.

 

Thanks noodle, but doesnt the vishnu stage 1 use stock cams? Does your 20 hp quote refer to stock cams or hks 264i/272e cams?

 

Stage 1 uses factory cams, so that graph should represent what gears can do with stock cams. I'd guess the gains would be close similar for Stage 1+ with the gears. Only guys that live behind the dyno have definitive answers. I just happened to recall that graph and dug it up just to get a general idea
Probably the same one you've seen aswell. I'm sure there's gotta be charts for just cams with and without gears out there...

 

Noodle,
What was your baseline before the stage 1 install with gears. I also have been on Shiv's dyno, it would give me a good idea of the difference beetween the stage 1 with exede vs. my Xflash.

 

Sorry, that chart's not mine. Brett posted that awhile back to show the difference cam gears can make.

 

1st quote: I doubt it IMO. Thats why I ask. The cams are completely different in lift, ramp rate, duration, grinder etc.

Factory cam installs ( any manufacturer) are generaly on the advanced side anyways for city driving, hence the -5 vishnu recomendation.

2nd quote: Thats why I have asked.

one could summize by the lack of response from this vendor, the actuall gains by the adj cam gears with hks 264i/272e cams are minimal when used with their exhaust & xflash components on 91 octane.

 

You may be right. I recall Shiv stating that retarding the cams -5 showed little to no appreciable gains. The -2, -3 setting seems small, perhaps to make up for belt slack, etc.... HKS seems to have properly degreed their cams to work sufficiently out of the box, however I do believe with 'tuning' there's some additional HP to be gained with gears on a Stage 1+. Maybe not as much as 20HP, but something.
Personally I'd be interested in seeing the exhaust cam left alone and perhaps retarding the intake cam a bit to see if there's any to be gained from a stock head, since retarding the exhaust cam along with the intake isn't giving up much.

 

Why no response from Vishnu & company regarding the Ps gains for stg1+ vs stg1+ minus cam gears on 91 octane?

 

Shiv and his crew I guess are always busy. Its hard to get immediate responses from them most of the time.

 

Adjusting cam timing on HKS has a significant effect on power output. You can essentially dial in whateve torque curve shape you want to a point. That is, you can give up some low end for some top end or visa versa. We found that retarding both cams 2 to 3 degrees helps power across the board. How much? In our car, we see as much as 10whp. Retarding more tends to sacrifice one area of the torque curve for another.

Cheers,
Shiv

 

OMG he responded!!!

Hey Shiv, the HKS EVO VII has their HKS 272 cams set to -2in/+1 ex. Have you ever tired this set-up? How did the guys with 272s fair w the ones with the 264/272 combo on your East Coast dyno day?

 

Thanks for the reply shiv.

 

Hey shiv I should prolly bring this up to you in a different manner but I am slightly concerened about long tern spring/retainer longevity of the stock pieces. Ive got 7K on cams with no problems but this week this little voice wont leave me alone Re: the issue can you comment?

 

Could you please post a power compare showing where the gain is seen?

I would like to know where this adj cam gear gain is seen, relative to revs with your xflash for your std dump back ( w/cat), hks 264I/272E on 91 octane vs stock cam gears.

I am not questioning the gain, I just want to know how useable the gain is for me in my application as a daily driver.

 

I might be way off base here, but I don't think you'll have to worry about the retainers at all. Are you revving the car to 8000rpm and beyond on the otherwise stock valvetrain?

As far as the springs, are you afraid the 272 cam will cause them to bind? Because I don't think there is any chance of the 264 cam doing that observing 7850rpm redline, but I might be off. I'd have faith in it, personally. I'm interested to hear Shiv's opinion on this. This will greatly effect whether I get cams or not.