Is this going to be to much fuel?

[Rex2342]

I have a set of FIC 660's, a B&M FPR with a guage, and a 2g Maf and want to install it all in my car. I'm still running the stock 14B @ 18lbs using an AFCII to dial it in but I'm hitting fuel cut more and more now that it's getting colder outside. I know the logical thing to do would be to turn down the boost but thats no fun. Would the 660's be to much to tune down with the 2g maf and the stock turbo? My data logger cable is broken so I have to wait until I find a new before I can use it again but was wondering if I could use this stuff to help with fuel cut until I can fine tune it using the AFC and data logger?

 

[viper995]

i think the 660 are to much for the 14b low cfm i have a t3/t4 50trim running 20psi
and i have 650 and i get fuel cut on a cold day to the 650 are just right for me i think you just needed a 255 or 190 fuel pump just my 2cent. good luck Rex2342

 

[oldman]

I have a set of FIC 660's, a B&M FPR with a guage, and a 2g Maf and want to install it all in my car. I'm still running the stock 14B @ 18lbs using an AFCII to dial it in but I'm hitting fuel cut more and more now that it's getting colder outside. I know the logical thing to do would be to turn down the boost but thats no fun. Would the 660's be to much to tune down with the 2g maf and the stock turbo? My data logger cable is broken so I have to wait until I find a new before I can use it again but was wondering if I could use this stuff to help with fuel cut until I can fine tune it using the AFC and data logger?

No. In fact, having larger injectors and having to compensate for them on the afc will instead help delay fuel cut if anything. I suspect your problem is boost leak.

 

[oldman]

I also suggest not to run the car until you fix your logger connection.

 

[viper995]

ok sorry I learn something new every day.

 

[Rex2342]

I have a 255 installed already. When it's around 60-70 outside I run a 10-12% increase in fuel with the stock injectors from 3400rpm-6500rpm with no fuel cut but the injector duty cycle was 95-98%!! I'm going from memory here on the duty cylce so it may be off a bit but it pulls nice like this to 6500rpm with no fuel cut. Now that it's getting colder at night I have to reduce the AFC to 6-7% to keep it from cutting and I'm worried that I'm getting knock like this but I have no way to tell at the moment. I've checked for boost leaks and couldn't find any but I do have a little exhaust leak where the DP connects to the O2 housing.I just wanted to know if I could use any or all of this stuff to possibly help the stock injectors or just use te 660's and fine tune it when I get my cable for the logger. I thik the 660 will be to much but maybe the FPR and 2g maf could help.

 

[oldman]

Let me clarify this for you. Hitting fuel cut has nothing to do with your idc or fuel delivery capability, it's triggered by air flow and air flow only. Its purpose is to protect the system from a drastic increase in air flow usually caused by boost creep, boost leak or run away boost. The reason I posted that larger injectors will help delay fuel cut is not because it's capable of delivering more fuel rather due to the fact that leaning them out on the AFC will result in ecu seeing less than the actual air flow.

 

[Rex2342]

So if I install the 660's and correct them with the AFC the ECU will think there is less air coming in and that will delay my fuel cut? I'm going to check for a boost leak again because it's been a month or so since I last checked and now you've got me worried. I do have a boost spike? At WOT it will spike to 20lbs and drop back to 18lbs after a few seconds. Would just installing the 2g maf do anything without the bigger injectors or would I have to correct the stock 450's even further to compensate for the added airflow?

 

[oldman]

I'm going to check for a boost leak again because it's been a month or so since I last checked and now you've got me worried.

How much psi and for how long did your system hold during your last leak test?

I do have a boost spike? At WOT it will spike to 20lbs and drop back to 18lbs after a few seconds.

Do you have a TurboXS bleeder type mbc or a ball/spring type mbc? Is it tapping the BOV line or the J-pipe?

Would just installing the 2g maf do anything without the bigger injectors

2G mas will not change when you hit fuel cut unless a defective 1G maf was the cause of your fuel cut.

or would I have to correct the stock 450's even further to compensate for the added airflow?

Let me understand this, you still have the 450s in the system? If so, having to make adjustments on afc with stock injectors is a clear indication that the system is having problems, zero out the afc and fix your problems first. DO NOT MAKE ADJUSTMENTS TO THE AFC UNTIL LOGGER, 660s AND THE 2g MAS IS INSTALLED.

 

[Rex2342]

The system held 20psi for about 5 minutes or so before I released it. I didn't hear any hissing sounds from anywhere so I thought it was ok. I'll check again to be sure. I'm using the Perrin racing MBC. It's a ball and spring type controller. Yes I'm still using the 450's . The only reason I corrected them with the AFC was because of the increased boost level and the knock counts I was getting from the logger.

 

[oldman]

The system held 20psi for about 5 minutes or so before I released it. I didn't hear any hissing sounds from anywhere so I thought it was ok. I'll check again to be sure.

If you can re-produce this result on your next pressure test, boost leak isn't your problem.

I'm using the Perrin racing MBC. It's a ball and spring type controller.

Where are you tapping for the pressure source?

Yes I'm still using the 450's . The only reason I corrected them with the AFC was because of the increased boost level and the knock counts I was getting from the logger.

The reason you were knocking is probably due to running lean with the stock pump and injectors, proper remedy should have been tunning the boot down to where there isn't knock until the fuel system is upgraded. Are you sure you're hitting fuel cut instead of bogging due to knock and timing retard?

 

[oldman]

Describe your suppose fuel cut.

 

[Rex2342]

I have the MBC tapped into the BOV line. The best I can describe my fuel cut is like running into a brick wall! I shouldn't have to worry about it much longer though because I think either my center diff or my T-case is going bad so it may be down a while. Today while driving I heard this metal on metal sound from under the car and the car slowed down badly. I pushed in the clutch and it rolled fine. I then dropped it into 4th and it was ok again until I stopped then the same thing happened. I drove it to my buddys house everything seemed fine on this trip. I dropped the T-case, changed the fluid in that which was low, changed the fluid in the trans, and triple checked to see if anything was wrong. I couldn't find anything. No metal shavings or anything like that. Everything was tight. The only thing I didn't check was the rear end but the sound came from up front some where so I don't think that was it.

 

[91etalon]

im running 680s on a 14b turbo on 20 psi and i have no problems whatsoever. im also using a 2g mas. what are your settings on the afc???? also whats your fuel pressure?? mine is set at 43 psi.

 

[Rex2342]

i haven't installed anything just yet so my fuel pressure is stock but may be higher due to the 255 but I don't know for sure. I'm just going to put them in and tune everything once I get my data logger back online. Hopefully everything will be ok. I need to find out whats going on with my drivetain first though. I think my center diff is going or something.