Jerky at low throttle/cruise - TPS enrichment settings?

[petew]

Hi all, been driving the car around a bit and I'm sick of this ongoing slight jerkiness. At low throttle. I was initially thinking this was not enough spring on the throttle, but the more I thought about it, the more I thought it was TPS settings. Here's my current table...

Jerky throttle TPS settings.jpg

Here's a log from a while back too...

Jerky throttle TPS settings.jpg

Thoughts?

[Clonebug]

I have that a little bit right now too......

I'm thinking it's a little leanness on accel and also in the lower rpm cruise areas.

Mine does it between 1500-1800 rpm in the first 3 gears especially in third cruising through town really slow.
I never have the computer along with me to fix it though since most of my driving this summer has been to work and back only.

My thoughts are it is a combo of afr and timing......try afr first.

Running an engine at a constant 14.7 or leaner is not what most of them want.

Mine has a slight lean spike at initial throttle when accelerating that I tried to correct with accel enrichment.

According to Andy Whittle you want to use the map bins to get as much accel as possible. All you use accel enrich for is to get that last little bit.
He has a video on it for MS-3 and it makes sense. I just haven't had time to incorporate it into my tune yet since I very seldom get into that situation when driving to work and back.....

Here is the video....it's for a W/C car but it's something you can play with.....

https://www.youtube.com/watch?v=KSUUVuSqRCY

[petew]

I have that a little bit right now too......

I'm thinking it's a little leanness on accel and also in the lower rpm cruise areas.

Mine does it between 1500-1800 rpm in the first 3 gears especially in third cruising through town really slow.
I never have the computer along with me to fix it though since most of my driving this summer has been to work and back only.

My thoughts are it is a combo of afr and timing......try afr first.

Running an engine at a constant 14.7 or leaner is not what most of them want.

Mine has a slight lean spike at initial throttle when accelerating that I tried to correct with accel enrichment.

According to Andy Whittle you want to use the map bins to get as much accel as possible. All you use accel enrich for is to get that last little bit.
He has a video on it for MS-3 and it makes sense. I just haven't had time to incorporate it into my tune yet since I very seldom get into that situation when driving to work and back.....

Here is the video....it's for a W/C car but it's something you can play with.....

https://www.youtube.com/watch?v=KSUUVuSqRCY

You nailed it. That's exactly where the issue is. I spoke to another friend (non VW) and he said AFRs straight up. Sent me an AFR table and it helped straight away.

[panel]

This is a great video re setting up your accel. I bet you'll lower your TPSdot threshold % after watching this vid.

[BBvideo=560,315]https://www.youtube.com/watch?v=HSE3CxaWF-I&t=815s[/BBvideo]