13bt in a series 3

[Prof]

Just a question - is it running ok on idle - and only stumbles when you hit the throttle (as in on the transition), settling ok at higher constant rpm ?
 
The reason I say that is it could be enrichment settings you need to change and not the base map.  If you\'ve an AFR gauge or lambda probe you can stick in the exhaust, you can see if the idle is rich or not, and if it is, knock a but of fuel out - it may start to idle poorly - so you may need to tweak it back a little again.
 
Timing can also be a bit off, but if you set the timing spot on when idling - using the pin and marks on the pulley, and then just advance the throttle and watch the leading time mark change - if you\'ve an adjustable timing light - set for 2 stroke or halve it for 4 stroke setting, and it should get to 40 degrees advance by 4000 rpm (with no boost).
 
Also, if you\'ve taken the secondary throttle plates off the throttle body, it can be a bit finicky on rapid throttle changes.

[Archbish]

It\'s OK on Idle, not great.  it really is when accelerating - the harder the worse the stumble.  And it\'s leaving a nice haze behind it as it goes for the poor people following... I\'ve not got a timing light, AFR or Lambda probe, so can\'t do those - may have to grab a timing light to see what it\'s doing.  OF course, if a certain professor was to be passing by my house, with said timing light, and fancied popping in for a bevvy...

[BlitzBoy]

If I get my Wideband sensor by Friday, I shall be with the Madone in the shed , you can pop round and I will stick the probe up ya backside lol

[Archbish]

you going round on Friday?  Cos unfortunately, I\'m off on a stag doo from midday friday, and not back til Sunday afternoon...

[BlitzBoy]

yep , so are off to taking part in the Stag do or are you performing for the Stag hahahaha

[Archbish]

......................yes.

[Prof]

It\'s OK on Idle, not great. it really is when accelerating - the harder the worse the stumble. And it\'s leaving a nice haze behind it as it goes for the poor people following... I\'ve not got a timing light, AFR or Lambda probe, so can\'t do those - may have to grab a timing light to see what it\'s doing. OF course, if a certain professor was to be passing by my house, with said timing light, and fancied popping in for a bevvy...

Off to JAE this weekend, but can pop over Monday when we get back if that\'s any use ? :cheers

[Archbish]

only if you\'re free dude.  Problem is I don\'t normally get home from work til late (7:45ish) which might be a bit late for pootling around in a seven...  but may take you up on it later in the week if that\'s OK??

[Prof]

only if you\'re free dude. Problem is I don\'t normally get home from work til late (7:45ish) which might be a bit late for pootling around in a seven... but may take you up on it later in the week if that\'s OK??

No worries - I get home 5-5.30 ish most nights - but could come via Farnborough on the way back - or leave it till the following weekend.

[antnicuk]

good work bish,  as for tyres, just stick some 5mm spacers on the fronts,  that should be enough to clear it and they only cost a few quid.

[Archbish]

I would do, but I already have 15mm spacers on the front...  Should probably have got the thinner tyres to start with as these should miss better.

[Prof]

You still in need of the timing light to check timing ?
 
If so, I can pop over some time on Saturday with it (may also have Mitch with me).

[Archbish]

So finally took it down to Geff to face the music and find out how much of a bad job I\'d done on the car...

It\'d been running \'OK\' with the base map, but it would stumble from about 3k onwards, and I simply didn\'t know what the deal is.  So today I was hoping for either:
1 - a perfect map
2 - a tweak and fix, and then a perfect map
3 - find out what\'s wrong, go away, fix it, and then back for a perfect map.



What happened was option 4 - a tweak and fix, and then a start on a perfect map, and now go away and fix what broke next.  

So the first thing to sort was the secondary injectors - Geff spotted that they were more than a touch clogged up from the transition to secondary injectors kicking in.  Changed the filters, and straight away it\'s a different beast.

Then whilst mapping, the dump valve flange decided to disassociate itself with the pipe it was attached to.

So here is the pic of the chart - highlight is 176 rwhp, at 4k rpm at .7bar, before having to drop the run.


but the main part has been driveability.  I borrowed a hose to patch over the hole where the dump valve had been, and while it isn\'t the best approach, did give it beans a few times on the way home.

OH HELLO!!!!

On my private junction, a touch of clutch dumping had a very sideways approach to the world, and it\'s a very different animal.

So what I\'m gonna do is get through Le Mans (I was so nervous the car would fall apart today...), and back, and then finish with a big fat map on the car, and see what I\'ve put together.  

The best part for me today was seeing how composed and centred the car was on the rollers.  it didn\'t suggest any significant problems in the engine, drivetrain, or otherwise.  Very, Very chuffed.

[shaunwil]

Sounds like it will be a very tidy little car

Should easily make double what you have seen too. That will make it a little rocket !

Lovely bit of work so far

Shaun

[Prof]

Nice one Bish
 
Did notice when we drove past on the way to the diy place that the beast was out
 
I can\'t wait to drive mine now - fixed the clutch and now the battery is flat - sticky ignition switch caused it to drain
 
Still - impressed by the boost curve - it can only get better from there. Am I right in understanding... - is that at the wheels ?