PDA

View Full Version : What A Dump!



CAMO
Thursday 16th December 2004, 21:26
I'm Concidering Fitting A Dump Valve To My 1996 850 T5. First Of All What Sort Is Best: Piston Or Diaphram? How Hard Is It To Fit One, And Are There Any Problems In Fitting/ Running/ Maintaining One Once Fitted? Suggestions Please!

Wobbly Dave
Friday 17th December 2004, 19:44
If you do fit one - then you will have to remove the recirc valve that is already on the turbo.

Personally - I wouldnt bother fitting an airleak to my car :shifty:

hamish
Saturday 18th December 2004, 02:54
camo,

Please don't do it ! I'm getting bored of removing those blanking plates that someone keeps selling ! They don't work and just cause problems. The volvo management system uses a MAF sensor to determine air taken in, and so a to atmosphere D.V. will ultimately confuse your ECU. They're alright on ancient history like: Renault 5, Escort / Sierra RS, 200SX etc. Fitting one, to a T5, usually end's up with a poor running issue ! Spend your money on making it fast not noisey !

Regards,
Hamish.

CAMO
Saturday 18th December 2004, 15:55
I Have Been Assured That By Fitting A Twin Piston Type Dump Valve, This Ensures That There Is No Running Problems, Idle/ Ecu Problems?

Pedro Fandango
Saturday 18th December 2004, 16:54
Bracers got a dump valve on his, where is he?

CAMO
Sunday 19th December 2004, 12:10
Wow, He Must Be Good On The Stop Watch, To Time 14.557 Seconds! And I Bet It's All Down To The Dump Valve Fitted!!!

Pedro Fandango
Sunday 19th December 2004, 12:35
Wow, He Must Be Good On The Stop Watch, To Time 14.557 Seconds! And I Bet It's All Down To The Dump Valve Fitted!!!
lol, it was timed at Santa pod. & i've still got the standard re-circ valve (for now :wink: )

CAMO
Sunday 19th December 2004, 20:07
Twin Piston Is The One To Go For!!

Bracer
Monday 20th December 2004, 10:50
Sorry it took me so long.

Well as Cov said, I have one and I have no problems, infact it cured my boost leak and my compressor stall as the stock CBV would leak under the boost levels I'm running and then did not flow enough to relieve the system of boost during gear changes and causes serious stall :mad:

You will require a "Double Piston" or an "Adjustable" one.

I personally prefer the Adjustable type as this allows you full control over the set-up and gives you a better range of valves to choose from !

Anyway the key to the system is a "MUST" fitting of a block off plate for the CBV. Dont be tempted to do the quick way of fitting a washer check valve in the Vac/Pressure line to the CBV and its just a Bodge way of doing this mod.

Anyway here’s some pics

http://memimage.cardomain.net/member_images/3/web/639000-639999/639353_17_full.jpg

http://memimage.cardomain.net/member_images/3/web/639000-639999/639353_18_full.jpg

See the Full step by step fitting here (http://www.imagestation.com/album/pictures.html?id=4287684357)

Any questions, please ask !

Regards

Steve

CAMO
Monday 20th December 2004, 18:43
mate, what is the cbv, and why do you need to blank it off. with the fitting kit that you get with these dump valves do they tell you to do this? i thought that the dump valve fits in place as shown on your photo, and the small pipe off the dump valve goes onto your engine block at the front?
sorry i'm a little slow when it comes to modding volvo's!

Bracer
Tuesday 21st December 2004, 10:20
mate, what is the cbv, and why do you need to blank it off. with the fitting kit that you get with these dump valves do they tell you to do this? i thought that the dump valve fits in place as shown on your photo, and the small pipe off the dump valve goes onto your engine block at the front?
sorry i'm a little slow when it comes to modding volvo's!

Yeah your on the right track, but T5's are fitted with a recirculating valve which does what a BOV does just that it shoves the air back into the intake.

The problem I found is that it starts to leak at high boost pressures and hasn't got a high enough flow to cope around those levels too thus causing compressor stall :mad:

If you leave it in place it will just screw the system up.

CBV Pic 1 (http://www.imagestation.com/picture/sraid104/pf431b6034cd1b18ed3ecf43d01568e5d/f99b9cad.jpg)

CBV Pic 2 (http://www.imagestation.com/picture/sraid104/p8c6d3ebd97d81fd57c205bfdc887c56f/f99b9ca5.jpg)

CBV Blanking Plate Pic (http://www.imagestation.com/picture/sraid104/p634d2909329a8672cac96af8a83dfea4/f99b9c95.jpg)

CAMO
Monday 27th December 2004, 15:22
Cheers Mate I'll Blank That Off The When I Fit The Dump Valve! (by The Way Did You Buy The Blank Plate Or Was It Custom Home Made?

Bracer
Tuesday 4th January 2005, 09:27
Cheers Mate I'll Blank That Off The When I Fit The Dump Valve! (by The Way Did You Buy The Blank Plate Or Was It Custom Home Made?

Yep I made it :wink:

CAMO
Friday 7th January 2005, 10:29
i have fitted the twin piston dump valve now, but at this stage without blanking the other device off. The valve appears to work ok without doing this, you can hear it blowing off when you change gear etc.How will i know if this device still requires blanking off, what symptoms will i encounter? how will it effect the car? is it possible that my vehicle does'nt require having this done?
bracer! your sugestions please?

Bracer
Friday 7th January 2005, 10:42
i have fitted the twin piston dump valve now, but at this stage without blanking the other device off. The valve appears to work ok without doing this, you can hear it blowing off when you change gear etc.How will i know if this device still requires blanking off, what symptoms will i encounter? how will it effect the car? is it possible that my vehicle does'nt require having this done?
bracer! your sugestions please?


Did you fit a washer check valve in the Vac line to the stock CBV just out of interest ?

The main difference you will find with blocking off the CBV is that the new DV will react quicker / be louder / and give better throttle response.

As for your car being different and not requiring the CBV blanking plate, lots of people dont bother cause of the inconvenience but then your only doing half the job in my book and will never reap the true benefits of your had earnt cash.

Just to recap, you've a Bailey DV yes ?

Regards

Steve :wink:

CAMO
Friday 7th January 2005, 16:44
Bracer:
I Purchased A 2nd Hand Twin Piston Dump Valve Off E-bay (ripspeed From Halfords), And A Brand New Fitting Kit Made By Bailey. This Came With All Fittings To Connect The Dump Valve Into The Plastic Hose From The Inter Cooler, With The Small Flex Which Goes To The Vaccum Side Of The Engine Block. There Was No Check Valve Or One Way Valve That Connects In This Line! That Came With The Kit. What Should I Do Mate. (looking For Your Experience On This One Chap!)

Bracer
Monday 10th January 2005, 10:17
Bracer:
I Purchased A 2nd Hand Twin Piston Dump Valve Off E-bay (ripspeed From Halfords), And A Brand New Fitting Kit Made By Bailey. This Came With All Fittings To Connect The Dump Valve Into The Plastic Hose From The Inter Cooler, With The Small Flex Which Goes To The Vaccum Side Of The Engine Block. There Was No Check Valve Or One Way Valve That Connects In This Line! That Came With The Kit. What Should I Do Mate. (looking For Your Experience On This One Chap!)

Ok that sounds all fine mate.

As I've said, by fitting the Blanking plate you will only improve the situation with quicker response / better high boost holding / lower charge temps (due to not recalculating pre charged air) and a louder sound from the DV.

Hope this helps ?

Regards

Steve

CAMO
Tuesday 8th February 2005, 17:36
i/ve had the bov removed, but in doing so its left me with another problem. it seems to be over boosting/ running with too much boost now. the ecu is cutting fuel off when max boost, and the turbo gauge is going over the registered mark. the boost has not been altered, only the bov blanked off as per your instruction. the vac pipe that went to the engine block has also been blanked off. i have even turned off the bleed vale in an effort to reduce the boost. can you assist (urgent!)

Bracer
Tuesday 8th February 2005, 17:39
i/ve had the bov removed, but in doing so its left me with another problem. it seems to be over boosting/ running with too much boost now. the ecu is cutting fuel off when max boost, and the turbo gauge is going over the registered mark. the boost has not been altered, only the bov blanked off as per your instruction. the vac pipe that went to the engine block has also been blanked off. i have even turned off the bleed vale in an effort to reduce the boost. can you assist (urgent!)

So let me get this right,

You've removed your BOV but left the blanking plate in place and not re-fitted the CBV ?

Or you've fitted the BOV and removed the CBV and blanked it off with a plate ?

:crazy:

CAMO
Tuesday 8th February 2005, 17:45
the new dump valve has been fitted for some while now, and run with the stock valve in place. today i have had someone remove the stock valve and put a metal blank plate to blank the space off. (is that clear mate, or do you want me try an explain more?)

Mrsmopp
Tuesday 8th February 2005, 17:59
Bracer sends his apologies he has had to leave work (what am i his secretary LOL)

He'll sort you out tomorrow CAMO :wink:

x

CAMO
Tuesday 8th February 2005, 18:06
thanks awiting his reply. camo

Bracer
Wednesday 9th February 2005, 10:14
Thanks Nat. And sorry CAMO didn't realise what the time was yeaterday and had to dash.

Right I'm with ya now, sorry it was getting late in the day and my brain was scrambled.

Right I'm not totaly supprised that your finding some overboost as thsi is probably down to the fact that your CBV was leaking under boost, and now its been removed and the blanking plate fitted your able to produce more boost.

But did I here you right you've got a bleed valve ? if so sack it off and get a MBC, a bleed valve will never close 100 % even with the adjuster wound in tight !

What BOV did you get ? Is it adjustable ?

The line that came from the CBV really wants to got to the BOV now then you can remove the second line you had to install to run to the BOV, it reduced the risk off leaks !

So what boost are you actually seeing over 15 Psi ? what where you running before ?

Give me a update mate

Steve

CAMO
Wednesday 9th February 2005, 20:35
the bleed valve is now totally closed off.
the bov is a twin piston, originally purchased from halfords (ripspeed i believe).
it is not an adjustable type.
the mechanic has blanked off the cbv with alloy plate, and has removed the cbv all together.
the vac pipe that used to go from the cbv to the inlet has now been blanked off.
on my new bov the vac line goes to another vac pipe next to where the old one went (which is now blanked off).
i have not checked what boost the system is at yet, as the new boost gauge is on it's way, but the mechanic will check this when info has been recieved from you- what shall the boost be set at?
does the boost pressure just need reducing by adjusting the wastegate actuator arm length, or is there something else that is required, or we have not done yet.
please reply asap as i dont want to detonate the t5 lump!

Bracer
Thursday 10th February 2005, 09:11
Right first thing is as I say A bleed Valve will never fully close !

Get a MBC and replace the Bleed Valve, you wont loose the spike till you loose the Bleed Valve !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!

Then once thats done you can tweek the boost between the MBC and the WG to get a Sweet spooling system with no spikes !

Just out of interest had you already made any adjustments to the WG yet ?

And lastly redo the vac lines as I previously said as you have just added 3 more point for leaking which is not a good idea !

O and this is a fine example why I always say that the first mod should always be a calibrated boost gauge !

CAMO
Thursday 10th February 2005, 11:43
o.k mate, so get rid off the bleed valve, and replace with a mbc, (where do i get one from. and how much?)
as an intrim measure shall i adjust the wastgate rod length to bring me back in safe territory?

CAMO
Thursday 10th February 2005, 11:45
also, i forgot to mention, the wastegate hasn't been touched yet, i'll sort the vac lines out!

CAMO
Thursday 10th February 2005, 14:57
what's my next move. bracer?

Bracer
Thursday 10th February 2005, 15:10
Right as far as the MBC goes, I cant fault the ReliaBoost II from Boostscience (http://www.boostsciences.com/home.html) delivered to your door for £30.

As far a the WG goes leave it for the time or ar least Make a unforgettable note of what you adjust it by !

Get the BOV plumed in as previously mentioned.

Get the Boost gauge plumed it.

And once you've done all that I see you back here in about 10 mins i think should be sufficent :wink:

CAMO
Friday 11th February 2005, 15:01
nightmare now over!
wastegate has been altered, and we are now back in safe territory. boost gauge also fitted and boost tops out at approx 11~ 11.5 psi. car's power delivery is smooth and progresive, and no over boosting. i will look into buying one of those valve as previously mentioned.
many thanks for your help bracer, much appriciated!!!

Bracer
Monday 14th February 2005, 10:03
Your welcome Camo, just glad it was a simple if just a pain in the ass problem :wink:

clive d
Tuesday 22nd February 2005, 21:56
how loud are the forgemotorsport dv and the turbo smart dump dv pictured?? wat kind of price??

Bracer
Wednesday 23rd February 2005, 11:23
how loud are the forgemotorsport dv and the turbo smart dump dv pictured?? wat kind of price??

Both the Forgemotorsport and the Turbo Smart valve are pretty quiet.

If you want loud you need to go Turbo XS :wink:

CAMO
Wednesday 23rd February 2005, 18:35
the valve that i fitted prior to the blanking off of the cbv valve was pretty quiet, but after the turbo mod it is loud enough for folke's head to turn on the change phase!

clive d
Wednesday 23rd February 2005, 21:00
sorry2 appear a bit thick but would a forge motorsport fitting kit and turbo xs valve fit together wif the 25mm neck adapter??

Bracer
Thursday 24th February 2005, 09:24
sorry2 appear a bit thick but would a forge motorsport fitting kit and turbo xs valve fit together wif the 25mm neck adapter??

If I remember correctly the mounting boss that I got with my Turbo XS BOV is 25mm diameter, but I will double check for ya :wink:

+ The other good thing about the Turbo XS BOV's is that their adjustable which allows you to get the smooth idel back depending on how good your vac system is :rainfro:

John Ret.
Friday 24th June 2005, 00:34
Just a quick question, where is the blue hose, pictured, going?

Does it go to the same place that the re-circ went to?

Thanks.

t5tart
Thursday 5th January 2006, 03:23
If I remember correctly the mounting boss that I got with my Turbo XS BOV is 25mm diameter, but I will double check for ya :wink:

+ The other good thing about the Turbo XS BOV's is that their adjustable which allows you to get the smooth idel back depending on how good your vac system is :rainfro:

you sound like a chap in the know
what sort of pressure will the standard system hold...this may be why i think im getting turbo leak