Jump to content
SAU Community

Recommended Posts

  • Replies 91
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Posted Images

So I turned my tps to .51 and tested it out yesterday. With the engine off the throttle light doesn't come on at all with throttle changes. Starting it up it comes on at .57 I could move the throttle from .51 to .54 usually without rpm increasing then picks up from there. Getting up to .56 idle is slightly higher but still sounds fine. Going to .57 and the engine cuts out almost immediately but timing was still above 10. If I got off the pedal quick enough it would drop to 300rpm and 3-4 degrees and recover. Going past this point to .65 didn't have any problems but seems gutless when trying to take off and the more rpm comes down the worse it got.

Since I saw it stall a couple times but timing hadn't dropped I'm wondering if my fuel setting are too rich. I didn't know till after it was tuned but the intake cam was 6.5 degrees retarded and exhaust was 3.5 retarded. Both now are 0.25 retarded.

As I read that fuel settings of 100 are close to stoich I would have thought my idle area would all be 100. But my fuel 4x4 settings are

119.119.119.114

119.119.117.112

114.114.106.103

110.110.100.100

Are these too rich or not uncommon?

For timing its

18.18.18.26

18.18.18.26

18.18.28.33

18.23.30.34

I have this issue too. Wot is perfect but light throttle or slowly building boost, especially around 4k it misfires and stutters badly. Sometimes at low rpm too. It's not vaccuum to boost transition either its on boost. Sucks when u come to a hill and all u can do is go wot.

I have this issue too. Wot is perfect but light throttle or slowly building boost, especially around 4k it misfires and stutters badly. Sometimes at low rpm too. It's not vaccuum to boost transition either its on boost. Sucks when u come to a hill and all u can do is go wot.

Get the tune checked.

Also try turning off 02 feedback, may be an issue if the sensor is faulty

At work today changing final drive oil in a haul truck when BAM, a lightbulb goes off in my head and I facepalm myself. I bet the light on my hand controller for throttle isn't throttle and is actually VCT.

I get home and check the Powerfc FAQ and yep VCT is VTC on the controller. Can't believe I didn't realise earlier. So VCT is stalling the engine at just off idle and prob explains why its also gutless for the next couple hundred rpm but its fine above 1500.

Tomei spec for cams is 120' inlet and 115 exhaust. They were 126.75 inlet and 110.5 exhaust before I adjusted them back towards spec. Fark me :(

Called tuner today who said I'm prob running to lean around idle and needs fattening up now cams are dialled in. I thought about getting an rpm controller for switching VCT higher but he said it shouldn't be neccasary. I'm gonna try fatten it up a little and see how it goes shortly as I won't get to the tuner for a month or more. Or I'll disconnect VCT if necessary.

It only has a switch off point. It comes on at low RPM when it has met certain criteria from memory. if you stab the throttle you might hear it click but if you hold it on 1200rpm or so it will possibly be on then switch off as there is no load

The point of VCT is to increase low down torque so you want it on as early as possible, The Power FC has an off triger only for this reason

I think in your case you want to turn it on later for troubleshooting however?

So does this mean you have a potential overlap of VCT off on and user set fuel cut resumption in the same area and the two fighting each other and screwing things up ? It sounds like off idle VCT on is something else Apexi and Datalogit may not give us any say in .

Cam timing is something I should look into because I'm using those as well .

A .

He thought from what I said on the phone that I may have increased dramatically how much its breathing by dialling the cams and now its lean. By richening it up it will be more stable as VCT enables.

I have 256 poncams plus intake was 3 degrees more retarded than exhaust reducing overlap. But now I've advanced them both, more so intake.

I offered to get an rpm switch to control VCT but he was pretty confident he can sort it on the dyno.

as the others have said you cant change when VCT comes on, but you can set when it turns off

from memory

car must in gear

TPS must be open

NTR must be closed

RPM must be more than 1300rpm i think

before VCT will fire (the VTC switch will have a black dot)

to test the theory, start car, clutch in, hold clutch in, move into gear, keep holding clutch, rev in while holding clutch

PFC will think you are in gear, it will see TPS and NTR and VTC should fire

all you can do is disable VTC completely or change the kick off point, you cant change the kick on point

form memory its like between 1300rpm and 4500rpm (rb25 default)

so you could do like 1300rpm and 1350rpm if you wanted using datalogit to edit it

My VCT seems to work in Neutral

My NTR dot never changes though so maybe my Neutral switch doesnt work

+1

My neutral switch has been unplugged for 10 years now as it somehow used to bring my reverse lights on.

Once at operating temp its on at 1000rpm

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

    • Next on the to-do list was an oil and filter change. Nothing exciting to add here except the oil filter is in a really stupid place (facing the engine mount/subframe/steering rack). GReddy do a relocation kit which puts it towards the gearbox, I would have preferred towards the front but there's obviously a lot more stuff there. Something I'll have to look at for the next service perhaps. First time using Valvoline oil, although I can't see it being any different to most other brands Nice... The oil filter location... At least the subframe wont rust any time soon I picked up a genuine fuel filter, this is part of the fuel pump assembly inside the fuel tank. Access can be found underneath the rear seat, you'll see this triangular cover Remove the 3x plastic 10mm nuts and lift the cover up, pushing the rubber grommet through The yellow fuel line clips push out in opposite directions, remove these completely. The two moulded fuel lines can now pull upwards to disconnect, along with the wire electrical plug. There's 8x 8mm bolts that secure the black retaining ring. The fuel pump assembly is now ready to lift out. Be mindful of the fuel hose on the side, the hose clamp on mine was catching the hose preventing it from lifting up The fuel pump/filter has an upper and lower section held on by 4 pressure clips. These did take a little bit of force, it sounded like the plastic tabs were going to break but they didn't (don't worry!) The lower section helps mount the fuel pump, there's a circular rubber gasket/grommet/seal thing on the bottom where the sock is. Undo the hose clip on the short fuel hose on the side to disconnect it from the 3 way distribution pipe to be able to lift the upper half away. Don't forget to unplug the fuel pump too! There's a few rubber O rings that will need transferring to the new filter housing, I show these in the video at the bottom of this write up. Reassembly is the reverse Here's a photo of the new filter installed, you'll be able to see where the tabs are more clearing against the yellow OEM plastic Once the assembly is re-installed, I turned the engine over a few times to help build up fuel pressure. I did panic when the car stopped turning over but I could hear the fuel pump making a noise. It eventually started and has been fine since. Found my 'lucky' coin underneath the rear seat too The Youtube video can be seen here: https://www.youtube.com/watch?v=uLJ65pmQt44&t=6s
    • It was picked up on the MOT/Inspection that the offside front wheel bearing had excessive play along with the ball joint. It made sense to do both sides so I sourced a pair of spare IS200 hubs to do the swap. Unfortunately I don't have any photos of the strip down but here's a quick run down. On the back of the hub is a large circular dust cover, using a flat head screw driver and a mallet I prised it off. Underneath will reveal a 32mm hub nut (impact gun recommended). With the hub nut removed the ABS ring can be removed (I ended up using a magnetic pick up tool to help). Next up is to remove the stub axle, this was a little trickier due to limited tools. I tried a 3 leg puller but the gap between the hub and stub axle wasn't enough for the legs to get in and under. Next option was a lump hammer and someone pulling the stub axle at the same time. After a few heavy hits it released. The lower bearing race had seized itself onto the stub axle, which was fine because I was replacing them anyway. With the upper bearing race removed and the grease cleaned off they looked like this The left one looked pristine inside but gave us the most trouble. The right one had some surface rust but came apart in a single hit, figure that out?! I got a local garage to press the new wheel bearings in, reassemble was the opposite and didn't take long at all. Removing the hub itself was simple. Starting with removing the brake caliper, 2x 14mm bolts for the caliper slider and 2x 19mm? for the carrier > hub bolts. I used a cable tie to secure the caliper to the upper arm so it was out of the way, there's a 10mm bolt securing the ABS sensor on. With the brake disc removed from the hub next are the three castle nuts for the upper and lower ball joints and track rod end. Two of these had their own R clip and one split pin. A few hits with the hammer and they're released (I left the castle nuts on by a couple of turns), the track rod ends gave me the most grief and I may have nipped the boots (oops). Fitting is the reversal and is very quick and easy to do. The lower ball joints are held onto the hub by 2x 17mm bolts. The castle nut did increase in socket size to 22mm from memory (this may vary from supplier) The two front tyres weren't in great condition, so I had those replaced with some budget tyres for the time being. I'll be replacing the wheels and tyres in the future, this was to get me on the road without the worry of the police hassling me.
    • Yep, the closest base tune available was for the GTT, I went with that and made all the logical changes I could find to convert it to Naturally Aspirated. It will rev fine in Neutral to redline but it will be cutting nearly 50% fuel the whole way.  If I let it tune the fuel map to start with that much less fuel it wont run right and has a hard time applying corrections.  These 50% cuts are with a fuel map already about half of what the GTT tune had.  I was having a whole lot of bogging when applying any throttle but seem to have fixed that for no load situations with very aggressive transient throttle settings. I made the corrections to my injectors with data I found for them online, FBCJC100 flowing 306cc.  I'll have to look to see if I can find the Cam section. I have the Bosch 4.9 from Haltech. My manifold pressure when watching it live is always in -5.9 psi/inHg
    • Hi My Tokico BM50 Brake master cylinder has a leak from the hole between the two outlets (M10x1) for brake pipes, I have attached a photo. Can anyone tell me what that hole is and what has failed to allow brake fluid to escape from it, I have looked on line and asked questions on UK forums but can not find the answer, if anyone can enlighten me I would be most grateful.
    • It will be a software setting. I don't believe many on here ever used AEM. And they're now a discontinued product,that's really hard to find any easy answers on. If it were Link or Haltech, someone would be able to just send you a ECU file though.
×
×
  • Create New...