Normally aspirated strange power curve issues - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 04-09-2013, 10:02 AM   #21
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Square top will give you 7-10hp.
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Old 04-09-2013, 10:15 AM   #22
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yeah the VCTS manifold is the worst of them all. Are you actually running VICS now or just the IM?


Hustler, so far as I've seen, a funcitoning VICS IM will net same exact powercurve as a squaretop.
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Old 04-09-2013, 10:24 AM   #23
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Quote:
Originally Posted by Braineack View Post
yeah the VCTS manifold is the worst of them all. Are you actually running VICS now or just the IM?


Hustler, so far as I've seen, a funcitoning VICS IM will net same exact powercurve as a squaretop.
No way, we gained significant high end power and lost a tad in the mid range when we replaced the vics with a flat top on the csp car. I dont have dyno numbers to back it up I just have the boat load of VE I needed to add up top and the bit I had to take away in the mid range to back it up.
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Old 04-09-2013, 10:36 AM   #24
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Here's the one I was thinking of:



Quote:
Run 30 [is] w/the stock VICS IM w/ VICS set at 5400 RPM, which tends to be corret for most FM2 cars. Run 33 has the flat top manifold installed.
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Old 04-09-2013, 10:39 AM   #25
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Quote:
Originally Posted by Braineack View Post
yeah the VCTS manifold is the worst of them all. Are you actually running VICS now or just the IM?


Hustler, so far as I've seen, a funcitoning VICS IM will net same exact powercurve as a squaretop.
Negative. I made a touch less torque and 10hp more (on the MD-240) from 4500-7100 with my square top compared to my daily. Same engine, same header, same exhaust, same intake pipe, the daily has a 99 plenum, green car as a square.
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Old 04-09-2013, 10:45 AM   #26
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This thread is really starting to be cool.

Thanks for sharing OP.

This is yet another plot showing what we all suspected/knew: vtcs mani past 6k is DONE son
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Old 04-09-2013, 11:23 AM   #27
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Quote:
Originally Posted by 18psi View Post
This thread is really starting to be cool.

Thanks for sharing OP.

This is yet another plot showing what we all suspected/knew: vtcs mani past 6k is DONE son
+1 for "sonning".
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Old 04-09-2013, 11:40 AM   #28
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I am operating the VICS @ 5,400.

I will be removing the VCTS and doing some light porting (i.e. gasket matching, work behind the throttle body, etc) and retesting. I would love to gain back the lost HP and TQ and keep most/all of the high RPM power.

A question for you guys, do you think that a 2.25" Bosal made, Mazdaspeed brand Spec Miata exhaust, with a Jackson Racing 1.6L high-flow cat is too small to support more than 140HP?
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Old 04-09-2013, 11:45 AM   #29
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Just throw the VTCS IM away and dont look back.
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Old 04-09-2013, 12:32 PM   #30
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BTW the VICS vs VTCS vs Squaretop data from FM vs TSE don't jive very well.
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Old 04-09-2013, 12:35 PM   #31
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I wasn't aware there was data from TSE from testing them: care to share?
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Old 04-09-2013, 12:42 PM   #32
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k, good to know.

similar to the FM vs. TSE EFR results I'm going to assume

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Old 04-09-2013, 12:48 PM   #33
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well obviously 2560>EFR especially on a 1.6 in Australia
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Old 04-09-2013, 01:22 PM   #34
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I have a suspicion that the square top doesn't have as much effect on a turbo car as an N/A car.
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Old 04-09-2013, 01:27 PM   #35
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Aussie correction values differ from SAE.
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Old 04-09-2013, 01:28 PM   #36
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Quote:
Originally Posted by karter74 View Post
I have a suspicion that the square top doesn't have as much effect on a turbo car as an N/A car.
Oh boy here we go
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Old 04-09-2013, 01:29 PM   #37
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Quote:
Originally Posted by karter74 View Post
I have a suspicion that the square top doesn't have as much effect on a turbo car as an N/A car.
It should be a function of revlimit, not turbo vs NA.
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Old 04-09-2013, 01:30 PM   #38
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Brand new VTCS vs VICS data:
VICS manifold vs VCTS (W/Butterflies) - MX-5 Miata Forum

The difference above 6800 RPM actually matches FM's stock 99 vs stock 01 dyno plot
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Old 04-09-2013, 01:33 PM   #39
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Quote:
Originally Posted by Leafy View Post
No way, we gained significant high end power and lost a tad in the mid range when we replaced the vics with a flat top on the csp car. I dont have dyno numbers to back it up I just have the boat load of VE I needed to add up top and the bit I had to take away in the mid range to back it up.
MX-5 Miata Forum - View Single Post - FM High Compression VVT Stroker Hydra

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Old 04-09-2013, 01:38 PM   #40
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Quote:
Originally Posted by JasonC SBB View Post
Brand new VTCS vs VICS data:
VICS manifold vs VCTS (W/Butterflies) - MX-5 Miata Forum

The difference above 6800 RPM actually matches FM's stock 99 vs stock 01 dyno plot
He just posted that in this very thread today lol
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