View Full Version : Stumbles at high rpm then loops
driftn1g
07-15-2007, 12:20 PM
ok so i finally got my car tuned for zero knock at around 16-17psi..
sometime when im in second and i smash it to around 4-5k rpm, it will studer, then will loop when i put it in neutral.. what kind of spread should i gave on the safc2 as far as percentage when im climbing rpms
i checked my IC piping, fixed my boost leak, could it be bad plugs/wires?
DBMajik
07-15-2007, 12:24 PM
Considering you're on stock injectors, near stock boost, stock turbo.. I wouldn't think you need to go over even 10% correction on pump.
driftn1g
07-15-2007, 12:26 PM
im at like 40%.. maybe my injectors are clogged
scheides
07-15-2007, 01:08 PM
Are you logging? What's going on under these circumstances?
driftn1g
07-15-2007, 05:41 PM
well i seemed to get it better.. also ran some seafoam in it
i looked at my fuel trims Low is 129%, mid is 99% and high is 85%.. but i also dont have an adjustable FPR so i was told leave them alone??
cant remember how to adjust them, i had a write-up somewhere but lost it.. but i did get my idle to where i wanted it (750rpm)..
right now it seems like it will stop pushing at like 5k-6k, but is boosting..? rich??
xveganxcowboyx
07-15-2007, 05:49 PM
If what DB says is correct and you are indeed on stock injectors you should not be running so much correction. Are you on the stock fuel pump as well? If so I'd say turn the boost down a few PSI, zero out the SAFC and log it. Tune from there.
driftn1g
07-15-2007, 06:34 PM
im on 255lph pump
driftn1g
07-15-2007, 08:06 PM
btw how can u tell if u have compressor surge??
my bov flutters
is that bad?
stock 1g bov
Shane@DBPerformance
07-15-2007, 10:12 PM
If you have to go positive on the hi-throttle map, then you are possibly going to run into fuel cut. You shouldn't really ever have to go much positive on a DSM, unless something else is wrong or your MAS is really hacked or you are trying to run a 2G MAS with stock 450cc injectors in a 1G.
If you are running a stock 1G MAS, you might be hitting MAS overrun.
driftn1g
07-15-2007, 11:13 PM
im running a 2g mas in a 1g..
should i tune with Lo-throttle map or high??
ive been tuning with high, but adjusting idle with low
what does fuel cut feel like
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