fuel cut?searched for 45min on here

[91talondsm]

sorry if there is a thread already on here but i understand what fuel cut is but i cant seem to eliminate it, heres my problem:
ok i just installed a new 16g e3 turbo, i dont have my wepon r f.p.r on yet and i no the stock one is being overrun by the 255 fuel pump (on the stock 450cc injectors). i put my timming to advanced 5 degrees and the boost to 15psi, the talon gets up fine in first and second then when i hit third at 4500 to 5000 rpm i get the imfamous "fuel cut" yes its like hitting a freaking brick wall. i no my mods are still stock right now but this week i'll have my adjustable f.p.r in, 680cc injectors in and my air fuel guage in will these mods help the fuel cut with a good tune? or will i need that fuel cut defender hks makes for my car.i put the lower comb back in my MAS also cause i herd it could hurt the motor.

[tfoti]

The biggest culprit of fuel cut is a boost leak. Do a real good test on your intake for them.

[steviek]

I disagree
I think he is hitting fuel cut cause his 450cc's are maxed out. And fixing any boost leak would just provide more air and even leaner conditions. It is also quite possible you are hitting the 2.1g/rev limiter on the ecu. Don't bother with the fuel cut defender. When you get those 680's in and correct it with a tuning tool you shouldn't have the fuel cut problem unless it is the ecu limiter. If its that well there isn't much you can do but get it chipped or dsmlink which removes the factory defaults.

[Thor06]

I bet its the 450's on an e316g at 15 psi. Get a little DSMlink action and some legitimate sized injectors, then have fun. Until then, you need to turn that boost down.

[91talondsm]

alright the boost is going down for now till i get the 680s in, but you no how hard its gonna be for me to do that. so injectors find some one with dsm link tune it then have some fun?

[tfoti]

Although the 450s may be maxed out, you cannot rule out a boost leak either causing fuel cut. So turn your boost down and do an intake leak test properly.

Read this: http://www.dsmtuners.com/forums/tuni...4-gen-1-a.html

http://www.dsmtuners.com/forums/newb...-merged-2.html

[Thor06]

No, you need to buy DSMlink. I suppose you could get a keydriver chip or whatever they are, but link is the best way to do it. You cant go SAFC route either, 680's are too big for it, plus they wont provide enough fuel for higher boost.

[tfoti]

A lean mixture won't make the ECU cut fuel and spark. It irks me when i hear people saying maxed out injectors and fuel system causes fuel cut.

I agree DSMLink is the best mod you can do at this point but if you still have boost leaks you won't get a good tune. And I think thats where the root of this problem lies.

Read last sentence
http://www.dsm.org/how-tos/JFM/MAF_Mod.html

[Thor06]

I know that lean conditions wont make it fuel cut, but I was always under the impression that too much airflow will. I thought that once the ECU saw a certain airflow it would cut fuel because it knows what the stock system can handle. Since it wouldnt make sense that the airflow necessary to make it fuel cut would be higher than the stock fuel system can take, I always thought it would cut right around where the stock shit maxed.

I had no idea that fuel cut would be caused like that, good info.

[91talondsm]

thanks for the info, im gonna try that MAS mod now cause i did it with the plug and the screw still in, then im gonna run it without the air canister cause now i just got a parcial cut.
i no this mod says it will elimenate fuel cut, but should i be causious and still keep the boost down till i at least get a air fuel guage to at least see how lean or rich im running?(well i guess that an obvious yes)i no i am running lean already cause of the white suet on the plugs but i put my old NGK R's back in cause i had had the NGK uraniaum plugs in and dont really no whats better or if the uraniam plugs were getting to hot.

[tfoti]

You need a logger to see if you are knocking and a wideband O2 sensor to have any use of an A/F gauge.

[91talondsm]

if i go and get it tuned wont they have a logger and dsmlink to help tune it? cause thats a thousand dollers worth of equipment i cant afford right now.

if i im running TOO lean is there any additives i can use to at least be on the safe side like fuel injector cleaner or octane booster?

[steviek]

no you need to have your own dsmlink. The ecu needs to be chipped and socketed so that it can save your adjusted settings.

[91talondsm]

it says in the chiltons book that theres a plug u can ground out and it shuts off the ecu to adjust for timming, this wont work when tuning? if anything im just gonna go with the 550cc's and an apexi afc then i should be able to control air/fuel since the 680cc's wont work with the afc.

this dsm store says this afc works well with bigger injectors.
http://www.dsmparts.com/customer/pro...?productid=150

[ned032002]

I getting some hardcore fuel cut at about 5000RPMs so I'm going to need to do another boost leak test. Last time I did a test I thought I may have heard a leak around the intake manifold but not sure exactly. Will update soon.