1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Odd idea...what do you think?

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Old 02-01-05, 01:57 PM
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Odd idea...what do you think?

I have been thinking a bit. Is ther or is it possible to have a individual or tri throttle body intake? I mean like have the two middle ports as a primary running the stock port shape and everything, and using long narrow intake runners tuned to the port. and then have a larger throttle body for each of the outer ports, and have the runners short and large diamater, and the port like a large street port or some sort of big port.

I was just htinking it would be cool to have a N/A car with awsome throttle response and also a great high end.
Old 02-01-05, 09:11 PM
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Sounds like you want some Hilborn EFI stacks on it,eh?
Its possible,anything is possible if you can think it up.I wouldnt bother with throttle body injection in the GM sense of the term.It'd be more like individual throttle bodies with individual port injection in each runner.Thats much less restrictive than planting a big injection body right in the center of the bores like GM/Holley did.
If you can make it work and get all the tuning right,that'd be awesome.I have seen individual stacks and injectors on a rotary,but never unequal length tuned stacks.Check out Hilborn's website for a brain storm.........
Old 02-01-05, 09:19 PM
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This is similar to the 89-91 N/A 13b (and Rx-8, I think) with it's variable intake length, except the Mazda version still feeds all of the ports all of the time.
Old 02-01-05, 10:12 PM
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Yep.The TII and SE/S4 N/A intakes also make use of dynamic supercharging,just by design though,without the active valve.
By far the coolest intake would be on the 787B 4 rotor.Telescoping velocity stacks that move with the throttle plates to keep the intake at optimal tune.If youve never seen them working,or heard that sweet engine under power,check this out.Its quite long and in Japanese,but the audio of that car is just killer.....

http://www.mazdarotaryclub.com/speci...phicTV-02.mpeg

Last edited by steve84GS TII; 02-01-05 at 10:29 PM.
Old 02-01-05, 10:16 PM
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yeah...no way would i want a gm style injection. i was also thinking maybe the 2ndary throttle bodies could be vaccume activated...more like lack of vacumme...sorta like the nikki's 2ndaries, but EFI..maybe that is too complicated.

If i could get 2 set of different tuned length runners set up, i dont think it would be too unreasonable. hardest part would be coming up witht he right ECM and setting the linkage up right for the whole thing.

I know Jenvey has a range of individual TBs and you can also chose a wide range of linkage syles for them too.
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