pdexta

iTrader: (17)

I've seen a lot of talk about gutting the 99/00 intake manifolds and not all that much as far as testing/numbers. Figured I would post up my results, incase anyone is interested.

First off, it's a massive pain in the *** to gut this thing. I can't even imagine how many hours have gone into this thing and it's really not done, I just couldn't take it anymore. We gutted the top and bottom, and deleted the VICS butterflies. I dremmeled off the casting bumps the last inch or so before the head, but the runners are otherwise untouched (I just didn't have anything I could get to them with).

Weight comparisons, the stock manifold weighted 16.25lbs the gutted manifold weighed 12.96lbs. So we removed a little over 3.25 pounds of aluminum from the thing.

Both:


Gutted:


Stock:


I took 3 datalogs of each, all 3rd gear pulls, all in similar conditions on the same day and loaded them in virtual dyno. These were the most representative runs of the 3 pulls with each setup. Stock manifold with VICS working (red) vs Gutted Manifold (blue)



Overall, I'm really happy with the top end gains and very little loss on the low end. It's a great $/hp if you've got the time and means to do it yourself, but if you factor in the labor it's pretty horrible.

hustler

iTrader: (6)

I had John polish mine but I kept the long runners. I have no data. Thanks for doing this.

aaronc7

iTrader: (8)

thanks for doing this. not a bad gain, just time consuming it would seem

fwMiata

01-05 the same?

thirdgen

iTrader: (26)

I gutted mine as seen here at the end of the thread...
https://www.miataturbo.net/engine-pe...-intake-64204/
but I am running a small turbo and have no data on numbers.
Thanks for this.
I am also running the VICS, I only gutted the upper plenum.

18psi

iTrader: (76)

Thank you for posting pics and results. So you traded some torque for some power. Not bad considering you gained significantly more power.

And no, the 01-05 is not the same.

Laur3ns

On the stock run, did VICS operate as normal?
Also, did you retune fuel and spark for each to maximize performance with each?

Faeflora

iTrader: (2)

I have power building to 8000RPM with my gutted intake. Proven with my gt3071.

18psi

iTrader: (76)

Sorry sweetie, you didn't prove jack isht. Before/after with as many variables identical is what people give a crap about, not you saying "well I didn't lose power so it must be working"......herp derp

soviet

iTrader: (10)

Wouldn't gutting a 2001-2005 manifold yield virtually the same results?

I have one laying around that I wouldn't mind butchering - seeing how they aren't as valuable as 99/00 VICS intakes.

edit: https://www.miataturbo.net/engine-pe...anifold-40844/
tl;dr **** that noise

18psi

iTrader: (76)

Yeah no.

I has a spare 01 too that I'll be fuxorzing together with a hawnduhh one and hopefully gain good topendz...way later though

soviet

iTrader: (10)

I just feel like all work on stock manifolds is a giant circlejerk and would be way better off to just get a custom manifold made.

Faeflora

iTrader: (2)

Eat my *** vlad. Stock intake power takes a crap above 7000ish. Mine didnt an i had no boost creep. This was at 20psi on 3071.

18psi

iTrader: (76)

I don't have to baby.
Do you has dyno of your stocker taking a crap above 7k?
No?
Then stop being a fcking ratard.

Its not that I don't believe you or want to troll you, I promise you.
Its about me wanting to see actual results and you provide mind numbing retardation. Sorry bby I still <3 u doe

+2

I mean its probably good for something. Just not much, and def not worth the trouble imo.

If more people (like OP) keep testing this stuff and we have more data and I'm proven wrong, I'll gladly bust out my Fae autographed sawzall and go to work on my spare IM

Faeflora

iTrader: (2)

Search vlad you are trolling me. you know exactly what i am talking about. and who cares if it is back to back because unless you have boost creep your power will take a shiit with a stock manifold. over 8k

Anyways this is the ultimate intake ------s

18psi

iTrader: (76)

Lmao...Show me dyno plots to prove it

Der_Idiot

iTrader: (2)

What turbo and how much boost were you pushing? A gain like that is worth my investing in a second IM if I can find one very cheap/free. I've got a lot of free time in the winter

nismo502

iTrader: (2)

that's 25bhp lost at 4000rpm where you use everytime you drive.
Useful gain is after 5500rpm which you use less.
Unless it is a trackcar, would that be useful?

pdexta

iTrader: (17)

GT2871 .64ar @ 19psi

Personally I don't drive around at WOT all day at 4000rpms. If I'm wanting the car to go fast, I pass 4000rpms one time, in 1st gear. After that I tend to stay toward the right side of the tachometer.

Faeflora

iTrader: (2)

You are a raging *****.