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What is the redline for a TD42?


skid
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What is the redline for a TD42? I have a 2000 GU which had a heart transplant being a 1990 silver top turbo, as the truck was originally a 3.0 ZD and still has all the original guages would like to know where I can safely rev it to... Also is it normal for it to blow smoke when I hit the pedal and it boosts up to 12PSI?

Edited by skid
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TD42 has a mechanical rev limiter so once warmed up floor it and watch it to cut out if you are brave, anyway max RPM 4600 +/- 50/150. Pretty much the same as ZD30.

It is kinda normal especially if the engine has reasonably kays travelled, TD42 boosting to 12 psi is OK.

Cheers

 

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You have me concerned about the "brave" comment

What about the smoke? its more noticeable at night with headlights behind me looking in the rear vision mirror...

What about the boost falling away when I rev it out?

Are these things normal?

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Hmmmmmm..... at 4500 rpm its going to sound like not only the the valves are trying to climb out of the engine!!!

These motors are not really made to be wound up to the max revs, but...... and in my opinion at 12psi boost, you won't get much more out of that motor after 4000 rpm. Your torque and Kw curve is going to drop fairly quick at around that rpm. Mine with 240 odd thousand Km on will climb to 4000rpm, but i get better performance if I change gears at 3600 -3700 rpm. My peak torque and Kw happens at about 3200 rpm, so I play in that zone.

What colour smoke are you bellowing out the exhaust under full load?

If white smoke at high rpm ..... you have some serious oil issues that need to be sorted out 

If black smoke at high rpm...... then you might either need to turn back the fueling ( depending on your EGT temps ) or get more air in there ( up the boost slightly )

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I get a puff of white smoke when I start it when its been standing for a little while, cant tell the color of the smoke at night its more of a haze, did notice the other day when I took off from a set of lights the car behind me backed off as there was smoke, which was dark but wouldnt say black....

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I get a puff of white smoke when I start it when its been standing for a little while, cant tell the color of the smoke at night its more of a haze, did notice the other day when I took off from a set of lights the car behind me backed off as there was smoke, which was dark but wouldnt say black....

Puff of white smoke on startup or on pull away from a traffic light is usually valve stem seals that are worn out. This is quite an easy thing to replace oneself.

Mine is boosting at about 0.7 bar ( 10 psi ), but the fuelling is set more for a 0.8 - 0.85 bar ( 12 - 13 psi ) boost..... I've just been too lazy to fiddle with the boost. So when I do a fast pull away, I drown the little dinky cars in a wonderful cloud of black ( grey) smoke. until I hit max boost then the smoke is a lot less. If I sit at 100km/h and want to accelerate to 120km/h without gearing down and I put my foot flat, I again get a bellowing of smoke till my boost is up to max, then when I ease up on the accelerator peddle the smoke disappears too. 

At night it looks a lot more intimidating than during the day. I wouldn't stress too much. Crank the boost up a fraction and see if it makes a difference

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3500 rpm should be easily achieved, 3500 to 4000 a little more difficult, as you are now coming out of the power bands. I think a little more boost, and possibly a slight timing adjustment ( possibly to advance timing ) will get you the performance you should have.

Are you still running the TD42 off of the ZD30 gearbox? I'm not too clued up on the gearbox side but maybe that is playing a roll.... hopefully someone can clarify ......

Oh .... by the way a little black smoke under load is not anything to stress over, just ensure that your EGT temps are not going too high. 

The probe on mine is fitted pre turbo and my EGT gauge ( Pyro ) alarm is set for max 640 deg C. For me that is enough power relative to the safety of my motor

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Yeah geraboxes are same just the ratios are different TD42 as well as the diff ratios are different ZD30 has 4.11 while TD has 4.3.

Technically it is only the drive gear set which is different ratio and then makes combined/overall ratios for each gear different otherwise the gears for 1-5 are the same.

So

Drive .....                                      ZD30                              TD42

                                                  1.259:1                            1.346:1

 

1st      3.385:1 + drive               4.262:1                            4.556:1

2nd     1.95:1 + drive                 2.456:1                            2.625:1

3rd      1.182:1 + drive               1.488:1                            1.590:1

4th      1.0:1 -no drive step down just direct through main shaft

5th     0.676:1 + drive                0.851:1                            0.836:1

R        3.15:1 + drive                  3.972:1                            4.245:1

 

knowing Nissan they probably changed it around during the GU life as well

indeed in 2004 they swapped the ratios around between TD42T and ZD30Di.

 

They also changed diff ratios as well TD42T had 3.9:1 instead 4.11:1 for TD42 with M/T and ZD30 with A/T had 4.375:1

Trying to keep up with this is like wondering what was first: the chicken or the egg!

Nissan is well known for deliberately building different batches of Y61 with completely different sets of gear, like what they had lined up next to assembly line. There is no clear pattern to it. The only sure thing was no auto tranny with TD42/T motors in Y61(GU/GR) unlike Y60 (GQ).

 

Cheers

Edited by Rumcajs
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