tuneability??

88Saleen · April 18th, 2009, 06:42 PM

hey guys i just put 24lb injectors, fuel pressure regulator, fuel pressure gauge, and a 75mm MAF calibrated to 24lb injectors. I have an edlebrock top end kit cam, heads, intake, (performer). what can i do for tuning my car. the fuel pressure is set to 40psi and timing is set to 14degrees advanced. it seems like maybe i should set it at 10 or so, but i have had people tell me that 14 degrees would be ok. so i am wondering what i can do to tune it with the stock computer.

1slo5.0 · April 18th, 2009, 07:03 PM

Originally Posted by 88Saleen

hey guys i just put 24lb injectors, fuel pressure regulator, fuel pressure gauge, and a 75mm MAF calibrated to 24lb injectors. I have an edlebrock top end kit cam, heads, intake, (performer). what can i do for tuning my car. the fuel pressure is set to 40psi and timing is set to 14degrees advanced. it seems like maybe i should set it at 10 or so, but i have had people tell me that 14 degrees would be ok. so i am wondering what i can do to tune it with the stock computer.

I'd turn the fuel pressure down to 36-38lbs. Make sure you set it with the vacuum line disconnected. 14-16 degrees is about right for timing depending on what the car likes and what gas you run in it. That is about all you can do is timing and fuel pressure.

93mustank · April 18th, 2009, 07:05 PM

Go to the track and tune it............

88Saleen · April 18th, 2009, 08:42 PM

well maybe i have a vacuum leak or something because it does not idle very well. just to test the MAF if i unplug it at idle should the car die?

88Saleen · April 18th, 2009, 08:44 PM

Originally Posted by Darrell

I'd turn the fuel pressure down to 36-38lbs. Make sure you set it with the vacuum line disconnected. 14-16 degrees is about right for timing depending on what the car likes and what gas you run in it. That is about all you can do is timing and fuel pressure.

i run 92 octane in it. and as for fuel pressure, when i put the vacuum line back on the pressure should drop to 36-38 or should i set the gauge to 36-38 before i put the vacuum line on? it seems to drop a few psi when you put the vacuum line on.

mxnate116 · April 18th, 2009, 11:07 PM

set the fuel pressure with the vac line off the whole time. then connect it when your done

2002BLGT · April 19th, 2009, 01:11 AM

Originally Posted by 88Saleen

i run 92 octane in it. and as for fuel pressure, when i put the vacuum line back on the pressure should drop to 36-38 or should i set the gauge to 36-38 before i put the vacuum line on? it seems to drop a few psi when you put the vacuum line on.

this is normal , vacuum off will show you what its at during wide open throttle , 39 is what the computer expects , if its loading up dropping down a lbs or 2 might help but you cant go too much or you might run lean under hard acceleration

88Saleen · April 19th, 2009, 10:57 AM

Originally Posted by 2002BLGT

this is normal , vacuum off will show you what its at during wide open throttle , 39 is what the computer expects , if its loading up dropping down a lbs or 2 might help but you cant go too much or you might run lean under hard acceleration

ok thanks.

1slo5.0 · April 20th, 2009, 02:00 PM

Originally Posted by 88Saleen

i run 92 octane in it. and as for fuel pressure, when i put the vacuum line back on the pressure should drop to 36-38 or should i set the gauge to 36-38 before i put the vacuum line on? it seems to drop a few psi when you put the vacuum line on.

Always set fuel pressure with the vacuum line off.

flattusmaximus78 · April 20th, 2009, 02:08 PM

Whats the diifference? I notice my fpr guage showed 30psi in my rail and my car had been lean lately. I cranked it to roughly 39psi while the car was running, and vac was on and what not, and it clearly made the car richer. It went from mid 12's to 10s at wot which is fine because I'm waiting on a retune.

1slo5.0 · April 20th, 2009, 02:10 PM

Originally Posted by flattusmaximus78

Whats the diifference? I notice my fpr guage showed 30psi in my rail and my car had been lean lately. I cranked it to roughly 39psi while the car was running, and vac was on and what not, and it clearly made the car richer. It went from mid 12's to 10s at wot which is fine because I'm waiting on a retune.

What's the difference for what?

flattusmaximus78 · April 20th, 2009, 02:15 PM

My vacuum was at 30psi with the car idling and running. I adjusted it to 39psi while idling and then I took it out for a spin and it seemed to add just the right amount of fuel as it riched out my afrs a ton under wide open throttle, but stayed the same for cruising speeds. What difference did it make that I didn't pull the vac line off?

1slo5.0 · April 20th, 2009, 04:18 PM

Originally Posted by flattusmaximus78

My vacuum was at 30psi with the car idling and running. I adjusted it to 39psi while idling and then I took it out for a spin and it seemed to add just the right amount of fuel as it riched out my afrs a ton under wide open throttle, but stayed the same for cruising speeds. What difference did it make that I didn't pull the vac line off?

You set the fuel pressure with the line off so you get an accurate setting. Any variance in vacuum changes the fuel pressure when the line is hooked up. That is how the fuel pressure adjusts for increased engine load. You aren't going to hurt anything adjusting it how you did, its just the improper way. 39psi with the vacuum line on is probably 45psi with it off and I'd be willing to bet you are a little on the rich side.

88Saleen · April 20th, 2009, 06:51 PM

ok, i set my fpr to 38-39psi with the vacuum line off, is that way to high?

flattusmaximus78 · April 20th, 2009, 11:11 PM

Originally Posted by Darrell

You set the fuel pressure with the line off so you get an accurate setting. Any variance in vacuum changes the fuel pressure when the line is hooked up. That is how the fuel pressure adjusts for increased engine load. You aren't going to hurt anything adjusting it how you did, its just the improper way. 39psi with the vacuum line on is probably 45psi with it off and I'd be willing to bet you are a little on the rich side.

Yeah u could say that lol. I'll pull the vac off and set it to 39 or so and see if she likes it.

Nice 5.0 · April 21st, 2009, 02:34 AM

Originally Posted by flattusmaximus78

Yeah u could say that lol. I'll pull the vac off and set it to 39 or so and see if she likes it.

You need a tune especially with your setup.

flyin ryan · April 21st, 2009, 02:45 AM

Originally Posted by 88Saleen

well maybe i have a vacuum leak or something because it does not idle very well. just to test the MAF if i unplug it at idle should the car die?

no it'll go into limp mode and run like shit and have no power

flattusmaximus78 · April 21st, 2009, 12:59 PM

I know I need a tune. It's been tuned for almsot two months now. I'm not that dumb. But my car kept going lean under some cruising and wot, when I noticed my fpr was set so low. Cranked it up to 40, and now I had to put my stock tb on cause of some other issues. So basically I added a bunch of fuel, and took aways a bunch of air. RICHNESSS

1slo5.0 · April 21st, 2009, 01:07 PM

Originally Posted by flattusmaximus78

I know I need a tune. It's been tuned for almsot two months now. I'm not that dumb. But my car kept going lean under some cruising and wot, when I noticed my fpr was set so low. Cranked it up to 40, and now I had to put my stock tb on cause of some other issues. So basically I added a bunch of fuel, and took aways a bunch of air. RICHNESSS

Not necessarily. That is the beauty of EFI, your MAF is measuring the air coming in and adjusting the fuel accordingly.

Why did you think it was going lean anyway? Forgive me if I forgot some of the facts, I know you made mention of these problems in another thread.

flattusmaximus78 · April 21st, 2009, 01:15 PM

Well to start from the beginning. I got a tune... on the dyno. It was great and I loved it. The thought of having no guages in the car scared me. So I got a aem wideband. And at wot is was 10.3 to 10.6 depending on what gear I was in. So I brought it to my tuner so he could pull some fuel out. He did, not on the dyno but nothing to crazy so it wasn't safe. It was decent enough. Then I started seeing 12.7 at wot, and it would go lean during cruising if I was to low in a gear and pop occasionly and hesitate. So I was doing tb work when I noticed my fuel pressure was at 30 psi. All the retuning he did was based off of 40psi plus. So Since I had all this missing fuel it in the end went lean. I cranked it up to 40, and had to put the stock tb on, and now under cruising it drives smooth as butter, never goes lean, but ovbiously my wot is 10.000 and off the guage from so much fuel.

April 18th, 2009, 06:42 PM	#1
88Saleen Regular 1988 Mustang Join Date: Apr 2008 Location: Lima, Ohio or Grand Blanc, Michigan Posts: 185	tuneability?? hey guys i just put 24lb injectors, fuel pressure regulator, fuel pressure gauge, and a 75mm MAF calibrated to 24lb injectors. I have an edlebrock top end kit cam, heads, intake, (performer). what can i do for tuning my car. the fuel pressure is set to 40psi and timing is set to 14degrees advanced. it seems like maybe i should set it at 10 or so, but i have had people tell me that 14 degrees would be ok. so i am wondering what i can do to tune it with the stock computer.

April 18th, 2009, 07:05 PM	#3
93mustank Hardcore Enthusiast Join Date: Aug 2008 Location: Phoenix,AZ Posts: 2,046	Go to the track and tune it............ __________________ "Velocity is better than over all air flow." PeteAndersonRacing.com

April 20th, 2009, 02:08 PM	#10
flattusmaximus78 MM Fanatic 1993 5.ohhhh 14.47 at 96 mph Join Date: Apr 2006 Location: Gatorland Posts: 4,450	Whats the diifference? I notice my fpr guage showed 30psi in my rail and my car had been lean lately. I cranked it to roughly 39psi while the car was running, and vac was on and what not, and it clearly made the car richer. It went from mid 12's to 10s at wot which is fine because I'm waiting on a retune. __________________ exploder top end with 12 psi of v-tech

April 20th, 2009, 02:15 PM	#12
flattusmaximus78 MM Fanatic 1993 5.ohhhh 14.47 at 96 mph Join Date: Apr 2006 Location: Gatorland Posts: 4,450	My vacuum was at 30psi with the car idling and running. I adjusted it to 39psi while idling and then I took it out for a spin and it seemed to add just the right amount of fuel as it riched out my afrs a ton under wide open throttle, but stayed the same for cruising speeds. What difference did it make that I didn't pull the vac line off? __________________ exploder top end with 12 psi of v-tech

April 21st, 2009, 12:59 PM	#18
flattusmaximus78 MM Fanatic 1993 5.ohhhh 14.47 at 96 mph Join Date: Apr 2006 Location: Gatorland Posts: 4,450	I know I need a tune. It's been tuned for almsot two months now. I'm not that dumb. But my car kept going lean under some cruising and wot, when I noticed my fpr was set so low. Cranked it up to 40, and now I had to put my stock tb on cause of some other issues. So basically I added a bunch of fuel, and took aways a bunch of air. RICHNESSS __________________ exploder top end with 12 psi of v-tech

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April 18th, 2009, 08:42 PM	#4
88Saleen Regular 1988 Mustang Join Date: Apr 2008 Location: Lima, Ohio or Grand Blanc, Michigan Posts: 185	well maybe i have a vacuum leak or something because it does not idle very well. just to test the MAF if i unplug it at idle should the car die?

April 18th, 2009, 11:07 PM	#6
mxnate116 Enthusiast 88 mustang GT Join Date: Jun 2007 Location: Spokane, WA Posts: 751	set the fuel pressure with the vac line off the whole time. then connect it when your done

April 20th, 2009, 06:51 PM	#14
88Saleen Regular 1988 Mustang Join Date: Apr 2008 Location: Lima, Ohio or Grand Blanc, Michigan Posts: 185	ok, i set my fpr to 38-39psi with the vacuum line off, is that way to high?

April 21st, 2009, 01:15 PM	#20
flattusmaximus78 MM Fanatic 1993 5.ohhhh 14.47 at 96 mph Join Date: Apr 2006 Location: Gatorland Posts: 4,450	Well to start from the beginning. I got a tune... on the dyno. It was great and I loved it. The thought of having no guages in the car scared me. So I got a aem wideband. And at wot is was 10.3 to 10.6 depending on what gear I was in. So I brought it to my tuner so he could pull some fuel out. He did, not on the dyno but nothing to crazy so it wasn't safe. It was decent enough. Then I started seeing 12.7 at wot, and it would go lean during cruising if I was to low in a gear and pop occasionly and hesitate. So I was doing tb work when I noticed my fuel pressure was at 30 psi. All the retuning he did was based off of 40psi plus. So Since I had all this missing fuel it in the end went lean. I cranked it up to 40, and had to put the stock tb on, and now under cruising it drives smooth as butter, never goes lean, but ovbiously my wot is 10.000 and off the guage from so much fuel. __________________ exploder top end with 12 psi of v-tech

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