my stock turbo has started making a high pitch whistle when spooling up/ under boost so I figured I needed to start planning a swap out; I've got a Turbonetics Hybrid that uses the 89-91 style exhaust manifold but im not sure what size/ power output it is. Im.running the stock 550cc injectors but I've got 720s but need to figure out what all I'll need in terms of fuel. There's no markings on the turbo itself unfortunately.

I'd appreciate any help.





for comparison

 

If you measure the actual compressor wheel inducer diameter and compare to old T03/4 maps you will get a reasonable idea. Worth checking if it's actually a TA34 turbine or whatever people used to use that was larger than the factory ones in machined factory turbine housing too as that will let it make more power too.

 

Do yourself a favor and put that turbo in the bin. Get a new turbo with current gen turbo tech and better/larger fuel injectors and you'll thank yourself down the line once your build comes to fruition.

 

+1 there are a ton of old threads about these too. Compressor housing is a T04B, and then typically its going to be a V trim or 60-1 compressor although there are/were more choices
the TA34 turbine wheel was a direct drop in, although sometimes people would keep the stock or clip a stock turbine wheel.

its old school, but its a around 300hp@15psi, which is pretty fun.

 

Thanks, it took awhile to find a SR44 battery for my micrometer. 357 battery fits as well appearantly. cool I wasn't wanting anymore than 300hp so that's great. now that's ive got my measurements, I'll see whatvi can find in the older threads.

the exhaust side has the hitachi "Impact" style turbine, so I think it's just the factory from a series 5. but I'll double check once I make sure there's actually an issue with my stock turbocharger

 

its the big boy,

 

thanks for the flow rate map. I just gotta learn how to read it lol. im hoping to stay between 250 to 300hp. Wastegate opens again 9 or 10 psi. I tested it yesterday

 

Thanks for all.of the help but if i could.ask.for one more favor...That link is a video of that new whistle sound my turbo started making a couple days ago. If anyone could give a listen and let me know if they think it's a bearing. I tried looking for leaks since I just changed some vacuum lines last week, but the noise started afterwards and all of my hoses and clamps are tight as of thus morning.

 

measured the exhaust side today and the exhaust side of a series 4 turbo. here's the numbers for anyone interested.

 

Edit.

didn't look closely nought at both photos, that's major diameter 64mm not minor? Should be ok for your target power anyway.

 

yea 64mm at the widest, 54mm at the narrow