IanWatson

Richie - times are hard, I want cheap performance!!

[Edited by IanWatson - 5/2/2002 12:54:36 PM]

IanWatson

This is when I wish I lived back in the UK!!

Life has it's benefits over here, I guess

Edited to say - cheers for the suggestion on the module, guys - I'll deffo check it out.

[Edited by IanWatson - 5/2/2002 1:36:35 PM]

IanWatson

Wondered if there happened to be people on the board who've fitted a DD themselves to a car with a Unichip fitted?

Was ready to fit my DD this weekend, but I had a hint on a previous thread from John that there may be issues - I'm think fairly clear on what the Dawes does, but have very little on how the Unichip may cause problems.

Any hints, tips or warnings?

cheers
Ian

Jamie Whitfield

Ian

I forgot to mention but I'm sure http://www.Vishnuperformance.com might be a good source of info on this one.

Jamie

www.j-w-racing.com
www.performanceexhausts.net

IanWatson

that was quick Jamie!! I'll check it out...

Mo

Ian,

why??

what do you use to control boost at the moment?

I'm currently running Unichip and controlling boost with an EVC4 but I'm thinking of changing to a Dawes. I just want to know your reasoning behind it.

Cheers.

WRX280

Why not use the Unichip with Dasteks optional Boost Module?

IanWatson

I was planning on buying a EBC at the time of getting the Chip fitted, but PS were out of stock and I didn't have time to leave the car with them.
So - I'm just running the Unichip in terms of engine mods. Decat down-pipe and straight-through back box the other relevant changes.
It's a euro MY99.

I (perhaps stupidly) assumed there was still some benefit of reducing wastegate creep and increasing rapidity of spool-up, although I wasn't anticipating such gains as would be expected with the OEM ECU. Hence why 40 quid seemed like money well spent!!

Mo

Ian,

how well is the boost controlled, do you have a boost gauge fitted? IF so what is held boost and do you get any overboost?

WRX280, it weren't available when I had mine fitted.

IanWatson

I got my boost gauge from Jamie - will be fitting this weekend. But I've never had any 'overboost' situations, and the power seems fairly steady through the rev range once the turbo is spinning.

I'm still interested to know why John thought this would be a potential nightmare - I'm not questioning the validity of that opinion, I'm just a little short on info to understand where the pitfalls may lie...

Mo

Ian

mail me offline.

IanWatson

Mo - YHM

john banks

It is fine IF the Unichip is mapped for it. The standard ECU on the MY99/00 especially seems to be able to fuel and time the ignition massively outside the parameters of the original map, but the Unichip is deliberately leaning out the fuelling and advancing the ignition where possible to get the gains. If you had a Knock and lambda link, or a copy of Delta Dash (you need to adjust the values with a piggyback but it can be done) you could go for it, but I would not advise just slapping on a Dawes with a boost gauge like you could get away with on a car without a Unichip. This is the cautious line, and it might be OK, but I wouldn't risk it on my own car.

When I put a new turbo on this weekend I will be starting at 10 PSI and working up slowly watching all as I go. You cannot be too cautious.

dfullerton

I have a Unichip fitted legacy turbo 94, and had a apexi ebc. after it broke i fitted a dawes which works well, went to PS and got it checked out and it was fine. But there is a drop in torque between 4000 and 5000 rpm ,PE say i should get a remap

dazz1

John,
I tested this out on my US WRX a few days ago and I received a strange result.
I've the Unichip tune by Cobb with 3" turbo-back exhaust & Uppipe.
Well I remove the factory vacuum line leading to the Tee Wastegate and turbo nipple. Then install the DD MBC.
I could never get it to boost past 8psi in any gears except for 5th. I then adjust the DD MBC and thought it was not set high enough. It kept on spiking to 19+psi boost. in 2nd gear.
I only went to 2nd gear and no further for saft reasons.
I kept adjusting the MBC but never was able to achieve a stable boot pressure or a desire 15psi.
I not sure what causes this but I went ahead and remove the DD MBC and I'm currently using the Unichip BC set at 15.5psi max.

I know the DD works well on my mate car that doesn't have a Unichip. Boost pressure would hold at 1.0 bar and all the way to redline.

TIA

IanWatson

I was aiming to keep the boost levels no higher than already being achieved with the Unichip until I can get back to Blighty for a PS re-mapping session.
I was under the impression that I would still see significant decrease in turbo spool up time without fueling issues.

Is it the full-boost/part-throttle effect that could cause the mixture to lean out?

john banks

Dazz that seems odd behaviour. I am not going to insult you by asking if the Dawes was installed backwards or connected improperly, but this is when I have seen this sort of behaviour. I find it difficult to see why a Unichip would stop it working - the Dawes completely takes over boost control? So excluding install/Dawes fault I am puzzled too.

Ian the full boost part throttle is one issue, but if the turbo spools quicker and earlier it could be too lean- you would probably loose torque rather than it being dangerous. Also even at standard boost the boost will hold flatter up top and it could be too lean. The MAF will correct to a degree, but I would worry that you are eating into safety margins too much.

If the Unichip is mapped for it them great, but if it is a later bolt on you have to be cautious.

Richie1

You should think about the Dastek Boost module. It has an internal MAP sensor able to detect up to 2.5bar absolute (1.5bar boost) pressure and allows the programmer to program the boost every 800RPM or so meaning you decide what levels it runs at what RPM.


Not entirely sure if a different module is available with a MAP sensor that can read more boost but a constant 1.5 bar is quite a lot

Richie1

Cool Ian

The module is £100 so its a fair bit more than the DD. As long as you find a good UniChip mapper then you're laughing

WRX280

Richie,

Mark at Owen Developments is awesome! I know of 94+ MR2 Owners, which have had 300BHP/lb-ft of torque with JUST a Unichip and Boost module ALONE! I highly recommend this guy!

Oh and FYI, Owen's is having a 1000BHP 4WD dyno installed PRETTY soon!

Regards

Richie1

WRX280 - He has the 4WD dyno there as of last week so it should be in VERY soon (was built by Gerry@Storm)

There are 2 UniChip mappers in the UK that have the best rep. These are Gerry (UK distibutor) and Owen Dev (recommended as a top one by Gerry and a lot of others).

I was going to get mine done by Gerry at the start of June but he sold the 4WD dyno to Owen Developments

Guess I'll just need to trundle all the way down there to get done before having a blast up Santa Pod


Anyone wanna recommend some accomodation near Owen Dev ??

WRX280

When are you due down there? Am there on the 31st of this month!

I spoke to Mark about 3 weeks ago, and he was saying he should have a 4WD before my 31st May date! Its good he got it earlier, gives him time to get used to what he has

Cheers Mate!

john banks

The last I heard the Dastek boost module was using a fixed duty cycle map by RPM with the result of some variation depending on environmental conditions. They said they were working on a 3D map boost control using full PID. If you can get this If not, unless you need to adjust it by RPM (say you are tapering a frisky large turbo) it seems an odd choice compared to more capable (albeit more expensive but more capable user adjustable EBCs).

I would have thought you want your existing mapping checked whatever method of boost control you use?

Richie1

Aiming for the 21st June as its about 280 miles from me but there is a Vauxhall day at Santa Pod (bout 60 miles from Owen Dev) on the Sunday (23rd) so will stay down for that


John - you're right about the boost module but its horses for courses I guess. I am not looking for adjustable boost, I need the module to take over the boost control from the rather restrictive Motronic ECU that is standard on my car

I really dont need adjustable boost so cant justify the expense really. Its all wired in anyways and ready to go.... Just need to book a time for mapping

Waiting on OD to phone me back for a date

dfullerton

anyone got their phone number please!

Mo

01865 821062