SShep71

iTrader: (5)

I have a LY6 with a LS3 intake the VVT is intact and I will be running a 72mm turbonetics turbo. What cam is the better choice, the MAST VVT HO cam or the Comp XFI 267PHR14? I have read about both but I was hoping someone out there would have some real world info.

SShep71

iTrader: (5)

anyone? Does anyone have any feedback for the mast VVT HO with a turbo?

kanner1

I'm running the same exact motor without the turbo...I have the mast vvt ho cam and love it! Car sounds great and runs even better. No Dyno runs yet but it's making some crazy power for the street. Don't know how to shoot you my thread... Try searching 67 cutlass ly6 if you want to check it out. Good luck!

Jimbo1367

I wonder how well this will work. I am curious to see if the valve springs can live with boost AND vvt

SShep71

iTrader: (5)

I am going to be using aftermarket dual springs just to avoid future problems.

SweetS10V8

iTrader: (4)

Dual springs can cause the VVT to not operate exactly as commanded.

1989GTA

TSP sells dual valve springs with their VVT camshaft kits.

SweetS10V8

iTrader: (4)

Yup....

Jimbo1367

Dual springs not designed as a package then. LOL

SShep71

iTrader: (5)

I talked to the guys at mast at I was told that because Im using a turbo I should be using dual springs. I asked them about the compatibility between the dual springs and the VVT the guy said it was no problem and the springs they have with the kit will work just fine.

Che70velle

iTrader: (6)

This is an ongoing topic that will iron itself out in due time. I will be ordering my Mast camshaft hopefully this week, and it comes with springs, but I am unsure if they are duals. Should be, for the price. Yikes!

SShep71

iTrader: (5)

How much is the kit gonna run you? I priced the cam itself but never the whole kit.

SShep71

iTrader: (5)

SO I talked to 3 different manufacturers today and got 3 different answers.
Texas speed said no problem for VVT + Turbo and proper functioning with Double springs

Mast said some problems but no guarantees with VVT and a turbo only beehives

Fastlane said it could go either way but no double springs

Im gonna call comp cams tomorrow and see what they say, I wish I could get a def answer from someone that has experience. So far Mast has the best price (with military discount) across the board.

Che70velle

iTrader: (6)

Cam and springs....$899.00

futureuser

iTrader: (1)

Problems controlling vvt with dual valve spings and boost?

SShep71

iTrader: (5)

Thats what I figure is gonna be the problem. I talked to more people today and I was told that the springs will be to stiff for the VVt to function properly. Its not lookin good for the VVT at this point. I would rather peace of mind then an extra 1 or 2 MPG.

85MikeTPI

iTrader: (9)

VVT is not about MPG, it's about spreading the power curve.. If you're looking at VVT for just mpg, it's not worth it..

futureuser

iTrader: (1)

In the case of Gen IV v8s, it seems about MPG. Performance applications exclude vvt.

85MikeTPI

iTrader: (9)

I'm sure a lot of L99 Camaro5 owners would disagree..

This has been discussed before. Just because the General won't make a Manual trans VVT performance car, doesn't make VVT all about fuel economy.

futureuser

iTrader: (1)

Yes, and I'm sure any corvette owner would disagree. I think in the next generation it will be more about performance, especially if they use a cam in cam system like the viper.