Jump to content
SAU Community

Recommended Posts

Hi Guys,

Im having some real trouble with my car at the moment, its a 1993 RB25DET. Have recent rebuilt the motor with forgies, new rods, new plenum, bigger zuast and new cams etc etc... but its making less power than before, 268rwkw droped to around 230rwkw it should be making over 300 :)

My tuner has pretty much put it down to that the cams havent been dailed in right, I wont say who put em in :(:D but what I need is the dail in sheets you get with the cams as I seem to have misplaced them.

I contacted the recommeded HKS dealer in Aus but werent very helpful and pretty much said seeing you didnt buy em through us "stiff shit" so...

The cams are HKS items 256deg\inlet 8.8 lift and 264deg\exhaust 9.0 lift.

So if ANYBODY has them or can help me could you contact me or send them through to me, all my details are below

Mob No: 0407944561

Fax: 03 63310277

Email: [email protected]

or just PM me

If anyone can help me please do as im really stuck at the moment.

Cheers,

Luke

Link to comment
https://www.sau.com.au/forums/topic/98348-cam-problems-urgent-help-needed/
Share on other sites

have you got a picture of them with the cam gear covers off?

do they hgave ADJ cam gears with them or just using the standard ones?

have you set the bottom end to top dead centre and checked the markings on the backing plate of the cam gear covers?

have you got a picture of them with the cam gear covers off?

do they hgave ADJ cam gears with them or just using the standard ones?

have you set the bottom end to top dead centre and checked the markings on the backing plate of the cam gear covers?

Ive got an adj exh gear which is set to 0 and yep it was setup with it at TDC and all markings on backplate, gears and belt all lined up perfect but turner seem to think that with aftermarket cams they still need to be dialed in as they can be out even with this all perfect.

Ive got an adj exh gear which is set to 0 and yep it was setup with it at TDC and all markings on backplate, gears and belt all lined up perfect but turner seem to think that with aftermarket cams they still need to be dialed in as they can be out even with this all perfect.

Nope they don't, HKS cams are dialed in perfectly at the the standard markings. It doesn't matter anyway, you are going to tune the camshaft timing on the dyno using the adjustable camshaft pulleys. So setting them up perfectly first is a complete waste of time. The most common setting is 4 degrees retarde on the exhaust and 2 degrees advanced on the inlet. But every car is different.

:P cheers :D

hi sk

what advantages does this give as a rule of thumb

as each different set of cams would require different config to get the most yes?

and by most - who wants top end who wants down low?

so what would 4 degrees retarde on the exhaust and 2 degrees advanced do?

i presume more midrange?

Sydneykid is right Luke, Your going to adjust your Exh cam using your Adjustable Cam Gear. I have the HKS Instruction sheets at home here but from memory there is only a Dial In Sheet with the HKS Exhaust Cam. If you really need the Instructions I can Scan and Email to you if you want.

Ken

Sydneykid is right Luke, Your going to adjust your Exh cam using your Adjustable Cam Gear. I have the HKS Instruction sheets at home here but from memory there is only a Dial In Sheet with the HKS Exhaust Cam. If you really need the Instructions I can Scan and Email to you if you want.

Ken

If you could Ken that would be great, it would make my tuner happy anyway, my email address is the earlier post ;)

What he wants to know is;

What lift it should have at TDC

Crank Deg at 50thou lift

Open - Closing timing

because at the moment on both in/exh cams there is only 25thou lift at TDC an on the inlet side there is only 50thou lift 7.5deg ATDC, which he said is very out and should be more like 60-70thou lift at TDC(I think :D )

He said he just wants some were to start from.

The car make really good power till about 3500rpm and just not much after that.

This is all a bit over my head so sorry if i seem a bit vague, im still tryin to learn bout all this :D

SK - My turner said they seem to be too close and one needs to be advanced and the other retarded so ur 2deg advance on inlet and 4deg retard on exhaust sounds about right.

:) Cheers guys :D

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • My thought is if you were just moving it forward and the upstream geometry remained the same, then no difference at all. But because the current one has the filter direct into the AFM inlet, you effectively have the best chance of a completely symmetric air flow profile upstream, and in, the AFM, whilst the aftermarket inlet thingo has a (small, to be sure) bend between the filter and the AFM. That would bias the flow to the outside of the bend (downstream of the bend) which might well reduce the size of the signal seen by the AFM, for the same total flow rate. Having said that: If you're proposing to make your inlet look like a hybrid of your existing one and the aftermarket one, such that there is no bend where the filter is clamped on... then I say it will be just fine. If there is going to be such a bend, then, if you can align the insertion of the AFM blade such that it is at right angles to the plane of the bend, then there is a better than even chance that the centreline velocity where the blade is will remain more or less the same, and the velocity will just be a little faster to the outside of that, and just a little slower to the inside. **This is not professional investment advice and you should consult a suitably qualified ouija board, tea leaves or the intestines of a goat for more accurate prognostication.
    • Hi Tao, Thanks for your reply.  It's been a while and I managed to get the valve stem seals replaced with the head on the car.  Unfortunately this didn't solve my issue, the car still smokes a lot after idling (to be honest during idle you can see a bit of blue smoke from the exhaust), same after deceleration. I will try disconnecting the valve cover breathers, do I leave the PCV valve in? By engine oil drain pipe, do you mean the turbo oil drain?
    • What about if you just give it direct 12v and earth?
    • Hi guys . Can someone help me  I bought an Android screen for my Nissan fuga but it won't turn on   
    • My guesstimate, with no real numbers to back it up, is it won't effect it greatly at all.its not a huge change in position, and I can't see the air flow changing from in turbulence that much based on distance, and what's in front of it. Johnny and Brad may have some more numbers to share from experience though.
×
×
  • Create New...