1997 v70r if i (accelerate)hard it loses power

[chuffin hell]

Hi update
Fuel pressure 2.2 bar on tick over
When accelerated it goes 2.8 then drops back to 2 ish
Wen its starts stuttering its at 2ish pressure

[FLXC90]

could a partially obstructed exhaust system cause air to "stack" and maybe do this?
You say the turbo is new-is it the same wheels and housing refreshed with new seals and bearings, or is it a replacement that may be trimmed wrong?
And is it the same turbo that your car is tuned for?

[chuffin hell]

Also wen I take off the vacuum pipe to pressure regulator valve from inlet manifold it goes to 3 bar fuel pressure

[chuffin hell]

Hi turbo not new
But am sure on earlier post I should run at 3bar at least

[chuffin hell]

Is the fuel pump serviceable ?

[chuffin hell]

Well I'm getting no where all new parts fitted and it doesn't bog down no more but hesitates n hold back full power am still only gettin 2.4 bar at rail but I've changed pump and pressure valve and pipes so ecu next port of call I guess

[chuffin hell]

Ecu not next port of call sorry a quick thought is maybe my new pump is faulty
Anyone know how to check separate from car for pressure?

[scot850]

Hi Adam,

I guess you know you should be getting at least 3bar pressure at rail. Not convinced dealer got it right when they measured mine as they said it was running 4 bar.

There is a fuel pressure regulator, but I'd need to see where it is on a 98. On the 2000 it is on top of the fuels tank on the RHS just in front of the right rear wheel. Small silver can with an input and output. Mounts on top of a block that the main fuel pipe runs through.

Fuel tank RH side

The small silver can is about half way up photo with a red tape flag to the right of it.

Had a quick look at Vida and it isn't helpful showing where it is fitted, but I think it is in the engine compartment. Maybe someone with a 98 can advise. There is also a 2nd pressure regulator under the fuel rail. There appears to be 2 types depending on the engine fitted.

There is another question. Did you uprate the injectors for the fuel rate you will need? If not the standard ones may not be sufficient for the flow rate.

Neil.

[chuffin hell]

Hi Neil
Its by steering rack on mine I've replaced it there's one under rail but its pulse

[scot850]

Well they should be good. Couple of questions. When you say you replaced parts, do you use new OE parts, New Aftermarket or used? Volvos are particular and sometimes aftermarket parts are just no good, and of course, used can be a lottery sometimes.

A couple of questions for you.

You have had the engine software chipped or modified to get greater power, but you never said who supplied it. I would expect the supplier to be able to advise you on the requirements for the engine to be able to produce it. If it is claimed to produce 340bhp, then you are very un-likely to produce that with standard parts as I have previously said. My car is running a supposed 312 bhp and 300ft/lb on Rica software, but the 2000 year I believe already had bigger injectors, and I have had to upgrade the TCV to cope, and if I can be bothered, I will eventually upgrade the CBV with the IPD HD unit. Unfortunately the T19 needs to be removed to replace the CBV.

Neil.