340BHP-WRX

iTrader: (6)

How safe is it to run an Andy Forrest 20g at around 1.5-1.6 bar with no BOV ?

I'm not sure whether to fit my HKS ssqv VTA,recirculating or to just remove it and blank it off ?

Any opinions on what would be the best option ?

I'm having my car mapped soon so need to have it one way or the other before then.

Brun

Ask Andy

frayz

iTrader: (7)

Cant see a problem.

The Mistsubishi turbos are very strong from what i understand.

340BHP-WRX

iTrader: (6)

Spoke to Andy Forrest and he said the turbo will be fine

He did say though that the air blowing back out over the MAF may affect the driveability.

Brun

................but the sound will be worth it

trails

iTrader: (41)

cool, I thought i was right...i get that issue running a BOV with a fmic; when you lift off sometimes you get a nasty judder because of the air moving back across the MAF. You just learn to drive around it

Varboy

As said, probably be fine:

But

BOV is there for a specific purpose, ie it rids of excess charge which would otherwise cause your turbo to stall, which in turn increases lag.

I can't see this as advantageous unless of course you are going to map in some anti - lag.

T5OLF

iTrader: (4)

What you need is a 96/97 oe DV. I have tried several and this is the only one that fixed the same problem.

trails

iTrader: (41)

thanks for the advice, any idea why it solves the problem?

T5OLF

iTrader: (4)

As you say, I think it has something to do with air going over the maf, not sure why it fixes it.

Have a read of this:
Redirect

trails

iTrader: (41)

i need a log in to access the page...any chance of a cut and paste?

T5OLF

iTrader: (4)

Having a few problems with my DV since fittingfront mount. The DV is a recirculating forge item. At around 4500 rpm if I lift off to say 4250 the car judders, been told the DV is not opening and releasing the boost so it’s blowing back over the maf and coursing the ecu to add more fuel, hence the judder. My other problem is a slight surging at low speed and general rough running at low speeds.

Brief spec is: 550 inj, FMIC, full decat, apexi ecu, K&N induction kit and pipe, AVC-R

The car was mapped last week by Andy F but we never did any slow 1st /2nd gear stuff so never picked up the surge etc or the DV problem. Anyone got any ideas as to what may be wrong?

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Check that the dump valve is definately dumping or not.

If it isn't, remove, strip down and clean then lightly oil with 3 in 1 and reassemble.



Godzilla wrote:
Check that the dump valve is definately dumping or not.

If it isn't, remove, strip down and clean then lightly oil with 3 in 1 and reassemble.


Ok cheers, will give that a go. I think it dumps between gear changes just plays up when lifting slightly at high revs.


Quite a common problem with FMICs and too hard a spring in the DV.

What colour spring is in the Forge DV? It may need a softer one, either that or an OEM 97/98 DV works well on the setup you have.

I always sort out low speed running and general driveability issues before mapping on boost

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AndrewC wrote:
Quite a common problem with FMICs and too hard a spring in the DV.

What colour spring is in the Forge DV? It may need a softer one, either that or an OEM 97/98 DV works well on the setup you have.

I always sort out low speed running and general driveability issues before mapping on boost


I will have to look inside not opened it up yet.

I always sort out low speed running and general driveability issues before mapping on boost - Would have been a good place to start !


AndrewC wrote:
Quite a common problem with FMICs and too hard a spring in the DV.

What colour spring is in the Forge DV? It may need a softer one, either that or an OEM 97/98 DV works well on the setup you have.

I always sort out low speed running and general driveability issues before mapping on boost


Andrew, I have just bought a 22B DV to try, is it the same as/similar to a 97/98 DV?

I have an Apex VTA on now and i'm still having the problems at part throttle at around 3500/4500 rpm.



Yep same thing, hope you didn't get stung being told it was a 22B DV?


Yes 22B DV is identical to UK97/98 and STi V3/4.

Adz is doing some research at the moment with his, so perhaps you 2 can swap notes?

You either want it to dump really easily or only when there is reasonable boost in the system, say over 10psi, the first will smooth out all driving conditions better but the second will help to retain some pressure in the sytem when pushing on through the gears. The horrible shuddering tends to be due to prolonged venting back at lowish boost such as when rolling off the throttle.





jim litten wrote:
Yep same thing, hope you didn't get stung being told it was a 22B DV?


No......well ok yes I did paid 26 quid so not stung to much I hope.

The hose cost me the same again so I hope this works.



AndrewC wrote:
Yes 22B DV is identical to UK97/98 and STi V3/4.

Adz is doing some research at the moment with his, so perhaps you 2 can swap notes?

You either want it to dump really easily or only when there is reasonable boost in the system, say over 10psi, the first will smooth out all driving conditions better but the second will help to retain some pressure in the sytem when pushing on through the gears. The horrible shuddering tends to be due to prolonged venting back at lowish boost such as when rolling off the throttle.

Andrew...


Andrew,

Yep we will be swaping notes and hope to come up with an answer. As soon as my pipe arrives from raldes I will update. I may swap back to my resinator box(between maf and turbo) and see if that makes any difference. I'm a little reluctent as the was mapped with it on.

T5OLF

iTrader: (4)

Joined: 20 Jan 2006
Last Visit: 24 Oct 2007
Posts: 549

Posted: 04 Aug 2006 22:39 Post subject:

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Cheers-
was away last weekend,havent had time to finish my mod

but if swapping for another dv solves it,then its a lot less work

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K555UFO
Impreza Sport


Joined: 19 Nov 2005
Last Visit: 25 Oct 2007
Posts: 301

Posted: 04 Aug 2006 23:05 Post subject:

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K555UFO wrote:
adz wrote:
got a pic of new setup?


It's dark but i will try


http://img.photobucket.com/albums/v2.../scooby066.jpg

http://img.photobucket.com/albums/v2.../scooby064.jpg

http://img.photobucket.com/albums/v2.../scooby063.jpg

http://img.photobucket.com/albums/v2.../scooby062.jpg

http://img.photobucket.com/albums/v2.../scooby060.jpg

I bought these bits from Raldes for 30 quid

1 x 32 >25mm Bore Straight Reducers
1 x 32 >19 Bore 90° Reducing Elbow

I then put a small 19mm pipe connector in the turbo inlet manifold and pushed the hose over the top and clipped it. I could not get a 32x19 reducer, only 32x 25 but worked out ok by putting it over the top of the black inlet pipe. The metal hose connector stops the pipe squashing when nipped up. I then ran a 19 id pipe to the bend on the hard pipe/inlet to throttle body.

Last edited by K555UFO on 05 Aug 2006 00:04; edited 3 times in total

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adz
Impreza Turbo


Joined: 20 Jan 2006
Last Visit: 24 Oct 2007
Posts: 549

Posted: 04 Aug 2006 23:25 Post subject:

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cars lookin well

how was it ruunning when you had the std dv on before the apex or forge ones?

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K555UFO
Impreza Sport


Joined: 19 Nov 2005
Last Visit: 25 Oct 2007
Posts: 301

Posted: 04 Aug 2006 23:54 Post subject:

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adz wrote:
cars lookin well

how was it ruunning when you had the std dv on before the apex or forge ones?


The standard one was the best out of those three but at part throttle it would play up and make strange screeching noises. It was a pain when feathering the throttle when cornering at high speed. The apex was the worst. The forge was no different to the standard one.

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adz
Impreza Turbo


Joined: 20 Jan 2006
Last Visit: 24 Oct 2007
Posts: 549

Posted: 05 Aug 2006 11:57 Post subject:

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its funny,when i got the apexi ind kit,there was a reducer to fit in pipe just before the std dv- the car ran well apart from the judder around 4500
i never fitted the reducer so maybe ill try it with std dv see what happens?
apexi obviously supplied it for a reason

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K555UFO
Impreza Sport


Joined: 19 Nov 2005
Last Visit: 25 Oct 2007
Posts: 301

Posted: 05 Aug 2006 21:29 Post subject:

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adz wrote:
its funny,when i got the apexi ind kit,there was a reducer to fit in pipe just before the std dv- the car ran well apart from the judder around 4500
i never fitted the reducer so maybe ill try it with std dv see what happens?
apexi obviously supplied it for a reason


Got to worth a try, what DV are you running?

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adz
Impreza Turbo


Joined: 20 Jan 2006
Last Visit: 24 Oct 2007
Posts: 549

Posted: 05 Aug 2006 21:34 Post subject:

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i was running the std one,have got the gfb one on at moment

venting some out though as well as re-circ

either to try std or later one i will have to get some hose-rsm was shut when i went this morning ,so prob wait and get a 97 dv off andy this week and plumb that up

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K555UFO
Impreza Sport


Joined: 19 Nov 2005
Last Visit: 25 Oct 2007
Posts: 301

Posted: 07 Aug 2006 22:29 Post subject:

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adz wrote:
i was running the std one,have got the gfb one on at moment

venting some out though as well as re-circ

either to try std or later one i will have to get some hose-rsm was shut when i went this morning ,so prob wait and get a 97 dv off andy this week and plumb that up


Yep that seems the way to go, mine is fine now I'm using the 97 type.

Cheers for that piece of info Andrew C

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adz
Impreza Turbo


Joined: 20 Jan 2006
Last Visit: 24 Oct 2007
Posts: 549

Posted: 07 Aug 2006 22:36 Post subject:

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ive got the hose set up ordered that you posted thanks,Andy has a 97 dv will collect mid week then try it-
would like it nice n smooth for setting up of avcr this weekend

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K555UFO
Impreza Sport


Joined: 19 Nov 2005
Last Visit: 25 Oct 2007
Posts: 301

Posted: 08 Aug 2006 09:21 Post subject:

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adz wrote:
ive got the hose set up ordered that you posted thanks,Andy has a 97 dv will collect mid week then try it-
would like it nice n smooth for setting up of avcr this weekend



Good luck, keep me updated

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adz
Impreza Turbo


Joined: 20 Jan 2006
Last Visit: 24 Oct 2007
Posts: 549

Posted: 10 Aug 2006 20:04 Post subject:

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rsm still waiting on samco order from a month ago!
so used raldes-stuff came next day!

fitted the later dv and all seems fine,our lass jus gone out in it,
so ill know for sure how flat out running is

will see how it is tom night-
thanks for input guys


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K555UFO
Impreza Sport


Joined: 19 Nov 2005
Last Visit: 25 Oct 2007
Posts: 301

Posted: 13 Aug 2006 18:34 Post subject:

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adz wrote:
rsm still waiting on samco order from a month ago!
so used raldes-stuff came next day!

fitted the later dv and all seems fine,our lass jus gone out in it,
so ill know for sure how flat out running is

will see how it is tom night-
thanks for input guys



Raldes are spot on and good prices also. Lets hope all is well mate

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AndrewC
LADS Techno Bod and Founder Member


Joined: 10 Mar 2004
Last Visit: 25 Oct 2007
Posts: 1900

Posted: 14 Aug 2006 11:10 Post subject:

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I think we can safely say that te MY97/98 DV has resolved the problems on Adz's car

Just needs some new coilpacks now

trails

iTrader: (41)

thanks T5OLF, gonna wind the adjusting screw right out on my HKS BOV (already converted to re-cric), and look for a larger diameter hose...I want to switch back to the OEM anyways; currently am slightly embarrassed by the noise the HKS BOV makes!

T5OLF

iTrader: (4)

No probs, hope it helps noise wise the oe one with the front mount etc is very noisey also.

This is mine at full chat, can be made quiet around town if you drive steady though.
YouTube - Subaru Impreza type RA

THinking of running mine without just to get rid of that embarrassing noise.

rossyboy

iTrader: (8)

I also have the juddering problem with FMIC and Forge VTA. Now I know why

trails

iTrader: (41)

decent vid, awesome road!

the HKS BOV is terrible, even though it's converted to re-circ it makes a really loud vvvdada, vvvdada...funny how so many people ask how to get their car to make that noise and I bl00dy hate it

T5OLF

iTrader: (4)

Yeah I hate it, people pay good money for that niose!! I would like a nice thirpy sound rather than the one it has. Not sure if the standard TD05 on mine will stand having the DV removed. Time will tell I may try it when I get the car remapped next year.

Hol

iTrader: (1)

I dumped the Forge one on mu APS front mounted car in favor of the OE spec recirculating one.

Much better throttle response.

trails

iTrader: (41)

anyone got a pic of a MY97/98 BOV...are they the same fitting as the MY99/00?

harvey

iTrader: (48)

99-00 goes on the TMIC but 97-98 fits in the pipework.
E-mail me your e-mail address and I will take photos and send them to you.
If you pay the postage you are welcome to borrow one off an STi3 or 4 and I also have one from an STi 6 along with a flange adaptor that you could try.

trails

iTrader: (41)

Cheers Harvey helpful as always

Is the 97\98 just mounted differently or are they totally different animals?

T5OLF

iTrader: (4)

99 bolts to intercooler the 97/98 looks like this:
http://img.photobucket.com/albums/v2.../scooby064.jpg

trails

iTrader: (41)

looks identical...it just floats rather than being attached to the ic...thanks T5OLF

harvey

iTrader: (48)

Correct. You need to use a flange adaaptor on a 99-00 and also on New Age cars to achieve the same free standing installation.
I just happen to have a few adaptors for each type here if antone is stuck.

PS One of my wagons, 422 bhp last time it was on the rollers is using a Seat Ibiza (I think) BOV which I got for nothing. It works very well.

trails

iTrader: (41)

I've got an HKS fmic so will probably make up an adapter plate and weld it into the HKS BOV fitting on the pipe work...I'll try winding out the top bolt on the SSQV first and see if that helps.

harvey

iTrader: (48)

Adaptor £20 if you want it.