IM dyno comparo: VICS vs VTCS vs Flat-top (EUDM)
#21
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Here's an interesting article on intake manifold design. It would be cool to find out what a gutted VICS volume is.
http://amsperformance.com/pdfs/intakemani.pdf
http://amsperformance.com/pdfs/intakemani.pdf
#22
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Volumes of MSM and JDM mani here:
http://www.mazdaspeedy.com/2010/03/2...-vtcs-msm.html
Gutting the horizontal wall above butterflies in VICS mani has no effect on butterfly closed nor open positions, compared to stock.
http://www.mazdaspeedy.com/2010/03/2...-vtcs-msm.html
Gutting the horizontal wall above butterflies in VICS mani has no effect on butterfly closed nor open positions, compared to stock.
#25
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Reviving this not so old thread:
pretty sure I've seen someone post on here that the 99-00 and 01-05 IM's are completely interchangeable, but can't find that thread/post.
Can anyone confirm this?
Looking to fit a 99 VICS mani onto an 01, and want to make sure its 100% do-able without throwing any CEL's or having fitment issues.
pretty sure I've seen someone post on here that the 99-00 and 01-05 IM's are completely interchangeable, but can't find that thread/post.
Can anyone confirm this?
Looking to fit a 99 VICS mani onto an 01, and want to make sure its 100% do-able without throwing any CEL's or having fitment issues.
#26
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They are interchangeable, however if you're running the stock ECU you'll probably get a CEL & will likely have poor cold start drivability. Plus, you'll have to set up a way to run the VICS or it's pointless.
FYI if you're running a turbo check this thread at M.net out.
FYI if you're running a turbo check this thread at M.net out.
#27
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That basically confirms that vtcs mani sucks dongs and should be swapped out asap.
I'm planning on switching to a Honda mani in the future, but for now considering running the vics since I have a spare 99 mani laying around. So from what you're saying it wont simply "swap over" with a stock ecu?
I'm planning on switching to a Honda mani in the future, but for now considering running the vics since I have a spare 99 mani laying around. So from what you're saying it wont simply "swap over" with a stock ecu?
#28
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Ian, turbo engine at 10-15psi flows a lot more than a NA engine, how doesn't that matter?
On a side note how about cutting and enlarging the top of the vics intake manifold some more? One more thing, the stock runners on the vics manifold are good for 3-5k rpm, I'd assume cutting the primary runners some more to make them shorter over all would raise that range a bit?
Last edited by triple88a; 03-19-2012 at 04:36 PM.
#31
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That basically confirms that vtcs mani sucks dongs and should be swapped out asap.
I'm planning on switching to a Honda mani in the future, but for now considering running the vics since I have a spare 99 mani laying around. So from what you're saying it wont simply "swap over" with a stock ecu?
I'm planning on switching to a Honda mani in the future, but for now considering running the vics since I have a spare 99 mani laying around. So from what you're saying it wont simply "swap over" with a stock ecu?
Over the years I've learned that VICS works, use it.
#32
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Ian, turbo engine at 10-15psi flows a lot more than a NA engine, how doesn't that matter?
On a side note how about cutting and enlarging the top of the vics intake manifold some more? One more thing, the stock runners on the vics manifold are good for 3-5k rpm, I'd assume cutting the primary runners some more to make them shorter over all would raise that range a bit?
On a side note how about cutting and enlarging the top of the vics intake manifold some more? One more thing, the stock runners on the vics manifold are good for 3-5k rpm, I'd assume cutting the primary runners some more to make them shorter over all would raise that range a bit?
a) We know it makes zero difference N/A.
b) N/A is effected by VE changes where FI really isn't.
c) While gutting it may affect VE, it does not change the fact that your throttle body & your intake runner sizes are not changed a bit.
d) Therefore, I theorize that it won't make a bit of difference on a FI car except if you like adding mods to your mod sheet.
#33
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/\ I am of the same mindset, though have don't have much proof of this theory (but neither do like 99% of us discussing this). A bottleneck in the intake is more significant than a bottleneck in the ehxaust IMO, and I'm not sure simply enlarging the plenum while keeping stock tb and runners will do much (on top of what the VICS already does). But again, intake mani resonance, waves, etc etc all that isht is over my head....I just know the basics
#35
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lazy dumb idea:
extrude hone the 01 intake manifold.
leave the VTCS in place. yeah sure so what if they dont "fit" anymore, they are already designed to not seal when closed. Use them just to raise port velocity when off-boost.
extrude hone the 01 intake manifold.
leave the VTCS in place. yeah sure so what if they dont "fit" anymore, they are already designed to not seal when closed. Use them just to raise port velocity when off-boost.
#38
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uhhh yah.
uhhh also yah. and also I wasn't volunteering to pay for it. I heard good rumors of some aftermarket honda manifolds being decent performers.
BUT if you want to look all OEM (with a turbo, yeah I don't know how that works), it's the way to rock.
BUT if you want to look all OEM (with a turbo, yeah I don't know how that works), it's the way to rock.