Is there a recommended base timing number for a MILE HIGH?
'87 B2k base ignition timing at altitude.
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whalepirot
- 1-PSI
- Posts: 11
- Joined: Fri Nov 21, 2008 1:28 pm
'87 B2k base ignition timing at altitude.
The gereral rule is +1*/1000".
Is there a recommended base timing number for a MILE HIGH?
Is there a recommended base timing number for a MILE HIGH?
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whalepirot
- 1-PSI
- Posts: 11
- Joined: Fri Nov 21, 2008 1:28 pm
Re: '87 B2k base ignition timing at altitude.
Kinda sad about no replies, but.....
Callaway's service supplement states 2*ATDC but has nothing on adjustments for high altitude.
Side note: 100+ octane boost [w/89LL] had no noticable effect on performance. Never sensed any detonation w/ or w/o it.
With many varied and somewhat frequent Codes, 42+43, I recall, plus similar cycling of O/D, this is puzzling. OBD I is so limited in info.
On my previous [modified] C4, I cured an O/D cycling issue [highway speed, level w/ CC-on] by installing new plug wires. While the 'experts' may cry "no way", that was the sole change and the problem never recurred. I suspect the engine was running on the edge of open/closed loop, due to the sometimes too-rich exhaust, from incomplete fuel burn with a weak wire or two. That early C4 would accelerate with any C6 Z06.
This B2k has only 20k on the odo.
I'm considering a new O2 sensor, but have learned that if there is a fouling exhaust, any improvement will be transitory, as the new unit gets fouled. I once fixed a fouled sensor with a propane torch, burning off the excess carbon.
Callaway's service supplement states 2*ATDC but has nothing on adjustments for high altitude.
Side note: 100+ octane boost [w/89LL] had no noticable effect on performance. Never sensed any detonation w/ or w/o it.
With many varied and somewhat frequent Codes, 42+43, I recall, plus similar cycling of O/D, this is puzzling. OBD I is so limited in info.
On my previous [modified] C4, I cured an O/D cycling issue [highway speed, level w/ CC-on] by installing new plug wires. While the 'experts' may cry "no way", that was the sole change and the problem never recurred. I suspect the engine was running on the edge of open/closed loop, due to the sometimes too-rich exhaust, from incomplete fuel burn with a weak wire or two. That early C4 would accelerate with any C6 Z06.
This B2k has only 20k on the odo.
I'm considering a new O2 sensor, but have learned that if there is a fouling exhaust, any improvement will be transitory, as the new unit gets fouled. I once fixed a fouled sensor with a propane torch, burning off the excess carbon.
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SurfnSun
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Re: '87 B2k base ignition timing at altitude.
The best thing to do would be to call Callaway Cars and see if they have a recommendation.
I don’t have any help to give on this one.
In the stock configuration, the car will run very well on pump gas. It wasn’t until I added additional boost that I realized the benefit from high octane fuel. The real problem is that high octane fuel has poor drivability at low speed due to the low compression of the engine.
At this point going through all the small parts, like the O2 , is never a bad idea, simply due to age, and not knowing how it was treated prior to your ownership.
I don’t have any help to give on this one.
In the stock configuration, the car will run very well on pump gas. It wasn’t until I added additional boost that I realized the benefit from high octane fuel. The real problem is that high octane fuel has poor drivability at low speed due to the low compression of the engine.
At this point going through all the small parts, like the O2 , is never a bad idea, simply due to age, and not knowing how it was treated prior to your ownership.