Engine Troubles

[AJ]

Originally posted by DSMChick@Jan 21 2004, 09:53 PM
Yeah, if you are venting to the atmosphere, that could be causing your car to die when it's cold out. Venting to the atmosphere isn't recommended under any circumstance and usually makes your car run like crap.
Venting isn't good for his setup, but common on more in depth applications.

[Halon]

with a stock MAS setup, venting will cause problems. If you are using a VPC or a gm maf setup, then you will be able to vent just fine.

[JiN]

i got the word "cure" from a DSM faq.

[Halon]

im sticking with my original responce

for your setup...
bigger fuel pump = no more fuel cut

bigger injectors and some form of fuel control would be a good idea since you are using a larger turbo now, but not 100% necessary if you don't run high psi.
and now im off to bed

[Shane@DBPerformance]

Fuel cut has nothing to do with fuel flow.

You could put in a 1000lph fuel pump and rewire it and it's won't affect fuel cut at all. Putting in bigger injectors or raising the fuel pressure with also not fix fuel cut on their own.

Fuel cut is based purely on the ECU reading to much air flow, it doesn't give a crap about fuel, it has no way to even know if it's running lean at WOT. The ECU is basically just programmed that if it sees over X amount of airflow at X RPM it does fuel cut because it thinks the wastegate has failed. You have to make the ECU see less airflow to keep it from fuel cutting. You can do that by lowering the boost, hacking the MAS, or using an electronic fuel controller to lower the airflow signal Hz getting to the ECU.

[JiN]

See I thought it was all ECU.

[Miranda]

I know I know!!!!!! SELL IT!!!! :stick:

[JiN]

Originally posted by Miranda@Jan 22 2004, 03:00 AM
I know I know!!!!!! SELL IT!!!! :stick:
:blink: H8tR! :razz2:

[slowbubblecar]

Originally posted by ecoli@Jan 22 2004, 01:26 AM
Fuel cut has nothing to do with fuel flow.

You could put in a 1000lph fuel pump and rewire it and it's won't affect fuel cut at all. Putting in bigger injectors or raising the fuel pressure with also not fix fuel cut on their own.

Fuel cut is based purely on the ECU reading to much air flow, it doesn't give a crap about fuel, it has no way to even know if it's running lean at WOT. The ECU is basically just programmed that if it sees over X amount of airflow at X RPM it does fuel cut because it thinks the wastegate has failed. You have to make the ECU see less airflow to keep it from fuel cutting. You can do that by lowering the boost, hacking the MAS, or using an electronic fuel controller to lower the airflow signal Hz getting to the ECU.
Finally some correct info! I don't buy into the gm maft stuff much just because of Peter's eperiences. Having to turn boost down to 13 psi (with the gm maft) so I don't hit fuel cut is pointless IMO.

Get 550's and a SAFC to help with fuel cut. If you don't have much money you can hack the mas a bit. You will need a fuel pump in your setup but it will NOT do shit for fuel cut.

If you get larger injectors, you can remove some of the reading from the MAS with teh SAFC. That is how you get away from fuel cut. I am not sure of the exact number on a 2g mas but you would hit fuel cut if you exceeded the mas' rating of 2100 (guessed on #). If your car is overrunning the mas (say getting 2200) you will get fuel cut. That is why a pump will not help you. You need to take away part of the airflow reading with a SAFC or by hacking the mas.

[A//// Guy]

Kid what are you talking about, "buying into the gmaft and 13 psi?" Whats pointless about turning it down so I dont get fuel cut???

Only when its 40 degrees or below CURRENTLY with my 450s and pump gas I cannot go past 12-13 psi becuase I will overrun the injectors. Therefore I will fuel cut.

I have been stating that airflow is what causes the ecu to fuel cut... Not always will the bigger injectors or a bigger pump CURE it. It will help it though, or raise the psi it will cut at.

I run richer with pump gas, I have a safc and I dont like to lean it out too much becuase of knock... Summertime is all candy when it comes to fuel cut cuz its warm out and the air is less dense.