100 series suspension question

[RichardfromWinder]

Good evening
I have two 100 series cruisers, a 53 and 54 plate.Bought my first GX, (rotted to death) 25 years ago. Love the amazons with a passion
I’ve converted my 53 to full peddars suspension and nolly bushes all round. Just a beast of epic proportions. Even does corners at speed, and doesn’t acknowledge potholes!!!
But my 54 plate ( recently acquired) is totally standard. And to be frank a minter.
But
She has a slight lean of about 20mm towards the drivers side( without the large driver)
Do I tweak the torsion bars a bit?
Alter the ride height adjusters on the sensors??
A bit of both??
I thought I knew these cars inside out, but don’t want to spoil a beauty.
Many thanks for your input
Richard

 

[GTV]

Welcome!
Most of us are Yanks and haven’t a clue what a 53/54 plate means.

Search for the ABCs of AHC thread, it will help you dial in your suspension.

 

[Unrulykid]

Good evening
I have two 100 series cruisers, a 53 and 54 plate.Bought my first GX, (rotted to death) 25 years ago. Love the amazons with a passion
I’ve converted my 53 to full peddars suspension and nolly bushes all round. Just a beast of epic proportions. Even does corners at speed, and doesn’t acknowledge potholes!!!
But my 54 plate ( recently acquired) is totally standard. And to be frank a minter.
But
She has a slight lean of about 20mm towards the drivers side( without the large driver)
Do I tweak the torsion bars a bit?
Alter the ride height adjusters on the sensors??
A bit of both??
I thought I knew these cars inside out, but don’t want to spoil a beauty.
Many thanks for your input
Richard

Neutral pressure is the pressure of the AHC system at each wheel in the N position setting on AHC. The AHC system is designed to carry a certain load while the torsion bars in the front / coils in the rear pick up the remainder of the weight.

The spec for AHC pressure measured with Tech Stream is 6.9 +/- 0.5 MPa and rear is 5.6-6.7 MPa. The aging of the vehicle could have softened the rear coils and the torsion bars.

As I understand it, the order of operation is;
Adjust AHC front sensors individually to set the left to right level on the vehicle. Then, same for the rear sensor to set front to rear rake. Front should be at least 1” lower than rear, or the vehicle will wander left to right driving down the road. Do this in N position on AHC. Then adjust torsion bars to set AHC pressures within spec. Verify pressures using Tech Stream.

At this point, if you have trouble getting the spec pressures at the set and level height of the vehicle, your rear coils and/or torsion bars may have relaxed tension. May look to replace them as needed. Height and tension of the rear springs will determine how much load the carry. Consider new rear coils, or coil spacers… or both. This will take some weight off the AHC and put the weight back onto the springs in effort to balance rear neutral AHC pressure.

 

[RichardfromWinder]

Neutral pressure is the pressure of the AHC system at each wheel in the N position setting on AHC. The AHC system is designed to carry a certain load while the torsion bars in the front / coils in the rear pick up the remainder of the weight.

The spec for AHC pressure measured with Tech Stream is 6.9 +/- 0.5 MPa and rear is 5.6-6.7 MPa. The aging of the vehicle could have softened the rear coils and the torsion bars.

As I understand it, the order of operation is;
Adjust AHC front sensors individually to set the left to right level on the vehicle. Then, same for the rear sensor to set front to rear rake. Front should be at least 1” lower than rear, or the vehicle will wander left to right driving down the road. Do this in N position on AHC. Then adjust torsion bars to set AHC pressures within spec. Verify pressures using Tech Stream.

At this point, if you have trouble getting the spec pressures at the set and level height of the vehicle, your rear coils and/or torsion bars may have relaxed tension. May look to replace them as needed. Height and tension of the rear springs will determine how much load the carry. Consider new rear coils, or coil spacers… or both. This will take some weight off the AHC and put the weight back onto the springs in effort to balance rear neutral AHC pressure.

Many thanks for the replies, I have a snap on solus diagnostic tool, but it doesn’t read suspension settings on a Land Cruiser. Which is a pain, it does on our other cars.

 

[uHu]

As said above, you really need to read through the The ABCs of AHC thread. The answers to all your questions are there, and quite a few extra as well.

But, basically, as a start: You tighten the torsion bar on the low side, until level. Then you need a M-OBD reader to find the AHC pressures, and height readings - that's a requirement for a good working, and lasting, suspension. The easiest way to read the AHC values is normally to get a Mini-VCI interface with TechStream software, unless you have an old T0yota Tester.
Start reading !

 

[CanuckS100]

As said above, you really need to read through the The ABCs of AHC thread. The answers to all your questions are there, and quite a few extra as well.

But, basically, as a start: You tighten the torsion bar on the low side, until level. Then you need a M-OBD reader to find the AHC pressures, and height readings - that's a requirement for a good working, and lasting, suspension. The easiest way to read the AHC values is normally to get a Mini-VCI interface with TechStream software, unless you have an old T0yota Tester.
Start reading !

Jumping in here. I am having trouble finding a reliable TechStream download source and the ones I find don't work. I need to read by AHC Pressures as I just put in new globes and bled twice, and the ride is actually undriveable. I believe I now have to adjust the torsion bars, but need to read the values. Any thoughts?

 

[RichardfromWinder]

Neutral pressure is the pressure of the AHC system at each wheel in the N position setting on AHC. The AHC system is designed to carry a certain load while the torsion bars in the front / coils in the rear pick up the remainder of the weight.

The spec for AHC pressure measured with Tech Stream is 6.9 +/- 0.5 MPa and rear is 5.6-6.7 MPa. The aging of the vehicle could have softened the rear coils and the torsion bars.

As I understand it, the order of operation is;
Adjust AHC front sensors individually to set the left to right level on the vehicle. Then, same for the rear sensor to set front to rear rake. Front should be at least 1” lower than rear, or the vehicle will wander left to right driving down the road. Do this in N position on AHC. Then adjust torsion bars to set AHC pressures within spec. Verify pressures using Tech Stream.

At this point, if you have trouble getting the spec pressures at the set and level height of the vehicle, your rear coils and/or torsion bars may have relaxed tension. May look to replace them as needed. Height and tension of the rear springs will determine how much load the carry. Consider new rear coils, or coil spacers… or both. This will take some weight off the AHC and put the weight back onto the springs in effort to balance rear neutral AHC pressure.

Hello again. Many thanks for your replies. I have another question. On my 2004 Amazon, which is a 5 speed, it seems to hang on to 4th gear and take ages to change into 5th.the only way to keep the gear changes tighter, is to keep the revs down. Has anyone seen this before or is it just as they are.
Cheers Richard

 

[uHu]

Depends.
... e.g. on temperature, and provided fluid level within specs.
Might be the way it is, hard to say from a few words. Are you mixing up 4th-to-5th with Lock-Up (LU) of the converter?
You should be able to go into top gear with LU at over 60 km/h on a completely flat road, or into 4th with LU. If you keep it in 4, it should go into LU easier than if you put in in D.
(LU available only in 5th and 4th on the 5-speed. In 4th only on the older 4-speed)

LU is not enabled until engine and gearbox are at operating temperature. (Was it 60 C?)

There is also an automatic downshift if going downhill with light brakes applied.

Saying "2004 Amazon" is inaccurate. It depends on month and year of production. For your car, the changes happened in july/aug 2003 and july/aug 2004.
Mine is a 07/2004 HDJ100L, and could be sold as either a 2004 or a 2005, depending of the policies of the dealer/importer.

 

[Unrulykid]

Hello again. Many thanks for your replies. I have another question. On my 2004 Amazon, which is a 5 speed, it seems to hang on to 4th gear and take ages to change into 5th.the only way to keep the gear changes tighter, is to keep the revs down. Has anyone seen this before or is it just as they are.
Cheers Richard

Read through this thread for clues… it may help you figure it out.

Long thread but lots covered.

Spoiler alert… for the OP, it was a wire harness issue. Issue resolution begins on page 17 of the thread.

Thread '5-speed A750 trans won't shift in to 5th gear.'

Oct 7, 2024

Looking to see if anyone else has experienced this, as I couldn't find much for what's going on.

2005 LX470, 345-350k miles. Trans has been perfect as long as I've owned the truck, nary a hiccup ever. I last drove the truck on Saturday this past weekend, all is great. Today, the ABS/VSC/TRAC lights came on the dash, and the transmission will no longer shift in to 5th gear. I did a key cycle and the idiot lights are now gone, didn't come back in about 50 miles of driving home. But, trans still won't shift in to 5th. All other gears, reverse included, are just fine. What's interesting is...

• MongooseGA
• Replies: 376
• Forum: 100-Series Cruisers