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06-15-2007, 12:40 PM | #1 |
Scooby Specialist
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XPT mapped VF34 not hitting target boost
Hey guys I just installed a P&Ped, coated vf34 in my wrx. I flashed an XPT map to my car via openecu. I was reading the pdf of stage 2 and it said you may need to turn the wastegate 3-5 turns to hit target boost, I wanted to know if it's the same with the 2.5 map.
When I shipped out my turbo to get the work done I lost my boost lines, the one with the pill to be specific... I ended up with a set but I don't know if it's a TD04 pill, I am probably gonna head over to the dealership today and grab it but I wanted to know what boost I'd be hitting if it was the wrong pill... I was hitting about .2kpa which is about 3 psi, it may be a combination of the pill and wastegate - opinions? Edit: I just read the GM boost solenoid is also part of the list, will that affect boost that much?
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Last edited by ptirmal; 06-15-2007 at 12:45 PM. |
06-15-2007, 01:08 PM | #2 | |
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Quote:
If your missing the pill on the stock solenoid you will hit WG boost which should be around 7 psi Yes, it will affect boost (the GM solenoid) and you will need a totally different boost map for that setup. Do not run the stg2 setup with the gm solenoid, your wgdc is going to be way too high |
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06-15-2007, 03:05 PM | #3 | |
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Quote:
I have a pill in there but not sure what pill it is... So is that why my boost is way low =(... |
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06-15-2007, 03:47 PM | #4 |
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if the map is tuned for a GM Solenoid, the map is running far less wastegate duty cycle than a stock solenoid would to acheive the same boost pressures. To be 100***37; honest with you, screw the stock solenoid and restrictor pill, go for a GM solenoid, you will be 100 times happier.
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06-15-2007, 04:01 PM | #5 |
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But i don't wanna spend anymore money! I plan on getting professionally tuned soon so is there anything I can do in the time being?
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06-15-2007, 04:02 PM | #6 |
Big Ron
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Post in the right forum.
DO NOT do anything else with your car until you get your knowledge base up. Open source tuning is great. Open source tuning without knowledge is DANGEROUS and you are obviously not ready for it. |
06-15-2007, 04:08 PM | #7 |
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Talk with ev8siv3 over on his web page but I have know doubt he will find you here.
Do you still have the stock BCS or the GM BCS? Which map did you buy the one for the GM BCS or the stock one? I think you will be very happy when it is all said and done but there are adjustments needed and ev8siv3 will help. |
06-16-2007, 11:55 PM | #8 |
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a GM BCS W/Pig tail is around $30. you will get much better boost response and control. could improve spool up as much as 500rpms.
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06-17-2007, 01:28 AM | #9 | ||
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I'll go ahead and buy it... Where the hell is it that cheap, I can't even find them for sale! |
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06-19-2007, 04:39 PM | #10 |
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06-19-2007, 09:47 PM | #11 |
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Thanks, already ordered mine. I found the thread but didn't see the post about where to find it.
Is it safe to drive around with this map without the GM boost solenoid? I don't know how the boost map affects the car/turbo even though it's only running 3psi... |
06-20-2007, 10:10 AM | #12 | |
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Quote:
Also you should at least be able to hit wastegate boost pressure. On the stock turbo that is about 7-8 PSI typically. Not sure what that number is on the vf34. |
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06-20-2007, 11:32 AM | #13 | |
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06-20-2007, 12:26 PM | #14 | |
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Quote:
While this will lower the boost you should be able to attain it shouldn't cause you to hit lower than wastegate pressure. The way wastegate works is that it opens/closes based on the pressure it sees on the vacuum line attached to it. If the pressure it sees is less than the wastegate spring pressure it will remain closed. If it sees enough pressure to overcome the spring tension (7-8 psi on stock turbo) it opens. What the BCS does is to regulate the pressure that the wastegate sees. It does this by bleeding the pressure seen at the compressor back into the intake (for stock bcs) so that the wastegate only sees a portion of the compressor pressure. What this means is that the bcs can only reduce the pressure seen at the wastegate and it really can't do much if anything about boost when you are below wastegate pressure. You could hook a vacuum line straight from the compressor outlet to the wastegate and you still should see 7-8 psi of boost. One caveat, the wastegate isn't an on/off switch. It may start to crack open at slightly lower pressures than 7-8psi. 3psi seems low however. There is a doc out there by Cobb that explains (much better than I am able I am sure) the stock boost control system. Check out this link for more details: http://www.cobbforums.com/forums/showthread.php?t=31625 |
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06-20-2007, 01:04 PM | #15 |
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well I guess I'll wait and see what happens when my GM solenoid shows up.
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