I've been kicking this around a bit recently...

After searching, all I can find is that the differances between a 13B-T and 13B-REW are.....

Single vs. twin turbos
~5psi

And thats all I can find.

Now hypothetically, if I were planning on a, say, T76 anyway, wouldn't it be smarter to go 13B-T with a standalone instead of dishing out the money for the REW and just ditching the expensive twins?

What about installs into a FB? As the sticky points out, none of us need any more info on a 13bt into a fb, what about a rew into a FB? (I think there was a thread about this a few months ago, but I can't find it quickly, and Im tired )

 

As far as I know, the 3rd gen block has a different seal design. I think they reduced the seals from 3 piece units to 2 piece units. Perhaps that's their source of such premature failure.

 

The Cosmo 13b REW is the better way to go using a single turbo. Installation is basically the same as the 13bt.

There is plenty of info on the forum on how to do it, but as a starting point look at the posts from Mike-28- P as they contain great photos.

 

VERY different engines. (However, Speider, all engines from '86-up, turbo and non turbo, use the SAME apex seal - part # 11-C000-N3F1)

Here's a nice writeup on the differences Series 4 vs. Series 5 vs. Series 6: http://my.engr.ucdavis.edu/~pko/13BTvs13BREW.html

I'd have to say, go 13B-RE (Cosmo twin turbo).

 

the rew has a different front cover bolt pattern, so you can't just put an older (79-85) front cover on it.
also the fd motor is not that much better, to be almost $1000 more than an 13bt or a cosmo engine.
mazdatrix uses real mazda numbers but they put the first bit at the end so 11-c00-n3f1, is really n3f1-11-c00.
they do it because they are tricky, and because you sort the munbers by the middle and then the last, then the first.

mike

 

if your going to use a t76, your going to need a built motor and you might as well use a RE block. its got that purdy upper manifold also a better rear housing which supposedly resists cracking from detonation. the twins can be sold to recoup money spend too. as far as installation same 13bt equipment applys as stated in the sticky

 

With the 13B-RE:
My SE front cover fit perfectly, and the Oil Pan Fit perfectly. It was a perfect fit with all the SE parts, including the oil OMP lines as well.

I did tap the front cover for an oil return though, even though the 13BRE also has a REAR oil return on the housing (for the twins), I chose not to use it.

 

the fd's have 2 small oil returns, while the 13bt has one big one. the cosmo has one big and one small (i think), also the twins use a larger oil feed line, thatn the 13bt

mike

 

All true, man mike you are like a rotary dictonary!
When I went to put on my front cover on my 13B-RE I was thinking "hey I don't need to drill/tap a hole in the GSL-SE front cover there is a rear oil return I can use". Too bad I didn't think about how much a exhaust manifold was going to get in the way of a oil line at that time But I did happen to take out my OMP shaft so I may turn my block off plate into a block off plate/oil drain manifold for my turbo. The only bad thing about doing this is the oil drain isn't going to be as far down as I'd like.

 

Anyone know why the 13B-REW has more hp and tq than the 13BT

 

Higher compression, bigger ports, twin turbos and more boost.

 

I was initially planning on using the 13bt for my swap but decided to go with the rew b/c I got such a great deal on it.
I did a lot of research on the rew install but there was little information to be found. Right now I am in the middle of the swap. Would anyone be interested in a write up? Most likely I will have it done in 2-3 months.

I just like the fact that the rew has "evil twins"!!!

 

yes, exactly!

 

this is what i want to hear because i'm thinking about getting an -RE at some point for a future project.

 

so will the 13BT be reliable if you up the boost and ported the houseings?

What about the intake for the 13B-REW, will that fit onto the 13BT?

 

"I just like the fact that the rew has "evil twins"!!!"

they were evil all right. The fact that they are the main reason for 3rd gen motors blowing up at around 30-40k. I would not suggest using known faulty factory twins on any project.

 

yes (the short answer, without me going off on the silly notion of the 13BT being unreliable)

yes.