BossV8

I am thinking about a cam for my C5 LS1 which I use for track racing (no straight line). My car has: Z06 heads, intake and MAF, ARH headers, LS7 clutch and 3.90 stage two rear.

I would like to work with Vengeance so I am hesitating between VRX3 and VRX4.

Do you have any dyno graphs to share so I can compare curves : VX3 or VRX4 LS1 or LS6 heads?

Thanks.

miami993c297

iTrader: (6)

VRX3 Camshaft 226/228 .585/.588 114 LSA

Look like more road course oriented than

VRX4 Camshaft 228/230 .588/.592 112 LSA

more drag strip oriented...

Et non, je n'ai pas de resultat de banc...
Christian

thunderstruck507

iTrader: (18)

I doubt you see much difference in those 2 in the real world. 2* is not much at all and both are listed with the same RPM operating range. It seems it would mostly come down to which lobes are used but neither seems overly aggressive on lift.

BossV8

Merci Christian.

Got the graphs, from Vengeance. This is basically what they say : differences are minimal. VRX4 gets a little bit more power and a choppiest iddle.

Cars were stock except for cams.

miami993c297

iTrader: (6)

If the purpose of your car is road course...those two curves are different enough to have:

- Significant difference in behavior on throttle opening
- Significant power and torque difference
- One of those will ease the car on turn exit and uphill
- One of those might produce more speed by the end of the main straight (and that's not obvious at all as the exit turn speed is to consider)
- One of those will have a low impact on tire management
- One of those will have a significant impact on brake management.

Chacun voit midi a sa porte...
Christian

speedtigger

iTrader: (16)

I don't see 2 degrees of duration delivering 12 HP difference unless the ICL is different.

BossV8

What does ICL stand for?

Christian: what do you mean? VRX3 is better for track with twisties?

miami993c297

iTrader: (6)

Considering Dijon Prenoix, my bet is that a VRX3 type vs. a VRX4 type will make your car and lap time better especially in "Les "S" des sablieres", exiting "le gauche de la Bretelle", on throttle application of "La Parabolique", the whole "Virage de la Combe", and a so much better acceleration in "La Courbe de Pouas" going uphill to the start/finish line...

Nonetheless, I know gentlemen drivers racing their Z06 in SCCA events, and they are running different camshaft profiles than the one's you mention for the Road Course events...

A toi de voir!
Christian

BossV8

Thanks.

I am in the north. So I have Abeville, Croix, Metter, Clastres and ... SPA not too far away.

thunderstruck507

iTrader: (18)

Unless my eyes are playing tricks on me, the VRX4 looks like it makes more power and tq through nearly the whole curve. Seems that would be beneficial to me.

speedtigger

iTrader: (16)

Intake Centerline. Some might call this "advance".

BossV8

Ok I understand.

miami993c297

iTrader: (6)

It seems you have to learn about camshaft event a bit...

Plus those two cams are using XE-R lobes (by the specs), which I would never ever recommend to use on sustained revving 4 time a days during 30 minutes to 45 minutes session around a race track...

But again, chacun voit midi a sa porte.
Christian

BossV8

I have zero knowledge about this so I am ready to learn anything. What is the advice on camshaft when used for road course?

speedtigger

iTrader: (16)

Okay sparky........

miami993c297

iTrader: (6)

Hey tigger...seems you already got it!