MAX BOOST ON PUMP GAS
#3
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With the right timing, fuel delivery intake charge temp I have run as high as 20 psi on pump gas. Adjusted the timing and fuel and lost a few hp.
I have run a complete DE weekend at 18 psi on pump gas with no problems. That was with a dyno tuned Tec3 program.
Alan
I have run a complete DE weekend at 18 psi on pump gas with no problems. That was with a dyno tuned Tec3 program.
Alan
#4
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Alan, what's the most timing retard you have run? I too have run 20psi on pump fuel, but at a total ignition advance of 9. At this level, EGT's must be through the roof (I have no EGT meter). The car's fast, but i dunno how reliable it is =).
At total ignition advance of 18, I can do 13-14 psi depending on air temperature. I think a bigger intercooler should be my next upgrade, allowing more boost on pump fuel.
Curious, what octane is your pump fuel? Mine's 91 octane. Some stations offer 92 octane, but I have yet to see a difference between the two.
At total ignition advance of 18, I can do 13-14 psi depending on air temperature. I think a bigger intercooler should be my next upgrade, allowing more boost on pump fuel.
Curious, what octane is your pump fuel? Mine's 91 octane. Some stations offer 92 octane, but I have yet to see a difference between the two.
#5
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alan c. do you think i can get 18lbs boost on a dyno tuned maf ? pump gas , stage 3 sfr turbo,52lbs.injectors,46mm tial wastegate,stock head and lower half.
#7
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i think the best way of making lot of hp is the turbo. we need a turbo that can spool quickle and give us a high rate of cfm at low psi to keep us in the safe zone . dose anybody agree.
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#8
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Can someone explain how ignition advance works to increase performance, decrease preignition, etc. I've always been confused with this. Is there a way to change the timing with the stock DME? I do have fuel adjustablility with my ARCII, but the computer handles the timing?
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#9
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Rage,
I,m running 19 degrees on 100 ocatane at 21 psi. I ran 17 degrees on pump gas,93 octane, at 18 psi.
At 3400 - 6850 rpm it looks like this for 100 octane:
Boost/Advance Deg.
0/36
2.7/34
4.9/32
7.1/30
9.2/28
11.4/25
13.6/23
15.8/21
17.9/20
20.1/19
22.0/19
Fuel pressure static set at 43 psi for 0 boost. Pressure rasies 1:1. 83 lb. injectors pushed by a big Weldon pump. Tec3 management.
I,m running 19 degrees on 100 ocatane at 21 psi. I ran 17 degrees on pump gas,93 octane, at 18 psi.
At 3400 - 6850 rpm it looks like this for 100 octane:
Boost/Advance Deg.
0/36
2.7/34
4.9/32
7.1/30
9.2/28
11.4/25
13.6/23
15.8/21
17.9/20
20.1/19
22.0/19
Fuel pressure static set at 43 psi for 0 boost. Pressure rasies 1:1. 83 lb. injectors pushed by a big Weldon pump. Tec3 management.
#10
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[quote]Originally posted by jimbo1111:
<strong>i think the best way of making lot of hp is the turbo. we need a turbo that can spool quickle and give us a high rate of cfm at low psi to keep us in the safe zone . dose anybody agree.</strong><hr></blockquote>
No
<strong>i think the best way of making lot of hp is the turbo. we need a turbo that can spool quickle and give us a high rate of cfm at low psi to keep us in the safe zone . dose anybody agree.</strong><hr></blockquote>
No
#11
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Jimbo1111,
I think you can get 18 with your setup. I would put it on a dyno and look at the air fuel to be sure. Watch the A/F on the dyno while doing the run. I use a post-it note with an arrow to indicate on the monitor where I want to abort the run if it goes lean.
Alan
I think you can get 18 with your setup. I would put it on a dyno and look at the air fuel to be sure. Watch the A/F on the dyno while doing the run. I use a post-it note with an arrow to indicate on the monitor where I want to abort the run if it goes lean.
Alan
#12
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jimbo1111,
If you flow more at lower pressures to get to the same hp you still need fuel. To flow more at a given psi you need to upgrade: head, IC, intake, exhaust and THEN match that to a turbo.
You could do it a piece at a time but you would still leave a botle neck each time.
Depends on what you want to do. There are a lot of really fun 280 - 300hp 951's out there. They last and don't kill the budget. Products from Danno, Tim, John, Lindsey to name a few.
Alan
If you flow more at lower pressures to get to the same hp you still need fuel. To flow more at a given psi you need to upgrade: head, IC, intake, exhaust and THEN match that to a turbo.
You could do it a piece at a time but you would still leave a botle neck each time.
Depends on what you want to do. There are a lot of really fun 280 - 300hp 951's out there. They last and don't kill the budget. Products from Danno, Tim, John, Lindsey to name a few.
Alan
#13
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thanks alan . is it true that i sould start out rich and then start to lean the mixture to get the proper 12to1 a/f and at what rpm sould i see 12:1 a/f. i don't think a maf is designed to give me a 12:1 a/f mixture through the whole rpm range .i think i'll be rich till the higher rpm then start to lean out. what do you think and what sould i do.
#14
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[quote]Can someone explain how ignition advance works to increase performance, decrease preignition, etc. <hr></blockquote>
David, try reading these two tech pages form the SDS website. They're pretty informative.<a href="http://www.sdsefi.com/techcomb.htm" target="_blank">Ignition and Combustion</a><a href="http://www.sdsefi.com/techocta.htm" target="_blank">Horsepower and Octane</a>
[quote] Is there a way to change the timing with the stock DME? <hr></blockquote>
Yes, with the fuel quality switch, but it's not really useful (in most instances) as a performance enhancer.
[quote] I do have fuel adjustablility with my ARCII, but the computer handles the timing? <hr></blockquote>
Yup.
David, try reading these two tech pages form the SDS website. They're pretty informative.<a href="http://www.sdsefi.com/techcomb.htm" target="_blank">Ignition and Combustion</a><a href="http://www.sdsefi.com/techocta.htm" target="_blank">Horsepower and Octane</a>
[quote] Is there a way to change the timing with the stock DME? <hr></blockquote>
Yes, with the fuel quality switch, but it's not really useful (in most instances) as a performance enhancer.
[quote] I do have fuel adjustablility with my ARCII, but the computer handles the timing? <hr></blockquote>
Yup.
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#15
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Completely stock except boost set @ 19psi, turbo back open exaust (3 inch) intake and europroducts chips. No problems in almost 5k miles. There's a loss of power issue at the moment but it's doesn't appear to be internal.
Ahmet
Ahmet