Having never pushed my own car past .86 because of EGT's getting up to and beyond the realms of what the engine let alone turbo is supposed to be safe for then I can't see it lasting.

As John has already stated, retarding the igntion to control temps does nothing for power.

boost is sensible (1.4BAR) on a good intercooler (I made it so it's excellent of course ) and a huge turbo so not in the slightest overstressed.

Andy

 

I run 0.76 lambda on plain Optimax (11.2:1).

 

But I thought higher lamda output meant richer. Is that wrong? I'm only running 1 bar

 

higher lambda is leaner, lambda of 1 is stoich.

paul

 

How can I get mine down then. I'm only runnin a very stock setup
V2 sti

 

reflash the ECU using ECUTek software or buy an aftermarket ECU.

Forget the ECUTek route if it is a pre 97 model.

Andy

 

fcukin suicide.

 

Lambda 1 = 14.7 so 14.7 x .89 = 13.083:1 afr which would scare the crap out of me.

I happy with around 11.2:1 at 1.3bar for pump gas with my ej257.

 

0.91 lambda, or 0.91volts on a narrowband lambda sensor?

If it's the latter then you are running quite rich, certainly on the safe side of things.

Paul

 

i'm running 12.5:1 until 0.5 bar
At fullboost i'm running 11.7:1 - 12.0:1 At 1.5-1.6bar

Forged pistons and rods, Hybrid Fmic,colder sparkplugs, walbro, TD06 turbo on a 2.0 CDB. Heads been adjusted for 8500 rpm

 

Narrow band . Sorry Paul didn't make myself very clear.
Will be fitting a wide band soon.
What do you think of the SAFC as a tunning device

 

LOL...

All is well then.

 

banny sti I never sneer at anyone and any comment I make on this bbs is intended to assist not hinder, as Paul states those of us that tune these cars are (or should be )knowledgable about afr's from experience, unfortunately you can throw the book out the window and no two cars will ever allow the same maps and hence afr's to be used.
Dave C1 posted a very good extract from a text book BUT did not make it clear that he was doing it, that can mislead others into making very expensive mistakes, he is not the first and won't be the last.

We all try an map to as lean an afr as a car will stand but some cars need fuel, one of the commonest causes of big end failure is overheated pistons nipping in the bore causing bearings to get loaded up and hence picking up.

As I said that is an expensive mistake to make from lack of knowledge.

You can stop a GC8 MY99-00 closed loop fueling from acting by unplugging the lambda sensor.

Dave C1 don't let people confuse you with narrow band voltage readings when others are thinking in true afr's. A narrow band voltage of 0.91 is fine and would not cause an issue. At 0.89 its getting flakeyand at 0.84 its too lean, thats related to WOT and max boost/engine load btw.

You need to avoid a wideband sensor getting heated above 800 deg C for any longevity.

And no I am not going to post the afr's I use when I map, firstly they can never be the same car to car and secondly I put alot of hard work into deriving the best (in my view) set of values to use dependant on Model year. I do share the info btw.

Finally when taking narrow band voltage readings you also have to consider the age of the sensor and its true condition, plus output drops as egt rises, all that has to be factored in.

bob

 

'Dave C1 don't let people confuse you with narrow band voltage readings when others are thinking in true afr's.'

I think that was my fault for not making myself clear

Thanx to everybody for there help(and it wasn't even my post originaly)