RX8 13B Engine into a FD RX7
#1
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RX8 13B Engine into a FD RX7
Hey
As 13BREW's become rarer and more expensive, I'm wondering if anyone has actually attempted to put in a Renesis 13B engine into an FD?
It's obviously NOT the perferred engine, with reliability, design issues and a performance disadvantage to the FD's 13BREW.
But, it might be a future alternative to keeping the FD on the road, with a rotary?
SORRY if this has been covered - I did search.
As 13BREW's become rarer and more expensive, I'm wondering if anyone has actually attempted to put in a Renesis 13B engine into an FD?
It's obviously NOT the perferred engine, with reliability, design issues and a performance disadvantage to the FD's 13BREW.
But, it might be a future alternative to keeping the FD on the road, with a rotary?
SORRY if this has been covered - I did search.
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AndyMac (04-10-20)
#3
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#4
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Rebuilds are very affordable. I'd avoid the MSP engine at all costs unless it was going to be an NA 3 rotor. Boost and an MSP is like swimming against a current imo.
Last edited by fendamonky; 04-11-20 at 08:07 AM.
#5
Racing Rotary Since 1983
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(Renesis) "reliability, design issues and a performance disadvantage to the FD's 13BREW"
that may be the greatest understatement ever on our board...
looking down the road good old capitalism will provide the answer with non OE 13BREW substitutes.
that may be the greatest understatement ever on our board...
looking down the road good old capitalism will provide the answer with non OE 13BREW substitutes.
The following 2 users liked this post by Howard Coleman:
F1blueRx7 (04-15-20),
Nakd n Fearless (04-11-20)
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as an aside the Rx8 engine in the FD would be really fun, its like an Rx8 that is 500lbs lighter...
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we did a Nasa race of Mazda challenger race challenge (it was something like that), and the cars were all 6 speed NC cup cars, 2650lbs. that is like turbo FD territory... the ND cup car was 2 seconds faster at laguna too (this was 2015, so before the ND was on sale) the door was $1600!
<edit> Mazda race of NASA champions, race
<edit> Mazda race of NASA champions, race
#12
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The RX-8's engine is a pretty peaky non-turbo engine. Doesn't have a lot of low-end power. The FD's twin setup fills in a lot of torque down low.
Also the RX-8 is only about 200-300 pounds heavier than the FD. Mazda still does an amazing job of saving weight on cars.
All that said the RX-8 engine is pretty much strung out where it is. Bolt-ons will only make a small amount of extra power (like 5-10hp), even porting doesn't add much power. A simple downpipes and cat-back on the FD will add TONS more power. Also the RX-8 doesn't respond well to turbos, it has to be a VERY mild turbo or the engine will be a hand grenade. There's a reason RX-8 guys do REW swaps if they want to make power.
I did see an FB at DGRR one year that had a full RX-8 engine swap - all the manifolds, everything working. That would be a fun time in a 2100 pound FB and suits that car well.
Basically, it's not worth swapping in an engine that makes less power and has far less potential to make power when modified.
Dale
Also the RX-8 is only about 200-300 pounds heavier than the FD. Mazda still does an amazing job of saving weight on cars.
All that said the RX-8 engine is pretty much strung out where it is. Bolt-ons will only make a small amount of extra power (like 5-10hp), even porting doesn't add much power. A simple downpipes and cat-back on the FD will add TONS more power. Also the RX-8 doesn't respond well to turbos, it has to be a VERY mild turbo or the engine will be a hand grenade. There's a reason RX-8 guys do REW swaps if they want to make power.
I did see an FB at DGRR one year that had a full RX-8 engine swap - all the manifolds, everything working. That would be a fun time in a 2100 pound FB and suits that car well.
Basically, it's not worth swapping in an engine that makes less power and has far less potential to make power when modified.
Dale
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they do, the Rx8 is like 18" longer than the FD, and has 47 airbags, and all the other modern distractions too, its really light for what it is.
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see it seems pretty good, 1080kg is good too
#17
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In the RX-8's defense I wouldn't call a 3000 pound car a "damn cow" - most modern cars are WAY above that. The FD is about 2800 pounds give or take with options. The one thing the RX-8 has going for it for sure is it really has a great chassis and handles well.
Dale
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+1 the average new car weighs as much as a small moon. the Dodge Challenger is 5,500lbs! even the 1983 Mercedes its based from was only 3500lbs..
#19
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I have brand new Mazda oem 13brew motors for $4699.I sell RX-8 msp Reman motors for $4399 currently. There was recently a significant price jump on the msp motors, while the rew motors have held relatively consistent over the past few years. In my opinion going with the msp motor would be a significant downgrade. rew motors from the factory typically dyno at 215-220hp while msp motors struggle to make 180hp. The msp motors were built for cost savings and emissions. The housings tend to wear out much quicker than in an rew motor. The mounting is also completely different as they mount by the center iron like the fc motors vs the rear. There are plenty of rew motors available as well as much aftermarket support.
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hard part is the wiring, and that you need both cars
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