AHC data through techstream

[Vampo]

Hi ,

I posted a few times on this forum about my AHC. Never ended up completely fixing the problem. Today after a long time I decided to connect my techstream to my rig and read the data, as I put on a new set of Bridgestone Duelers 75/55R20 about 2 weeks ago.

I found the vehicle to be extremely stiff over speed bumps (it actually make a loud thud sound when going over bumps) and I also felt that it was not very stable when cornering.

When I went through the readings, what I found was that Toyota!!!! (who last adjusted my suspension) had adjusted the TB's so much that my neutral pressure was Front - 5.5 MPa / Rear 5.0.

No wonder I had this bad ride experience, I guess i was living on the TBs.

So after many hours of adjustments, I managed to get my neutral pressure to the spec. however the height sensors seem to be out of spec (I just cant get them near 0) does this matter?

Also my rig height (hub center to Fender is - Front 20.2', Rear 20.8'). and I tried every trick I know to bring down the front to sub 20, but no luck. Is this normal ? or am I doing something wrong.

I've attached my teachstream data for reference.

Really appreciate any help on this.

 

[PADDO]

At those low pressures you were riding on springs - the damping system just doesn't function when it's that far out of balance. But this you know

A couple of mm delta in the front height sensors isn't a problem, you have +- 10mm variance before it presents problems. Your're not that far above stock height and you have good neutral pressures so you really don't need to lower unless you want too. Have you followed the fsm (I've posted it a few times in pdf) to lower height?
You've got a dtc being reported too.

 

[Vampo]

Hi PADDO,

Thanks for you quick response. I didn't follow the PDF you are referring to. I'll find it on the forum and cross check against what I did. hopefully not much different.

If you think the suspension is within acceptable spec, I'll just use it like this for sometime and recheck the readings in a week.

Just took the rig out for a spin, and man there is a difference in handling. it doesn't feel like its going to topple.

Anyway, I hope the suspension remains soft like this without suddenly becoming stiff like previously.

Just noticed a cluck sound from under the rig near the rear wheels when going on a rutty road, was wondering if this was related or just my brake pads / shoes moving about.