icaneat50eggs
icaneat50eggs Dork
9/20/20 5:24 p.m.

My son and I are putting together a 95 miata for his first car.  We picked up two project 95 that both had bad head gaskets and sent the better of the two to the machine shop and had the head refreshed.  I bought a 99 head and intake and was going to use it, but it turns out that it was cracked and unuseable.   once we get it up and running stock I'll be hitting up flying miata for a turbo, and swap over to a megasquirt,.

 

So my questions, Is it worth trying to use the 99 vics intake with a turbo on top of a 95 head?  would it still produce the mid range torque bump that it does with the 99 head?  (I would imagine it would, but there could be something with the difference in head designs that changes the frequency the pressure waves travel at.)

 

If it is worth it,  my first look makes it seem like the heads are machined slightly differently between 99 and 95 and I'm having trouble getting the 99 fuel rail to align like I think it should.  Is this a real issue or am I messing something up?  

Finally is the 95 computer going to have issue controlling the 99 injectors?>  there flowrates ar slightly different.

Keith Tanner
Keith Tanner GRM+ Memberand MegaDork
9/20/20 6:24 p.m.

The bolt pattern is different on the intakes. You either need an adaptor or you need to weld an extension on the intake and redrill it. It's probably not worth the effort, especially when you'll be dealing with a different throttle body and iirc different tps wiring. 

Injectors are electrically compatible but the 99 ones are actually a bit smaller because an NB runs higher fuel pressure.. Iirc the 2001 are the right size. 

icaneat50eggs
icaneat50eggs Dork
9/20/20 6:49 p.m.

Have I mentioned how much I love this forum and being able to send a bat signal to Keith to come rescue me when I'm in over my head?

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