Fuel tuning question

[94Jettameowpsst]

Mods in profile are up to date besides a maft and my fpr and cams are stock.

Could someone post a dsmlink log with a similar setup to mine (preferably with 650s) so i can take a look at it.
Now here's the problem. Before i put a maft on my car i was seeing around 38-40lb/min at about 18-19psi or so depending on the temp. Well now at the same psi i am seeing about 42-and upwards of 44lb/min at the same amount of boost. I know there is some calibration you have to do to dial in the different maf sensor but it sounds about right on to me as far as airflow goes. Anyways, could it be possible that im maxing out my 650s?! It knocks at the exact same rpm range in pretty much every gear and i see upwards of 110-115idcs. I dont have any boost leaks or anything so other than having a clogged pump or bad fpr im not too sure if thats the problem (long story short my filter was original and the gas that came out of it looked like brown gack you get out of vending machines )

Any input would be appreciated

btw, also, as far as timing goes....well...13deg at redline....need i say more :<

 

[pneumo]

Does the knock start about the same time the injectors reach 100% DC? If you look at the logs injDC should gradually increase as rpm goes up. If it fluctuates by more than a few % you have a tuning problem. I've seen knock start just as the injectors go over 100%, especially if DC hovers around 100% for a few hundred rpm.

Yeah, you need bigger injectors. I ran 720's with a 50 trim and still saw over 90% DC on pumpgas.

 

[94Jettameowpsst]

Oh wow, i always thought you could make a lot more power on 650s but i guess it really does depend on the application. But as you said, yes, it only really starts to knock when it reaches 99+idc....looks like its time to get some 1000's !

 

[pneumo]

Until you get bigger injectors, here's a little trick I learned when I was pushing a 14b into the 11's with stock injectors.
Knock tends to pop up when DC is around 100%, but if DC is over or under 100% it's less likely to start. So check your logs to see at what rpm the injectors go from about 98% to 102%. Pull out 1% fuel where DC is around 98%, and add 3% where DC is around 100%. This should let the injectors transition from below 100%DC to above 100%DC quickly, and avoid the knock that starts during that transition. HTH