Unlocated noise from Avensis 1.8

[Mats Turret]

Hi all members! 

I have little but annoying problem with my Avensis. It makes howling from somewhere in front, it can be heard only when you drive 1500-2500rpm and when throttle pedal is raised. It doesnt happen any specific gear only when revs are on area mentioned before. I checkd alternator & AC comp. and logged all values with Techstream and noise source isnt there, I think its clutch or inner transaxle bearing. Clutch pedal works and feels right. Car is manual stick and 6 speed and 1.8 valvematic tuned to 185hp with 150k km mileage. I work with Toyotas on my day job and tune them but this issue is strange. It has been there for a while, before i tuned it. 

Someone got similiar problem? 

Thank you for help in advance! 

[Heidfirst]

It's hard to say without hearing what you are hearing. However, in the diesels it's not uncommon to get a noise roughly in those rpms caused by the foam seals on the air intake hose becoming perished & allowing resonance/vibration.

Out of interest what have you done to achieve 185bhp from the normally 147bhp 1.8 Valvematic?

[Mats Turret]

I think it must be a some bearing is wearing off, have to take it to long term inspection soon but noise is coming only when i stop accelerating.. I think i rip off axles from it and check.

Remapping ecu and i put rev limit is now on 8000rpm (7800 in program), lambda rates and heat are normal. There is a thought if i add compressor in it sometime in future but i think its easier to get 2.0T next. This tune is now on "beta" so we can see how engine handle this on long time period. This is my job to research different Toyota variants and see how to tune them. D4D are solved far as GD-FTVs (2.4 and 2.8 adblue) so this valvematic is next, because of valve timing and lift like VVT-L in T-sports. We tune all kind of engines from harvesters to jet skies.. If you are interested more about this just ask, i try to answer best i can.. :)

[Heidfirst]

no exhaust or inlet airflow modifications, purely a remap?

[Mats Turret]

No needed in this, only program change to ecu, intake & outlet is more than enough sized, cat is almost meter long, as i mentioned TIS log shows lambda rates are nominal. This tune is so called stg.2 more than usual. I think normal tune stays on 7500 rpm. This is the valvematic benefits because lift can be adjusted too. Normal dual vvt gain is almost zero if modification arent done, only racing car etc usable area. I can post dyno charts when 5000k test is over. Oil quality and change periods are more than crucial in this case. This is why we test new comers at least 2 months/+5000k km. 

[Konrad C]

8 minutes ago, Konrad C said:

 

If a car has a known running issue and Toyota are aware, the car has an ECU update. This means there is a way to alter the parameters. 

https://www.toyota-tech.eu/GTS/Wizard/ecu.aspx

So I can assume that Matti has got hold of the official equipment, or found a way to get into the ECU or made a physical alteration to make the changes.

It takes someone with great understanding of circuit boards, plus access to the right equipment to do these things.

Question to Matti- 135 Kw 1.8 Valvematic Avensis. That is 180 BHP! How was this achieved, and was forced induction used?

Personally I am happy with my 'standard' car, and don't want to add any more stress to the car. 

How much does all this cost?  

 

2 hours ago, Mats Turret said:

No needed in this, only program change to ecu, intake & outlet is more than enough sized, cat is almost meter long, as i mentioned TIS log shows lambda rates are nominal. This tune is so called stg.2 more than usual. I think normal tune stays on 7500 rpm. This is the valvematic benefits because lift can be adjusted too. Normal dual vvt gain is almost zero if modification arent done, only racing car etc usable area. I can post dyno charts when 5000k test is over. Oil quality and change periods are more than crucial in this case. This is why we test new comers at least 2 months/+5000k km. 

You have answered my question in another post. Did you swap the chip or changed the values. What effect has this with drive-ability, and fuel economy? 

[Konrad C]

17 hours ago, Mats Turret said:

I think it must be a some bearing is wearing off, have to take it to long term inspection soon but noise is coming only when i stop accelerating.. I think i rip off axles from it and check.

Remapping ecu and i put rev limit is now on 8000rpm (7800 in program), lambda rates and heat are normal. There is a thought if i add compressor in it sometime in future but i think its easier to get 2.0T next. This tune is now on "beta" so we can see how engine handle this on long time period. This is my job to research different Toyota variants and see how to tune them. D4D are solved far as GD-FTVs (2.4 and 2.8 adblue) so this valvematic is next, because of valve timing and lift like VVT-L in T-sports. We tune all kind of engines from harvesters to jet skies.. If you are interested more about this just ask, i try to answer best i can.. :)

 

13 hours ago, Heidfirst said:

no exhaust or inlet airflow modifications, purely a remap?

 

5 hours ago, Mats Turret said:

No needed in this, only program change to ecu, intake & outlet is more than enough sized, cat is almost meter long, as i mentioned TIS log shows lambda rates are nominal. This tune is so called stg.2 more than usual. I think normal tune stays on 7500 rpm. This is the valvematic benefits because lift can be adjusted too. Normal dual vvt gain is almost zero if modification arent done, only racing car etc usable area. I can post dyno charts when 5000k test is over. Oil quality and change periods are more than crucial in this case. This is why we test new comers at least 2 months/+5000k km. 

First of all Matti, I would go with the clutch and or input shaft bearing. Whilst stationary, h ave you tried the affected revs with the clutch depressed and is there any difference? Also if you do dismantle the transmission, can you take some photos it will be interesting. 

As for your ECU update, you state that you raised the rev limiter to 8000 rpm. I would rather leave the limit and increase the torque at lower down the rev range. What is the torque curve compared to standard?

Matti, you are aware that Lotus has been using the Valvematic engine.  

[Mats Turret]

I explain little differently how we tuned this Avensis, this concerns only non turbo petrol valvematic engine: 

i strip ecu off from engine compartment, under airfilter, then i open plastic case and remove PCB, i solder couple wires and pad in it, then i read program with my tool and started edit it with editor, when its made i calculate checksum and write it back to ecu PCB. Then little glue and back where it was, then i make couple adjustments with techstream diag to make engine run properly idle and check values with new calibration.

I refer later Low 0-3000rpm Med 3000-5000 and High 5000>rpm area.

In this case we have modified only high area map and them on 70%> 100% load value. 

So when you dont push pedal to the metal, engine is stock, it works all around same settings that factory has written on ecu, only when you push gas pedal to the floor the map takes full load map in use, then injection values and timings change and valve lift is opened more, engine is almost same as BMW valvetronic, there is no intake manifold flaps so it gives more space to adjust engine, especially on high revs.

We have no reason to manipulate Low or Med map because there is no turbo which can push more air in engine, Toyota engineer has make it good as it can be. So overall consumption and emissions are exactly same than normal tune. This tune gives only more power in reserve when its needed and remembering this aint Hiace either. If i bypass truck it just happens quicker.

This tune has no mind at all if that thinks with reason but if car goes faster and give little extra kick, why not?

This car is my hobby, turbo petrols & diesels are my full time job.

And im not working in Toyota, we are independent optimization company group.

 

I take lots of photos when i put my avensis on dock, i called to Toyota service and they said its not so dangerous but expensive to locate. So i start this inspection without any clue. :D I check that gearbox line to tire and change all bearings what i can do. Maybe i dont open box itself. I have opened new topic for toyo tuners because this went off topic so finely.. :D Ty guys!