It's my thread, do what you want. Post cats, dicks, spew obscenities everywhere, i don't care in the slightest.

Your comments make me LOL. I was wondering why my nitrous bottle was empty. It's a BP-Z3 is installed in a Lotus7 replica. Packaging is much better, exhaust is MUCH better. Motor is well prepped, not stock.

How do the torque numbers "not gel"? You know that horsepower is derived from torque and RPM, right?

There's no level of impropriety in the plots; I don't sell turbos or have an agenda. If you feel like an EFR is a good choice for you, go for it. In this test, the EFR lost power, both on the actual and butt dynos. The car's owner is registered on this forum and he'll post up if he feels like it.

Theres just no way, no matter how good your exhaust is, that you can make a 32lb/min turbo make 325whp on a heart breaker dyno, especially not with a BP. And that you can fail to beat that with a much more efficient 53lb/min turbo is just mind boggling.

I know how horsepower is derived, i'm just saying that the torque number you got out of the 2560 is pretty much unpossibru, and it's weird that it falls so hard. I can't understanding losing almost 100wtq from peak to redline on a built BP with any EFR.

I actually remember you posting a similar 2560 making 325whp in a Locost/Lotus/Caterham thing awhile back... this the same car?

Can you get permission to post pics of the manifold and exhaust? I want to see what better and MUCH better looks like.

I bailed on a GT2560R in favor of an EFR6258 specifically because of the limitations we've traditionally seen out of the 2560. The information you've posted does not match what we've seen out of either turbo, so please do not take our skepticism as personal attack. We are just trying to understand.

How much power did Paul make on his 2560 & AbsurdFlow setup? AFAIK that's as good as it got with a 2560.

+1 to all of what G said

Paul's best was somewhere around 311rwhp@17psi. on a dynojet with 93 octane, MS2. '99 engine, BEGI cast intake mani. but 304rwhp at 14psi at the same day, so it was at it's limit. I think torques were around 260's.

E85 + MS3? I don't know. I trust Ben but that's nuts.

If legit, i want to drive that car. I bet it's horrifying.

http://s95367906.onlinehome.us/photo...vs-400whp.png?

Red line is Soviet's car on gas IIRC. 84mm bottom end, stock BP4W head, EFR6758, 400whp@20psi. Just sayin'

I thought 400whp was at something closer to 26-27psi (maybe even 29psi) for soviet on pump gas.

No, that was the max power ALLOFIT run.


Look at the top of the picture, gives details on the red line run.

It is HRK's locost that Ben is talking about and this is the build thread for the locost7. Here is the original dyno thread from last year where the 2560 dyno was first shown.

Wait, this manifold or something else?

https://www.miataturbo.net/attachmen...ine=1355459277

https://www.miataturbo.net/attachmen...ine=1355459277

6758 may be a better choice, but IMO the 6258 leaves something to be desired.

I think the big question is, what makes your experience so different? Normally a 10 PSI 2560 setup makes about 220 whp. But a similar setup at 10 psi on the 6258 bends rods.

Why?

I'm also wondering why a 6258 on a "better" built motor would spool shittier than a 6758 on a somewhat half-assed motor (no offense to Soviet.)

because math

oh wait

Our dynapack doesn't seem to let little motors spool up as well as actual driving does.

What 6258 setup bends rods? Who else has done a comparison, same car, same dyno, same motor?

I have complete faith in the dyno results because I was there. Everybody expected the BW EFR to blow away the Garrett. Everybody was surprised when it didn't.

Pretty much everyone on this site who has put any EFR on a stock motor has ended up with bent rods, regardless of boost level.

you can fix that you know. dynapac gives you to power to hold the car for a second or two before starting the pull and it allows you to control the length of the pull. When I dyno'ed at a spec miata shop on a dynapac they only had it setup for SMs and I really didnt want to make a 25 second long 4th gear pull, with 7 a second hold at the start of the pull. So I think I dropped it to 3 seconds and a 15 second long pull because those were the numbers I pulled out of my ass on the spot.