Fine-Tuning Idle and Cruising
08-25-2005, 11:05 PM
#31
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Nice Frank,
I intend to disconnect my o2 while tuning PT maps (on my todo list
)
The dyno A/F seems generally richer than your personal wideband results posted, whats happening there.
I might try the lean idle idea as mentioned by Special Tool also, petrol is getting expensive!
I intend to disconnect my o2 while tuning PT maps (on my todo list
)The dyno A/F seems generally richer than your personal wideband results posted, whats happening there.
I might try the lean idle idea as mentioned by Special Tool also, petrol is getting expensive!
08-26-2005, 04:51 AM
#32
Pro
Thread Starter
Originally Posted by hally
Nice Frank,
I intend to disconnect my o2 while tuning PT maps (on my todo list )
The dyno A/F seems generally richer than your personal wideband results posted, whats happening there.
I intend to disconnect my o2 while tuning PT maps (on my todo list
)The dyno A/F seems generally richer than your personal wideband results posted, whats happening there.
I will make another graph from my zeitronix log today. This one will be different from the dyno sheet from next week simply because I have been changing the AFR again and again.
08-26-2005, 12:13 PM
#33
Rennlist Member
Special Tool,
your idle is at 18 to 1 AFR!?
Don't you have a more aggressive cam? Probably more overlap, no doubt.
This would mean less vacuum at idle. Therefore, bad intake fuel mixing, exhaust gas dilution, etc.
I would find it hard to believe you can run it that lean, unless you have like 1400 RPM idle.
your idle is at 18 to 1 AFR!?
Don't you have a more aggressive cam? Probably more overlap, no doubt.
This would mean less vacuum at idle. Therefore, bad intake fuel mixing, exhaust gas dilution, etc.
I would find it hard to believe you can run it that lean, unless you have like 1400 RPM idle.
08-27-2005, 01:50 PM
#34
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You may get better results with a 1.8 resistor in place (altitude senor). That way your oxygen senor can send a signal for your air/ fuel ratio gauge and the [!] light stays off
08-27-2005, 07:05 PM
#35
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Thread Starter
I was having a problem maintaining 15 psi boost untill 6000 rpm. I have been using the ReliaBoost with a dual port wastegate (but configured using only one of the ports). My boost started dropping at around 4750 rpm from 15 psi to app. 11 psi at 6000 rpm.
I have replaced the ReliaBoost with a T-style manual boost controller and hooked it up to the wastegate using both ports. Now the boost drops very little at app. 5700 rpm. It seems that I have found a flock of horses in that wastegate!
Going back to the dyno very soon!
I have replaced the ReliaBoost with a T-style manual boost controller and hooked it up to the wastegate using both ports. Now the boost drops very little at app. 5700 rpm. It seems that I have found a flock of horses in that wastegate!
Going back to the dyno very soon!
08-27-2005, 07:56 PM
#36
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You may get better results with a 1.8 resistor in place (altitude senor). That way your oxygen senor can send a signal for your air/ fuel ratio gauge and the [!] light stays off
08-27-2005, 09:13 PM
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Originally Posted by eniac
Where exactly does the resistor go? Does this make the DME ignore the O2 then?
The resistor puts the DME in open loop operation (it ignores the O2 sensor and runs straight of the maps) and at the same time it switches to another set of fuel and ignition maps.
