Turbonetics turbo help

[sleepy350]

Hey guys,

I'm piecing together a turbo kit for my E30 and I pretty much jumped the gun and I bought what I believe to be a Turbonetics 60 series T4. It has a 0.96 AR exhaust housing and I know thats too big for the M20. Would I be able to run this on my M20 with a smaller housing or should I be shopping for a different turbo? I've attached photos so hopefully somebody can help me ID what I really have here.

note: compressor backing plate is anodized blue and on the compressor housing there is what looks like "60.1" but it has been polished so its not too clear






Thanks in advance guys!

-Angelo

[cleanasse30]

The 60 series compressor is a tad big for a 2.5 liter m20 @ 14psi imo. The turbine housing looks like it says its a .86 A/R based on the 3rd pic, which will probably give some turbo lag and spool late. It will work, but sizing your turbo really depends on what you intend to use the car for. If you want something fun on the street, you would be better off getting a smaller turbo. If you want a track monster where you are mostly driving in high rpm's this turbo will probably work well enough for you.

[ForcedFirebird]

Actually the 60 series compressor is good on an m20, but that exhaust side is large. Just finished a tuning and installing an MS on a customer's car using a t3 (.83ar) Super 60 Turbonetics. He only has a MBC and 5psi spring, so I could only tune it to 10psi - it was making full boost about 3500 and made 255whp/288wtq with a fairly conservative spark table (93 pump gas). This is actually just below the turbo's efficiency range, it's happier at 1-1.5bar.

[sleepy350]

Thanks guys. I'm pretty sure it's a 0.96 A/R turbine housing, it was hard to get a clear pic of the inside stamp but its pretty clear in person. So lets say if I did run this turbo what size housing should I get? 0.68 ish? Would anybody just try to run it and see what it does?

[cleanasse30]

Actually the 60 series compressor is good on an m20, but that exhaust side is large. Just finished a tuning and installing an MS on a customer's car using a t3 (.83ar) Super 60 Turbonetics. He only has a MBC and 5psi spring, so I could only tune it to 10psi - it was making full boost about 3500 and made 255whp/288wtq with a fairly conservative spark table (93 pump gas). This is actually just below the turbo's efficiency range, it's happier at 1-1.5bar.

When I plotted the 60 series on a compressor map it was off the island in the lower rpm range just slightly at 1 bar, but it isn't far off. I'm sure it would be a fine turbo, just depends on your goals for the car. It def needs at least a bar of boost for it to make real power though, 10 psi is kinda low for this sized turbo as you mentioned.

ForcedFirebird has more experience with this kinda stuff than I do though, so keep that in mind lol. I'm still in the middle of my build so I haven't vetted all my assumptions and research.

Thanks guys. I'm pretty sure it's a 0.96 A/R turbine housing, it was hard to get a clear pic of the inside stamp but its pretty clear in person. So lets say if I did run this turbo what size housing should I get? 0.68 ish? Would anybody just try to run it and see what it does?

I went with a .63 A/R AGP turbine housing on my S256sx, although i've heard the AGP housings act bigger than they are. You could at least try to run the turbine housing you currently have, but if its truely a .96 A/R it will fully spool pretty late, likely in the 4k+ range. Anywhere in the .63-.80 A/R range will be a good fit from what I've found during my research.

[ForcedFirebird]

When I plotted the 60 series on a compressor map it was off the island in the lower rpm range just slightly at 1 bar, but it isn't far off.

Exactly