13BTT? Will it work?
 

I just recently bought a 04 Mazda RX-8 and I am very happy. Heres my question. I love the 7. The engine code as you all know is a 13BTT while the new 8 is a 13B. Will the 13BTT from a 7 fit into the same mounts a the 8's 13B? Will the mounts still work but need relocating? Has anyone done this yet? If you guys could help me out that would be great.

the search is your friend, i think someone already asked this question....+ why would you wanna go twin turbo??? to many problems, people now a days just go one huge ass turbo...

that is on thier 13bs from the 7s

It's not a direct swap. I don't see the point, imo, the Renesis is a far better engine and is only getting better as time goes on - just like how it worked with the REW.

Now, let me go and hide before all the REW fanbois that never even owned a RX-7 attack me...:lol:

its a turbo rotary, thats what made it sooo special, but just like every stock turbo car, its nothing without the FI, low compression ratio = higher boost pressure, 13brew was a low compression turbo rotary, our renny is much higher in compression giving it that "200 + horses" all motor...

That increase from 9:1 compression to 10:1 compression was just one piece of the puzzle, and imo, a small one. Based on conventional cylinder pressure calcs the gain was probably 3-4% more power for that 1 point of compression. More port surface area and higher revs, etc...played a larger role.

The answer to your question is an emphatic No. You will need custom everything... just the wiring alone will be a nightmare.

Why did you buy an Rx-8 if you like Rx-7's so much ? Should've just bought an FD for $12-15k. But it will cost you as much or more than an '8 to maintain... it takes someone with deep pockets and a lot of patience to own one. And the engine code for the Rx-7 twin turbo motor is technically 13B-REW versus 13B-MSP in the Renesis. The Renesis gets most of its power (Versus older naturally aspirated rotaries) from its well-tuned intake system, not the compression ratio, which was increased from 9.7:1 in the n/a '91 engines.

The Renesis and 13B-REW can't even be compared. Yeah they're both 13B engines but that's about it... completely different design philosophy and different generations of technology. An REW just won't pass modern emissions standards, but with light mods it will make more power than a Renesis with one of those $5000+ turbo kits, at least until something breaks on it again.

Here's one:

http://www.autotechmotorsports.com/project-rx8.htm

Wow. Autotech did a great job on that conversion. but I'll have to second everyone else.... a 13B-REW in an 8 is not worth the time or money. (they bill $19,000 for the conversion). For $8-12 depending on level of tuning you can have a Mazsport kit that get you reasonably close.



besides... if you're gonna go thru all the work to make a 13B-REW fit in your 8... you might as well have just used a 20B longblock instead. would have costed about the same and be a hell of a lot sweeter and more powerful.

That is an interesting point which boils down to the 13brew and 20b conversion and pointing out both's advantages and disadvantages.

The 20B advantage would be power potential in the high end. But the 13rew will probably be just as powerful on the bottom end where for "daily street driving" its spends 95% of its time.

For spare parts availability, the 13brew has readily available parts compared to the 20B. If your 13Brew blew a motor the parts are easily available. If you blew your 20B, good luck on finding the intermediate housing where it holds the bearing for the shaft.

The 13rew has "matured" after market product line compared to the 20B which is mostly custom works. Reputable after market companies such as Apexi, HKS, Greddy has invested technology to support this engine. In addition, for turbo selection, there is tremendous amount of knowledge and data out there with regards to what works and what doesn't. Enthusiast had actually tried and shared their results publicly. These turbo's kits are cost effective and does not cost 9 grand that don't even break the 400rwhp mark.

Balance and weight wise, the 13Brew would probably sit at the same position as the 13bren without further modification work keeping the excellent balance and weight of the RX-8 the same. The 20B will need more work to fit this properly plus you will end up with a heavier car off-seting the cars balance and handling.

For gas economy on the daily driving basis, the 13Brew definitely not as thirsty as the 20B.

Cost wise, for sure to set up a 20B "properly" would definitely be more custom work and more expensive project. A 20B can be installed on the RX-8 but to really install it properly and to get the best out of the RX-8 handling as the car was intended to be, that will be a more involve project and would cost more.

ive always thought that the heat generated from thoose twin turbos was at times way too much for the engine to handle and thats one reason the tt rx7 engines were blowing up... if that indeed was true y not stick to boosting a renesis with 1 turbo and upgrade waterpump/radiator and maybe a vented hood to help cool the thing? wouldnt it be more reliable?

The 20b is more powerful at all times over the 13. Without a turbo on either engine, or with a turbo on both. You're just assuming the 20b has a giant ass turbo slapped on.

If you read that link, they piggybacked the Rx-8 PCM with a presumably modified OEM FD engine harness and Apex'i Power FC computer. That must've taken a long time to figure out... There was no mention in there about oil pan, motor mounts, subframe, etc and how exactly they did all that, or how they made the FD's fuel system work with the returnless system on the '8 (the 8 is returnless right?).

that's the point I was getting at. If you consider the complexity of doing a 13B-REW swap, the you could put almost any motor in there with the amount of work that was required. Everything is going to be custom anyway.

I don't think so --the PFC is a stand alone and plugs right into the FD engine harness.The question is what did they do for instruments etc.

It was a 13B-REW, but the point is, just put a turbo on the renesis and call it a day.

Some off you might not know but 20b parts are available to buy to the general public with the help of mazdatrix. They sell all the plates for the 20b including the 80mm fat plate.

idiots =/
 

you should email pulse performance in wanganui nz. the builders of mad mikes rx8. they are going to be doing my 13btt swap. all you need is the 13btt engine mounts slightly modified and will fit strait onto rx8 gearbox. or if using 13btt gearbox aswell the power housing needs slight modification aswel. worst part is the wiring. but these num nuts'z must be going to most rip off mechanics in the world!! 19k my ass. picked up my 13btt with gearbox for $2500 an instalation is going to cost me 2-$3000 and thats nz dollars. stuff paying 10k for a rx8 turbo kit that dont do jack shit. 13btt will blow it away any day off the week

^ You are the idiot. What ECU are you going to use to run the engine genius? And what about the gauges, traction control, etc. etc. etc. That and the fabrication needed is where the cost comes in. In addition, you would be retarded to put in a used 13B-REW without having a proper rebuild done on it and the Turbo(s).

he bumps a 3.5+ year old thread to call *them* idiots, for teh luv of love self pwnage :lol:

Um Dude?

You just bumped a 4 year thread to tell them to email someone?

--- edit
Damn Team beat me to the burn

I'll be extremely surprised if that $5500 does not turn into $15000 before you know it . Even if it is done well I suspect you will have major compromises to deal with .

If you want to see what a 320whp renesis goes like I am in Hamilton.

IMHO if I take my Renny out to swap something in it's going to b the 20B.....and a huge turbo haha

20B+GT4092r turbo=street car? ROFL