LG John

I've got the fear! I was out and about today and it is freezing (literally!). I wasn't going fast because of the unpredictable surface conditions but I did notice the car spiked at 1.3 bar in third and was then holding about 1.25bar in 3rd (target boost!!) in the straights. I happened to be passing East Fortune air field so pulled off (cheers farmer Jack ) to drag it where I didn't have to worry about other cars, etc. She didn't spike in 5th but would go to 1.31-1.32 bar and hold The car sounded fine but recent threads - you know who you are *cough* mike - have got me paranoid!!

Is this an acceptable overboost given the cold conditions! The car would hit and hold 1.25-6bar in 4th and 5th in more normal weather conditions...i.e. March/April time.

Then I started to think more about it and realised that as far as I'm aware I'm the only person on this BBS that has a TEK2.5 and uses the dawes to control boost!! Why, sound I consider handing the control back to the ECU?

What are people's opinions on this. What sort of boost would become really harmful to my car running a TDO4? Recently someone's TDO4 jumped to 1.6bar briefly and that wrecked it I sort of have 1.3 in my head as a no-no point and crap my pants if it goes over that. Where is the Tek2.5 fuel cut by the way?

Also, I doubt its related but my zorst seems to pop and bang a little more than when first decatted. Sometimes get it on downchange or lifting off and it sounds great but is that the sign of a problem. I have a normal dump value (OE) and thought this prevented pops, bangs and flames.

Sorry to go on but I firmly fall into the category of 'can't afford a rebuild'

john banks

I ran my TD04L at 1.3 bar all last winter on a PPP ECU with a decat. Doesn't mean you should though

Your car was mapped not to det at 1.4 bar remember That is your safety margin.

There are a few running maps with a Dawes.

Your alternative as I said before is to get hold of a 3 port solenoid and we could put the ECU back in charge of the boost control with a held boost of 1.25 bar and a peak in 5th gear in these sorts of conditions.

Or you could buy a knocklink for some reassurance.

Can I come and play at this airfield too ?

My recommended boost level is 1.25 bar held in 5th gear. Ultra cautious maybe. But the odd bit of 1.3 bar is not going to harm it. I tell people 1.25 bar so we have that nice safety margin.

Don't go chasing boost levels forever, the TD04 is small, and it is pointless going really high.

john banks

Fuel cut on your car is 19.75 PSI which is 1.36 bar sustained for a few seconds.

EvilBevel

LOL,

Well, you prove his point in a way

1.3 bar with your setup in very cold/freezing weather is not harmful in 99.9 % of the cases.

I'm not sure what overboost limit John has programmed in, but with a MY99/00 car you would normally start to feel "fluctuating" boost when you are really too high.

1.3 in summer would scare me, in winter it wouldn't.

Edit: d'oh, posted right after John, and with the Dawes you wouldn't get the fluctuating boost bit obviously

[Edited by EvilBevel - 12/18/2002 5:16:44 PM]

Gridlock Mikey

Sorry Saxo, it seems that i have in advertantly caused exactly the kind of unneccesary fear of which i was speaking.

Am i right in saying that John has "fettled" your car? If so, why are you worried?

Mikey

LG John

And there we come to my biggest fault.......memory...or lack of!!

What was I saying.....

You've put my mind at ease a lot more John, thanks! Mike and Co might be comfortable with trusting fuel cut but I'm not. Didn't realise we even mapped as high as 1.4 bar...if it hit that I'd jump out of the moving car with the expecation of bits of metal coming flying through the dash from the exploding engine!

As another point and and leading on from the 'SUL Report' the car was mega fast today just after the boost was dropping off (i.e. high revs). What's got me worried here is T-UKs post in Mikes thread that said something about MAF failure followed by leaning out (hence more power) followed by melted pistons. Car idles ok Am I being overly paraniod here? Is it just those nice big gulps of fresh cold air thats doing all this.

BTW, John, what boost are your running these days, what is your fly bhp (or best guess) and have you gone internal yet?

LG John

John mapped my car yes but the ECU doesn't control the boost the dawes does - hence I do. I could (not that I would) turn it up have mental fun for a while and then probably have to pay for a new engine. Even without the dawes I'd be a little apprehensive, its just the sort of person I am. If I had my way the car would have an AFR meter, knocklink, EGT metre, oil temp meter and oil pressure metre....then I'd feel a little comfortable. But your right it would look like the enterprise and that little lot would cost more than the mods!!

john banks

All I have is a knocklink and a boost gauge. Presently my car is peaking at 1.45 bar in gears 2-5, holding 1.4 bar and dropping off to 1.3 at the top. BHP = "Adequate" (really). Not planning to go internal unless I am forced to.

dhorwich

why not just re-set your dawes when its cold, as it will be like this for a few months now... (cold)

Dan

ScoobyJawa

My turbo hit 1.6 - but the turbo itself is fine. Turns out the only thing thats gone is the wastegate mechanism, its not closing fully. Should be able to get it repaired.

T-uk

All I have is a knocklink and a boost gauge

but how many times has your car been checked with the ecutek software,in the last week though ?.an afr **might** just give enough warning for the rest of us about a MAF problem.

Saxo,

all those mods and only a boost gauge,you must be mickey's hero ,bigger ***** than me thats for sure I must be far too cautious.

LG John

I see your point T-UK but if a maf is going to go its probaby going to be just as damaging as it would to a standard car. In fact, if you take the example of a non-enthusiastic standard car driver they might ignore the other warning signs that would trigger altert with me. I suppose its calculated risk! If I had my way I'd have oil temp and pressure, egt temp, afr and a knocklink

T-uk

standard car can cut boost if the ecu picks up a problem,yours can't .

Andy.F

T.Uk 1000 posts woooohooooo

ps turn your boost down everyone, anything over 1 bar is instant death or at least so I was told last year at this time.

So, 1 years severe thrashing at up to 1.8 bar later and it gives a little warning 'tick' Can't complain really

john banks

The only disco lights I really need for regular monitoring are the knocklink, and if paranoid the AFR. I did have my DIY AFR, but it never told me anything useful. I know it will det if it goes lean enough to interest me I only ever get the laptop out to make it quicker

LG John

LOL

Fair point T-uk, I forgot about that!