Hi all. After fitting another engine and a HKS EVC5 a while back I decided to try increasing the boost above 10psi today. The ECU has a JWT chip installed so it should cope with 12 psi and more but I could hear pinking/detting once the boost went much over 10psi. Does anyone know if the JWT chip still has the "safety boost" fuel map cos I suspect this might be due to lack of fuel? Could a faulty lambda/knock sensor fuel pump/controller or even injector cause this? I'm in the dark with this one!

 

Cheers

 

Dave.

What is your ignition timing set to ?

Hi Andy, I've no idea! I'm gonna try and get hold of a lamp tomorrow and check it properly. Prior to fitting the HKS EVC5, I was only getting 7psi boost with and without the boost limiter solenoids connected (maybe they're normally powered up though) but an ECU check didn't show the usual 34 to indicate an O/C det sensor?

 

Cheers

Hey Dave ive goy a lamp if you need it and im in Bangor tommorrow.

Hi Dave,

 

IIRC, the JWT chip uses the same maps even for safety.

 

Vijay

Thanks Steve, I work in Bangor so that would be great if you're sure you don't mind.

I never knew the JWT chip still had the safety map - cheers Vijay. I may try the 1 Meg resistor trick to see if I get normal 9psi without the HKS EVC connected cos I've just found out that the ECU doesn't always give a code 34 when the det sensor is faulty!

Yeh no probs ill take it in to work with me tomorrow i work at the water treatment works at Park Menia you can proberlbly see my crane when you come over the bridge.

Give us a ring on 07775684169.

Yep, check the timing and the fuel pressure, also check the hose clamps between the MAS and the turbo inlets....

Thanks Andy. Funny you should mention FUEL. Noticed a strong smell of it when I opened the hood! After I've fixed the leak I'll check the timing etc. Do you think that the leak could have contributed to this fault?

Doubt it, if it was leaking enough to reduce the pressure you'd be standing in a puddle of it ! What Andy meant was check the fuel pump/pressure regulator are working right.

LOL!! I checked the timing and it was 30 deg BTDC@750rpm :eek: :eek: Adjusted and she runs like a dream. :). All I can say is a big thanks to all of you for your advice and of course a big thankyou to Steve for lending me the timing gun. We also checked Shaunmac's and his was 30 deg BTDC too :eek: but his wasn't pinking at all :confused: .

 

I'm :hyper: :hyper: :hyper: :hyper: :hyper: now!

 

Cheers

 

Dave

 

 

 

 

Doubt it, if it was leaking enough to reduce the pressure you'd be standing in a puddle of it ! What Andy meant was check the fuel pump/pressure regulator are working right.

Holy crap that is miles out ! Why would both cars be out by the same amount ? Don't wanna take the p155 but you did use the timing light correctly on the #1 cylinder and used the correct timing marks on the pulley etc ?

That's what I thought after finding Shaun's to be so far out too. I used the diagram below to locate cyl 1 & the notch in the crank pulley was clear to see as was the timing scale.

 

 

Holy crap that is miles out ! Why would both cars be out by the same amount ? Don't wanna take the p155 but you did use the timing light correctly on the #1 cylinder and used the correct timing marks on the pulley etc ?

Was it an inductive type pickup? Did you use it on the loop of the PTU connector? If so you MUST use it with the clamp held open or it will read around.... well.... 30 deg BTDC ;) Not sure why this is, but you mustn't let the clamp close over the wire...

No, we took out the coil pack & put an extra HT lead from the HT output feed via the gun to the spark plug if you know what I mean. Not the easiest method - LOL!

Certainly not the easiest method LOL!!!! I still doubt the reading if both cars read the same. 30 degrees will cause det on any car lol. In fact WELL before 10psi! Where abouts is the CAS in its adjustment range? They usually sit bang in the middle or near enough... (bolt position in the slot)

I think you're right Andy. Drove it to work today and it was noticeably slower. May have to take it to Nissan dealer or get an inductive gun.

Its a bit of a wild stab in the dark, but I've seen a few where the cambelt slips a tooth or two, causing the CAS to read wrongly in relation to the crank, since its driven off the camshaft ;)

It's overdue a new belt anyway tbh, looks like a good time to do it!!

 

Cheers

 

Dave.

Wound CAS back a bit tonight and it ran much better but now it's started to run on 5 if I boot it :confused: must be a plug expiring or coil pack :o - I wonder what's in store for tomorrow :D :D. Thanks for your advice chaps.

 

I need to change the subject - Errm - how are PNE doing?

That'll be the ecu picking up the det and retarding the ignition - seen it on a few cars - safety boost (timing wise) causes the car to splutter like hell :confused: Something is causing it to det... but what? :D