Any idea where my powers gone ?

**960kg** · Sunday 9th February 2014, 18:56

Originally Posted by V70 Graham

For those of you who were at the RR day yesterday you would have seen my car embarrass itself and post a very low 253.0 bhp

This time last year it was a whole 4.1 bhp more and since then I have a new RICA 310 map a Forge recirc valve and Volvo TCV amongst other things.

The car now has a fair bit more torque 311.9 ft/lb compared to 274.0 ft/lb and drives well on the road, but.....as you can see from the graphs below this years has a dip around 3300 rpm which for those who weren't there yesterday was accompanied by 'chattering' sound.

Do any of you have any idea where I should be looking, maybe a new Forge actuator is on the cards as it's never been changed and I've been told the diaphragm can go in these, along with maybe an IPD TCV, anyone use these items ?

Forge Recirculating Valves have different springs colours according to the boost required the same as in the Forge Actuator.

But of course the Recirc valve is a piston type......I have one fitted but with a Yellow spring ....perhaps you have the Red standard one fitted which will make the known chatter earlier?

**V70 Graham** · Sunday 9th February 2014, 19:03

Originally Posted by 960kg

Forge Recirculating Valves have different springs colours according to the boost required the same as in the Forge Actuator.

But of course the Recirc valve is a piston type......I have one fitted but with a Yellow spring ....perhaps you have the Red standard one fitted which will make the known chatter earlier?

Nope, it's deffo the Yellow spring fitted.

**Jamest5r** · Sunday 9th February 2014, 19:47

How can you have a thread title where's my power gone when you've got nearly 40lb more Torques?? Torque is what pulls you down the road like a stabbed rat forget the bhp its good enough, if it drives smoothly on the road leave it as it is if your not happy spend money

**Santa** · Sunday 9th February 2014, 19:54

Originally Posted by Jamest5r

How can you have a thread title where's my power gone when you've got nearly 40lb more Torques?? Torque is what pulls you down the road like a stabbed rat forget the bhp its good enough, if it drives smoothly on the road leave it as it is if your not happy spend money

But if you look at the graph the torque doesnt hold for as long and the graph is a bit wavey

**Jamest5r** · Sunday 9th February 2014, 19:57

Originally Posted by Santa

But if you look at the graph the torque doesnt hold for as long and the graph is a bit wavey

It's all about how it is on the road, if it's better than before happy days if not spend money lol

**Santa** · Sunday 9th February 2014, 19:58

Originally Posted by Jamest5r

It's all about how it is on the road, if it's better than before happy days if not spend money lol

Can agree with that, rolling road results arent everything.

**V70 Graham** · Sunday 9th February 2014, 20:03

Originally Posted by Jamest5r

It's all about how it is on the road, if it's better than before happy days if not spend money lol

Originally Posted by Santa

Can agree with that, rolling road results arent everything.

It is good on the road, but I think it could be better.

**Santa** · Sunday 9th February 2014, 21:09

Originally Posted by V70 Graham

It is good on the road, but I think it could be better.

Slippy slope that lol

**t5 pete** · Sunday 9th February 2014, 21:12

Originally Posted by V70 Graham

It is good on the road, but I think it could be better.

Oh dear I think you know what happens next lol

**Jamest5r** · Sunday 9th February 2014, 21:13

Originally Posted by V70 Graham

It is good on the road, but I think it could be better.

Maybe your 310 map would work better with an after market exhaust

**stribo** · Sunday 9th February 2014, 21:13

Originally Posted by Santa

Slippy slope that lol

Originally Posted by t5 pete

Oh dear I think you know what happens next lol

He's not allowed to spend any money on the car after the exhaust debacle.

**merc85** · Sunday 9th February 2014, 22:54

Originally Posted by Santa

Slippy slope that lol

lol yeah i know that one

**M-R-P** · Monday 10th February 2014, 17:08

Here's the uncut video of Graham's car on the rollers. When you hear the TCV start chattering, you can actually see the front of the car drop down a bit, showing the sudden loss of power.

**V70 Graham** · Monday 10th February 2014, 21:34

What do we recon then.....TCV ?

**stribo** · Monday 10th February 2014, 21:40

Scrap it, and buy a C70.

In all seriousness mate, fit (sorry, get Martin to fit) a bloody boost guage, without that you have no idea what's going on.

**JUDGENINJA** · Monday 10th February 2014, 21:41

Get it changed and we'll go back. I need to run the V40.

**AndysR** · Monday 10th February 2014, 21:53

FWIW the noise you can hear is the wastegate releasing causing a drop in boost, this is happening for 1 of 2 reasons.
1, The management is telling it to do so via the BCS because it's protecting something/controlling a boost spike.
2, There is a mechanical fault with the actuator, the turbo, the recirc valve or an electrical fault with the BCS.

Personally I'd check the operation and adjustments of the wastegate actuator. If the arm is too tight then it maybe boost spiking initially and the management system is therefore detecting a boost spike causing the boost to be bled off as it initially spikes and then holding the boost levels back to protect the engine.
If the actuator is weak or has a split diaphragm then I certainly wouldn't fit anything other than a standard new Volvo/Mitsubishi supplied actuator for a stage 1 car. Unlike the aftermarket items with interchangeable springs these actuators are a sealed unit and due to this design cannot suffer with air leaks to the same level as the actuators which have interchangeable springs and therefore give more consistency in operation and help to avoid boost loss and or spikes.

Another thing you could try for testing purposes if you have access to one is a blanking plate to replace the recirc valve, it maybe that the Forge one you have isn't any good for your current set up. The BCS or TCV would probably be the last thing I tried as you've already renewed this recently with a new one, agreed this chattering noise has only occurred since you fitted it but I suspect that's more because it's highlighted a fault elsewhere rather than occurred as a result of a faulty new BCS.

I suspect your problem is rather minor and will be easy to resolve with the right time and knowledge applied as the car runs too well everywhere else to be a significant fault

**V70 Graham** · Monday 10th February 2014, 21:58

Recirc valve was changed at the same time as the TCV, hope it's not that, haven't got the old one now !

**stribo** · Monday 10th February 2014, 22:13

Originally Posted by V70 Graham

Recirc valve was changed at the same time as the TCV, hope it's not that, haven't got the old one now !

I've got a spare if needs be.

**AndysR** · Monday 10th February 2014, 22:13

Originally Posted by V70 Graham

Recirc valve was changed at the same time as the TCV, hope it's not that, haven't got the old one now !

Oh... I've just seen that you fitted a Forge one, even if the fault isn't the recirc valve personally I'd get a genuine one and use the Forge one as a paper weight ...