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LOW SPEED JERKINESS AFTER MANUAL CONVERSION 

 

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 Post subject: LOW SPEED JERKINESS AFTER MANUAL CONVERSION
Posted: Sat Nov 01, 2014 1:04 pm 
Parts Gopher
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Location: sydney
NSW, Australia

Hi everyone,

I recently carried out a manual conversion to my ed falcon sedan.

When I did the conversion I used a t5 from a ed
Re enforced pedal box and fitted new pedal bushes
Fitted new clutch cable
Fitted new exedy standard clutch
Had the 6 bolt flywheel machined
I used the manual tailshaft

So the issue is at low speeds coasting and very light throttle I gets a jerky feeling through the driveline mainly when slowing slightly (not using brakes). Its definatly not a engine missfire or anything like that its almost feels like its got heaps of diff lash or something.

Ive heard people say on here possibly bushes in the back end so ive replaced with nolathane
Sway bar link and d bushes
All the watts link bushes
Complete upper tailing arms
gearbox mount with non nolathane item

Ive also checked the
Uni joints
Diff lash
The lower trailing arm bushes dont looked cracked
Which all seem ok

Im loving the acceleration with the 5 speed but the low speed jerkiness is annoying me so much im getting tempted to put the auto back in as I didnt have this issue until fitting the manual.

Any help would be appreciated

Cheers

 

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 Post subject: Re: LOW SPEED JERKINESS AFTER MANUAL CONVERSION
Posted: Sat Nov 01, 2014 3:06 pm 
Getting Side Ways
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Joined: 22nd Jun 2011

Ride: '97 EL Fairmont Ghia

Location: Perth
WA, Australia

I'm pretty sure it's because the idle settings are different from auto to manual. The engine over corrects and then cuts the air repetitively.

Try unplugging the ISC and adjusting the idle screw so the engine doesnt die and see if it still does it.

 

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 Post subject: Re: LOW SPEED JERKINESS AFTER MANUAL CONVERSION
Posted: Sun Nov 02, 2014 12:39 am 
Parts Gopher
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Location: sydney
NSW, Australia

Ok cool thanks for the tip il try that tomorrow. I am using the manual ecu so could disconnecting the isc still help?
Thanks

 

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 Post subject: Re: LOW SPEED JERKINESS AFTER MANUAL CONVERSION
Posted: Sun Nov 02, 2014 1:03 am 
Stock as a Rock
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Age: 34

Posts: 125

Joined: 27th Apr 2011

Gallery: 8 images

Ride: ea falcon

Location: tanilba bay
NSW, Australia

i've had the same problem for a while now, found there was a heap of slop in the diff.. changing it tomorrow i'll report back with my result.

 

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EA falcon(S-Pac) AU engine and injector's, EL BBM conversion,K&N pod,EL ECU,T5 5speed,EL Streering rack, EL Brake system, Extractor's 2 1/2in high flow cat, through 2 1/2in mandrel bent pipe with Lukey Performance muffler

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 Post subject: Re: LOW SPEED JERKINESS AFTER MANUAL CONVERSION
Posted: Sun Nov 02, 2014 10:32 am 
Parts Gopher
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Location: sydney
NSW, Australia

Ok thanks for that EAfalconS

I couldnt really feel any excessive lash in my diff but I suppose the engine can feed more torque into it compared to me just twisting the tailshaft back and for so if I have any the t5 will find it haha.

If I get to the stage and the lsd needs to be rebuild I reckon il get 3.9:1 gears in it and just put the auto back in.

Thanks

 

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 Post subject: Re: LOW SPEED JERKINESS AFTER MANUAL CONVERSION
Posted: Sun Nov 02, 2014 11:22 am 
Getting Side Ways
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Age: 34

Posts: 1110

Joined: 27th Dec 2011

Gallery: 6 images

Ride: ef falcon futura

Power: 154 rwkw

Location: Koo Wee Rup
VIC, Australia

What other mods? J3? Cam? That happens when its too rich on decel aswell.

 

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ef futura, pacemakers, 2.5inch catback, k&n panel filter and 3.45 lsd. extractors/cat, ticky head, custom cam grind, t5. now onto cosmetics.

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 Post subject: Re: LOW SPEED JERKINESS AFTER MANUAL CONVERSION
Posted: Sun Nov 02, 2014 1:31 pm 
Parts Gopher
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Joined: 1st Oct 2011

Location: sydney
NSW, Australia

Nothin to extreme

Crow 901a stage 2 biilet cam
4499 pacemaker extractors
High flow cat
2.5 exhaust with 2 mufflers
Xh snorkel
Kn filter
3.27:1 lsd

All these mods were carried out before the t5 conversion. The cam is a real baby it idles like a p***y cat.

Cheers

 

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 Post subject: Re: LOW SPEED JERKINESS AFTER MANUAL CONVERSION
Posted: Sun Nov 02, 2014 1:42 pm 
Getting Side Ways
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Age: 34

Posts: 1110

Joined: 27th Dec 2011

Gallery: 6 images

Ride: ef falcon futura

Power: 154 rwkw

Location: Koo Wee Rup
VIC, Australia

tuned?

 

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ef futura, pacemakers, 2.5inch catback, k&n panel filter and 3.45 lsd. extractors/cat, ticky head, custom cam grind, t5. now onto cosmetics.

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 Post subject: Re: LOW SPEED JERKINESS AFTER MANUAL CONVERSION
Posted: Sun Nov 02, 2014 2:06 pm 
Parts Gopher
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Location: sydney
NSW, Australia

No I was told by the mob who sold me tge cam it was the biggest I could be before I need a chip so its just got the stock manual ecu.

 

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 Post subject: Re: LOW SPEED JERKINESS AFTER MANUAL CONVERSION
Posted: Sun Nov 02, 2014 2:09 pm 
Getting Side Ways
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Age: 34

Posts: 1110

Joined: 27th Dec 2011

Gallery: 6 images

Ride: ef falcon futura

Power: 154 rwkw

Location: Koo Wee Rup
VIC, Australia

My guess would be too rich on decel then.

 

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ef futura, pacemakers, 2.5inch catback, k&n panel filter and 3.45 lsd. extractors/cat, ticky head, custom cam grind, t5. now onto cosmetics.

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 Post subject: Re: LOW SPEED JERKINESS AFTER MANUAL CONVERSION
Posted: Sun Nov 02, 2014 2:41 pm 
Parts Gopher
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Joined: 1st Oct 2011

Location: sydney
NSW, Australia

Hi everyone thank you for the responses

I just disconnected the isc and set the idle screw so it will just idle when dead cold with the ac on and I took it for a bit of a drive and hopefully its not some sort of placebo effect but I reckon its actually better.il give it a couple of days and report back if its better.

I wonder if your onto something with the running rich on decel. It dissapoints me a bit because the company that sold the cam said I wont need a chip with this cam. if I knew I needed one I would of got a bigger cam AND a chip! Grrr o well.

Is there any sort of mechanical adjustment I can do to lean it out a bit on decel? Or j3 is my only option. I was reading a thing on autospeed about jim mock and they reckon there dev packages run the stock ecus does this mean they get random shudders and stalls etc when people get the bigger cam packages?

Thanks

 

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 Post subject: Re: LOW SPEED JERKINESS AFTER MANUAL CONVERSION
Posted: Sun Nov 02, 2014 2:46 pm 
Getting Side Ways
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Age: 34

Posts: 1110

Joined: 27th Dec 2011

Gallery: 6 images

Ride: ef falcon futura

Power: 154 rwkw

Location: Koo Wee Rup
VIC, Australia

As soon as you change cams, you change the vacuum of the engine which throws out the tune. Some cams are small enough that they will run on a standard ecu however they wont be running the best it can be. My opinion is that you should tune any cam.

 

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ef futura, pacemakers, 2.5inch catback, k&n panel filter and 3.45 lsd. extractors/cat, ticky head, custom cam grind, t5. now onto cosmetics.

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 Post subject: Re: LOW SPEED JERKINESS AFTER MANUAL CONVERSION
Posted: Mon Nov 03, 2014 9:07 pm 
Parts Gopher
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Location: sydney
NSW, Australia

Update.

Unfortunately the issue is still there so disconnecting the isc hasn't solved it so il be looking at getting a chip from ti performance. Also tempted to go a bigger cam while im there.

thanks for the help everyone.

 

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 Post subject: Re: LOW SPEED JERKINESS AFTER MANUAL CONVERSION
Posted: Tue Nov 04, 2014 3:02 pm 
Stock as a Rock
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Age: 34

Posts: 125

Joined: 27th Apr 2011

Gallery: 8 images

Ride: ea falcon

Location: tanilba bay
NSW, Australia

So i changed the diff to a nice EL one, and redone the tail shaft with new uni joints.. Done deal, driving like a new one. :D

 

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EA falcon(S-Pac) AU engine and injector's, EL BBM conversion,K&N pod,EL ECU,T5 5speed,EL Streering rack, EL Brake system, Extractor's 2 1/2in high flow cat, through 2 1/2in mandrel bent pipe with Lukey Performance muffler

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 Post subject: Re: LOW SPEED JERKINESS AFTER MANUAL CONVERSION
Posted: Thu Nov 06, 2014 12:47 pm 
Parts Gopher
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Posts: 93

Joined: 1st Oct 2011

Location: sydney
NSW, Australia

Good to hear yours is fixed and going well.

Ive contacted Jason at T I Performance in regards to getting a chip made for the mods I have done and hopefully to fix this issue, Jason is away at the moment according to there reply email so once hes back il get it organised.

il keep everyone updated on the outcome.

Cheers for the helpful replies.

 

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