croxton7

Hi,
I have a dawes on MY96 and have been looking at upgrading standard ecu to Link.

My question is can the Dawes and the Link be ran together or is this pushing the boundries of the engine to far ?

Cheers
Steve

dowser

The dawes is just a manual boost controller. The link includes an electronic boost controller. Why would you want to do this? Set-up correctly, the Link doesn't require it.

Richard

SecretAgentMan

I've been trying to perfect boost control for a long time with my link....and I got it fairly spot on in the end, fast spool up with v little overshoot - BUT I got very poor boost in the lower gears.

I thought this was a characteristic of the turbo/engine and didn't think more of it....until I tried a Dawes just for fun...

Let's just say - 1.3 bar in 1st is a HELLUVALOT more fun than .9...

It's probably a problem that could've been sorted with a stronger actuator - but this works just as well, and it's dirt cheap.

It does feel "wrong" though.

/J

LG John

I run a dawes with a TEK3'd ecu which is good enough to get the same boost as the dawes but I'm told by JB that the dawes has better control and his word is good enough for me

MorayMackenzie

I am experimenting with a dawes alongside a motec... seems to do the job.

dowser

OK - I admit it...it's a pain to set-up, but I still prefer ecu control of boost.

After lots of work I got 18psi perfect on my car with a 3 port on the JECS, 20psi is a different matter so far However, Mark at EMS reports no issues with JECS/2 port.....maybe it's 'operator error'?!

SAM - was that with 2 or 3 port?

Richard

SecretAgentMan

3-port.

I had issues with setting a high enough duty cycle to get it to boost in the lower gears, and not getting overshoot in the higher gears.

It's all a matter of wastegate creep IMHO.

/J

dowser

But with the 3-port creep doesn't come into the equation does it? The manifold line is separated from wastegate by the solenoid, so wastegate only opens when solenoid says so.

What does seem to be a problem is the standard actuator getting sucked open at higher revs, and upsetting the balance - but this is not much of an issue with the JECS error control.

My biggest problem is controlling the spool-up sufficiently - even a simple change like asking for 2psi more boost changes the way you need to 'nurse' the damn thing up to speed. Oh well, I've got nothing but time....what's the maximum number of times I can flash a JECS, lol?

Richard

john banks

About 60 reflashes apparently. I did about 50 on one and it was OK.

I am very happy indeed with the Dawes boost control compared with the original ECU, and it seems it batters most of them. Very odd that a £35 relief valve can do this, but after a while it feels less "improper"

SecretAgentMan

Richard - I do think the Link lets the actuator "see" manifold preassure until a given RPM (user selectable) when it starts to control the solenoid.

So, as soon as we're starting to see positive preassure, the wastegate creep shows it's ugly head.

With the Dawes keeping the line completely shut this is eliminated, and the smile-factor increases by a factor of ten.



It's not without drawbacks though, the "small throttle input vs full boost" issue, which can be sorted somewhat.



/J

dowser

John - I *really* hope that's not right

J - but the solenoid is either open or closed - if the link holds it open (manifold connected to wastegate) then just set it to control boost earlier. I know it's not as easy as that, and I know it's a pain to set-up.....it intrigues me as to what's going on, and how to control it. Basically, I'm a stupid b*stard

Richard

SecretAgentMan

The major issue with setting the RPM where it starts controlling the wastegate is a thin line between wastegate creep and MAJOR overshoot.

In short - it's really not worth the hassle trying to emulate the (by comparison) perfect Dawes with a stock soft actuator.

Not for me anyway, as I'm clearly lacking in the black arts of Link wastegate control.



/J

croxton7

Thanks for all the replies guys.
Think I will stay with the Dawes after getting a firm price of £1400 ish !!, can't see as it has got much more to offer over and above my current set-up.

God bless the man who developed the Dawes ! and soooo cheap for what the little gem does.

Thanks again.
Steve

SecretAgentMan

I see the Dawes as an easy way to get really good wastegate control, and use the link for ignition and fuelling.

Without the link I wouldn't want to run 1,4 bar on a FMIC:ed VF23 through a 4-1 header and a full flow zorst.



/J

SecretAgentMan

Somehow I doubt it's as good as the Dawes J. I've developed an allergy towards wastegate creep lately.



/J

Mr J

SAM Maybe I should put back my Dawes than...
Only problem with it that it dosen't tale the boost down at high rpm´s..at +6000 I get even more boost than it set at...if I get 1.2bar in the in 1-3 gear then I get 1.25bar @+6000 rpm in 4th and 5th gear.

Never tried the Dawes @ 1.4bar though

/Kvarnis

SecretAgentMan

WUSS



/J

P.S.

Mr J

So you switch to the Dawes now SAM

I have started to experiment with the 2-port and I get ~16-17psi in 1th gear and no searius overboost at higer gears so far...

/Kvarnis

[Edited by Mr J - 9/12/2002 8:28:03 PM]