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

    • Even more fun, leave all the ADAS stuff plugged in, but in different locations, hopefully avoid any codes!   And honestly, all these new cars with their weird electronics. Pull all the electronics out Duncan, and just shove an aftermarket ECU and if needed a trans controller in, along with a PDM. Make it run basic but race car styled!
    • To follow up a question from earlier too since I had the front bar off again (fking!) This is what is between the bumper and the drivers side wheel And this is the navigator side, only one thing but its a biggy! So basically....no putting coolers in the wheel arches without a lot of moving other stuff. Assuming I move to properly race prepping this car I'll take that job on and see how the computers respond to removing a whole bunch of ADAS modules
    • So I prepped the car for another track day on Wednesday (will be interesting to see coolant temps post flushing out and the larger reservoir, with a forecast of 3-14 being 20o cooler than last time I took it out). Couple of things to mention; since I am just driving the car and not taking a support vehicle, I took the rear seats out and just loaded the back up Team Trackday style. Look at all that space! To cover off removing the rear seat....it is weird (note the hybrid is probably different because it wouldn't have folding rear seats) Basically, you remove the lower seat base, very similar to a r series but it is a clip that pulls forward to release the base rather than it being bolted down. Easy Then, you need to remove the side section of the rear seat on each side. There is a 14mm head nut at the bottom of the side piece, the it slides upwards off a hook at the top to release; you also need to unhook the seatbelt from the loop at the top. Then the centre piece is weird. You need to release/fold the seats forward with the tab in the boot on each side From there, there are 2,x12mm headed bolts holding the rear of each seat to the folding bracket, under the trim between the rear seat and the boot (4x christmas tree clips there, they suck). The seat is out but you can see where the bolts attach to the bracket
    • As discussed in the previous post, the bushes in the 110 needed replacing. I took this opportunity to replace the castor bushes, the front lower control arm, lower the car and get the alignment dialled in with new tyres. I took it down to Alignment Motorsports on the GC to get this work done and also get more out of the Shockworks as I felt like I wasn't getting the full use out of them.  To cut a very long story short, it ended up being the case the passenger side castor arm wouldn't accept the brand new bush as the sleeve had worn badly enough to the point you could push the new bush in by hand and completely through. Trying a pair of TRD bushes didn't fix the issue either (I had originally gone with Hardrace bushes). We needed to urgently source another castor arm, and thankfully this was sourced and the guys at the shop worked on my car until 7pm on a Saturday to get everything done. The car rides a lot nicer now with the suspension dialled in properly. Lowered the car a little as well to suit the lower profile front tyres, and just bring the car down generally. Eternally thankful for the guys down at the shop to get the car sorted, we both pulled big favours from our contacts to get it done on the Saturday.  Also plugged in the new Stedi foglights into the S15, and even from a quick test in the garage I'm keen to see how they look out on the road. I had some concerns about the length of the LED body and whether it'd fit in the foglight housing but it's fine.  I've got a small window coming up next month where I'll likely get a little paint work done on the 110 to remove the rear wing, add a boot wing and roof wing, get the side skirt fixed up and colour match the little panel on the tail lights so that I can install some badges that I've kept in storage. I'm also tempted to put in a new pair of headlights on the 110.  Until then, here's some more pictures from Easter this year. 
    • I would put a fuel pressure gauge between the filter and the fuel rail, see if it's maintaining good fuel pressure at idle going up to the point when it stalls. Do you see any strange behavior in commanded fuel leading up to the point when it stalls? You might have to start going through the service manual and doing a long list of sensor tests if it's not the fuel system for whatever reason.
×
×
  • Create New...