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 Old 02-22-2009, 03:19 PM   #1
 
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Default q"s for all big turbo disi cars

Whats the most boost you can run before the tp closes? i'm still trying to diagnose my cut issue and i'm cutting at 15.xx psi but i can't boost more because the car falls on its face. I know this has been killed on the forums but i can't find it written out...cut and dry.
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 Old 02-22-2009, 04:18 PM   #2
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sorry if you've covered this in another thread. but have you tried getting the cp-e fuel cut flash? my friend with a bt ms6 couldn't go WOT in 3rd gear for the longest time because of the cut - no more cut after getting the new cp-e flash.
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 Old 02-22-2009, 06:15 PM   #3

 
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i personally havent had any fuel cut issues. 17psi on a 3071r... havent hit fuel cut once.

dont know how to help you.

Your using a standback right?

whats your fueling/timing maps look like?
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 Old 02-23-2009, 01:47 AM   #4
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I am not at all sure that the throttle plate and fuel are related, if you have a SB and the 3.5" maf and I am going to assume the ECU flash to go with it and a CDFP... you shouldnt be cutting at 15psi unless something is set wrong.
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 Old 02-23-2009, 05:23 AM   #5

 
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im not sure if hes running the 3.25" maf housing or the big maf flash just yet... but ill let him throw that one out there.
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 Old 02-23-2009, 06:06 AM   #6
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Originally Posted by 06Speed6 View Post
I am not at all sure that the throttle plate and fuel are related, if you have a SB and the 3.5" maf and I am going to assume the ECU flash to go with it and a CDFP... you shouldnt be cutting at 15psi unless something is set wrong.
Only time I've seen throttle plate and fuel related is when there's fuel pressure drop the the stock ecu closes the TP automatically.

Honestly if your car is falling on its face that means your out of fuel for some reason or your TP is down to like 50% and lower. since a bigger turbo has power later in the rpm band plus the fact you have the ecu butt fucking you by closing the plate around 5600 rpms and up your car feels lethargic.
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 Old 02-23-2009, 06:55 AM   #7
 
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Ecu is out for the flash. i'm running the perrin so I have to scale the boost in standback. right now in the standback i'm at 29 and 31 lbs my biggest problem is the minimum boost i suppose to be running is 1.1 bar...so like 16.5 lbs. just tell what to log in the dashhawk to diagnose this problem and i'll do it.
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 Old 02-23-2009, 10:51 AM   #8
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well let us know if you're still having problems post-flash.
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 Old 02-23-2009, 11:20 AM   #9
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Dont log with the dashhawk, that is your first problem. Log with the standback.
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 Old 02-23-2009, 11:26 AM   #10
 
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I don't understand the problem you're having. We installed the Perrin ECBS on a client's car recently and had no issues with the scaling of boost using the standback, eg. 15 psi = 15 psi. The PID parameters are different but that doesn't fit the scenario you're describing. The TP closure is eliminated with the fuel cut flash. Otherwise, numerous factors will cause it to close.
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