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Boost To High?

1K views 10 replies 6 participants last post by  french_hustler  
#1 ·
I am running 18 psi on a 14b, on shell 93 v power with a small frontmount, and a fuel pump, and the lower honeycomb removed. I have new ngk plugs and wires bpr7es. my plugs seem very light, am i running to lean? when i floor it, once i get around 5500 or so, it seems like it misfires, makes a little pop, and like hesitates, and just seems like it messes up for a second, and i let off.
my base timing is 5*
what is causing this misfire? could i have a boostleak?
i ran a low 13 second pass, on 14 psi, and the car feels very strong, and driven harrder can definatly be a 12 second car, but now with the boost up what is this problem?
could it be the gas?
thanks :)
 
Discussion starter · #7 · (Edited)
BTW its like 50 degrees F here i have mmcd , and i cant get my log on the comp, cause i have win 98 and i cant get excel hers some stuff from a 1st, and 2nd gear pull
BTW i turned the boost to 15 psi

RPM injp injd tps knck o2V timA
2968 7.16ms 17.1% 91.4% 0 0.80v 31*
3812 11.51 35.9 91.4 0 0.82 25*
5187 19.71 85.1 92.9 0 0.83 21*
5687 1.27 5.4 9.3 0 0.76 34*
4250 17.66 62.5 94.1 0 0.85 21*
4843 19.19 77.3 94.9 0 0.82 19*
5406 19.71 88.2 95.3 0 0.80 18*
5843 19.19 92.9 95.3 0 0.80 21*
6281 17.91 93.7 94.9 0 0.80 22*
6656 16.89 93.7 95.3 0 0.82 20*
 
Discussion starter · #6 ·
i turned it down about 1/2 of a turn on my MBC before my way home, but the boost stayed the same.
I have a mmcd pocket logger, but i am yet to get a good log with this boost setting, BTW my base timing is at 5* advance i just turned it downa bit, because it was about 9* and i was getting like 30 counts of knock at 15spi.
but then i turned it to 5* BT and i seemed to get 0 knock, and 40* advance when not boosting, and it would drop to about 20* advance when boosting is that ok?
than i logged it agin at about 15 psi, and got about 10 counts of knock, and same timing.
maybe i will regap the plugs(bpr7es) in the moring, and i have ngk wires as well, and neither haev over 2k on them.
 
Discussion starter · #4 ·
i just came home from my dads house, and it seems like it misfires super bad between 6-7k, it was just breaking up terribly, it never did this before, could it be because the boost is to high?