nom

I've been following the Dawes discussions for some time - it seems to me that the fiddling is slowing down & the 'best' set-up has been reached. Well, for now, anyway. The thing is I'm not too sure where everyone has ended up? Which is the non-peaky place to put the thing?
Which is the bit in the many threads to follow so I don't end up doing everything Anyone written it up on a web-site yet?
Ta for any help.

john banks

Turbo nipple to wastegate with bleed hole increased to 1.5mm on a MY99/00 works best - adjust to 16 PSI on original ECU, 18 PSI on Prodrive ECU in 4th/5th gear. Disconnect the pipe to the solenoid and cap it off with a screw in the end. Remove the T-piece as well. Also remove the original hose off the turbo nipple (with restrictor inside) and replace with the grey hose you get with the Dawes, but swap the end it is fitted to and shorten it as much as you can.

Clear as mud.

This is "The Best (TM)" setup.

paulwadams_my99

do you just stick any screw that will fit then and will it go back on if you remove the Dawes. I have to admit that a summary on your web site might save you time in the long run and clear some of the confusion from multiple threads. I bet you'll be able to cut and paste most of it won't you? Go on Go on Go on Go on......oh shi** my self assesment.

nom

Much better
I'll have a bash at The Best (TM) & then start to catch up with the The Latest (TM) which will undoubtedly be Much Better (TM) by the time I get it done.

While I'm here, has anyone other than the one post I found somewhere found that the improved/posh/expensive/overpriced version of the device doesn't overboost without the hole drilled out?

[Edited by nom - 1/21/2002 4:34:29 PM]

john banks

Any screw will do of the right size that is a snug but not a stupidly tight fit and it goes back on afterwards. The expensive version may peak slightly less, but will give excessively brisk spool up on part throttle with the small turbo IMHO, and the bleed virtually cures this.

GavinP

Here are the main threads:

http://www.scoobynet.co.uk/bbs/threa...threadid=53568

Some fitting photos/general advice:

http://www.scoobynet.co.uk/bbs/threa...threadid=63578

Thanks

Gavin

Darren king

Anyone tell me the best way to order one of these without putting credit card details on line, and how long it would take to come?

Cheers

Daz.

Richard Curtis

nom,

Try it without the hole drilled first, i got the slightly more expensive one without any drilling and does not overshoot at all.

I think it also depends what breathing mods you have, if you have a fully decatted free flowing exhaust (i think as per Johns set up) there is more tendency to overboost. If your running a standard downpipe (as I am) it dampens the spool up and you may not get any overboost.

john banks

Look out for part throttle full boost issues though. This was the reason I added the bleed not because of overshoot (this was a happy side effect). In 5th gear at 3500RPM I could have the same boost and performance and by moving my right foot just change the exhaust note and the air fuel ratio from 5 to 8% CO! Just imagine the EGTs. Also it makes it more sane to drive on bends. I just could not confidently throw the throttle about out of bends before the bleed like I can now.

nom

OK - I'm getting the posh version that's meant to control itself better, but have the de-cat exhaust (the possible upset mentioned). I'll try it without the hole first & see what happens - rather harder to un-drill a hole than make one in the first place

Thanks for all the help guys!

[edited fro het susal lepslling stimakes]

[Edited by nom - 1/21/2002 11:21:44 PM]

paulwadams_my99

I don't know what has happened, i posted a reply and then it vanished??

anyway, I can't get the pictures that HarryBoy posted, don't know if they have gone permanently. I want them because i want to verify what the solenoid is.

Can someone please explain if this is correct.


existing setup

wastegate--T----nipple (whats this the turbo out?)
................|
................solenoid

and if so

dawes setup

wastegate----dawes---nipple (same as above)

screw
...|
solenoid

thanks for your patience.

Paul

john banks

Spot on Paul.

paulwadams_my99

ahh thanks john!

mrp

I have just received my Dawes and was wondering why it is suggested to increase the size of the bleed hole? (will I need to do this?)I am running a standard uk MY96 (awaiting a Revolution exhaust - centre pipe & rear box - and K&N panel filter before fitting the Dawes). Should I be worried about runnnig lean? (I had intended to limit boost to 1 bar currently 0.8)

thanks for your help

Martin

john banks

On a MY96 leave the bleed hole alone. I would just put it on - need not wait for your breathing mods, but I would get your car checked on a Select monitor or in some other way for fuelling, ignition advance. Boost gauge is mandatory.

I don't know where fuel cut is on MY96, but 1.0 bar may be it. Why not post and ask in Drivetrain a new thread.

[Edited by john banks - 1/22/2002 8:57:10 PM]

mrp

Thanks for that. I may be showing my ignorance here but....what exactly is a Select monitor?


Martin

john banks

dealer plug into your car to interrogate the ECU with car running.

ScoobyJawa

According to You and Your Impreza Turbo by Haynes, which was proof read by Pete Croney and Mike Tuckwood, the fuel cut on MY99+ is around 1.25 bar and the pre 99 cars was 1.0 bar as John says.

GavinP

Fuel cut is 15.5psi on 93-96 cars - I had the forehead bruises (when hitting the windscreen ) to prove it...

Thanks

Gavin

Scott W

I'm with Gavin in that I've got the forehead bruises to prove that the cut out on a MY00 is 1.25 bar

Dyney

Don't quote me!!!! But I think the fuel cut on post97 cars is about 1.25 bar or 18psi

Yes I do have the bruises

Iain.

ScoobyJawa

I think the way to look at it is 1 bar on the big turbo(TD05) model and 1.25 on the smaller turbo(TD04) models ???????