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Vtec/Turbo interaction

 
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Old 09-07-2008, 08:35 PM
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Vtec/Turbo interaction

From another forum, about turbo vtec (think it is accurate? I thought is seemed a little suspect seeing as I know vtec engines have been boosted time and time again.). I am not boosted but may consider running around 8psi in the future (probably won't happen). Lilbluelude is supposed to explain why this is misinformed.

"In a low pressure turbo system, the VTEC cam profiles are used to maintain the same torque curve shape as a N/A VTEC engine, only difference is the torque curve is higher. In a high pressure turbo system, the VTEC system is disabled because the high lift cam at high rpms do not work well with high boost. What happens is the valves are still open during compression stroke, so the boosted mixture escapes before the valves close, therefore robbing you of power at high rpms. Since the low rpm cam profile doesn't exhibit this behavior, VTEC is disabled to use the low rpm profile across the entire powerband. Of course, the proper scenario would be a custom ground cam for low rpm and high rpm turbo operation, with the VTEC system intact, to maximize power across the entire power band."

anyone interested in explaining the interaction between vtec and boost?

this site seems informative in regards to turbo: http://www.torquecars.com/tuning/adding-turbo.php

Last edited by mr_y82; 09-07-2008 at 10:23 PM.
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Old 09-07-2008, 08:45 PM
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Re: Vtec/Turbo interaction

if you are having issues like that then i would have to say you need new valves and valve springs. that solves floating valves. which is what this guy is talking about.

that article is not the link that you posted btw
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Old 09-08-2008, 07:48 AM
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Re: Vtec/Turbo interaction

^thanks,

I thought I had responded to this last night, but maybe I closed the window without adding it... I edited my OP... I'm not boosted, just looking for info for curiosities sake and in case I boost someday. The link to the site was just a random find with some good basic info on turbos.
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Old 11-14-2008, 09:43 PM
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Re: Vtec/Turbo interaction

lilbluelude stood me up here... told me to start this thread and then ditched me.
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Old 02-03-2010, 10:48 AM
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Re: Vtec/Turbo interaction

No luck, eh?
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