Anyone with the HKS 272 cams? Have a question...
 

Alright, I currently have the new Tial Q BOV and have the 10 psi spring in it which is good for -16 to -19 vacuum. I am now going with the HKS 272 cams and was wondering if anyone knows what kind of vacuum they read so I know what spring to buy for the BOV. Here's the BOV spring rates:

-8 to -11 in/HG use 6 PSI Spring (Black)
-12 to -15 in/HG use 8 PSI Spring (White)
-16 to -19 in/HG use 10 PSI Spring (Silver)
-20 to -21 in/HG use 11 PSI Spring (Purple)

I am thinking I am going to have to go with the white spring, but wanted to make sure. So anyone with the HKS 272 cams, what kind of vacuum to you read? Thanks!

Re: Anyone with the HKS 272 cams? Have a question...
 

Usually around 12inhg lowest to 17ingh highest. I usually sit around 13-14 with mine.

Re: Anyone with the HKS 272 cams? Have a question...
 

Prolly the white (8psi spring), just from what I've seen.

Re: Anyone with the HKS 272 cams? Have a question...
 

When I start it cold, I see about 15, and at idle, I see about 11-12. However on decel, I see as much as 24.

Re: Anyone with the HKS 272 cams? Have a question...
 

Well I bought the silver spring today. I should be ok then with vac conditions now?

Kevin, you say you see -24 sometimes, should I have just left the spring alone or would you have recommended me change to the smaller spring?

Re: Anyone with the HKS 272 cams? Have a question...
 

I thought it should always be around -24 on deceleration, no matter what the cams. On stock cams I saw a lot of vacuum at idle, and -24 on decel, now with bigger cams I see only -12 at idle and still -24 on decel.

Re: Anyone with the HKS 272 cams? Have a question...
 

So would putting the smaller spring on there hurt it at all if -24 is the norm? I thought you bought the springs based on what the idle vac was.

Re: Anyone with the HKS 272 cams? Have a question...
 

I run a 11psi spring in mine craig used a 11psi spring with his 280's

Re: Anyone with the HKS 272 cams? Have a question...
 

I have the 11 psi spring in my Tial, and I don't have any problems with it.

Re: Anyone with the HKS 272 cams? Have a question...
 

Hmm, wish I would have known this before ordering the $30 spring haha. Oh well, I'll try both ways and see if there is any difference.