Adv. Timing to 18 deg...Safe?
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Adv. Timing to 18 deg...Safe?
Planning on advancing the timing on my 98 ITR... basically stock but has intake/header...planning to put jdm 4-1 sometime in the year after my smog check 
Is this safe or has anyone had any problems with it at 18 deg?
Is this safe or has anyone had any problems with it at 18 deg?
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Re: Adv. Timing to 18 deg...Safe? (George Knighton)
Slightly lean-yes
pinging-Most likely No, unless you lug the engine.
You would be surprised if you have an adjustable fuel regulator and bumped up pressure a little bit. Dyno proven.
pinging-Most likely No, unless you lug the engine.
You would be surprised if you have an adjustable fuel regulator and bumped up pressure a little bit. Dyno proven.
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From: Weed Country, Holland, Netherlands
Re: Adv. Timing to 18 deg...Safe? (Willard)
I don't see how the ignition timing influences the A/F ratio.
And how can a header determine the A/F ratio??????
Can someone explain?
And how can a header determine the A/F ratio??????
Can someone explain?
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Re: Adv. Timing to 18 deg...Safe? (DutchITR1689)
I don't see how the ignition timing influences the A/F ratio.
And how can a header determine the A/F ratio??????
Can someone explain?
And how can a header determine the A/F ratio??????
Can someone explain?
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From: Weed Country, Holland, Netherlands
Re: Adv. Timing to 18 deg...Safe? (George Knighton)
Thanks for the explanation!! I understand that advancing the timing will produce a different mix of exhaust gasses, but it shouldn't affect the initial A/F ratio, right?
Doesn't the ECU run in Open Loop mode at full throttle. Meaning it ignores the O2 sensor for adjusting the A/F ratio? So, will resetting the ECU help when you put a different header on the engine??
Doesn't the ECU run in Open Loop mode at full throttle. Meaning it ignores the O2 sensor for adjusting the A/F ratio? So, will resetting the ECU help when you put a different header on the engine??
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From: Canada
Re: Adv. Timing to 18 deg...Safe? (DutchITR1689)
A header will lean out the A/F ratio (by a fraction only and not all the time) by the fact that it gives a better air flow in the engine. More air can escape through the exhaust so more air can come in for the same amount of fuel.
Advancing the ignition will not lean the A/F ratio ( I don't see how it could). I think people say that because it gives the same symptoms as a lean situation
EDIT: this is an answer to your first post. I'm a slow typer (typer...Type R...do you get it) I guess
[Modified by JPP, 8:50 AM 5/14/2002]
Advancing the ignition will not lean the A/F ratio ( I don't see how it could). I think people say that because it gives the same symptoms as a lean situation
EDIT: this is an answer to your first post. I'm a slow typer (typer...Type R...do you get it) I guess
[Modified by JPP, 8:50 AM 5/14/2002]
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From: Weed Country, Holland, Netherlands
Re: Adv. Timing to 18 deg...Safe? (JPP)
A header will lean out the A/F ratio (by a fraction only and not all the time) by the fact that it gives a better air flow in the engine. More air can escape through the exhaust so more air can come in for the same amount of fuel.
Advancing the ignition will not lean the A/F ratio ( I don't see how it could). I think people say that because it gives the same symptoms as a lean situation
Advancing the ignition will not lean the A/F ratio ( I don't see how it could). I think people say that because it gives the same symptoms as a lean situation
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From: Weed Country, Holland, Netherlands
Re: Adv. Timing to 18 deg...Safe? (George Knighton)
I really think that the computer's supposed to be making up for this in most cases these days, though.
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From: Canada
Re: Adv. Timing to 18 deg...Safe? (DutchITR1689)
Everytime you change something in the air/fuel delivery, you should reset the ECU so it can adapt. Of course there is a limit to what the ECU can do. Just a header will not give a problem to the ECU and it should readjust without problem.
If you are like me and are running Toda B and 310 injectors on the stock ECU it will get a little confused and wont be able to adjust (running way to rich) so I had to lower the fuel pressure to 35 psi (I need a little ECU/dyno tuning shortly).
If you are like me and are running Toda B and 310 injectors on the stock ECU it will get a little confused and wont be able to adjust (running way to rich) so I had to lower the fuel pressure to 35 psi (I need a little ECU/dyno tuning shortly).
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From: toronto, ontario, canada
Re: Adv. Timing to 18 deg...Safe? (JPP)
If you are like me and are running Toda B and 310 injectors on the stock ECU it will get a little confused and wont be able to adjust (running way to rich) so I had to lower the fuel pressure to 35 psi (I need a little ECU/dyno tuning shortly).
the reason i ask this is because i have mine set at 54psi but this is with the vacume line on. i am on stock injectors with advanced timming and exaust & cai
if i put it at 54psi with the vacum line off, my car feels way to slow and slugish
does anyone have some input for me??
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Re: Adv. Timing to 18 deg...Safe? (George Knighton)
93 octane and cool climate...
Seriously?
Seriously?
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From: Canada
Re: Adv. Timing to 18 deg...Safe? (macdaddy)
is that with the vacum line on or off??
the reason i ask this is because i have mine set at 54psi but this is with the vacume line on. i am on stock injectors with advanced timming and exaust & cai
if i put it at 54psi with the vacum line off, my car feels way to slow and slugish
does anyone have some input for me??
the reason i ask this is because i have mine set at 54psi but this is with the vacume line on. i am on stock injectors with advanced timming and exaust & cai
if i put it at 54psi with the vacum line off, my car feels way to slow and slugish
does anyone have some input for me??
If you want my opinion 54 psi with vaccum on means you are running around 65 psi with vaccum line off (if you have the B&M FPR, I think the maximum pressure it will give is 60 psi). Compare to the stock pressure (52 psi vaccum off) that seems a little high for just intake and header. Maybe your dynobutt is out of wack a little.
[Modified by JPP, 9:58 AM 5/14/2002]
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From: toronto, ontario, canada
Re: Adv. Timing to 18 deg...Safe? (JPP)
is that with the vacum line on or off??
the reason i ask this is because i have mine set at 54psi but this is with the vacume line on. i am on stock injectors with advanced timming and exaust & cai
if i put it at 54psi with the vacum line off, my car feels way to slow and slugish
does anyone have some input for me??
I am running 35 psi with vaccum line off. Keep in mind that I have 310 cc/min injectors VS 240 cc/min stock injectors. The stock ECU program would dumps to much fuel with stock pressure.
If you want my opinion 54 psi with vaccum on means you are running around 65 psi with vaccum line off (if you have the B&M FPR, I think the maximum pressure it will give is 60 psi). Compare to the stock pressure (52 psi vaccum off) that seems a little high for just intake and header. Maybe your dynobutt is out of wack a little.
[Modified by JPP, 9:58 AM 5/14/2002]
the reason i ask this is because i have mine set at 54psi but this is with the vacume line on. i am on stock injectors with advanced timming and exaust & cai
if i put it at 54psi with the vacum line off, my car feels way to slow and slugish
does anyone have some input for me??
I am running 35 psi with vaccum line off. Keep in mind that I have 310 cc/min injectors VS 240 cc/min stock injectors. The stock ECU program would dumps to much fuel with stock pressure.
If you want my opinion 54 psi with vaccum on means you are running around 65 psi with vaccum line off (if you have the B&M FPR, I think the maximum pressure it will give is 60 psi). Compare to the stock pressure (52 psi vaccum off) that seems a little high for just intake and header. Maybe your dynobutt is out of wack a little.
[Modified by JPP, 9:58 AM 5/14/2002]
i have inspected my plugs and they seem fine too, i have AEM pressure regulator and AEM fuel rail, but once again the car shows no sighn of running rich and feels realy pepy
do you think i can fu*k anything up??
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From: Canada
Re: Adv. Timing to 18 deg...Safe? (macdaddy)
the thing is that i have put it back to 54 vacum line off but it feel slow!
i have inspected my plugs and they seem fine too, i have AEM pressure regulator and AEM fuel rail, but once again the car shows no sighn of running rich and feels realy pepy
do you think i can fu*k anything up??
i have inspected my plugs and they seem fine too, i have AEM pressure regulator and AEM fuel rail, but once again the car shows no sighn of running rich and feels realy pepy
do you think i can fu*k anything up??
I never heard of anybody blowing up an engine because they were running to rich. Usually you would lose a little power (especially at lower RPM) and you would dirty up the engine/exhaust. Plus the car will be less economical. It is not always easy to do but to make sure you are at peak efficiency, you should test different fuel pressure on the dyno. It may seem more performant but...(then again maybe it is).
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