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13C's low boost stock everything else?

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761 views 5 replies 5 participants last post by  VR4-mike  
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#1 ·
As you may have seen from my other threads, there's some weird stuff going on with my vr4 right now regarding fueling and boost control and possibly ignition.

Since this car is new to me and it could have more than one or two specific problems with the current MBC and inline fuel pump setup..., I want to try to get furthest back to stock as I can and hopefully discover/solve problems in the process. The major bump in that road is my car came with 13C's.

Is it possible to run 13C's with low - even wastegate boost with the stock fuel setup? Right now without an MBC I see the boost get up to about 5-7 psi. IIRC stock 92 levels should be ~9 psi if the boost control solenoid is working properly. Not sure why that is happening. I guess replacing the stock boost control a good manual boost control system is necessary regardless...I have a crappy bleeder mbc right now that I'm having terrible luck with...see other thread :rolleyes:

I'm not good at comparing turbos yet. Different turbos move different amounts of air in a particular system at the same amount of boost, right? Can't you run 9b's at about 12-14 psi without needing any fuel upgrades? So how would the amount of air being pushed by 13C's at ~7-9 psi be compared the air being pushed by 9b's at 12-14 psi?

I don't need any links to web pages describing how turbo systems work. I've been reading up but would like some clarification from those with more knowledge than me.
 
#3 ·
Sounds like you should be in the clear as far as the stock fuel system goes. Just keep the boost down to wastegate pressure, or even a little higher and you'll be fine. Also, do you have any way to datalog? If so, take a look at your IDC's to see how far the 13c's are pushing your injectors at any given amount of boost. Also try to monitor knock if you can, and back off the boost a bit if you get too high on the knock count ;) hope this helps, and good luck with finding out all the problems! :beer:
 
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#4 ·
Awesome. I'm glad I can remove that fuel pump for now and not worry about it. A previous owner included a datalogger cable and a palm IIIc, I just have to get the palm harness so I can use the datalogger function.
 
#5 ·
+1, You're definitely fine at low boost. I've been running my 16T's on the stock fuel system (even fuel pump not hot-wired) at wastegate boost while I get everything else dialed in and I'm not seeing more than 70-80 percent duty cycles.
 
#6 ·
You and me both. Im running 13Cs with stock fuel. Ive been trying to keep the boost down. After I put the FMIC in my boost went to about 15 psi. I dont think I heard knocking, but I would feel more comfortable running like 11 psi untill I get my 550cc.
 
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