New Turbo = Slower Car

[k690bpp]

i've had a new turbo fitted as the old one was buggered, its the exact same model as the old one (16t) but the car seems to be running alot slower.

would a badly adjusted actuator cause this??? i assume it would of been adjusted beforehand but just in case it hasn't been done properly i'm going to check it my self but i need to know what pressure it should be set too, any ideas???

vadis says 30kpa (approx 4.5psi) but this seems alittle low.

thanks.

[Wobbly Dave]

It is not true - even the new ones out of the box from Volvo need checking and setting up first. 4.5psi is indeed the factory setting. The whole point of running on lower boost (not actual turbo pressure) is that it is easier for the ECU to control/fine tune when it comes to making the wastegate move (via the BCS)

[volvotuning]

4.5 psi is about right for that turbo. Is it a new turbo? Assuming the turbo is good, is everything else connected properly?

Adam.

[madness]

we very often see this happening. The old unit can be overboosting when it is about to go givivng a bit better performance and when the new unit goes on performance goes back to normal.
assuming as everybody else said everything on the car is running ok.

[k690bpp]

we very often see this happening. The old unit can be overboosting when it is about to go givivng a bit better performance and when the new unit goes on performance goes back to normal.
assuming as everybody else said everything on the car is running ok.

the new one was put on to stop the car smoking but its still doing it and infact there was nothing wrong with the old turbo, the problem lies elsewhere. its booked in to be further diagnosed next week.

[TangoDeltaSierra3]

the new one was put on to stop the car smoking but its still doing it and infact there was nothing wrong with the old turbo, the problem lies elsewhere. its booked in to be further diagnosed next week.

Are u taking it to VolvoTuning then ? You cud upgrade yer Monroes too if you do.

[k690bpp]

Are u taking it to VolvoTuning then ? You cud upgrade yer Monroes too if you do.

yep i am but i've already done the monroes and eibachs, my brother and me did them last weekend ourselves in 3 hours - very easy and straight forward job.

i would go back to sw autos (they fitted the new turbo) as they are very, very good but stuart won't be in for a while due to family sickness and i really can't have it smoking until he does.

i'm really going to vt to have the hybrid upgrade done, if adam can stop it smoking first...fingers crossed.

[Al115]

Who diagnosed the turbo as causing the smoking? Are they going to stand you the cost of the replacement?!? It's a bloody expensive bit of kit to replace and then find it's not the problem!

[k690bpp]

the car first went to my local dealer who said it was 50-50 the stem seals or the turbo, i went with turbo and it was replaced under warranty by stuart@sw autos and cost me nothing.

unfortunately its still smoking and so i'm going to see adam@vt mainly to sort of a hybrid upgrade but first he'll have to sort the smoking.

i did have a compression test done and these were the results:

cylinder 1: 13bar
cylinder 2: 13bar
cylinder 3: 12bar
cylinder 4: 13bar
cylinder 5: 13bar

now i know what your thinking is that it must be cylinder 3 thats bad but according to vadis a reading of between 11-13 bar is ok and a difference of 2 bar between cylinders is fine.

so it seems as though the compression is ok, any other ideas???

[Al115]

Interesting... those compressions seem fine to me. Any ideas chaps?

[k690bpp]

evap canister???

[Rooster]

Or an inticooler still full of oil from old turbo

[splatt]

Or an inticooler still full of oil from old turbo

most likely IMO. had this on a previous car...

[k690bpp]

does it have a drain hole in the bottom???

[Justin]

Yeah they all do

[Al115]

Although worth checking because some seem to collect self-tapping screws! I suppose that's OK if you are 100% sure that your turbo isn't passing any oil...

[spesh]

Dont sound like the valve stem oil seals as it will only smoke on start up for a few secs, are the turbo's brand spanking new or new recons? There is the unliky chance of a duff one maybe? If it was only under hard driving piston wash would be another idea!

[k690bpp]

Yeah they all do

where and how do i drain it???

Dont sound like the valve stem oil seals as it will only smoke on start up for a few secs, are the turbo's brand spanking new or new recons? There is the unliky chance of a duff one maybe? If it was only under hard driving piston wash would be another idea!

it doesn't smoke at all on cold/hot starts or while idling but only if left idling for around 5 mins then revved. the turbo was a brand new volvo 16t (not recon) and it was fitted very carefully by a trustworthy mechanic so i don't think the problem lies there but like you say there could be a unlikely chance. very unlikely because i saw the old turbo after it was taken off and the exhaust side showed no sign of oil but the inlet side was very slightly covered in oil but nothing abnormal.

there no smoke while driving at all, even when in looney mode.

btw whats piston wash???

[spesh]

Sound like the oil breathing system, have you giving it a once over??
Piston wash, when to much fuel is injected it seeps past the rings and slowly breaks down the tight seal that stops oil from passing the rings, therfore oil seeps past the rings, but still holds good compression. Well in a nut shell

[k690bpp]

Sound like the oil breathing system, have you giving it a once over??
Piston wash, when to much fuel is injected it seeps past the rings and slowly breaks down the tight seal that stops oil from passing the rings, therfore oil seeps past the rings, but still holds good compression. Well in a nut shell

when the dealer looked at it they said it was breathing fine but what can i do myself to check the system???

i did pull out the oil dip stick and took the oil cap off after a long run and no smoke came out of either hole.

how likely is piston wash???

thanks.