Which Garrett turbo, which BW turbo?

Forget talks of manifold designs and turbos lets take it back to the very basics.

Will the kit have a bunch of the hdr fittings like we are used to seeing on the rest of the kits or will they have actual welded barbs and proper one piece fittings?

Yes, it was a BP. Yes, it directly relates. Let me see if I can get the owner's permission to share the details.

Interested to see this Ben, since the EFRs have better compressor geometry and larger turbines compared to their compressors than the garrets and less rotating inertia I'm failing to see how both of those things could happen at once, I could believe seeing one, either less response if you started with like a GT12 or less power/boost if you stated with like a GT3576R.

The Garrett turbo was one that is commonly used on Miatas. If I get permission from the customer (who previously asked me specifically to NOT share his comparison plot), I will post it up.

Why do people not want to share plots and dyno information? If they are racing I don't see how a simple dyno plot is going to give out any private information about the tune.

Maybe its a case of upgrading from a 2560 to a 6258, running low boost (10psi?), and expecting higher numbers at that low boost and better spool from a much larger turbo?

Maybe, but I made 250hp on a dynapac with 10psi with the 6758.

Nope. Plus built engine, 20+ psi boost on the EFR. The results were surprising.

Wow, I would love to see that.

Access granted. Built BP-Z3, +1.5mm 8.8:1, MS3X EMS; GT2560r (solid) vs EFR 6758 (dotted). Boost was a few psi less than I remembered, but you should get the idea:

https://www.miataturbo.net/attachmen...1&d=1403019383

Are there knock off EFRs now? I believed that graph right up to 3700 rpms. Well except I dont believe that a 2560R could make that much power on the DIYAT dyno, which is supposed to be a super heart breaker.

335/325 out of a GT2560R @ 19 psi? you're smoking crack. That's like 70 more ftlbs than the max i've seen.

fucking cool as hell though.

That's...... bizarre.

That does look kinda weird tho, it just goes limp past 5k. the efr should be nowhere near maxed out

must have been a leaky nitrous bottle being stored next to the dyno.

Right. My 2554 holds up top better than that. And better than the 2560 on that chart.

Those torque numbers don't gel either. Smells like FM's dyno.


Ben, are you sure those numbers aren't like.... those turbos on an F2T?

Maybe mods split this out? I feel like I want to ask more questions but I will only be cluttering up the BEGI thread.

Especially since DIYATs dynapac supposedly reads 16% lower than a dynojet, that would be like basically hitting 380hp on a dynojet with a 2560R, thats NitroDann territory.

They must have found and plugged the leak prior to the EFR run.
:laugh: