After playing with a couple EFR turbos, I'd be inclined to look at a GTX anyway...

 

Ut oh. Why's that?

Precision 4828.

 

BW s256?

 

BORG WARNER S366

 

Even an s256 would be fine, probably a better choice than a non-GTX Garrett.

 

If you want lowend grunt and crisp resonse, the s366 is definitely the way to go.

 

Not to derail the thread, but this is the first time I have heard anyone blaspheme the mighty EFR on MT.net.

Interested in your experiences.

 

+1

an angry mob is already assembling

 

Yeah I was just mentioning it out of curiosity. I have a lot more work to do on my car before I replace my hot side. I know because of soviet everyone lusts over the efr & it does look like a great turbo. I'm really curious though about the billet precision & gtx. They appear to be comparable.

Don't mean to derail but Jeff's (drift) build is about the only gtx info I've seen and it looks just as legit as the efr. Him and soviet both have real build with quality parts (and appear to know what they're doing).

Anyway... I do like the look of that manifold. Looks way more serviceable.

 

Isn't Jeff's build based on the 2.5 MZR engine? Not at all comparable to the BP... Or am I confused?

 

He has a bp4w w/ a square top. See the BP stamp?

 

There are others too, soviet just happens to have pretty dyno plots vs everyone else either has clips filmed with a potato, or a plot that looks like it was drawn on a napkin by a kid having a seizure, or is limp pee pee cause the person doesn't have the ***** to run ALLOFIT

Both turbo's show great results on other platforms too, though I'd have to say the EFR still seems to dominate on other platforms as well. Everyone raves about "dat response". Building an insta-5psi on throttle tip in def sounds delicious to me.

 

I fall into the last category. Comments of people who drive my car are still along the lines of, "it doesnt drive like a turbo car, you hit the pedal and it just goes, and goes and keeps going, and you think you should shift because the needle is off the tach but you havent hit redline yet and its still going."

 

From Jeff's sig:

I think that BP you posted was his old engine. Unless he went BACK to a BP after going to the MZR. Did he have the GTX on the old BP as well?

 

https://www.miataturbo.net/build-thr...a-72354/page2/

In January he posted pics of same motor. plus mzr has reversed exhaust and intake and i do not see such. don't know man. Also:

Final numbers: 374whp/331wtq @22psi on a gtx2860 .64

 

that's a different Jeff

You said Jeff talking about jbguillo. I said Jeff talking about turns101, Jeff Abbott.

Indeed. Carry on.

 

This does sound awesome. I did read your comment about your car feeling better than someone else that had a gtx leafy but they have an fm log and hopefully a big enough exhaust? according to the dyno from the drift car it looks like it should similar spooling and response no?

 

Something along the lines of dyno Garrett, replace with BW, make less power with more boost and less response. As in fail all over.

I have dyno plots, but not the customers' permission to share.

In the next couple weeks, we'll be tuning a car that just had a Precision turbo replaced by a BW EFR. I have fingers crossed.

 

I'll be very interested in the results as I am currently running a precision 4828.

 

I assume said experience is on a BP or B6 and not on some other platform with limited relevance to our application? Having driven lots of small GT25 Miata and one poorly tuned Borg EFR Miata, the suggestion that the EFR has "less response" is really hard for me to stomach.