N/A street build up
#1
Don't hate my V8
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N/A street build up
hi, i dont actualy have a N/A RX7 but my friend has a 86 base that took a **** and are puting a bandade motor in it while we are rebuilding another on. We want to make it as streetable but as fast as posible w/o nitrous or any forced induction. he is what we have come up with so far (just internals): Atkins Rebuild, Street port, and E-shaft, rotors, counter weights from a RX-8. i was wondering mostly if the RX-8 inerds have been tried befor and with what sucsess? we are also going to have other upgrades to suport the engine, 225walbro, low imp. 550cc injectors, rtec7 stage 2 (N/A), racing beat exhaust (already have), HKS intake (already have), and phat 10mm plug wires (already have). i was just wondering what all ya'lls thought of our plan.
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Where to start... the RX-8 internals are overkill and a waste of money. It is very slightly lighter and has very slightly higher compression, neither of which will make much difference at all, especially not for the money involved. I would try to find s5 rotors, but even s4's should be fine if ytou can't find s5's for cheap.
The best thing you can do for power is a street port (which you are already getting) and get an s5 UIM so you can take advantage of the VDI. The s5 UIM is good for a dyno-proven 15 HP, which is a pretty big deal for an NA rotary.
Also, the fuel crap is another big waste of money. No NA rotary will need extra fuel unless it has a bridge port or better. I guess since you are getting the Rtek, you might as well get the 550's if you can control them, but it will run rich even on the stock 460's. The Walbro is totally unneeded. If you really want extra fuel, you can get a used TII pump, which is a hell of a lot cheaper.
Just for comparison, my old engine was streetported and it was running pretty damn rich just in the stock setting. Most NA rotaries will actually get more power form LESS fuel, and yes it has been proven on a dyno.
Spend the extra money you would have spent on a good suspension, you will much happier.
The best thing you can do for power is a street port (which you are already getting) and get an s5 UIM so you can take advantage of the VDI. The s5 UIM is good for a dyno-proven 15 HP, which is a pretty big deal for an NA rotary.
Also, the fuel crap is another big waste of money. No NA rotary will need extra fuel unless it has a bridge port or better. I guess since you are getting the Rtek, you might as well get the 550's if you can control them, but it will run rich even on the stock 460's. The Walbro is totally unneeded. If you really want extra fuel, you can get a used TII pump, which is a hell of a lot cheaper.
Just for comparison, my old engine was streetported and it was running pretty damn rich just in the stock setting. Most NA rotaries will actually get more power form LESS fuel, and yes it has been proven on a dyno.
Spend the extra money you would have spent on a good suspension, you will much happier.
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Don't hate my V8
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suspention is already coverd, its got tokico HP shocks, eibach springs, and no name front and rear strut bars. we just need new back tires because the rears are bald . thank you for your imput so far. i think we are still going to use the RX-8 parts or get S5 rotors. but we might just sack the comp mods and run stock.
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I'd say that the rx8 e-shaft isnt a waist of money, .6lbs of less rotating mass will spin the rotating assembly faster, and if your NA and want power you probably will end up with running minimal accessories to minimize drag, not to mention if the engine is apart already 200 dollars (or less, im not sure on the exact price but mazdatrix has it cheaper than OEM w/ employee discount by a few hundred dollars) I hope if you want NA power and a rebuild and all that you upgrade your clutch assembly, and go with an aluminum flywheel, your engine will rev up really quick and freely.
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#9
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Sideways7 spelled it out pretty well up there ^. In addition to that, if your rb exhaust doesn't include a rb tube header, you might upgrade to that. It flows much better than the stock "log" manifold. You might also want to use 460 primaries due to the fat bottom end, and then 550 secondaries for the top end with your streetport.
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suspention is already coverd, its got tokico HP shocks, eibach springs, and no name front and rear strut bars. we just need new back tires because the rears are bald . thank you for your imput so far. i think we are still going to use the RX-8 parts or get S5 rotors. but we might just sack the comp mods and run stock.
Don't buy a CAI, its a wast of money, and will add weight you don't need.
Don't get an exhaust bigger than 2.5 if you want to drive it on teh street and not rock the dead
DON"T rely on tokico, or any other shock/spring combination. Even cheap coilovers have all their components designed together. Springs/shocks are never a 100% matched combination, and will not give you the camber, height, stiffness, rebound control you need.
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Ummm you should check out my thread https://www.rx7club.com/2nd-generation-specific-1986-1992-17/n-street-ported-engine-second-time-683537/ i'm bound to make atleast 220. I think that is a guess.
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Ummm you should check out my thread https://www.rx7club.com/showthread.php?t=683537 i'm bound to make atleast 220. I think that is a guess.
I must say though you're off to a great start.
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