Jump to content
SAU Community

Recommended Posts

Tps voltage 0.5 with ignition on still 0.5 at idle. With ignition on and accelerator floored tps voltage 4.34. Tried the crab cleaner there was no change in idle, couldn't get underneath the intake but sprayed everywhere else.

I am fresh out of ideas last thing left is for me to have a go at the exhaust cam gear. I also shot a video that I will be trying to upload for you guys to see and make your own analysis.

Edited by Daboss
  • Replies 66
  • Created
  • Last Reply

Top Posters In This Topic

I was under the impression that no-one had successfully undertaken the internal vct supply mod. I guess to be absolutely sure that it is working as it is supposed to you would have to check on a dyno. Maybe you could try a timed 80 -120 run with the vct on and off and see if there is any difference.

Advanced exhaust cam gear 6 degrees engine is a lot smoother; still can feel vibration when sitting in the car and at idle vacuum is in the 10's.

Did a wide open pull in second full boost came on at around 4700rpm out of a holset hx40 with a twin scroll t4 .58 back housing. Pulled very stringly at the onset of boost enough to spin the tires at 12psi, Still needs a tune. Does that seem laggy?

Car still does not feel right, can not control idle from pfc stays around 1000rpm and when i lower it using the hand controller the rpm rises.

do a boost leak test see if you can find a leak... open the throttle as well with a brick on the pedal and spray soapy water on everything ...then find bubbles. do you have idle air control valve? or is it all ditched?

do a boost leak test see if you can find a leak... open the throttle as well with a brick on the pedal and spray soapy water on everything ...then find bubbles. do you have idle air control valve? or is it all ditched?

I have idle air control valve.

The brick on pedal is while doing the boost leak test?

Cams would reduce vacuum as well right? By reduce i mean going from -17 to -10.

I was under the impression that no-one had successfully undertaken the internal vct supply mod. I guess to be absolutely sure that it is working as it is supposed to you would have to check on a dyno. Maybe you could try a timed 80 -120 run with the vct on and off and see if there is any difference.

I have the internal mod successfully running vct on hks cams

if your vacuum has decreased then perhap more air is needed to bypass the throttle through the idle air control...have you played with that at all?

Yeah had a play with it. Didn't check to see if it increased vacuum but will when I go at it again. That's probably why it isn't working how it suppose to be. Use to be able to control idle perfectly with power fc. Guess I will mess with it again until I am able to control with the power fc again.

I have the internal mod successfully running vct on hks cams

Really? Ok how is your restrictor setup in the block? How does your car drive with it unplugged? Is there a noticeable difference with it on or off?

Mines doesnt work cause I did the idle test by activating it while car idling and there was no idle change and also I have it unplugged now and driveabilty is the same. No change at all.

Edited by Daboss

someone here will have the answer, but these are my thoughts and i'm still really learning so i could be wrong but advancing the exhaust cam timing will decrease overlap and increase cylinder pressure...which would lead to more heat being generated.

Edited by Badgaz

Yeah had a play with it. Didn't check to see if it increased vacuum but will when I go at it again. That's probably why it isn't working how it suppose to be. Use to be able to control idle perfectly with power fc. Guess I will mess with it again until I am able to control with the power fc again.

Really? Ok how is your restrictor setup in the block? How does your car drive with it unplugged? Is there a noticeable difference with it on or off?

Mines doesnt work cause I did the idle test by activating it while car idling and there was no idle change and also I have it unplugged now and driveabilty is the same. No change at all.

Vct is 1.5mm Middle blocked and rear 1.4mm. Idle is poor with the vct turned on and with it off the midrange is about 40kw less

Vct is 1.5mm Middle blocked and rear 1.4mm. Idle is poor with the vct turned on and with it off the midrange is about 40kw less.

Same specs with my build. Only thing is i havent been on a dyno to check power output as yet. Most definitely there is no idle change when vct activated at idle and it feels the same driving wise whether plug is on or off.

Other than the idle check i have noway of telling if it is actually always on, cause driveablity remains the same but that could be the effect of it always being on and idle is poor after cam install. Vacuum at idle is in the -10's rising the more rpm I make without getting into boost.

Checked and rechecked timing, added and subtracted both fuel and ignition timing, opened and closed idle air control valve, adjusted tps sensor and advanced exhaust cam gear 6 degrees.

Everything is within spec just idle is not as smooth as i would like it to be car vibrates and engine shakes to much. It is not horrid just a little off and its bugging the hell out of me.

The cam gear advance seemed to help a bit but didn't want to go any further than that as it seemed to far advance at 6.

So I am back to it either being vct or cams, also i have a very small gap on my spark plugs,

its odd that you cant adjust the revs lower than 1000rpms, what gap are the plugs? are they getting wet cause once there wet it will never idle smooth.

Plugs are gapped very tightly. I am thinking they are .5mm. Have not checked the plugs for wetness. I reinitialized the power fc and did the idle learn again, Rpm is steady at 950/1000 according to hand controller and I have it set at 900. That is with the idle air screw opened all the way. Didnt try to adjust with hand controller as it was kinda idling within spec.

Feel that controlling the idle is within my grasp as it is now idling steadily between 950 and 1000 and i have a few adjustments I can make to get it as close to perfect as I can.

What injectors?

650cc about to be changed to 850cc top feed denso.

Problem seems to be solved. CAS was broken. Car now idles as before with a slight miss but no violent shaking. I have noticed that my water temperature gets noticeably higher than what I am use to. Use to seeing about 95c to 98c staying there under normal conditions and boosting with fans running as soon as hood opened with fans on temps would drop down to low 80'sand thermo fans would cutoff. Temps would build back up fans cut back on and so on and so on.

Now the temp gets to 102c and stays there even with hood open, fans on and after a hard run.

Can advancing the exhaust cam gear raise water temps? I ask because while trying to fix idle problem I had advance the exhaust cam 6 degrees and have not placed it back to normal.

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

    • Can perhaps see how the R33 appreciators would think so.  
    • Thanks, I removed the fuse and the relay from the car and made my own circuit with them to test them with a test bulb.  I will look for the wiring diagram and go from there.
    • Jdm DC2R is also nice for a FF car compared to the regular hatches of the time.
    • Now that the break-in period for both clutch and transmission is nearly over I'd like to give some tips before I forget about everything that happened, also for anyone searching up how to do this job in the future: You will need at least 6 ton jack stands at full extension. I would go as far as to say maybe consider 12 ton jack stands because the height of the transmission + the Harbor Freight hydraulic platform-style transmission jack was enough that it was an absolute PITA getting the transmission out from under the car and back in. The top edge of the bellhousing wants to contact the subframe and oil pan and if you're doing this on the floor forget about trying to lift this transmission off the ground and onto a transmission jack from under the car. Also do not try to use a scissor jack transmission lift. You have to rotate the damn thing in-place on the transmission jack which is hard enough with an adjustable platform and a transmission cradle that will mostly keep the transmission from rolling off the jack but on a scissor lift with a tiny non-adjustable platform? Forget it. Use penetrating oil on the driveshaft bolts. I highly recommend getting a thin 6 point combination (box end + open end) wrench for both the rear driveshaft and front driveshaft and a wrench extension. These bolts are on tight with very little space to work with and those two things together made a massive difference. Even a high torque impact wrench is just the wrong tool for the job here and didn't do what I needed it to do. If your starter bolts aren't seized in place for whatever reason you can in fact snake in a 3/8 inch ratchet + 6 point standard chrome socket up in there and "just" remove the bolts for the starter. Or at least I could. It is entirely by feel, you can barely fit it in, you can barely turn the stupid ratchet, but it is possible. Pull the front pipe/downpipe before you attempt to remove the transmission. In theory you don't have to, in practice just do it.  When pulling the transmission on the way out you don't have to undo all the bolts holding the rear driveshaft to the chassis like the center support bearing and the rear tunnel reinforcement bar but putting the transmission back in I highly recommend doing this because it will let you raise the transmission without constantly dealing with the driveshaft interfering in one way or another. I undid the bottom of the engine mount but I honestly don't know that it helped anything. If you do this make sure you put a towel on the back of the valve cover to keep the engine from smashing all the pipes on the firewall. Once the transmission has been pulled back far enough to clear the dowels you need to twist it in place clockwise if you're sitting behind the transmission. This will rotate the starter down towards the ground. The starter bump seems like it might clear if you twist the transmission the other way but it definitely won't. I have scraped the shit out of my transmission tunnel trying so learn from my mistake. You will need a center punch and an appropriate size drill bit and screw to pull the rear main seal. Then use vice grips and preferably a slide hammer attachment for those vice grips to yank the seal out. Do not let the drill or screw contact any part of the crank and clean the engine carefully after removing the seal to avoid getting metal fragments into the engine. I used a Slide Hammer and Bearing Puller Set, 5 Piece from Harbor Freight to pull the old pilot bearing. The "wet paper towel" trick sucked and just got dirty clutch water everywhere. Buy the tool or borrow it from a friend and save yourself the pain. It comes right out. Mine was very worn compared to the new one and it was starting to show cracks. Soak it in engine oil for a day in case yours has lost all of the oil to the plastic bag it comes in. You may be tempted to get the Nismo aftermarket pilot bearing but local mechanics have told me that they fail prematurely and if they do fail they do far more damage than a failed OEM pilot bushing. I mentioned this before but the Super Coppermix Twin clutch friction disks are in fact directional. The subtle coning of the fingers in both cases should be facing towards the center of the hub. So the coning on the rearmost disk closest to the pressure plate should go towards the engine, and the one closest to the flywheel should be flipped the other way. Otherwise when you torque down the pressure plate it will be warped and if you attempt to drive it like this it will make a very nasty grinding noise. Also, there is in fact an orientation to the washers for the pressure plate if you don't want to damage the anodizing. Rounded side of the washer faces the pressure plate. The flat side faces the bolt head. Pulling the transmission from the transfer case you need to be extremely careful with the shift cover plate. This part is discontinued. Try your best to avoid damaging the mating surfaces or breaking the pry points. I used a dead blow rubber hammer after removing the bolts to smack it sideways to slide it off the RTV the previous mechanic applied. I recommend using gasket dressing on the OEM paper gasket to try and keep the ATF from leaking out of that surface which seems to be a perpetual problem. Undoing the shifter rod end is an absolute PITA. Get a set of roll pin punches. Those are mandatory for this. Also I strongly, strongly recommend getting a palm nailer that will fit your roll pin punch. Also, put a clean (emphasis on clean) towel wrapped around the back end of the roll pin to keep it from shooting into the transfer case so you can spend a good hour or two with a magnet on a stick getting it out. Do not damage the shifter rod end either because those are discontinued as well. Do not use aftermarket flywheel bolts. Or if you do, make sure they are exactly the same dimensions as OEM before you go to install them. I have seen people mention that they got the wrong bolts and it meant having to do the job again. High torque impact wrench makes removal easy. I used some combination of a pry bar and flathead screwdriver to keep the flywheel from turning but consider just buying a proper flywheel lock instead. Just buy the OS Giken clutch alignment tool from RHDJapan. I hated the plastic alignment tool and you will never be confident this thing will work as intended. Don't forget to install the Nismo provided clutch fork boot. Otherwise it will make unearthly noises when you press the clutch pedal as it says on the little installation sheet in Japanese. Also, on both initial disassembly and assembly you must follow torque sequence for the pressure plate bolts. For some reason the Nismo directions tell you to put in the smaller 3 bolts last. I would not do this. Fully insert and thread those bolts to the end first, then tighten the other larger pressure plate bolts according to torque sequence. Then at the end you can also torque these 3 smaller bolts. Doing it the other way can cause these bolts to bind and the whole thing won't fit as it should. Hope this helps someone out there.
×
×
  • Create New...