NefMoto

i ve got a downpipe on the way, and im wondering what changed can be made to my tune now.
just to BTS and thats it? or are there any other benefits of the downpipe? more boost?

thanks

also because it is a cat-less dp, how do i keep my CEL from coming on? diable the rear O2 map?(all to 0?)

cat delete is 1 byte.

that should be easy to find  ::)

not any harder than me7.

never worked with me7, but ill worry about that later.
do most disable bts altogether? or just up the EGT threshold?

Why would you touch BTS?

http://nefariousmotorsports.com/forum/index.php?topic=3104.msg31288#msg31288

dang, i was hoping yours was 115b or h! that would have been easy! oh well, ill just have to figure  it out.

because the egt modeling would be off, right?? thats what ive found when searching, that once you have downpipe, you can disable BTS, or just raise the BTS EGT threshold to where it wont interfere.
is this incorrect?
so what are the benefits then, besides a slightly quicker spool up? holding more boost longer in RPM range??
 

I do not think you understand in the slightest what BTS is there for.
It is component protection. It works by adding fuel to cool down the combustion temperature.

You have removed the CAT, but removing BTS and relying only on ATR (if ATR is even active) will result in cracked exhaust manifolds and failed turbos.

I think you should better educate yourself on the function of the internal combustion engine, so that you can make informed decisions and understand what every module is there for.
Even reading Funktionsrahmen about this function tells a great deal as to why it is there.

i understand why it is there.
but wont it be adding fuel for no reason?
if it thinks my EGT is 900deg and its really 700deg, im wasting fuel, and loosing performance right??
obviously other changes would need to be made for correct fueling, i assumed scaling lamfa load and using it would be sufficient? no?

Why do you think that your EGT magically fell by 200 degrees after removing the CAT?

I don't see how LAMFA is sufficient when you are not driving at WOT all the time.
You do realize if you try to do lambda 1 on part throttle all the time, you are easily going to hit EGT limits?

those temps were an example...
i was under the impression that med9 LAMFA was 50-100% not like me7, please correct me if im wrong.
or just tell what changes you might make if im going about this wrong?

thanks for any suggestions

I don't really understand the question...? Just fit an EGT probe in your turbine housing (right after the exhaust manifold, entering the turbine) and see what you make of it.
If you can see that (using either logging of fuel or using a wide band lambda sensor) the car starts to heavily ad fuel before it even starts to get warm, then it's time to adjust.

the basic question is how do you change your tune to take advantage of the larger catless downpipe.

Well, given that it was actually the downpipe that was the major restriction (I guess that you evaluated this before the purchase?) I also guess that you had issues with high back pressure and high EGT's at high loads and that you concluded that the major restriction wasn't the turbine housing nor the exhaust manifold and as a result invested in a larger downpipe? If so, measure what kind of back pressure and EGT's you have now, check that the compressor outlet temperature increases linear with boost (and not exponential, suggesting that the compressor is running out of steam) and just crank up the boost, adjust the fueling to keep EGT in control and adjust timing to avoid too much timing pull...

Again, I really hope that you concluded that the downpipe was the major restriction... Otherwise there is not much power to be gained until you remove the real obstacle (which might be something completely different).

that's the general consensus, yes.

Well, the general consensus in the 16th century was that the earth was flat (some still beleive this)  ;) *Smile*
On a more serious note, all I'm saying basically is that you should measure back pressure and EGT while tuning your software for the new donwpipe, otherwise it will be sort of hard to see when you hit the limit once more.

All the best and good luck,