I'm slowly getting all the parts together to build a ported engine, I'm wanting a very agressive street port. My turbo housing are on the way, which plates would you use? I know the 89 on up rotors are the better ones to get but, I don't think I'm going to be able to afford those, any suggestions... Also which LIM would you use? I guess that depends on the plates though...



If anyone has any tips let me know, as far as better parts.



Thanks in advance

If you're going to be strictly N/A (no nitrous). There is no reason not to use the 89 N/A rotors.

If you want a very aggressive streetport, I'd think you'd want to use turbo plates (4 port) as they have lots of meat. Although some people like the 6 ports.



If I were to go with a lightly street n/a, I'd use a 6 port.

For a large streetport or bridgeport, I'd get a 13BT Jspec, sell the turbo manifold, turbo, and rotors. Buy s5 n/a rotors and rebuild and port it.



You could always bridgeport the 5/6 ports like Ito and Mazdaspeed7 have done. Those engines seem to have tons of potential for N/As

Oh and a warning, I have no experience porting, or rebuilding any sort of engine, especially rotary engines.

I only know what I've read and what I've asked.

In fact, I think my RX-7 (series 4 base automatic) is a shitbox



Do you think I've helped you in any way with my previous post and response?

Thanks,

Ben Martin

Ok so if I go with turbo plates which LIM would work with the stock EFI?

N/A- https://www.nopistons.com/forums/pub...IR#>/angry.png



Your going to miss out on all of the forced induction fun. https://www.nopistons.com/forums/pub...#>/biggrin.png

With turbo plates you're going to need the turbo intake manifold because it has 4 holes and the 6 port has 6 holes plus VDI and other ****.

I have used a rather odd way around putting the N/A upper intake on a 4 port turbo engine. If you can get the lower half of the Racing Beat Delorto sidedraft intake made for an early 13b (like RX4 and cosmo of the 70's) it will bolt to the 4 port turbo engine. Then you can bolt your upper intake off an S4 to that. That was how I had fuel injection on an '88 TII engine in an MGB for a long time before I went to a TII intake and Paxton supercharger.



You know, that may not be totally true - I may have made an adapter plate to bolt the two together. I seem to remember making a 3/4" thick adapter because the bolt holes didn't all line up... This was all in the early 90's - and have tried so many combinations since that I don't remember for sure!



Jason

They use adaptors like that to fold FD UIM/SurgeTank's to BT LIM's

Ok hold on in english please... What's a VDI? https://www.nopistons.com/forums/pub...1047683561.gif



?????????????????????????????????????????????????? ????????



Would anyone happen to have one of those manifolds?



Thanks

VDI is used in the 89+ NA EFI.You shouldn't need to worry about it because you have S4 EFI.Its in the haynes manual/