Post AFPR install

[AWDTireSmokeTsi]

Last weekend I put a full throttle speed afpr on my 95 Talon. Direct bolt on. Before the afpr (see mods below) my mbc was set at 17 psi, it would hit 17 psi for awhile then creep up to 20+ psi until I backed off the throttle. After the AFPR it hits 15 psi and stay there no creep, but when I do a 3rd gear pull, I hit fuel cut halfway thru it. Could weather be affecting this? Its the middle of winter and about 20 degrees out? Or are my injectors pretty much maxed out? I will know whats going on for sure as soon as I can borrow my friends logger.

Mods: Ported 14b, ported 2g manifold, o2 dump, mbc, 1g bov, intake, full 3 inch exhaust, walbro 255, afpr, full ic piping, DXD-F Clutch, unorthadox flywheel.

My Egts are around 1450-1500.
Next is mod is DSMlink-injectors.

afpr = 42-43 psi, idle, with vaccum line off.

Its been tested for boost leaks, none.

 

[12sec92Tsi]

I'd put in bigger injectors, that should solve your fuel cut issues, or get an eprom chip with no fuel cut.

 

[AWDTireSmokeTsi]

"Next is mod is DSMlink-injectors." Going with 720's probably. I shouldnt be hitting fuel cut at 16 psi. An EPROM is useless because DSMlink is going in there.

 

[beat90tsi]

I used to get fuel cut at 15psi on my stock injectors in really cold weather.
The FPR shouldn't have anything to do with real boost creep. The only way I can see your boost being affected by that install is some messed up vac line configuration.

 

[karbon]

afpr = 42-43 psi, idle, with vaccum line off.

Could that have anything to do with it? I don't think a rising rate regulator gets that "rising rate" feature when it's not getting a boost signal. In other words you idle at 42, then under 17 PSI of boost, your injectors need 59PSI of fuel pressure to continue providing enough fuel, but they're still getting only 42.

On the other hand maybe I'm reading it wrong and you mean that your idle fuel pressure is 42 WHEN the vacuum line is off, but you drive with it on normally.

 

[AWDTireSmokeTsi]

Could that have anything to do with it? I don't think a rising rate regulator gets that "rising rate" feature when it's not getting a boost signal. In other words you idle at 42, then under 17 PSI of boost, your injectors need 59PSI of fuel pressure to continue providing enough fuel, but they're still getting only 42.

On the other hand maybe I'm reading it wrong and you mean that your idle fuel pressure is 42 WHEN the vacuum line is off, but you drive with it on normally.

You are correct, boost rises with fuel pressure 1:1. At 17 psi off boost I am getting 59 PSI of fuel pressure as I understand it.
Yes< i drive with my vaccum on, I just thought you were supposed to set the base pressure with the vaccum line off.

 

[cfisher]

You are supposed to set it when the vacuum line is off and the car is still cold. 43.5psi with the vaccum line off and you should get about 38psi with it on.

 

[BluemeanieTSi]

1450-1500 degrees with 450s??? holie crap you're running rich as hell that's why you're hitting fuel cut