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+--- Thread: Over sensitive throttle at certain rpm + low groan (/showthread.php?tid=15582)
Over sensitive throttle at certain rpm + low groan - ginge191 - 16-07-2013
Had this little niggle for a while.
I'll try and describe this the best i can; i believe Poodle also experienced this whilst he was passenger the other week. Both fairly stumped.
Firstly, it doesn't affect the driving too much, but does make a kind of vibration noise.
This issue only really happens (id assume) at around 2.5k/2.7krpm - 4krpm or so.
I'll be acceleratiing and suddenly a heavy 'grrrrrrrrrrrrrr' , not really an agressive sound, but a lower tone to the whole engine noise.
In combination with the sound, comes an overly sensitive throttle, i can literally blip the pedal and the car will jump. When "off" the issue, the car obviously won't jump; similar to a petrol at high rpm "jump" if that makes sense.
The issue doen't happen at speed; it's rpm related, so i can be sat still revving and still hear the low noise.
I hope this has been explained the best as possible, if anyone has any ideas, please chuck it in. The car will be at FCS, so if anyone wants to listen and try and diagnose, be my guest!
Just a little curious i guess; it's done it since the car's been running. A good 4/5 weeks now
I can try get a video if anyone would like.
thanks!
RE: Over sensitive throttle at certain rpm + low groan - Piggy - 16-07-2013
sounds like a dodgy governor?!
RE: Over sensitive throttle at certain rpm + low groan - ginge191 - 16-07-2013
Could be; the pump hasn't been touched internally...?
RE: Over sensitive throttle at certain rpm + low groan - Jonny81191 - 16-07-2013
Does it coal more if you put your foot down when it's being all sensitive?
RE: Over sensitive throttle at certain rpm + low groan - ginge191 - 16-07-2013
(16-07-2013, 12:05 PM)Jonny81191 Wrote: Does it coal more if you put your foot down when it's being all sensitive?
nope not particularly, it coals about the same amount until on full chat; then clears up, as per with an derv tune
RE: Over sensitive throttle at certain rpm + low groan - Piggy - 16-07-2013
weird.
RE: Over sensitive throttle at certain rpm + low groan - ginge191 - 16-07-2013
hmm anyone else have any ideas, anything else to check out?
RE: Over sensitive throttle at certain rpm + low groan - darrenjlobb - 16-07-2013
Sure its not just the LDA dropping with boost..
RE: Over sensitive throttle at certain rpm + low groan - Mitch - 16-07-2013
I know exactly what you mean, mine does it as well, i believe it to be something to do with gov/lda, can show you at fcs if you like
RE: Over sensitive throttle at certain rpm + low groan - ginge191 - 16-07-2013
(16-07-2013, 03:44 PM)darrenjlobb Wrote: Sure its not just the LDA dropping with boost..
I don't think so; i've never had this with any DT before.
If i remove the pin and attempt rev, would this rule the problem in/out?
(16-07-2013, 03:49 PM)Mitch Wrote: I know exactly what you mean, mine does it as well, i believe it to be something to do with gov/lda, can show you at fcs if you like
interesting; how long has your's done this now?
any pump mods?
RE: Over sensitive throttle at certain rpm + low groan - darrenjlobb - 16-07-2013
Dont take pin out, wind starwheel up a bit, and see if it has any effect.
RE: Over sensitive throttle at certain rpm + low groan - Mitch - 16-07-2013
(16-07-2013, 03:50 PM)ginge191 Wrote:(16-07-2013, 03:44 PM)darrenjlobb Wrote: Sure its not just the LDA dropping with boost..
I don't think so; i've never had this with any DT before.
If i remove the pin and attempt rev, would this rule the problem in/out?
(16-07-2013, 03:49 PM)Mitch Wrote: I know exactly what you mean, mine does it as well, i believe it to be something to do with gov/lda, can show you at fcs if you like
interesting; how long has your's done this now?
any pump mods?
Ever since the bosch has been on, around a year, only a ground lda, unsure about gov as it came of a 'tuned' xud previously, but i wouldnt of said anything has been done gov mod wise.. Mine only seems to happen between 3.5k and 4.5k though.
RE: Over sensitive throttle at certain rpm + low groan - ginge191 - 16-07-2013
(16-07-2013, 03:52 PM)darrenjlobb Wrote: Dont take pin out, wind starwheel up a bit, and see if it has any effect.
I'll have a tug tomorrow when i'm under the bonnet with swaughan
RE: Over sensitive throttle at certain rpm + low groan - Mitch - 16-07-2013
(16-07-2013, 03:52 PM)darrenjlobb Wrote: Dont take pin out, wind starwheel up a bit, and see if it has any effect.
Going to go and try this now, will let you know results
RE: Over sensitive throttle at certain rpm + low groan - Ruan - 16-07-2013
I'll put money on LDA... Mine does this majorly, hence why I removed the spring...
RE: Over sensitive throttle at certain rpm + low groan - Piggy - 16-07-2013
(16-07-2013, 06:09 PM)Ruan Wrote: I'll put money on LDA... Mine does this majorly, hence why I removed the spring...
surely that means it stays down all the time?!
RE: Over sensitive throttle at certain rpm + low groan - darrenjlobb - 16-07-2013
Yeah, just turns it into a NAD pump, ideal really, right foot > LDA all day long
RE: Over sensitive throttle at certain rpm + low groan - Ruan - 16-07-2013
LDA causes all sorts of weird timing issues... That's what causes the typical XUD intermittent power... What people always do is wind the star wheel up so it takes a lot to drop it on boost, wind out the smokescrew so there's no fuel off boost, so you then jam your foot down, you've got loads of max fuel so you've got shit loads of tension on the governor against the LDA pin...
So you've got no fuel to drop it, it's sprung so that it can't drop easily and is being pressed so hard sideways from the governor from the pedal requesting shit loads of fuel... Its a wonder it ever drops!!!!
This is the precise reason VEs are a bloody nightmare!
RE: Over sensitive throttle at certain rpm + low groan - Piggy - 16-07-2013
so basically an improved progressive replacement spring would be better?
Or is foot control the way forward!?
RE: Over sensitive throttle at certain rpm + low groan - Ruan - 17-07-2013
Doesn't solve the other issue of the governor pressure. That's what'll almost always PROPERLY jam it...
That's why if you "feed" the throttle in slowly, it'll end up pulling better, mash your foot into it, it'll probably jam out and not work right...
But if you're feeding it in anyway, why not just do it manually anyway, then there's no chance of jamming it... Just more chance of a complete engine bog with way too much fuel, but you quickly get used to dipping the clutch and slipping it a bit to clear it and bring it on boost quicker anyway.
RE: Over sensitive throttle at certain rpm + low groan - ginge191 - 19-07-2013
So slight update; I rotated the star wheel anticlockwise/up about 8 clicks.
It hasn't made a huge difference; a slight difference if not a placebo affect on my ears. Bits it's still there.
Anything else i could try?
RE: Over sensitive throttle at certain rpm + low groan - Mitch - 19-07-2013
id try winding it up some more, wound mine 2 whole turns and its made it slightly better id say
RE: Over sensitive throttle at certain rpm + low groan - ginge191 - 19-07-2013
But what affect would this have on the LDA?
RE: Over sensitive throttle at certain rpm + low groan - Dave - 19-07-2013
+1 for the spring removal
how mine currently is. Not only do I had ecus not letting me have the fuel I request but got sick of ve's not responding either!
RE: Over sensitive throttle at certain rpm + low groan - ginge191 - 19-07-2013
Remove the spring all together and regulate fuel via throttle an right for control?