91 TSI/AWD

[bjohn]

Thanks man, are you from the msp area?

The bay is pretty grimey :/ here and there. mostly undercarriage gunk though. The open dump sounds cool to say the least. Lots of surprised looks after a run with any car lol.



Anyone have a suggestion on what to do about fuel cut? I've been talking with a few buddies and both suggested a Walboro/TRE fuel pump off of eBay. Any other fuel items that could be addressed as well?

[Shane@DBPerformance]

Originally Posted by bjohn

Anyone have a suggestion on what to do about fuel cut? I've been talking with a few buddies and both suggested a Walboro/TRE fuel pump off of eBay. Any other fuel items that could be addressed as well?

Fuel cut has nothing to actually do with a lack of fuel, it happens when the ECU sees too much airflow and it assume the wastegate setup has failed and the car is overboosting. You should get an upgraded fuel pump anyways though. The real fix for fuel cut is to turn it off in the tune, you can do that with DSMLink or an Eprom chip.

[bjohn]

Originally Posted by Shane@DBPerformance

Fuel cut has nothing to actually do with a lack of fuel, it happens when the ECU sees too much airflow and it assume the wastegate setup has failed and the car is overboosting. You should get an upgraded fuel pump anyways though. The real fix for fuel cut is to turn it off in the tune, you can do that with DSMLink or an Eprom chip.

Thanks for clearing up that misconception! Makes perfect sense. I'll look into dsmlink after I finish maintenance. Will the 1g MAF read enough air with the 16g @ 15psi? I believe my roommate has a 2g MAF. Also, are the stock injectors able to support that much over factory boost?

Originally Posted by 93gtpeater

Just do a fuel pump, 550cc injectors, and 2g maf. it will put a smile on your face. Is that exhaust loud?

The exhaust sounds really smooth when idling/cruising, the wastegate is pretty loud, so its hard to really tell how loud the exhaust is at WOT.

[blackrosenova400]

I always wondered, how do those fuel cut defenders lie to the computer without any ill efects?

Originally Posted by Shane@DBPerformance

Fuel cut has nothing to actually do with a lack of fuel, it happens when the ECU sees too much airflow and it assume the wastegate setup has failed and the car is overboosting. You should get an upgraded fuel pump anyways though. The real fix for fuel cut is to turn it off in the tune, you can do that with DSMLink or an Eprom chip.

[Shane@DBPerformance]

Originally Posted by blackrosenova400

I always wondered, how do those fuel cut defenders lie to the computer without any ill efects?

On cars like a Toyota Supra or MR2, they have a MAP sensor and a MAF. The MAF is used for primary fueling, ignition timing, load cal, etc. The MAP sensor is just used for stuff like reading boost and checking to see if EGR is working, so devices like the HKS FCD just clamp the max voltage going from the sensor to the ECU at a voltage right below fuel cut would hit. The MAF still reads and adds fueling.

On a car like an SRT that uses the MAP sensor for everything, if you clamp it at say 13psi to avoid hitting 15psi fuel cut, then it will start leaning out when it goes above the clamped voltage/boost level.

On a DSM that only has a MAS for eveything, it will start leaning out above whatever airflow they clamp the signal to the ECU at. It's a hack... Most people used to get around fuel cut on DSMs by putting in too big of injectors and lowering the reported airflow to the ECU via a piggyback like the SAFC. There is no reason you need 550s with a T25, 14B or 16G on your typical pump gas gas, except to be able to fool the ECU away from fuel cut.

So there can be ill effects.