Fuel Pressure guage

1094 Views 6 Replies 2 Participants Last post by krautlvr, Aug 4, 2004

krautlvr

Discussion Starter · Aug 2, 2004

Does anyone know where you can hook up a fuel pressure guage on the 1.8T ( like a shrader valve). I just installed a Rising Rate Regulator and need to know what fuel pressure I am reading with out using the Vag-com. If anyone else is using the same regulator from Cartech how did you monitor your fuel pressure?

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Rusty

· #2 · Aug 2, 2004

A fuel pressure gauge or sending unit goes into the "send" line into the fuel rail.

See my Info Forum write-up: http://www.clubb5.com/forums/viewtopic.php?t=63042. The picture there shows exactly how I mounted the Cartech as well as the fuel pressure sending unit.

If you want to see the fuel pressure in the cockpit as you drive, I highly recommend the Nordskog "Street Series" gauges. Digital, with a high/low pressure memory, sending unit is about $50, gauge is about $50, lifetime warranty, great customer service.

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krautlvr

Discussion Starter · #3 · Aug 3, 2004

Rusty said:
A fuel pressure gauge or sending unit goes into the "send" line into the fuel rail.

See my Info Forum write-up: http://www.clubb5.com/forums/viewtopic.php?t=63042. The picture there shows exactly how I mounted the Cartech as well as the fuel pressure sending unit.

If you want to see the fuel pressure in the cockpit as you drive, I highly recommend the Nordskog "Street Series" gauges. Digital, with a high/low pressure memory, sending unit is about $50, gauge is about $50, lifetime warranty, great customer service.

I have another question rusty I ran the vacuum line oiff the same line I hooked my boost guage, now my boost guage will not register over 0 pressure, what is the deal? I would really like to talk to you more in depth about the FMU

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Rusty

· #4 · Aug 3, 2004

krautlvr said:
... I ran the vacuum line oiff the same line I hooked my boost guage, now my boost guage will not register over 0 pressure, what is the deal?

The vacuum line to the Cartech? That is exactly how mine is hooked up. You have a leak somewhere in that line, or you haven't installed the Cartech's "bleeder" line w/checkvalve yet, or something simple like that.

krautlvr said:
I would really like to talk to you more in depth about the FMU

Sure. PM me or we can do it here and others can learn, too. Would you also tell me what you are trying to accomplish with the Cartech (duh, extra fuel obviously, but what is the rest of your setup?)

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krautlvr

Discussion Starter · #5 · Aug 4, 2004

my setup

Well were do I start,

K04 turbo
K04 GIAC chip
GIAC trans chip
Custom 2.5" exhaust
EVOMS cold air intake
Forged DV
New beefed up Trans ( toasted last Trans)
Just purchased Iridium spark plugs from ECS Tuning(not here yet)

Went to Dyno after installing FMU(Rising Rate Regulator) and lost tons of Power due to over overfueling, tried to trim back, but it wasnt enough. Yesterday bypassed the FMU put a new Fuel line in and this morning my car wont start it sounds like it is flooded. Getting really pissed off at car about to trade it in for a truck or something. Somebody save me before I go crazy.

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Rusty

· #6 · Aug 4, 2004

Ouch!

The Cartech is a "touchy" unit - it's easy to get too much fuel. They provide a "reducer" with it - a little plastic thingie that you insert into your vacuum/boost line to restrict the flow. I have to use that, or else even on the minimum setting the Cartech delivers way too much fuel.

I gather from your mods that you are just using the Cartech to try and get a little bit richer under open loop/WOT. That is totally possible if you set it up right. Here's a good starting point:

1) use the reducer
2) back the adjusting screw out all the way
3) if you have the model with the adjustable onset, set it about the middle of it's range.

Can you tell me exactly which model of the Cartech you have? That will help.

Also - do you have a gauge yet? Unless you have lots of free dyno time, it is virtually impossible to tune fuel pressure w/o a gauge. And the "under-the-hood" gauges are only good for tuning your base fuel pressure. Since the Cartech only works under boost, and you only get boost under load, you need an in-cockpit gauge to monitor pressure under driving conditions.

Another way to get ballpark A/F w/o a dyno is Vag-Com logging block 031. Look at the rear O2 sensor voltage, under WOT in 3rd and 4th gear it should be .89-.91 volts. If you're getting .93, you are really too rich. Less than .87 is way too lean.

If you are still flooded, try the age-old trick of holding the throttle all the way open. At startup, this will get more air into the engine.

And what model is your car? If you have an AEB engine (cable-throttle), the K04 kits can be much improved with 310cc injectors, a 3 bar FPR, and the "PC16" file from GIAC: http://www.clubb5.com/forums/viewtopic.php?t=75829

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krautlvr

Discussion Starter · #7 · Aug 4, 2004

Ordered your suggestion with the Nordskog should be here in a couple days, and my car is a AEB, I tried buying your red tops when you were selling them but you deterred me from buying them, you said they were too much for my engine! I will try your age ole trick then the spark plugs are coming out for a cleaning. Man wish you lived close buy so we could meet up. Only person close is Sharky and he likes to charge buy the hour that gets expensive. thanks will talk to you azgain soon. :weirdo:

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