I went ITB's, the Mazda manifolds are sitting on a shelf in my shop.

 

I've got some dyno time coming in the next month, Pinky, with my new Miata build. I also have a stock, unmodified 99 IM, and would not mind doing back to back pulls, and it will be built for 8500rpm, giving further data on the mod through a larger rev range.

Seriously. PM me if you want to try to get something worked out - I'd like to see this happen.

 

Here's what I did. I'm not limited by rpm control.

https://www.miataturbo.net/general-m...linkage-59754/

Before and after.


And then eliminated the hump.

 

...and? back to back pulls?

Not that I'm considering this. I just have been doing some searching about putting an MSM engine into a '99 and happened upon this thread. Seems like an interesting question.

 

I keep saying this: gutting makes no sense.


someone please just make it so the damn VICS makes a longer/shorter runner and test that.

 

Pinky should get Mani to Blaen99 for the A/B testing and complete this science project. Interesting thread resurrection.

 

Yes damnit. Please.

 

[QUOTE=turbofan;1112247]...and? back to back pulls?

I'd have to go back and look, but I made an extra 14 ponies by eliminating the hump.

For me, it made sense to try to increase the plenum volume under boost and still keep the longer runner length for velocity during non boosting driving.

 

You also gutted part of the IM, which likely negatively impacted you based on similar dynos, unless you have before and after plots.

PM'd Pinky myself. Let's get this test done Pinky.

 

No, I gutted a lot of the intake manifold. I don't see how increasing the plenum volume an a FI engine is a bad thing. When your not driving in boost wouldn't it be beneficial to try to keep something resembling stock runner length? I realize we are putting lipstick on a pig of a manifold/tb, but I don't think that going Honda is any better than what I've done. There is a mind numbing amount of information on plenum sizing/runner length for FI engines out there. I gave up for now cause I'm happy with how the manifold works. It was cheap. This year I'd kinda like to enjoy driving it instead of figuring out the manifold that will control the universe.


So why doesn't someone come up with a grant fund we can contribute to for this kinda stuff. Submit your proposal, that's based on time of completion, etc. just sayin........

 

gutted manifolds have already been proven not to do jack ****.

what no one has dynoed yet is using the VICS as a short/long runner rpm controlled manifold so you get the best of both worlds.

 

I've set up a deal with Pinky.

It's happening. Expect dynos within a month from today at the latest OR BAN*, you hear Brainy?

*: Assuming Pinky gets the IM to me in a reasonable amount of time.

 

I won't even ban

 

Bro, do you even admin?

 

Cool. I would like to help. I have this top that is already shaped and polished.
Let me know where to send it.

 

You know what?

If anyone else wants a particular IM tested in a back to back situation, PM me.

Sending you a PM now, 2many.

 

Hmmmm....I wonder if 18PSI shipped me his squaretop yet. That could be interesting to throw into the mix.

Either way, I won't be installing it anytime soon. Think we should add it?

 

yes I did. sent you tracking too

 

Sounds good to me.

It'll be interesting to get data on the squaretop up to 8500 as well.

 

I had virtual dyno runs with the manifold gutted. Showed a nasty hole between 5-6.5k rpm but it showed a nice bump just at redline few horses above the vics dyno. That said it does help however not in our stock 7k redline.

Jeff i know we talked about my idea of shortening the main runners and leaving the vics chamber in tact few weeks before the local dyno event. Did you ever mess around with that further or no?

Gotta get the hole on my manifold welded and give it a shot some day.