getting to know a my new 1hdt

[franklin40]

ive just had a 1hdt swapped with an h55 into my fj62. so far I have about 2000km on it. I have a few questions and one interesting problem.

the zoolander issue... when I turn right, a long slow right like an off ramp, it'll stall. it only happens when the fuel tank is less than 1/3 full. is this a shifting fuel phenomenon in the tank causing starvation. if I drop out of gear and rev it I can sometimes save it but a few times it has stalled. as far as I understand fuel lines and filter are all brand new.

second is my gearing is now wrong in my diffs. I'm revving about 2500 at 100kph as I have 4:56 gears. what is the ideal rpm range at 100kph this engine likes to run at? that'll give me a target to shoot for when regearing. I want to be able to tow with it so don't want to go too high with e gears. will be inter cooling it and have a rebuild 4 core rad in it. I have a bigger turbo on it now but haven't turned the fuel up yet. not until intercooler later next year.

that's it for now. I'm sure I'll be asking more as time goes by and as I dig I to learning more about diesels in general.

 

[dousty]

Do you need to bleed the system to get it to restart?

4.111 gears with 33's

 

[franklin40]

no it'll fire right up again by just turning the key. sputters a little then right back to running normal

 

[roscoFJ73]

Did you modify or swap anything in the fuel pick up at the tank? The fuel pick up should draw fuel until its empty and there should be enough fuel in the lines and filter to run for 10 minutes.
4.11 diffs are the best all rounder the H55F.

 

[dawery]

Check the inside of the fuel tank. In an 80, (sorry not sure about the 60) the pickup sits in a rectangular box which is like another baffle. Sorry I don't know the technical term, but mine dislodged from the tank itself and when I turned right like you are saying, the baffle would slide left and block the fuel pickup pipe (there was also supposed to be a strainer on the end of the pipe which had also fallen off). When I straightened up it would fall back off the pipe allowing fuel in again. Have a look mate it might be a similar scenario.

 

[franklin40]

tank was replaced with a good quality hj60 tank. the 3fe has a larger hole for the efi sending unit. was all cleaned out prior to install. otherwise exactly the same tank. I have a few other ideas I'm going to look into before dropping the tank. it was installed by hilltop cruisers and he said the tank was in perfect shape and really clean inside. the filter is a temp filter just to get me on the road and is smaller than the real one. it might be that. just weird it's only turning right. going right on city blocks doesn't cause it. just long sweeping corners

out of curiosity what does your 80 rev at highway speed? 100kph.

 

[cruisermatt]

In my experience with diff gearing a far as a 1HZ goes it really depends on what you want, if you want it to be good on the highway I'd do 3.73's, if you want it to be better off road then 4.11's or 4.56's. No matter what you do you will have a very well rounded truck.

If it was MY truck I'd install a set of those new 3.54:1 diff gears and a set of AA 4:1 transfer case gears to make up for the lost low-range.

 

[franklin40]

this is designed for more of an adventure vehicle. no hard wheeling. that'll be what my 40 is for. I'm seriously considering the 3:7 for towing reasons on 4th. I'll have lots of power with upgrade turbo etc

 

[roscoFJ73]

out of curiosity what does your 80 rev at highway speed? 100kph.

I don't have an 80 series but my 75 series has 4.11 ,H55F and a 1HZ. Ill try and remember to have a look on the freeway later.I seem to think it does 2450 at 110kph in 5th gear and 2100 in 4th. But I would have to check to be sure.

 

[IanB]

I don't have an 80 series but my 75 series has 4.11 ,H55F and a 1HZ. Ill try and remember to have a look on the freeway later.I seem to think it does 2450 at 110kph in 5th gear and 2100 in 4th. But I would have to check to be sure.

That's either backwards, or wrong, lol.

 

[GM60]

Your fuel delivery hose and the return line hose might be swapped over where they connect to the tank.
Your engine might be trying to draw fuel from the return pipe which might be positioned higher inside the tank than the delivery pipe.
Check that the hoses are correctly orientated.
Just a thought. Best of luck.

 

[beaas]

A factory manual euro hdj 80 has 2200 rpm in 100 km/h (true speed with factory tires are about 95). All of them have 3,73 axles.

 

[franklin40]

thanks for your help guys. i'll let you know if i figure anything out. I'm out of country for the rest of the week so it won't be till next week that i can dig into it a little more.

 

[roscoFJ73]

I checked mine this morning. I know the speedo is accurate because I tested it for an extended time with a GPS. I got 2180rpm in fifth at 100kph and 2900 in fourth at 100kph

 

[roscoFJ73]

That's either backwards, or wrong, lol.

Don't know what I did there , 4th should be 2900. I think I took 100 off 3000 and come up with 2100.

 

[Tapage]

in my 80 with 315 I'm about 2K at 100km/h give or take .. 4.10 stock R&P sometimes miss and extra shift 6th gear ..? but I'll never will go under 4.10

 

[mudgudgeon]

I checked mine this morning. I know the speedo is accurate because I tested it for an extended time with a GPS. I got 2180rpm in fifth at 100kph and 2900 in fourth at 100kph

At 2180rpm, you'd be very close to shifting down for any sort of hill.
Going with taller ratios than 4.11 will comprise your economy and towing capability IMO.

1hd-t is happy enough to rev if you can cope with the noise.
You want to cruise at around 2250 rpm IMO. Gives room to cope with a bit of a hill, gives you good pickup/response of you want to overtake, and plenty left in reserve if you want to stretch it's legs.
Get cruising revs too low, you'll be in fourth more often and your economy will suffer.

 

[roscoFJ73]

At 2180rpm, you'd be very close to shifting down for any sort of hill.
Going with taller ratios than 4.11 will comprise your economy and towing capability IMO.
.

Well its pretty flat around here . But gentle hills don't require a downshift without a load on.

 

[franklin40]

with 4:11 in 4th for towing at 100kph it be reving at 2700 rpm. with 3:70 I'd be at 2400. however with 3:70 in fifth I'd be around 1900 and just over 2100 with 4:11. 4:11 seems like too steep to maintain Hwy speed in 4th

 

[mudgudgeon]

with 4:11 in 4th for towing at 100kph it be reving at 2700 rpm. with 3:70 I'd be at 2400. however with 3:70 in fifth I'd be around 1900 and just over 2100 with 4:11. 4:11 seems like too steep to maintain Hwy speed in 4th

Your engine and economy would be happier with the revs you quote for 4.11 IMO.

The difference in RPM you quote is similar to swapping standard tyres to 35" an instant final drive ratios change of about 12%, enough to shift RPM outside of the sweet spot. Change final drive ratio and you lose an equivalent percentage of torque at any given RPM. Your 2400 rpm @ 100kph is approx 12% lower RPM, but you also have 12% lower torque, leaves 12% less grunt in reserve.
Yes, the 1hd-t has enough grunt to cope with this, but it will noticeably impact the drive-ability of the car.
Try and borrow a set of 35s to test the effect of the gearing change.