</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> Be nice to see a boost vehicle breaking the 12 sec mark </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Give it some time, my goal is to hit 12's at least once <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Kent

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by parish8:
<strong>(mr mix, i should have goten the 50's <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> ) </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Come on Parish your killin me!!! <img border="0" title="" alt="[Razz]" src="gr_tounge.gif" />

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> this is about as far as i can go without spending more money. my injector duty cycle was at 108% so they are finished(mr mix, i should have goten the 50's ), my fuel presure diped at the 2-3shift about 5psi. o2's droped from around .94 to .90 at that point. my maf was reading 48lb/min and i was only seeing 7.25psi. i think with the good gas i could go at least to 8, maybe 9psi but i would need a pump and injectors to do that. </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Couldn't you keep your current injectors and add the whipple computer with the additional injectors? Maybe the additional injectors would give you enough fuel for the upper RPM's and save some money.

Kent

 

I was thinking something like that too.

 

yea, that has pased thru my mind a few times but i don't know what controls those injectors. i have a feeling that they know at what MAF reading a stock truck runs out of injectors and they start adding fuel then. if thats the case they will add fuel way too soon.

doesn't seem posiable that they would add fuel just based on the o2's since i keep hearing how inconsistant the stock ones can be but maybe that is how they do it.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by parish8:
<strong>yea, that has pased thru my mind a few times but i don't know what controls those injectors. i have a feeling that they know at what MAF reading a stock truck runs out of injectors and they start adding fuel then. if thats the case they will add fuel way too soon.

doesn't seem posiable that they would add fuel just based on the o2's since i keep hearing how inconsistant the stock ones can be but maybe that is how they do it.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">from what i understand from talking to stephen at whipple,the auxillary injectors come in from maf readings and throttle position.i think over 70% throttle and im not sure what grams of air the maf has to show for them to kick in for the 6.0.i think its 270-280 grams on the 4.8.they pulse only briefly,they wont dump tons of fuel.we put a noid light on my truck and ran it,the injector pulse was very brief and just about at the shift point.i may be wrong,but i think if you add the auxillary injectors and a better fuel pump,or whipples boost a pump you will clear up alot of fuel problems.then its just a matter of tuning it in <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

 

if that is how they do it i dont think it will work for me very well, my over sized injectors work alot longer than the stock ones would so the whipple is going to add fuel way before i need it.

i couldn't decide what fuel pump set up to go with so i just got a basic higher flowing intank for now. it will hold me for awhile but probably not if i ever hit it with some juice.

my o2's droped from .93-.94 down to .90 at the shifts, if i fix the pump problem i bet the 02's wont even see the injectors run out, i can also turn up my presure about 5psi and pull back on the enrichment, that will hold me a little longer also. give me some time to decide if i want those 50's or can figure out a way to use the whipple set up.

 

You could add it back in, log your stuff, then tune it back to where you want it. Logs lots of runs. Look at the RPMs where the O2 readings jump. Thats when the aux injectors turn on. Then lower the needed values in the LS1 Edit - PE vs RPM table. Then test again, etc.. until you get it back where you want it. Since its only at WOT, it wont effect your normal driving. Its cheap this way, you already have the aux components, just throw them back on and test it.

 

somebody help me understand somthing.is there any internal work done to the motor??if not,i dont see the need for the big injectors in the first place.the whipple kit for the 6.0 is no different
then the 4.8/5.3 kit other than the 6.0 kit come with a whipple boost a pump.but since the injectors are in,thats not a problem since you can tune it to run them.i think most of you problem is right infront of you.there is a reason for the auxillary injectors and for the whipple computer.you can keep beating your head against a wall or you can try putting the auxilary suff on.you will never know till you try.the extra injectors will not overload with fuel and you can tune the truck accordingly anyway.it wont cost a dime to try,so i think it would be worth it.
i hope you work it out...i want to see some times in the 12's <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

 

my whipple kit is for a stock 5.3, not a 6.0 with good exhaust.

by far the best and simplest way to tune these ls1's is to have injectors that are large enuff to do the job and let the factory ecm control the fuel. FMU(fuel management unit) suck, call whipple and ask them, they set up the FMU to work on a stock engine, once you start messing with the set up it is no longer calibrated corectly and there is no way to adjust it. that is why it is better to go with big injectors and some ls1edit tuning, go into the FI forum and ask what they think of FMU's

i am prety sure i would be <img border="0" alt="[Banging Head]" title="" src="graemlins/gr_banghead.gif" /> i by trying to make those whipple injectors work. it would be hard to get a nice even A/F ratio using those and the 41's, if i put the original injectors in then it might work but i am sure the whipple injectors would run out of fuel then. i am prety sure it is more complacated than just pulling some fuel and turning on the whipple injectors