Not sure where to put this thread but very recently my turbo is making a whirring noise, it has been using a little oil but now makes a whirring noise only under load and get a louder the faster the turbo is spinning, I've ruled out gearbox and tensioners and pumps, I cleaned my turbo with Mr muscle to try and clean the vanes, but my guess is that I think it's related to the vanes, under part throttle the noise is there but very quiet under full throttle from around 2krpm to 3000k rpm it's loudest, or it could be the noise of sever overboost, I've put a standard map on to see if it was my VNT maps but my VNT maps were done well as I had only 1psi of overboost across the whole rev range, this file clearly makes the noise audible. Any help or guesses would be marvellous. Thanks everybody

walshy1 wrote:Not sure where to put this thread but very recently my turbo is making a whirring noise, it has been using a little oil but now makes a whirring noise only under load and get a louder the faster the turbo is spinning, I've ruled out gearbox and tensioners and pumps, I cleaned my turbo with Mr muscle to try and clean the vanes, but my guess is that I think it's related to the vanes, under part throttle the noise is there but very quiet under full throttle from around 2krpm to 3000k rpm it's loudest, or it could be the noise of sever overboost, I've put a standard map on to see if it was my VNT maps but my VNT maps were done well as I had only 1psi of overboost across the whole rev range, this file clearly makes the noise audible. Any help or guesses would be marvellous. Thanks everybody

Mr. Muscle won't solve anything, you need to take the turbo and get it to a proper house to do a full maintenance.
You probably have decalibrated turbo.

edit - by decalibrated I say that is spinning out of axis

Boiler thank you for commenting. I thought as much, the car did suffer a bad overboost, absolute pressure was maybe around 43 psia, well out of range I think for the gt1749v, the noise must be an aerodynamic one, so due to the overboost the compressor wheel is probably damaged and there is most likely play axially, I haven't checked yet but will do as soon as the rain goes away...

Out of curiosity, how much boost can the GT1749v support continually and momentarily thanks...

walshy1 wrote:Boiler thank you for commenting. I thought as much, the car did suffer a bad overboost, absolute pressure was maybe around 43 psia, well out of range I think for the gt1749v, the noise must be an aerodynamic one, so due to the overboost the compressor wheel is probably damaged and there is most likely play axially, I haven't checked yet but will do as soon as the rain goes away...

Out of curiosity, how much boost can the GT1749v support continually and momentarily thanks...

1.5bar is enough for 70mg IQ, if want more you need to change hardware

That's some good info, as a side note what standard boost pressure does 1.9 jtd/jtdm/cdti 16v engines use, and what is the max safe boost pressure for the turbo which I think is a gt1749v

Thanks

walshy1 wrote:That's some good info, as a side note what standard boost pressure does 1.9 jtd/jtdm/cdti 16v engines use, and what is the max safe boost pressure for the turbo which I think is a gt1749v

Thanks

I give you the answer above, 1.5bar is what you can squeeze from a 1749v. More will probably reduce turbo life!
About those engines, 1.9jtdm has 1749v, 1.9jtd has 1544s and 1.9cdti has 1749v. Pressures, I will guess 1.3/1.4 on those 1749v and 1.1/1.2 on the 1544s.

Awesome I heard of some people recently running 1.75 bar but I don't want my replacement turbo to blow when I put it on...

The stage 1 map I had used about 2450 mbar so I guess it was in range of the turbos capability, although I didn't have any smoke, I will raise boost to 2500mbar, but shall I raise injection quantity till I have a little smoke? You said 70mg is enough for 1.5 bar, if I have no smoke can I increase injected fuel slightly? Also do smoke maps play a big role? They seem to be unchanged even in stage 1 map

Thank you

1.75 on a 1749V is something really...maybe they are usin a 1749VB or even a 1756VK?

If you're aiming to some smoke you cannot increase boost! Do the calculations, but on a PD130 original max boost is 2350mbar wich will burn more or less 66/67mg of fuel without smoke. With 2500mbar boost you will burn 69/70mg of fuel without smoke.

Smoke maps are important, keep your tune smoke free and help on comsumption. Aim at 17:1 AFR or even 18:1, this is were power resides.

Tune like this, by highest to low values: Drivers Wish -> Smoke Limiter -> Torque Limiter (this is were or lowest value of IQ must be)
extend axis on smoke limiter to comply with desired IQ vs Boost
extend and calculate durations meet your max IQ of TL
extend and increase boost to accomodate cleanly IQ

example; I aim for 2.45bar, it will create 1164mg/st, using AFR of 18 can burn 65mg or AFR=17 burn 68,5mg. This gives you almost all info you need, you will need to calculate durations.

Only a quick example nothing scientific, anyway I don't know what car you drive so this is just for example!

It is a Fiat Bravo 1.9 16v 150hp jtdm. I will re write the map to how id like it to drive, my smoke maps in winols and ecm are in a table containing ones, not with my laptop at the moment so I'm not sure what the y and x axis are but most of the table is 1.00, am I correct in thinking that 1.00 in the smoke map is stoichometric or is it a lambda value?

Thanks

So you have a 1749MV, it can hold till 1.6/1.7 bar max.
I assume that is lambda value. Do your map and then share with the community, I'me sure that with everybody helping you'll get what you desire for a remap.