[stroked87]

Ok. I think I have a Y2K 91mm. The Serial number is: T-25189. On the front of the compressor there is a number engraved in it that is: 21403 and there is a DR on it also. I opened it up and did some measuring, the inducer measures: 91.01mm - 117.57mm or 3.58" - 4.62" and there is a T stamped in the wheel. Now, the turbine side is a little different. It does not have a T stamped or cast into the housing. It has a A/R 1.08 cast in it. The measurements on the exducer wheel are: 83.95mm - 92.67mm or 3.30" - 3.64"

I am trying to figure out what I have here. I didn't see any of these numbers in the catalog on here. What trim is the turbine? Is it a true 91? By the serial number on the turbo it is a Y2K 88mm. Any help here would be greatly appreciated. Thank you.....Mike>>>

[stroked87]

Really? No responses? Anyone?

[Robert]

Well based on serial number alone I would have said it was a Y2K T88 with a .96 A/R housing but if the engravings are correct it looks like the turbo might have been rebuilt with new parts. The engraving on the front indicates its a 91mm HP-91 21361 4.50" 21403 and the A/R stamping means the turbine housing was changed.

[stroked87]

Excellent. Those were the answers I was looking for. I was told it was a 91mm and wanted to verify that. It is going on a 363ci small block Ford. Should be a fun combo.

[Robert]

Originally Posted by stroked87

Excellent. Those were the answers I was looking for. I was told it was a 91mm and wanted to verify that. It is going on a 363ci small block Ford. Should be a fun combo.

Indeed!

[stroked87]

Took some compressor pics. There is a T stamp in the wheel and a number: 40235