No the Miata's firing order is 1,3,4,2

Think about how a firing order of 1423 would work with relation to the crankshaft, it'd be horribly unbalanced.

My bad, yeah I was thinking about the crank...

Fastest moving thread ever?

Despite everything Ive typed here I do hope he does it just so we can all be that much wiser about it.

Dann

Sav, you seem to fully understand Bernoulli's principle, but what do you think the choke is on an adjustable itb?........It is an airfoil. One that you can adjust to any shape and diameter with little expense. Try that on a stock log manifold.

Probably not the fastest thread ever. There have been some movers on this site.

I fully enjoyed the debate however. Thank you for your good participation in it. Thank you Sav as well.

I hope the OP is not completely put off by what some have said about building a stout naturally aspirated motor. I have had a lot of satisfaction with my N/A. It can be very rewarding even if it is not the fastest car in the bunch, and the fact that it can be expensive. Just a totally different experience.

I'm not thrown off by anything stated in this thread, I'm just glad there are the amount of members on this site who have good educated responses. Will I say "forget the ITB idea?" Not sure yet. Maybe someday I'll do it, but right now my turbo setup has been on the car for years, and I'm sure it'll be there a few more.
What I really need is another Miata, one with turbo and the other with ITB's. Before that though, I need a bigger garage, I need to finish my Willys project, I need to finish my Triumph project, and then some.
My car also has 150,000 miles on it, and it should get new rings and have the head gone over. If I pull it to do all that, then I might go high comp pistons and part out the turbo setup, but that's deep into the unset future.

If you want to try ITB's don't forget it, I say try it out.

However, you just listed literally 4 or 5 projects that you are doing or want to finish, lol. I'd get those done first, then find a nice 90-93 chassis (lightest) and do a ITB's on high compressed VVT motor. That should make for a nice car.

Good luck.

Straight out of A. Graham Bells 'Four stroke performance tuning':
(Page 28)
Throttle Plate requirements,

Size Maximum N/A Horsepower ATW
50mm 170
56 210
62 260
70 330

etc etc

How big is a stock TB plate?

Dann

"cheap" and "satisfying" can not be added together in the same scentence when discussing turbos.
:2cents:


oops thought i was reading a more recent discussion lmfao

IRTB's are neat but I always just saw them as the last thing you should do to an engine due to the cost vs performance. When I say last I mean grab all of the low hanging fruit first. I think a built, full bolt on VVT would be way more fun than a stock motor on IRTB's.