[RESOLVED] 420a turbo question fuel cut

[gsgoingturbo]

Ok, first here is my setup.

Treadstone manifold
Aeromotive FPR (idle fp set to 55)
Garrett T3 turbo
ApexI bov
Tial wastegate (spring set at 6psi)
FMIC
injectors stock
no fmu
no fcd and/or missinglink


Question: The car will boost and get about 4psi and then I hit fuel cut. My wide open throttle fuel pressure spikes to about 65. Also, I'll get the "check engine light" after pushing the fuel further. Pretty sure that's the MAP sensor. I just got the car done over the weekend and haven't recieved my SAFC yet. Other than all that my car is running great, just no boosting (boo). I'm wondering if all I need to get now is a missinglink or a FCD?

I've been looking at different threads for a couple days, but haven't really found the answer or a setup like this. Most others have a FMU. Is that something else I would need? I'm asking because I've read somewhere that with the AFPR the FMU wasn't needed.

Please help.

 

[rstare]

You NEED a 12:1 fmu; it's that simple. You need an FCD. You don't need that AFPR. Use your stock fpr in conjunction with the fmu. Don't boost or you will run super lean and your engine will be toast. You don't need and SAFC.
Sounds like you should have done a little more research before jumping into this.
Your getting things between the 4g63 and the 420a mixed up.

 

[gsgoingturbo]

Any problem with keeping the AFPR?

 

[rstare]

You don't need it at all... it shouldn't have any ill effects on anything.

 

[VelocitàPaola]

Any problem with keeping the AFPR?

No, but you might use a 10:1 disk instead of the 12:1 disk if you'll be keeping the 1:1 AFPR.

 

[gsgoingturbo]

Ok guys, thanks alot. You can mark this one as resolved. One final thing... 10:1 or 12:1

 

[rstare]

12:1.
Why would you need a 10:1 Paul?
The regulators increase fuel pressure by restricting the line. It would seem to me that the biggest restriction is the only restriction that would do anything. Which would make the 1:1 do nothing...
I could be wrong in my theory though, just let me know.

 

[VelocitàPaola]

12:1.
Why would you need a 10:1 Paul?
The regulators increase fuel pressure by restricting the line. It would seem to me that the biggest restriction is the only restriction that would do anything. Which would make the 1:1 do nothing...
I could be wrong in my theory though, just let me know.

No, your theory is absolutely correct, but the 1:1 AFPR would allow for more adjustability in the base pressure. He's more likely to get a stoichiometric fuel curve with a 10:1 disk after adjusting the base pressure.

 

[silvreclips]

You may want to invest in a WBo2 as well. Also you need to put something on that map sensor. ECU will cut fuel even with the FMU without it.

I have a missing link for sale right now. PM me if you want it.

 

[gsgoingturbo]

I have a missing link for sale right now. PM me if you want it.

Sorry, I got the turboxs FCD before I saw this. Oh well, I'm sure you'll be able to sell it to someone else.