Over-Rev Disaster?

NoDOHC · 08-31-2009, 06:47 PM

I don't know what the sleeves are made of, but a pneumatic chisel makes very short work of them.

I am not theorizing here, I have done it several times.

An NA housing can easily be drilled for the water passage to the turbo.

Really, turbo housings are the same as NA housings, with a little additional machine work (drill hole out, remove diffuser)

I had trouble with the roll pins, but I didn't try the MIG and vise-grip idea.

edit: there is no difference in the sleeve (except for the diffuser) and the NA sleeves flow just fine (once the difuser has been removed).

The turbo port timing is identical to the NA.

The REW port opens earlier, hurting fuel economy, raising EGT and mildly improving flow.

Here are some pictures:
NA Sleeve
NA Sleeve.JPG
NA Sleeve w/o diffuser
NA-diffuser, looking in.JPG
Turbo Sleeve
Turbo sleeve.JPG
Streetported turbo sleeve
streetported turbo.JPG
RE/REW ?? on left, NA on Right
REW next to NA.JPG

08-31-2009, 06:47 PM	#1
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 18	I don't know what the sleeves are made of, but a pneumatic chisel makes very short work of them. I am not theorizing here, I have done it several times. An NA housing can easily be drilled for the water passage to the turbo. Really, turbo housings are the same as NA housings, with a little additional machine work (drill hole out, remove diffuser) I had trouble with the roll pins, but I didn't try the MIG and vise-grip idea. edit: there is no difference in the sleeve (except for the diffuser) and the NA sleeves flow just fine (once the difuser has been removed). The turbo port timing is identical to the NA. The REW port opens earlier, hurting fuel economy, raising EGT and mildly improving flow. Here are some pictures: NA Sleeve NA Sleeve.JPG NA Sleeve w/o diffuser NA-diffuser, looking in.JPG Turbo Sleeve Turbo sleeve.JPG Streetported turbo sleeve streetported turbo.JPG RE/REW ?? on left, NA on Right REW next to NA.JPG __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic) Last edited by NoDOHC; 08-31-2009 at 07:16 PM. Reason: Add info