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Performance Modifications for the 9000 This forum contains PERFORMANCE related Q&A's for the Saab 9000. This may also include suspension.

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Old 11-19-2009, 04:53 PM   #361
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umm, base boost eh. I though that the EVO ran at about 14PSI standard
Where did you measure the base boost?

Too much normaly will throw the rings out, this is not what I see on yours.

Cheers
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Old 11-19-2009, 04:58 PM   #362
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Quote:
Originally Posted by dennis with bad 9k View Post
umm, base boost eh. I though that the EVO ran at about 14PSI standard
Where did you measure the base boost?

Too much normaly will throw the rings out, this is not what I see on yours.

Cheers

Wait, did I miss the part where we are talking about an EVO here?

Paul
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Old 11-19-2009, 05:01 PM   #363
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But Paul, all turbo motors are the SAME!


Duh!
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Old 11-19-2009, 05:08 PM   #364
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Indeed, haha, they're all the same. It's just a spinny blade thingy right?
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Old 11-19-2009, 06:24 PM   #365
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The issue is that 14 PSI is not all that high, as it is just under 1 bar. Warning bells start to sound in my head around 1.3 bar

What I am suggesting here is that Sweedspeed is on the right track, high levels of performance from an older engine can equal trouble
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Old 11-19-2009, 06:32 PM   #366
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You are comparing apples to oranges.
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Old 11-19-2009, 09:17 PM   #367
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Yes it does adjust for base boost being set too high. Unfortunately, it was high enough where even Trionic was unable to adapt to the situation. AKA way too high.
Just a thought here. I have had shops check fuel pressure and then learn they only check it at idle and say, yup its 43.5psi, the fuel pressure is fine.

The only way to really know what is going on is to log fuel pressure under load at wot. I have had issues where fuel pressure was fine all the way up to about 20psi of boost pressure and then as the boost pressure went above 20psi, the fuel pressure would fall off and go back the other way and I had a fuel pump that was fine until 20psi and held 65psi of fuel pressure, but by 25psi of boost pressure, the fuel pressure would fall off to 40psi and my car would lean out.

That is when I got rid of the stock fuel pump and went to the walbro 255.

Glad you got it running again!

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Old 11-20-2009, 08:03 AM   #368
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John,

I hadn't heard that before, thanks for putting the #'s.

Eric, you can also do a flow test on the pump, we have seen pumps supply the correct pressure despite clotted areas in the system, but they won't flow the right volume. I will have to look and see what the flow spec is, it's not hard to check either.

Best,
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Old 11-20-2009, 08:36 AM   #369
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so eric is it nice to have your car back?
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Old 11-20-2009, 08:38 AM   #370
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if there is the correct amount of pressure in the rail wouldnt that mean there is enough fuel to feed the injectors?...if fuel flow was insuffcient wouldnt the pressure drop in the rail?
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Old 11-20-2009, 08:56 AM   #371
 
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if there is the correct amount of pressure in the rail wouldnt that mean there is enough fuel to feed the injectors?...if fuel flow was insuffcient wouldnt the pressure drop in the rail?
Water sucked through a straw = high pressure, low volume
Water sucked through a hose = low pressure, high volume
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Old 11-20-2009, 09:16 AM   #372
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i know that and understand that, but im saying if the line is clogged up before the rail then there would be high pressure at the clog and lower pressure after the clog meaning the rail would have a loss of pressure, is that not correct?

pressure is created by resistance to flow if im not mistaken

so if flow is reduced before the rail then pressure would be lower at the rail or not?

Im just trying to learn not be difficult
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Old 11-20-2009, 10:03 AM   #373
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so eric is it nice to have your car back?

Yesterday may as well have been Christmas morning, to put it simply
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Old 11-20-2009, 11:08 AM   #374
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Originally Posted by mike9000aero View Post
i know that and understand that, but im saying if the line is clogged up before the rail then there would be high pressure at the clog and lower pressure after the clog meaning the rail would have a loss of pressure, is that not correct?

pressure is created by resistance to flow if im not mistaken

so if flow is reduced before the rail then pressure would be lower at the rail or not?

Im just trying to learn not be difficult
The pressure could build at the rail while it is in low demand, but once demand is there if there is a lack of flow in the lines/filter/pump pressure at the rail could drop.

For example, the pressure reading on our water at the milking parlor is 35psi. When I turn on the "fire hose" (large volume water pump) to clean the parlor the pressure will drop to <10psi due to the large amout of water being used. Pressure was there, but I can out flow it and drop the pressure.
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Old 11-20-2009, 11:31 AM   #375
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Here is a plot from some of my testing.. The key to remember is fuel pressure it tied 1:1 to manifold pressure. The change here was to big injectors and tuned for the right air fuel. But at this low delivery pressure you have to over-request for fuel and the spray pattern suffers. You can catch this by calculating your BSFC at a few points and comparing.
"oilP" here is fuel pressure.
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Old 11-20-2009, 01:02 PM   #376
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The pressure could build at the rail while it is in low demand, but once demand is there if there is a lack of flow in the lines/filter/pump pressure at the rail could drop.

For example, the pressure reading on our water at the milking parlor is 35psi. When I turn on the "fire hose" (large volume water pump) to clean the parlor the pressure will drop to <10psi due to the large amout of water being used. Pressure was there, but I can out flow it and drop the pressure.
yeah thats basically what i was trying to say lol i really suck at explaining what i mean....so then really its like john (jzw) is saying, at idle it could be just fine, at wot full boost and 5000+ rpm the pressure at the rail should drop...if there is a clog or weak pump
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Old 11-20-2009, 02:14 PM   #377
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Yesterday may as well have been Christmas morning, to put it simply
i know the feeling!
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