hp) with no emu (option GTBB37)
Stage 2 GTBB35 turbos with emu (option GTBB37)
Stage 3 GTBB37 turbos (capable of 950-1000hp) with emu and some other stuff
Hope this clears up any questions.
Thread Starter
On The Tree
Joined: Apr 2004
Posts: 142
Likes: 0
Thanks guys! Reason why I ask is because I have a trip to Japan Planned this winter and while I am over there I am going to try and find some of these for a decent price. My buddys friend over there is in the turbo biz and is going to take us out racing some so I hope to ask him if he can hook me up.
