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Sheldon Davis
Newbie
New South Wales
Soarer 1JZGTE

Posts: 2
Reg: 12-2013

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Thursday, January 16, 2014 - 11:32 am, by:  Sheldon Davis (Thirsty1) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hi All,
My 1JZ is holding back
I have had some recent issues relating to engine performance or lack there of.
My boost gauge is showing I'm making plenty of boost and the external waste gate seems to be doing as it should but when trying to accelerate it lags badly and won't make power.
Car makes good horsepower roughly 360atw and normally is a joy to drive so you can imagine my frustration when a Nissan Tida pulls away from me at the lights.. Not good for the ego trust me.. your thoughts PLEASE
Robert Day
DieHard
victoria
v8 & TT

Posts: 649
Reg: 01-2007

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Thursday, January 16, 2014 - 12:34 pm, by:  Robert Day (Lexsmaz) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

What are your coil packs like ?? & the connectors too ..
Boris Siljanoski
Goo Roo
Western Australia
LS400 + Soarer.

Posts: 2142
Reg: 11-2007

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Thursday, January 16, 2014 - 10:13 pm, by:  Boris Siljanoski (Z2tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Any Dash lights flashing ?
Shane Haverkamp
Goo Roo
nsw
soarer TT

Posts: 1040
Reg: 10-2007

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Monday, January 27, 2014 - 06:01 pm, by:  Shane Haverkamp (Havabeer) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

what mods do you have, as 360kw at the wheels isn't stock
Blake Gloyn
Goo Roo
manawatu
soarer JZZ30 TT

Posts: 1088
Reg: 02-2006

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Monday, January 27, 2014 - 08:00 pm, by:  Blake Gloyn (Blakenz) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

very difficult to make boost without making power. ie if the car is running poorly, then the exhaust flow is normally well down, which will reduce boost markedly. It seems strange to me...
Anyway, when you do finally log back onto our forum, let us know how you got on with this issue please.
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

Posts: 7542
Reg: 03-2006

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Monday, January 27, 2014 - 08:06 pm, by:  Daniel Clarke (Dieseltrain) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Blocked Cat will have those symptoms . All the noise and revs but no power or torque .
Sheldon Davis
Newbie
New South Wales
Soarer 1JZGTE

Posts: 4
Reg: 12-2013

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Thursday, January 30, 2014 - 02:34 pm, by:  Sheldon Davis (Thirsty1) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hi guys.
Sorry haven't got back to you as soon as I had hoped as I work remotely.
Just about to order all new coils and connectors and see if that helps also I'll look at the exhaust directly as I have also been given the same advise with possible blockages..
Once again I apologise on the delay getting back to you and I'll update as I progressively work through the many possible solutions.
Thanks heaps everyone!!!
Sheldon Davis
Newbie
New South Wales
Soarer 1JZGTE

Posts: 5
Reg: 12-2013

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Thursday, January 30, 2014 - 02:40 pm, by:  Sheldon Davis (Thirsty1) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Shane Haverkamp wrote on Monday, January 27, 2014 - 06:01 pm:



HKS GT3037 56T High mount turbo, Trust ECU, Custom piping, Blitz font mount intercooler.
Performance is excellent normally just got to sort through these few issues and get it back to normal.
Fingers crossed anyway Shane.
Sheldon Davis
Tinkerer
New South Wales
Soarer 1JZGTE

Posts: 6
Reg: 12-2013

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Thursday, January 30, 2014 - 02:41 pm, by:  Sheldon Davis (Thirsty1) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Boris Siljanoski wrote on Thursday, January 16, 2014 - 10:13 pm:



No dash problems Boris.
Jack Lloyd
TryHard
Northern Territory
JZZ30 TT

Posts: 128
Reg: 01-2012

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Saturday, February 01, 2014 - 06:57 pm, by:  Jack Lloyd (J_lloyd) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hey Sheldon, is the Trust ecu a piggy back or standalone? Could be the o2 sensor or map thats causing you greif.
Boris Siljanoski
Goo Roo
Western Australia
LS400 + Soarer.

Posts: 2153
Reg: 11-2007

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Saturday, February 01, 2014 - 11:20 pm, by:  Boris Siljanoski (Z2tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Slipping transmission perhaps, in that case it may not boost like it did before but still worth considering
Matthew Salkeld
TryHard
South Australia
1JZ powered 180sx

Posts: 157
Reg: 07-2008

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Sunday, February 02, 2014 - 07:41 am, by:  Matthew Salkeld (Munkymatt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

checked your coilpacks? could be misfire
Sheldon Davis
Tinkerer
New South Wales
Soarer 1JZGTE

Posts: 7
Reg: 12-2013

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Tuesday, February 04, 2014 - 12:52 pm, by:  Sheldon Davis (Thirsty1) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Gents.
Well I just put a new cat and muffler on and it changed nothing...
Transmission not slipping and seems to be as normal.
So now it comes to changing coil packs and clips which are in transit from WA.
I'll get online now and get an O2 sensor as that did come up in the diagnostics but on advise from mechanic I was told that shouldn't be an issue... Makes no sense to me either!
Anyways I have my man box of tissues handy and a dwindling bank account and I shall update as i work through it.
Thanks again guys your support is appreciated greatly.
Sheldon Davis
Tinkerer
New South Wales
Soarer 1JZGTE

Posts: 8
Reg: 12-2013

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Tuesday, February 04, 2014 - 12:56 pm, by:  Sheldon Davis (Thirsty1) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Jack the ECU is a piggy back.
I'm onto the O2 sensor next.

Cheers
Robert Day
DieHard
victoria
v8 & TT

Posts: 670
Reg: 01-2007

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Tuesday, February 04, 2014 - 08:53 pm, by:  Robert Day (Lexsmaz) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

You got ripped off if they changed the Cat without looking to see if its blocked as it very obvious if its no good, if your Mechanic did it go some where else as He is in it for the money only ..
Sheldon Davis
Tinkerer
New South Wales
Soarer 1JZGTE

Posts: 9
Reg: 12-2013

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Friday, February 07, 2014 - 06:14 pm, by:  Sheldon Davis (Thirsty1) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I took the car to an exhaust shop and he claimed it to be blocked and rattling.

Anyway I decided to try and replace the fuel ecu and some genius had cut it out and replaced it with a relay set up.
After I spent the time replacing the OEM wiring and fuel ecu the car would not run at all.
It appears as though the Walbro 255LPH fuel pump I put it to replace a noisy/failing one is drawing too much current and not pumping enough volume to support the ponies.
That would explain the hesitation in acceleration especially under load.
So I will replace the fuel pump again with a higher volume one and see if that resolves the old girls issues.
I will update when I have replaced the pump.
Cheers guys..
Be very aware of performance claims from people selling these pumps as they claimed this pump to handle over 500hp clearly not the case!!!
Robert Day
DieHard
victoria
v8 & TT

Posts: 673
Reg: 01-2007

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Friday, February 07, 2014 - 09:16 pm, by:  Robert Day (Lexsmaz) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

As far as the pump goes I have found the walbro to draw a pretty high current compared to a bosch motor sport one which is what I compared it to, ( from memory the bosch one was around 7 amps current draw & the walbro was around 15 amps ) so you need to check what pump you next put in as if you put another high current draw one in you will have the same problems with lack of flow as you have now ...
Jimmy Chapman
Tinkerer
SA
Jzz30 tt x2 jzz31na

Posts: 9
Reg: 12-2012

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Saturday, February 08, 2014 - 07:55 am, by:  Jimmy Chapman (Jimmy4) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

OK this might be a dumb solution but is the fuel filter blocked?
I've had similar problems with N/A motors ranging from petrol to diesel. It would also create higher amp on the fuel pump as its working harder ( at full pressure).
Robert Day
DieHard
victoria
v8 & TT

Posts: 674
Reg: 01-2007

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Saturday, February 08, 2014 - 11:42 am, by:  Robert Day (Lexsmaz) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Have you looked out the back when you are accelerating, as in does it blow massive loads of black smoke especially down lowish in the rev range & if so it might be actually getting to much fuel instead of not enough ?? & if its getting Way to much it feels similar to not enough fuel ..

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