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Old 03-31-2012, 07:49 PM   #1
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Default VTCS Removal on 2001 Miata Engine

After reading a number of archive discussions and studying the shop manual I've decided to remove the VTCS hardware from my '01 engine inlet plenum. I'm using the engine in my Locost (Lotus replica). I plan to remove the control valve for the VTCS butterflies and also the butterflies themselves plus the control shaft attaching all four butterflies together. I plan to seal the inlet hole for the shaft, but was wondering if it is really necessary to seal the shaft holes located between the four inlets? I guess to be complete they should be sealed to provide separation for all four inlets. Am I right or is it really not necessary.

Anyone else have experience removing this Variable Tumble Control System?

Thanks in advance,
Roy
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Old 04-01-2012, 12:02 AM   #2
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we recently had a thread about this, and my conclusion in the end after talking to many different people is that this nets nearly no gains and is basically a waste of time
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Old 04-01-2012, 02:50 AM   #3
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Default VTCS or VICS?

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Originally Posted by 18psi View Post
we recently had a thread about this, and my conclusion in the end after talking to many different people is that this nets nearly no gains and is basically a waste of time
I saw your discussion about what I thought was the 1999 - 2000 VICS. What I'm referring to is the series of butterflies at the entrance to the lower plenum ports known as the VTCS for the 2001 to 2005 engines.

Am I wrong but we're talking about two separate functions?

See post number 11 and 21 of the attached.
http://forum.miata.net/vb/showthread...highlight=vtcs

Cheers,
Roy

Last edited by RoyzMG; 04-01-2012 at 03:02 AM.
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Old 04-01-2012, 02:52 AM   #4
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In that thread I was referring more to the vics, but I was researching both.
In the end that was my conclusion, and my stock 01 mani is staying that way til it comes out for a honda unit. Just my .02 though, not saying its fact.

If you do gut it though, please try to get some cold hard data for us. So far 99% of the "gains" people claimed are inconclusive.
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Old 04-01-2012, 03:03 AM   #5
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Quote:
Originally Posted by 18psi View Post
In that thread I was referring more to the vics, but I was researching both.
In the end that was my conclusion, and my stock 01 mani is staying that way til it comes out for a honda unit. Just my .02 though, not saying its fact.

If you do gut it though, please try to get some cold hard data for us. So far 99% of the "gains" people claimed are inconclusive.
See #11 and #21 of the attached.
http://forum.miata.net/vb/showthread...highlight=vtcs

Cheers,
Roy
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Old 04-01-2012, 03:08 AM   #6
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I understand exactly how each works lol
I'm questioning the power gains to be had by removing a butterfly valve in full open position.

I doubt you'd gain more than 1-2hp, if that. Which means its pointless.
The very few dyno plots I've seen showing intact vtcs vs gutted showed no gains, and one showed a loss in power. Besides, 2hp can easily be attributed to variance between dyno pulls which makes it completely useless.

I'm more than open to being proven wrong though. I just recently started looking into this whole topic.
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Old 04-01-2012, 03:11 AM   #7
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Quote:
Originally Posted by 18psi View Post
I understand exactly how each works lol
I'm questioning the power gains to be had by removing a butterfly valve in full open position.

I doubt you'd gain more than 1-2hp, if that. Which means its pointless.
The very few dyno plots I've seen showing intact vtcs vs gutted showed no gains, and one showed a loss in power. Besides, 2hp can easily be attributed to variance between dyno pulls which makes it completely useless.

I'm more than open to being proven wrong though. I just recently started looking into this whole topic.
thanks - I understand now where you're coming from.

Roy
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