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Longer cranking time 

 

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 Post subject: Longer cranking time
Posted: Tue Dec 13, 2011 12:48 pm 
Fordmods Newbie
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Age: 43

Posts: 3

Joined: 16th Aug 2011

Ride: Ford BFII XR8

Location: Sydney
NSW, Australia

hi, i have noticed that if i go from using 91 ron to 98 ron, my cranking time will increase by about 2-3 seconds.

running on 91, it will take about 1-1.5 sec to fire up but with 98 it will take about 3-3.5 sec to fire.

just want to know if any one else is having the same problem & what could possibly be causing it.

Cheers.

BF2 XR8 6spd auto
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 Post subject: Re: Longer cranking time
Posted: Wed Dec 14, 2011 12:43 pm 
EFI Guru
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Ride: 351 Vogue,XH 5.0,'17 5.0 Stang

Location: Perth
WA, Australia

It most likely has everything to do with the octane level of the fuel. 98 is slower burning therefore it takes longer to fire especially on crank when dynamic compression is low. A reflash to increase your base timing will likely improve the situation which, with 9.5:1 should be fairly high on your list of mods to do.
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 Post subject: Re: Longer cranking time
Posted: Wed Dec 14, 2011 12:51 pm 
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Age: 43

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Joined: 16th Aug 2011

Ride: Ford BFII XR8

Location: Sydney
NSW, Australia

cheers XR9ute.

i have a SCT X3 running on the 'generic' 98 tune (which makes no difference to cranking time vs stock tune).
there are some spark settings in there, will adjusting these help at all?
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 Post subject: Re: Longer cranking time
Posted: Wed Dec 14, 2011 1:13 pm 
EFI Guru
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Ride: 351 Vogue,XH 5.0,'17 5.0 Stang

Location: Perth
WA, Australia

ABXR8 wrote:
cheers XR9ute.

i have a SCT X3 running on the 'generic' 98 tune (which makes no difference to cranking time vs stock tune).
there are some spark settings in there, will adjusting these help at all?


No wuckers.
If they have a cranking spark table you could adjust that up a coupla degrees.
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