Don't forget that it also works more frequently after the car is warmish and also stay in that gear (eg 2nd) for longer. Somethings got to spark them unburn fuel you know.

[Edited by Katana - 12/6/2002 5:32:54 PM]

 

I had the cats removed today.
Seems to be faster and loads of backfires.
Anybody know a technique for loud poping and banging?
DAVID WALLIS any news about the chip?

 

Th legacy mapping is progressing. The latest effort works well, remains detonation free up to 17psi, but the boost control is a little off, leading to fuel cuts in 4th and 5th. This was on someone else car, as it was fine with mine. SO there is a little work to do to make it more universal.

Paul

 

Hello Paul,

Ive had imperza heads put on and ive been advised not to increase the boost to more than 14psi, David said you would be able to cater for this?

Andi

 

In the mean time the engine aint gonna go pop with no cats is it?

 

Legacy,
Since putting Blitz d/valve on with de-cats have had loads of pops and backfires but have found that more voilent ones are between 2-3k and sound like fireworks they are that loud.Ive found to get them more i change gear a little slower.Instead of changing qiuckly just take a fraction slower to go through neutral into chosen gear.The only thing i cuoldnt work out is that if booted they are less frequent but driving around town they are commonplace.
Gene

 

gene1 EXCELLENT!
I noticed the 2-3K greater volume.
Thanks again

Andi

 

Impreza heads may make it a more complex task, and in this case I can't help but think it's easier to run a dawes set at 14psi and leave it at that.

I have been working with 2 people on refining maps by post, it's slow, not very accurate without logging software, and not something I want to do all the time.

The higher compression you'll get with the heads should lead to improved off boost response anyway, and more power for the same boost compared to a std compression engine.

If you want pops and crackle, that can probably be sorted, but if you only want performance, get a Dawes.

Paul

 

The exhaust will probably pop and crack more when it gets well and truly sooted up inside. Thats what I found with my decat anyway.

 

Also depends on ecu

Extra ignition advance on low load can put the emissions out, and as a result the lambda sensor thinks it needs to add fuel to remain at 14.7:1, but infact overfuels, ignites in turbo and you get pops.

I think this is why some cars pop more than others, because of the ecu variations

Paul

 

Lets just get one thing perfectly clear 'POPS' are good, more performance is good.

Guess thats what i want pavlo more poke and more/louder pops.

Can you sort that then?

(i'm gonna pop the night away!!!!)

 

In fact thinking about it more i now think:
In the right situation (normal driving)Pops and backfires are more sought after than performance, after all you cant drive like colin all the time
So can you help me pavlo?

 

I suspect so.

Will see what I can do.

Paul

 

Nice one pavlo,

I knew you wouldnt let me down my son!