Normally aspirated strange power curve issues
04-09-2013, 09:15 AM
#22
Boost Czar
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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.
Hustler, so far as I've seen, a funcitoning VICS IM will net same exact powercurve as a squaretop.
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04-09-2013, 09:24 AM
#23
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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04-09-2013, 09:36 AM
#24
Boost Czar
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Here's the one I was thinking of:
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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04-09-2013, 09:39 AM
#25
Tour de Franzia
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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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04-09-2013, 10:40 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?
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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04-09-2013, 12:30 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
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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04-09-2013, 12:33 PM
#39
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Join Date: Jul 2005
Posts: 6,420
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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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04-09-2013, 12:38 PM
#40
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
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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