Chewbaccsw5

So I have a 90 turbo TII and I was wondering if I took a picture could anyone tell me if the turbo on the engine is stock? It seems large and I wonder if it is aftermarket (despite it's wear) and wasn't tuned right which caused my engine to blow a rear rotor...if you can't tell from a picture is there a serial number I can look for or anything?

RotaryRocket88

iTrader: (7)

Sure, post a picture.

For reference, this is a shot of my stock S5 turbo during my build. A stock turbo will say HT-18-2S on the compressor cover.

Raegio

That is for sure not the OEM turbo. seems like a BNR

RotaryRocket88

iTrader: (7)

No, it's a stock turbo in my picture. A T04b compressor housing is much larger.

Chewbaccsw5

Here is a snap shot on my turbo...it seems larger to me. I wonder if it is aftermarket if it was tuned right and that caused the engine to go early.Then again I have no real support for this idea

Chewbaccsw5

Im not sure why it turned it sideways, sorry that doesn't help at all

RotaryRocket88

iTrader: (7)

A shot from the front would tell me more, but judging from the wastegate actuator, how it's mounted, and the look of the compressor cover, that's a stock S5 turbo just like mine in the pic above.

The only way that could be aftermarket is if the inside of the cover was machined for a larger compressor wheel (ie BNR stage 1). The stock inducer is ~43mm, but T04b wheels up to ~60mm can be used.

cycodelico7

the turbo seems stock to me. its just hard to tell completely the picture is not as clear

Chewbaccsw5

Ok, and is there a way to tell if the wastegate actuator is functional? I wasn't able to get it to move any way so I didn't know if that would cause any problems. Ill have another picture from the front most likely tonight.

RotaryRocket88

iTrader: (7)

The spring in the actuator is stiff, so you'll have to pull on the arm pretty hard. If you have a small hand pump / bike pump, you can apply pressure to the actuator to watch it move. Just don't apply a ton of pressure, as you could damage the diaphragm. The arm should be fully extended by 6 psi.