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Camshaft instalation probs! HELP!

bbenny

By bbenny,
in Engines & Forced Induction

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bbenny Mentor

bbenny

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hey a quick question to anyone reading this with adj cam gears (OS Giken in particular) how many degrees is each index mark on the slider?

ie. 1 point (index) = 2degres???????

oh and a dummy one to make sure, turning anti-clockwise on the adjustments is retarding while clockwise is advancing? - just to be sure!

Oh and while pulling it all apart i found the cause for my inlet being so tight! i just wonder now whether that was the main problem with the GTR cams for not holding idle!

mabru Enthusiast

mabru

Posted
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Hehe,

My car has been sitting too long for my tastes and I've been getting lots of static from the wife about how "everytime you buy something, that car doesn't run afterwards." I'll go back to the RB26 cams in a bit, but I think I'll get some adj. cam gears and get an ECU remap first.

-Matt

bbenny Mentor

bbenny

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haha Matt i know your pain, but i have a nagging girlfriend instead of a wife.. so i just threaten to dump her if she says anything bad about my car!

But like you my car has sat too long and i cant afford a retune or PFC at the moment.

oh and the reason it was stiff, was actually due to the camshaft clamps being on the opposite way around, as in they needed to be turned 180deg. they were in the right order, just not the right direction!

the worst part is i put them back exactly they way they were on in the first place! so some idiot once put them on the wrong way, anyway they are smooth like butter now, and im sure that the GTR cams would probably WORK!!!!!! but i have already promised them to someone and spent the money on adj cam gears!

So looks like ill get my car running and give the GTR cam thing another shot sometime in the future.

So good luck to all those that are still going ahead with it. you will prob find it works regardless of you ECU type.

WazR32GTSt Grand Master

WazR32GTSt

Posted
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just some thoughts on the topic (i'm trying to think of anything to try to alleviate this problem)...

some guy on the forums put NA rb20 cams into his car (232deg and 7.8mm lift) and he had no problems with the install from memory. so the altered duration isn't the problem. what i don't understand is that its happening for these particular cams when normal aftermarket cams work in the rb20??

out of curiosity, what spark plug gap are you guys running? maybe it needs 1.1mm gap to work properly? or if you are running 1.1mm already (most aren't) then you might need to go to 0.8mm... hmmm?? yeah you're right i'm probably talking about unrelated shit!

my cams should be here by the end of the week...! its gunna work!

Waz.

bbenny Mentor

bbenny

Posted
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well im beggining to think that maybe the reason mine wouldnt hold idle was due to the increased effort needed to turn the engine as the inlet cam was very stiff to turn.

If it wasnt that then it has to be the standard ECU.

mabru Enthusiast

mabru

Posted
Posted

I'm pretty sure all my cam brackets went on the way they came off and I did not see any markings on them (are there any?) The strange thing is that when we first started the car after the install of the RB26 cams it actually DID idle. On the drive home is when it started to freak out and during that time I popped off an intercooler pipe. I'm thinking it's the ECU. I still don't understand how Tomei, HKS, etc.. are able to run if the RB26's won't. I mean afterall the RB26 cams are really quite similar with higher lift.

If someone with the standard ECU gets this to work, please enlighten us.

-Matt

Chris32 Veteran

Chris32

Posted
Posted
what about chaning just the inlet cam? maybe it will idel? or just the exhaust cam?

if Tomei cams work there is no reason the rb26 cams shouldn't work there is something being overlooked here...

Couldn't agree more -

all down to one thing I reckon - Managment, or the lack of. A programmable computer is a 'must have' I think

Chris

Chris32 Veteran

Chris32

Posted
Posted

will be interesting to see......

I think the issue everyone was having is that there is more air for every revolution (having greater lift on the GTR cams) being pumped through the engine,and the stock computer can't work it out.

Would be intersting to see if the programming would still work at WOT, as it would be relying on the airflow meter signal to determine how much air is going in..........

Will be good to find out if it is the case

ylwgtr2 Grand Master

ylwgtr2

Posted
Posted
will be interesting to see......

I think the issue everyone was having is that there is more air for every revolution (having greater lift on the GTR cams) being pumped through the engine,and the stock computer can't work it out.  

Would be intersting to see if the programming would still work at WOT, as it would be relying on the airflow meter signal to determine how much air is going in..........

Will be good to find out if it is the case

hmmm the air still needs to come from somewhere and its through the afm so i am assumeing the thing should still run....

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