Part Throttle Det Pre boost - Has anyone had this

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Brocky

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Katy TEXAS

8th Oct, 2010 at 02:52:26pm

Gents,

While I am driving at a constant speed and then I just touch the throttle to accelerate a little bit (so the vac gauge goes from say minus 20 psi to minus 10 psi, it starts pinking its arse off, just until the boost transition point at which point it disapears.

In others if you boot it theres no issue...but traveling on the high way in traffic is a night mare.

This occurs from around 2.5 k, and seems to occur due to the reduction in vacuum approching the transition point at above 2.5k

Has anyone had this ?

I am using a 10 PSI needle and spring and metro turbo fueling set up with fabbed holder and all the usual blanked off.

I am currently backing off the advance on the jolt around this area on the map but not sure if this is the solution

Thoughts appriciated

Cheers

Brocky

BTW - I took my buddy VTEC Pete out for a spin this weekend, and even though I am running her in, he gave it a name, the "Brocket"...cause I'm a brocket maaannn, nah nah nah nah nah nah nah nah nah nah nah....

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Tom Fenton
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Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner

TM legend.

Rotherham South Yorkshire

8th Oct, 2010 at 03:00:56pm

Do you have a wideband fitted, what is the fuelling doing at this point?

On 29th Nov, 2016 madmk1 said:

On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else

Like fuel 😂😂

apbellamy

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King Gaycharger, butt plug dealer, Sheldon Cooper and a BAC but generally a niceish fella if you dont mind a northerner

Rotherham, South Yorkshire

8th Oct, 2010 at 03:09:07pm

Wrong damper oil in the carb, causing it to go mega lean?

On 11th Feb, 2015 robert said:
i tried putting soap on it , and heating it to brown , then slathered my new lube on it

Brocky

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Katy TEXAS

8th Oct, 2010 at 03:18:25pm

Wide band is in progress, I have welded the boss into the down pipe, but need to fit sensor and gauge etc.

AFR looked good on the last RR session I did, but that was a straight power run so wouldn't have show this condition. *frown*

Are you thinking it could be leaning out?

FPR is set to 3.5 PSI. and has new bosch pump just fitted.

Also I think this only started when I switched to US fuel which is suppose to be more det tolerant but not as calorific.

John

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Mongo

Barnsley, South Flatcapshire

8th Oct, 2010 at 03:20:05pm

It sounds similar to the Van. Leaning out on transition.

If something is worth doing, it's worth doing half of.

Brocky

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Katy TEXAS

8th Oct, 2010 at 03:21:45pm

I will re check the oil level just to be sure, I did wonder if the spring might be too weak also.

Are thinking thinner oil might help ?

On 8th Oct, 2010 apbellamy said:
Wrong damper oil in the carb, causing it to go mega lean?

Brocky

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Katy TEXAS

8th Oct, 2010 at 03:23:14pm

How did you fix it ?

On 8th Oct, 2010 John said:
It sounds similar to the Van. Leaning out on transition.

Brett

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Doncaster, South Yorkshire

8th Oct, 2010 at 03:31:44pm

too much ignition advance in that region of the map to begin with?

Yes i moved to the darkside *happy*

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Kean

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aka T2clubby

South Staffs

8th Oct, 2010 at 03:33:14pm

Do you have the part throttle lean off pipe blocked? If not I recommend doing it.

Brocky

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Katy TEXAS

8th Oct, 2010 at 03:45:23pm

Thats what I was thinking, but fueling might be the root cause...

What level of advance are people using in this region say at 2.5k ?

I think I've got around 28 at 0 PSI, but 31 at -10PSI is that too much ?

The det seems to start at the -10 PSI point and go away just before transition.

On 8th Oct, 2010 Brett said:
too much ignition advance in that region of the map to begin with?

Edited by Brocky on 8th Oct, 2010.

Brocky

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Katy TEXAS

8th Oct, 2010 at 03:45:57pm

Lean off is blocked :)

On 8th Oct, 2010 t2clubby said:
Do you have the part throttle lean off pipe blocked? If not I recommend doing it.

fab

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Parisien Turbo Expert

Paris\' suburb

9th Oct, 2010 at 07:00:14am

by 10 pi needle and spring do you mean avonbar one?

evolotion

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Glasgow, Scotland

9th Oct, 2010 at 07:04:45pm

itll be a "lean tip in" get it on throttle transients all the time, solution is to increase acceleration enrichment, on an SU, i would be playing with the spring (heavier) or heavier dashpot oil, OR thinning down the needle so the part jsut forther down of your cruise location is slightly richer, youll need some way to gauge where the needle sits at cruise to do this accurately though :)

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

stevieturbo

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Northern Ireland

10th Oct, 2010 at 10:30:00am

So how much timing do you actually have at these points ?

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Brocky

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Katy TEXAS

10th Oct, 2010 at 04:35:44pm

Hey Stevie,

I have been playing with the map and I have retarded the timming at the transition point to:

27 at 2 - 2.5 rpm
28 at 2.5 - 3.0 rpm
29 at 3.0 - 3.5 rpm etc

The pinking has stopped.

Are these figures typical or am I over compensating on backing of the timming to fix another issue say lean out ?

The trigger wheel and bracket should be spot on in terms of offset as they were from Tom F.

Brocky

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Katy TEXAS

10th Oct, 2010 at 04:36:23pm

Yes

On 9th Oct, 2010 fab said:
by 10 pi needle and spring do you mean avonbar one?

evolotion

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Glasgow, Scotland

10th Oct, 2010 at 05:22:11pm

On 10th Oct, 2010 Brocky said:
Hey Stevie,

I have been playing with the map and I have retarded the timming at the transition point to:

27 at 2 - 2.5 rpm
28 at 2.5 - 3.0 rpm
29 at 3.0 - 3.5 rpm etc

The pinking has stopped.

Are these figures typical or am I over compensating on backing of the timming to fix another issue say lean out ?

The trigger wheel and bracket should be spot on in terms of offset as they were from Tom F.

impossible to say if your lean without a wideband :)

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

Brocky

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Katy TEXAS

10th Oct, 2010 at 05:29:18pm

Hey evo

Just noticed your other post,

Like you say I need to pull my finger out and get the wide band fitted, I have the boss welded in already from the last strip down so just need to order the kit *smiley*

I have richened up the mixture a little too just to be on the safe side.

Cheers

Brocky

On 10th Oct, 2010 evolotion said:

impossible to say if your lean without a wideband :)

Edited by Brocky on 10th Oct, 2010.

fab

1497 Posts
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Parisien Turbo Expert

Paris\' suburb

10th Oct, 2010 at 05:56:12pm

The avonbar 10 psi should be on the rich side

stevieturbo

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Northern Ireland

10th Oct, 2010 at 06:42:17pm

So how much timing did you have in there ??

Must have been a hell of a lot to cause pinking.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

shane

2645 Posts
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Lowestoft, Suffolk.

10th Oct, 2010 at 07:17:49pm

I second this, caused me a lean out on the wideband, diconnected and plocked it, job done.
SHane

On 8th Oct, 2010 t2clubby said:
Do you have the part throttle lean off pipe blocked? If not I recommend doing it.

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Part Throttle Det Pre boost - Has anyone had this
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Part Throttle Det Pre boost - Has anyone had this
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