JUN High Lift Exhaust Camshafts has be released

The Dimer

I'm just curious how the VVEL reacts to a different exhaust cam. Would it just stay the same or would the computer adjust to "match" the new cam?

XwChriswX

VVEL would just laugh at you and say: "Silly modder, all your timings are belong to us."

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The Dimer

zuperman 370

will an uprev tune be enough, can uprev be used to tune these cams? and will i need to change other internals to accomidate the cams, how agressive are those cams?

Alfamale

you need a tune that can accomodate the change in lift/durations

zuperman 370

Does uprev have the tune option to change lift/duration?

Red__Zed

To those asking about install difficulty, expect 10-12 hours as a competent mechanic.


To those asking about VVEL, this is an exhaust cam.

Red__Zed

That's the question of the hour.

If phunk's theory is right, there is cl feedback and the answer is yes, at least to some degree...though how effective the system will be at compensating remains to be seen.

If not, who knows how it will behave.

BigT

JUN said themselves, and this is common knowledge, the larger duration cam lowers static compression hence why they put in high comp pistons. What i'm wondering is, how will the motor react power wise with just the cam swap and stock pistons.

To be honest with you guys, for a measly 10~15whp, its not worth ripping apart the motor to swap cams and then retune. The price per hp ratio kinda sucks. If, I was rebuilding a block and had it apart already, then maybe I would swap the cam in.

O&G

Installing these cams will require you to remove the entire timing chain cover and a slew of other stuff. Probably better to do this mod if your already building the motor. The lowered compression could go well w/ FI. I mite look into using these when I build my motor but I'll wait for more info before pulling the trigger.

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red6spd

Probably looking at a good $1000 just to install. But if it makes a big difference I would be willing to fork over the money.

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ANMVQ

Hmm interesting on a FI car, NO?

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The Dimer

Very interesting. In theory, if these lower the compression ratio then one could run more boost and make more power without needing to build the block, no? Or is it more of a certain level of power make the engine go boom kinda thing?

Then again, as stated before, if you're ripping apart the top of the motor you might as well build the whole thing.

BigT

Static compression is lowered yes, but the added compression from burning the air/fuel mixture(timing advance) is actually greater, hence why adding larger cams makes power.... usually.

christian370z

This is very interesting, it'll be cool to see what kind of gains and drivability changes these cams could yield.

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