boost cutting out

[mndsm1]

just finished putting the car back together about 2 weeks ago, whenever we hit boost it feels like it cuts out and hits a brick wall at about 5K. We had the mbc and it was boosting 9.3 b y the time it hit 5k, put the stock bcs on and now its hitting 14.1 but still does the same thing around 5k. took a video to help figure out what the problem is. it has a few mods, fmic w/ maft setup, 16g.

YouTube - 1g eagle talon boost problem

 

[Supa Dexta]

Video not available.

.. Fuel cut?

 

[mndsm1]

its stock boost...idk how it would be hitting fuel cut..im trying to get the video to work right now sry about that

 

[mndsm1]

vid works now

 

[mndsm1]

the chattering noise is the interior btw

 

[snowborder714]

Boost leak test?
Check spark plugs/gap?

I assume you have all the MAFT settings right.

 

[mndsm1]

we did do a boost leak test and fixed all that...didnt check the spark plugs yet...and havent adjusted the maft settings

 

[welfle18]

When my plug gaps were off it stuttered real bad at the higher rpms. Thought it was fuel cut myself but as soon as I fixed the gap problem all was better. Might be your problem.

 

[mndsm1]

just purchsed 4 new ngk brp6's and still have the same problem...any other ideas?

 

[snowborder714]

Did you properly gap the new spark plugs to .028"? Yes, they come pregapped, but you shouldn't always trust that.

Also, can you describe where you performed a boost leak test (turbo and/or throttle body) as well as how.

 

[mndsm1]

boost leak test was done on the turbo.......and we just tested and watched the gauge and listened for leaks...we found a few...fixed them and everything else was perfect....

 

[erald01]

I definitely don't think its your spark plugs, because its only doing that at 5k rpm. Is your timing done right? Try leaving the wastegate wide open and see if it does any difference! Is your computer the stock one? Check your fuel pump, and your injectors. Make sure your injectors are sitting down tight. Thats all i can think off right now.

 

[mndsm1]

its funny that you say that because we've been talking about getting a new timing belt kit off of streettunedmotorsports because we thought it looked kinda loose. it definitely has some play up and down. also what would leaving the wastegate open do?

 

[erald01]

I would be carefull with the timing belt because if there is play, it might slip and through your timing off and mess up your head.

 

[mndsm1]

could it possibly be compressor surge?

 

[booostedGSX]

Compressor surge shouldn't be an issue. I would check all of the MAF-T settings to make sure all are okay. Also, do you have any fuel system mods (injectors, fuel pressure regulator, fuel pump)? Your profile doesn't say.

 

[mndsm1]

all the maft settings are 0'd out. and the mode is all on off. no fuel mods as of right now. could it be a clogged fuel system causing the car to not get enough fuel?

 

[booostedGSX]

Hmmm... well, the MAF-T should be set to your injector size...I'm not sure what the stock 450's go as far as the MAF-T setting... But, fuel cut is not your problem since you've got the MAF-T. I would try to consult the MAF-T Forums. Here is a link to the forums for the company that makes the MAF-T---> Full Throttle Tech Try to find the right settings for your setup. Post back with any findings.

 

[mndsm1]

i already talked to a member on here regarding the maf-t settings...and we should start out with everything at 0 with the amount of mods on the car as of right now.

 

[booostedGSX]

I was just wondering if the knob that deals with the injector size is correct. I'm not sure what stockers are supposed to be. If my car wasn't immobile at my apartment 40 mins away, I would give a quick look.

 

[highboostintsi]

according to the manual....its suppose to be at 2...according another member on here is suppose to be zero....i tried both and still had the same problems....another board member suggested it could the the maf itself...i might try swapping it out for another and see where the leads me!!!!im desperate at this point.

 

[booostedGSX]

Same person? I'm confused? If so, I would consult Full Throttle themselves. I had a problem with my MAF-T and got a quick fix from talking to Full Throttle.

 

[highboostintsi]

yeah im talking about the same car hahah.. sorrry for the confusion....ill try to contact fts on monday i guess and see what they say....

 

[snowborder714]

Wow, I'm not on my game tonight. Sorry about the misinformation. I forgot you were running a 1g and misread the table.

Your Base knob should be at 2 and your AUX knob should be at 0.

 

[mndsm1]

ya we tried that at that setting and it did the same thing. were waiting on a new maf so we can see if thats the problem. if not then were gonna start checking other things