if only it was k20.....you would be making over twice the hp/tq with this setup

 

That intake cam gear was huge in my car. Totally changed the attitude of the engine, I don't have dyno to back this up.

 

If only it was an lsx it would make twice the power of a k20...

Problem is the whole swap is 5x the cost of this swap after all the details.

A usdm k20 with just itbs and a header wont make enough to be worth the work.

 

lol you missed his joke

 

That I did lol

 

It's not an LSx or some other exotic super motor, but I still like it. Maybe some cams and timing could improve it, can't wait to see boost on it!

 

I think it will be great once he eventually gives in to boost

 

So my itbs don't have any velocity stacks and I wasn't to worried about it until my neon buddy showed me this thread.

www.neons.org • View topic - Runner Length Tuning...ITB style

That is alot of cheap power and a huge amount under the curve that I'm leaving on the table.

I'll copy cat this test after I do the head work to settle on a proper size stack but damn am I ever excited to try it out and see what taking full advantage of the throttles can do

 

So ~10" was my personal favorite.
Also short runners = le suck unless you're doing nothing but drag racing.
Too long though and you start dropping off up top.

Wasn't it already kinda discussed here too though? I'm sure its in one of the manifold threads. Basically you want something like 9" or something like that iirc

 

that thread is full of win

 

It really is. Glad some guys take the time and effort (and money) to do stuff like that.

 

da longdur da runna da more dork down dol.

 

I can't remember what was ideal but after some head work, cams and bigger valves I'll do the same test with the pvc then order up some proper stacks which will also have gains over the straight cut pipes.

lol so much work for such little gains in the n/a world

 

You should just be one of the only people to ACTUALLY boost an irtb setup instead of just blow smoke about doing it lol

So far every single person to mention it has been completely and utterly full of poop.
(I know you didn't claim to do this, just saying lol)

 

After watching Emilio's Crusher I want 180whp like a ************

A turbo will **** up my classing, I'll have to jump up to play with the 300zx fiber body L28 racecars and crap like that :/

This setup keeps me with old E30 m-swaps, swapped civics and the like, things that don't blow my **** away.

 

I'm just breakin your ***** man, do what you want. Your swap is by no means bad or half assed.

Besides, someone with irtb's+boost just surfaced today (see ismael's thread)

 

Trust me, every day is a "to turbo or not to turbo" the miata

Thank chirst I still have a turbo street car to play with

 

Fixed from my point of view.

That's my dilemma. My mx6 is showing its age and I debate fixing it further or planting my fe3t inside a miata.

 

Cant wait to look at the vids of this when I get off my phone and onto a computer. Just wanted to mention that ITB's change the design of intake runners a little because you have the runner length pre-TB and post-TB. So you have 2 variables to play with.

I've looked into it a bit and it got awful confusing, awful fast. Maybe with a bit of experimenting you can shed some light on it for us.

 

I read up alot on the lengths from valve to throttle plate, then throttle plate to stack tip, then plate sizing for hp compairing it with head type, valve size ect ect ect... 4-stroke Performance Tuning is a good book btw

Then, I forgot everything I had read; cut my manifold where it lined up with the throttles I had and put them on the car and drove it.

Its a good motor for the miata, if you have the means its a very straight forward swap, biggest issue is the oilpan construction.