Bbundy is that plot from a 2.0 or 1.8?

Yes the graph was with the 2.0L. I lost some torque with the stock bottom end but it cirtainly dosn't feel like that much. Maybe 30 or 40 ft-lbs and a few hundred RPM in spool. I havn't had it on the dyno with the stock bottom end. 2.0L is rebuilt and going back in now.

Bob

If BBundy's manifold were mirrored, it put back instead of forward, I don't see any reason it wouldn't be at least AC compatable. Of course, if it were exactly mirrored it would likely hit something, but I mean as a starting point.

With the turbo that low there is issues with the steering shaft in moving it back. I did a lot of fiddleing befor finalizing my design but the plan all along was no AC or power steering.

Bob

Yes but that dyno was from the stroker.

You know I have been looking and

In terms of spool and response I’m thinking this turbo would blow my 3071 away. Smaller turbo but should flow just as much, better bearings ceramic ball, better seals, light weight titanium turbine wheel forged and milled compressor wheel

http://www.full-race.com/store/turbo...258-turbo.html

Looks like I’t would be dam close to bolt on for my manifold and 3” V band downpipe comes with a well designed internal waste gate geometry in an investment cast stainless turbine housing.

Bob

That's the one I'm looking at for after I'm done with my 2560. I'm waiting to hear back from Full Race about transitional response data, if they get anything to me I'll post it here.

Next time I need a turbo Im pretty sure that is what it will be. Transisional response must be phenominal the spinning bits have to be way lighter. The wate gate design and flow path into the 3" v-band outlet looks better than most people can configure on an external one.

Bob

See this thread here. Miata turbo EFR wankfest:

https://www.miataturbo.net/showthrea...489#post683489

Did more slight tweaks tonight and got some measurements. No reason other than to bump my own pics & continue a hijack for my own potential customers reading this thread. :greddy:
Equal length runners of 14.350", 240° bends

Twin Scroll equal length of 17.240", 3 of the runners have similar bend radius/amount, the #2 primary has about 40deg's more bend but it's a larger radius so it should cancel out somewhat.

A/C P/S next.

I can probably send you an iges model of what I did.

Bob

Please don't do that. I do not want to give Tim even more of my hard earned money then I already am.

Sure, i'd be good to know the turbo position. Can't hurt! I don't necessarily want to directly copy yours however, even if it works great.

AC PS version. 15.310" equal lengths but requires a fun IWG mount or EWG, and a lower radiator hose solution.
http://www.inoneear.com/outtheother/...0collector.jpg
I think I'm done. :ban?:

Looks like a good candidate for those Borg Warner EFR turbos. Twinscroll, internal wastegate. Yeah baby!

Tim, I may owe you some money soon.

I was just looking at mine and if I shift the turbo back not only does it interfere with the steering shaft it hits the sub frame. I remember now and even if you did manage to move it back there was no really clean way to rout piping from the compressor outlet. It was designed in 2004 and originally built it in 2005 so it's been a while but I spent a lot of time planning out and test fitting before I made it. I re-built at the beginning of 2008.

I just got thru remaking the lower radiator pipe solution. The heater core hard line fits better than how I had it and I finished it up so it looks like a custom casting.

Bob

Your waterpump inlet looks pretty sweet! Nice job on that. Can I have one?

That above AC PS ramhorn puts it the same spot as my 'shortram' AC PS which I've only done one of and that was with a 2560. It fit with a decent amount of room however. I'm supposedly making a vband version of it (the short ram) with a 52T 2871 soon.

Without AC PS and a larger turbo, your manifold makes a lot of sense. The long BW EFR turbos should fit easily on yours :)

Tim, was the 2560 setup for me much different that a 2871 or 3071 regarding runners, etc?

For those interested, Tim was able to allow me to keep A/C, PS, AND ABS. The ABS was a monkeywrench.

It might not be all pretty like the ARTech Ram Horn, but the power delivery is incredible! Braineack and some others have driven it. I'd totally go to Tim for future turboing. Except next time I'd get a 94-95 Miata so I don't have to deal with OBDII.

It's... beautiful! What do you think about leaving the collector divided with 1+2 on one side and 3+4 on the other to keep the pulses from 1 and 4 heading toward the turbine and not each other? Or placing the turbine flange further down to allow the runners to remain more separated through the turn?

Without PS, will that fit an BW EFR? I checked out the specs and the 6258 is 53mm longer. Haven't been able to get any diameter data, though.

2871/3071 shouldn't affect the runners at all (unless someone wanted 1.25" pipe instead of 1.5"). The 3071 compressor might hit stuff but that's why I use tial's compact 3071 compressor on my low mounts.

Thanks for the props! I also worked around the cruise control even though I forgot to hook up a vacuum line and it never worked and you removed it instead :(

If you actually could see a cross section thru the collector on that manifold there's really no way pulses from 1 could significantly affect cyl 4 and vice versa. By the time they are all blended each primary is directed downward similarly to a standard proper collecter, but of course in an arc still. Like a curved standard collector where all 4 pipes blend in along the same plane...yeah.

But a thin sheet could be placed between each/any primary (make a cut with a band saw or cutoff wheel, slide in a .060 sheet, weld from outside) for more "flow directing" but IMHO if anything i'd make it worse not better. Then again it could work great, don't really know until it's tried.