Injection pump timing (1KZ-TE)

[KZJ90 Member Find all posts View Profile Close KZJ90]

Has anyone adjusted the injection timing (1KZ-TE)? I think I could try to adjust it a little bit earlier. For the power and the fuel economy, you know. :wink: Toyota might be adjusted it for emission laws, not for optimal power.

I know there is a punching line and upper processing surface which should be aligned. Little bit more space between those... to the upper edge? Would it make couple degrees or even 5?

[MickL Addicted PP Member Find all posts View Profile Close MickL]

Re: Injection pump timing (1KZ-TE)

For the power and the fuel economy, you know.

First of all, you have to choose what you want: performance or economy. Unfortunately you can't have both.

Decreasing timing will result in better emissions and fuel economy at the expense of power.

Increasing the timing results in increased cylinder pressures and higher peak flame temperatures which leads to a more complete burn of the fuel injected.
Off boost performance increases however you will have increased turbo lag. It also increases cylinder pressures (which obviously won't show on a boost gauge but cause significant stress increases)

The effect on emissions is significant the NOx level increases dramatically past just a couple of degrees of advance and brake specific fuel consumption drops off quickly as well.


Have you increased fueling and boost? much better result than dicking with pump timing. Pump timing should be though of more as a "fine" tuning.

You'll need a boost gauge and pyro as a minimum before doing boost/fuel mods. Timing is best done in congunction with a dyno run and NOx/hydrocarbon/carbon monoxide readings (not just for emissions but to know whats happening in the cylinder/burn)

Mick

[KZJ90 Member Find all posts View Profile Close KZJ90]

Re: Injection pump timing (1KZ-TE)

First of all, you have to choose what you want: performance or economy. Unfortunately you can't have both.

I donīt swallow that... :?

Have you increased fueling and boost? much better result than dicking with pump timing. Pump timing should be though of more as a "fine" tuning.

You'll need a boost gauge and pyro as a minimum before doing boost/fuel mods. Timing is best done in congunction with a dyno run and NOx/hydrocarbon/carbon monoxide readings (not just for emissions but to know whats happening in the cylinder/burn)

I have adjusted the spill control valve: http://toyotasurf.asn.au/forum/viewtopic.php?t=14193 And I have van Aaken Smartbox. The boost is about 0.85 bar.

I also have the boost and EGT-gauges. So, Iīm doing "fine" tuning. The injectors are now in the garage, they install new nozzles and adjust opening pressure to 160 bar.

And by the way, Iīm using vegetable oil/diesel blend 50/50%.

[KZJ90 Member Find all posts View Profile Close KZJ90]

Re: Injection pump timing (1KZ-TE)

Now itīs adjusted. I moved the pump upwards about 2 mm. I calculated it makes about 2 degrees more advance. Should be ok, I think.

Iīll tell you how it behaves, after I get the new cylinder head at itīs place.

[MickL Addicted PP Member Find all posts View Profile Close MickL]

Re: Injection pump timing (1KZ-TE)

I read your post on the Surf forum with some interest.
It seems your pump is a little different to ours. While yours is fitted with a manually set Spill valve, on the Australian Prado 1kz it’s an electronic valve with its modulation controlled by the ECU.

Also the Australian 1kz has a pump timing sensor, not sure if your pump has this. I'm interested to see if changing the base timing as you have makes a significant difference or if the ECU will compensate for the adjustment to some extent?


Mick

[KZJ90 Member Find all posts View Profile Close KZJ90]

Re: Injection pump timing (1KZ-TE)

I read your post on the Surf forum with some interest.
It seems your pump is a little different to ours. While yours is fitted with a manually set Spill valve, on the Australian Prado 1kz it’s an electronic valve with its modulation controlled by the ECU.

Also the Australian 1kz has a pump timing sensor, not sure if your pump has this. I'm interested to see if changing the base timing as you have makes a significant difference or if the ECU will compensate for the adjustment to some extent?


Mick

I think itīs the same pump or similar. Mine is controlled by ECU, as yours. There goes wires in the spill control valve, there is a hat on the screw, thatīs why you may not recognize it.

There is the Timing Control Valve too and everything else you can see in Toyota 1KZ-TE Engine Repair Manual (Aug., 1999). I think you have downloaded it too.
I think that the ECU can adjust the timing by Timing Control Valve by information which other sensors give to it. But it seems that the ECU canīt know where the zero point (basic setting) of the pump is.

[MickL Addicted PP Member Find all posts View Profile Close MickL]

Re: Injection pump timing (1KZ-TE)

I think it’s the same pump or similar. Mine is controlled by ECU, as yours. There goes wires in the spill control valve, there is a hat on the screw, that’s why you may not recognize it.

The pumps are similar but the spill control valve on mine is different. Extra fuelling on mine could only be achieved with a piggy back computer. I believe yours is a mechanical valve (hence the provision for adjustment) with the wires being for the fuel cut off. The version on my pump is an electrical solenoid with no means of mechanical adjustment.



Mick

[KZJ90 Member Find all posts View Profile Close KZJ90]

Re: Injection pump timing (1KZ-TE)

The pumps are similar but the spill control valve on mine is different. Extra fuelling on mine could only be achieved with a piggy back computer. I believe yours is a mechanical valve (hence the provision for adjustment) with the wires being for the fuel cut off. The version on my pump is an electrical solenoid with no means of mechanical adjustment.

Oh well, it really is different. Your car is so much newer (mine is -96).

[MickL Addicted PP Member Find all posts View Profile Close MickL]

Re: Injection pump timing (1KZ-TE)

Your car is so much newer

I've done some more investigating and I'm led to believe there was a change in engine management/pump control around 2000 and one around 2003 for the fly by wire throttle and variable EGR valve controlled by the ecu.

Just for the sake of being curious; I have access to a 98 KZN185 so I'll check out it's pump tomorrow.


Mick

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Re: Injection pump timing (1KZ-TE)

I have access to a 98 KZN185 so I'll check out it's pump tomorrow.

Finally got around to this :roll: KZN185 and Hilux is same set up as yours:




Mick

[KZJ90 Member Find all posts View Profile Close KZJ90]

Re: Injection pump timing (1KZ-TE)

I have access to a 98 KZN185 so I'll check out it's pump tomorrow.

Finally got around to this :roll: KZN185 and Hilux is same set up as yours: [pic]


Mick

Yes, it looks exactly similar compared to mine. Just the hat off and one turn more, and the joy begins.

I have forgot to tell how it goes after pump timing adjustment. Well, itīs ok, little less low end torque, but it goes easier at highway speeds (80> km/h). The fuel consumption is about 5% lower than before. The idle is a little bit sharper.

Iīm happy with results.

[nana0665 Lurker Find all posts View Profile Close nana0665]

Re: Injection pump timing (1KZ-TE)

Hi Guys. This is one of the best posts I read on 1kzTE. I've got a second hand KZJ95 with the same pump. I am tempted to turn it anti clock wise since I always thought the fuel burn is too high. Over 3000RPM it always throws black smoke with the turbo lag.

I am a bit scared to drop the spraying pressure. I also feel the idle will jurk. What are your views?

Regards

AN

[radical beek Lurker Find all posts View Profile Close radical beek]

1kz-te pump correction resistors

I've just done the correction resistor mod on my 95 series shorty.
Used trim pots on extension wire to the cab.
set the brown resistor to .31k ohms and the advance to 1.8komhs
Took the main butterfly out and blocked the EGR.
The truck now only pulls 9.7psi boost and a max of 720Deg C when really loaded but cruises at much lower EGT than before.
Before the mod it would zoom through 850 Deg C if you took your eye of the ball.
It will be interesting to see the fuel economy numbers.
I convinced that the retarded over fueling set up of the original engine is the main cause of the head issues these motors have.
Also, if you drop the fueling resistance below .30kohms the overdrive ceases to operate on the Auto trans.
Did Mr T see me coming?