Vacuum with HKS 264/272

[espinelli]

Hey guys just wondering what your vacuum readings are please post your results and CAM info. Be sure to specify CAM Type (Stock, HKS, Crower), CAM Profile/Size (272, 264) and if they are degreed.

I'm pretty that everyone knows a car with stock cams pulls ~18inHG give or take of vacuum just wondering what kind of vacuum readings the modded guys are seeing.

 

[Staytuned]

HKS 272's not degreed and as steady as I can keep the idle around 900 I see 13 -14 inHg.

 

[pboglio]

HKS 264/264, non-degreed. 18-20" HG vacuum even with an HKS VPC at 1000 rpm idle.

 

[Awdboost]

272/272 HKS.. on the AEM EMS with AEM sensor -5.8 to -6.8 psi (not in HG) at 850 rpm Not bad.. I wouldn't advice getting 272/272 unless you are going with a 20G or bigger.

 

[16g-95gsx]

I'm on around 16.8 or so inHG at 850rpms according to DSMlink and my 3bar GM MAP sensor. I run FP2's

 

[Turbo Talon DL]

Are you guys serious? I never get that much vacuum at idle I only get at the most 7in/hg @ 800-900rpm with 264/272 undegreed. If I use adjustable cam gears and retard the intake cam a few degrees, would that help me pull more vacuum? I serched like crazy for boost leaks and cant find anything that would kill my vacuum like that. Im running a cyclone intake manifold right now too, and it isnt set up proplerly yet. Gotta find a white canister still

 

[notractiongst]

Are you guys serious? I never get that much vacuum at idle I only get at the most 7in/hg @ 800-900rpm with 264/272 undegreed. If I use adjustable cam gears and retard the intake cam a few degrees, would that help me pull more vacuum? I serched like crazy for boost leaks and cant find anything that would kill my vacuum like that. Im running a cyclone intake manifold right now too, and it isnt set up proplerly yet. Gotta find a white canister still

Same here bro i have 272s undegreed and ionly get 8-10 in hg thats about at 750-850 RPM i searched to no end for vac and boost leaks but can never find any

 

[espinelli]

Appreciate the replies. I fired mine up over the weekend and below is what I'm getting...

Vacuum @ 950 is 50KPA ~ 14inHG
Fuel Pressure ~ 39psi with hose on / 43.5 with hose off. Shouldn't my fuel pressure be lower than 39psi w/ hose on? I think I might have to upgrade my return line..... Using an Aeromotive AFPR and Walbro 255HP pump

I have HKS 264/272 w/ adjustable cam gears. If I retard my exhaust cam will that make more Vacuum or is 14inHG acceptable with 264/272 cams?

 

[Turbo Talon DL]

Appreciate the replies. I fired mine up over the weekend and below is what I'm getting...

Vacuum @ 950 is 50KPA ~ 14inHG
Fuel Pressure ~ 39psi with hose on / 43.5 with hose off. Shouldn't my fuel pressure be lower than 39psi w/ hose on? I think I might have to upgrade my return line..... Using an Aeromotive AFPR and Walbro 255HP pump

I have HKS 264/272 w/ adjustable cam gears. If I retard my exhaust cam will that make more Vacuum or is 14inHG acceptable with 264/272 cams?

How'd you get 14in/hg with hks 264/272? I cant even get CLOSE to 14... I've looked for vacuum leaks and havent found any. I ran my boost tester from the UICP back. No leaks but still no vacuum... Lemme know what you have. My cams are both off by about 1-2*. (my timing lines up 8* BTDC) i dont have adjustables so that means my cams are both advanced further than they should be. HELP..i want all this stuff figured out before i get my engine back

 

[espinelli]

My mods are in my profile. Basically, I just made sure everything was tight and checked for boost leaks. However, I'm going to look into this again over the weekend.

I'm getting 14inHG but I still think that's low given the results some of the other guys have posted. I do have adjustable cam gears which I had to degree so I can zero things out. IE: If you were to look at my exhaust cam gear it reads 4* advance but its actually 0.

I think I'm going to recheck my timing and boost leaks this weekend. I'm stumped why I'm only seeing 14inHG. I'm convinced its my cam gear.

Any others running cams? Please post up your results.

 

[dsmchips]

Im running a cyclone intake manifold right now too, and it isnt set up proplerly yet. Gotta find a white canister still

Try Mitsu part # MD125817. I think thats the number someone put on a website where we were discussing Cyclone control in my chip. Its from an Eclipse V-6 or Montero 3.5 with the variable-induction engine.
I'm running Dodge part # 4677204 on my one GVR-4 with Cyclone, if you have easier access to Chrysler products.
FWIW, I was only getting about 15 in/Hg with my 264/264's, but now with the Cyclone its up to 17.

 

[TSIfreek]

I have 19 inches of vacume at 800 rpm with my comp 100 cams on my new motor and love them. Great street cams.

 

[Generation X]

I get anywhere from 12 to 16inHG with my non degreed HKS 264/272 cams, and that's at 850 to 900 rpm. I'm also at about 2800ft in elevation.

 

[NeoStreamGSX]

10-12in HG w/ hks 264/272 cams w/ idle at 750...no vacuum or boost leaks either...

 

[paul s]

I get around 14hg with 272/272..800rpm idle.

 

[Turbo Talon DL]

Try Mitsu part # MD125817. I think thats the number someone put on a website where we were discussing Cyclone control in my chip. Its from an Eclipse V-6 or Montero 3.5 with the variable-induction engine.
I'm running Dodge part # 4677204 on my one GVR-4 with Cyclone, if you have easier access to Chrysler products.
FWIW, I was only getting about 15 in/Hg with my 264/264's, but now with the Cyclone its up to 17.

My diaphragm on the butterflies is leaking anyhow. I may just trade in both my cyclone intake and my old stocker for a nice extrude honed stock piece. From the dyno sheets i've seen the stock manifold will do me the best with its power peaking in the mid R's.

 

[92awddsm]

I have comp 200's and get about 15-16inhg at 950 rpm idle. Not degreed.

 

[koachworks]

264/272 combo from FFWD, installed straight up. 1000 rpm. 18hg.

 

[andymoraitis]

Comp 200's with the intake cam advanced 5 degrees and the exhaust cam installed straight up. I see 9 in/hg at 1000 RPM and lope like a big V8 with indigestion.If it drops to 900, I see 7 in/hg. Prior to the intake cam change, I was getting 15-16 in/hg at 750 RPM (those things were way off).

 

[olmytsi]

Hks 272s, stock gears, 900 rpms, 12 in Hg.

 

[csgsx23]

Stock regrind cams, stock gears, fresh motor, 14-16 in Hg at 900rpms

 

[BISHILVR]

Stock cams @ 800 rpm 18-20 in

 

[kraka]

My friend gets -6 --> -7in of vacuum at his 700rpm idle on straight 272's.....He doesnt really mind, but its not much for the sleeper effect, as with a vacuum that low, you can hear him camming from a 1/4 mile away

 

[blackGSX2g]

264/272 cams not degreed: 750-800idle it lopes anywhere between 10-13in/hg and sounds BA. If I add a bit more fuel and bump up idle to 900ish I can hold 15-16in/hg at a perfectly smooth idle, but whats the fun in that!

 

[andymoraitis]

264/272 cams not degreed: 750-800idle it lopes anywhere between 10-13in/hg and sounds BA. If I add a bit more fuel and bump up idle to 900ish I can hold 15-16in/hg at a perfectly smooth idle, but whats the fun in that!

Abolutely none! Sometimes I drop a pound of fuel pressure just to make it sound like a solid lifer big block at idle.