LOL, looks like I missed the boat at what you were trying to say, next time I'll just let you explain what you meant

anyway, my example is valid, just in a different sense, and not what Zippy was saying at all................I just started thinking parasitic loss and couldn't let go I guess...........all yours zippy

 

there are a few variables that are important for that. the important one's are a/f ratio required and airflow numbers. if you have an engine on the dyno that pulls in 55lbs min of air through the maf, that engine is going to have the same fuel requirements for the most part in any vehicle you put it in. the air/fuel ratio required is also another variable. a boosted engine is commonly happy around 11.4:1-11.7:1 a/f ratio which is going to require more fuel to achieve than say a naturally asperated engine of the same airflow numbers which is commonly happy around 12.4:1-12.7:1 a/f ratio. another issue is boost pressure. to get an equal amount of fuel to come out of the injector at 0 psi compared to say 10psi, you need about another 10psi or what happens is your xxlbhr injector now becomes smaller once you're into boost.

 

Lots of good info in this and the preceding posts, Zippy. Thanks for taking the time.

As an illustration of the MAF flow vs injector deal... A truck maxing out a MAF (just frequency... not actual airflow) with a small engine (think 5.3)might do it higher in the rpm band... say 5600-5800 rpms for instance. My H2 (6.0) maxs out the MAF frequency in the 4500-4600 rpm range. That means I'm flowing a lot more air for a lot longer and working the injectors harder, too. Add in the fact that I can run 20 degrees of timing now for at least half track as long as I'm in the lower 11's for AFR and you should see that this combo takes a hell of a lot of fuel. I could run leaner if I wanted to run race gas... but I only run 1 tune that is for street and track. I don't switch. Running race fuel would consume less of a quantity of fuel in that case.

 

Nope, its a LM7 5.3L, vin T

 

Is the Magnacharger 255 pump and ford 42 lb/hr injectors enough to feed an LS1 w/ heads, cam and 10 psi in an 05 ecsb Z-71(flex) or will you still need more fuel. The internals are forged and the cam will run to 6500. will I have enough fuel w/ out the magnavolt? or should I buy it? motor (a.k.a money pit) is going in in a week or so and I dont want to wreck it. I also have changed to 88mm maf and 90mm LS2 throttle body. by the way I also need to feed a 75 hp wet nitrous shot off the rail port.

 

I would like to know this as well. I dont have the bigger MAF/TB but.....

 

1SlowHoe,
I just received my Magnavolt but it didn't come with any instructions.
do you have any and if so can you E-mail a copy to me.

I'm going to call Magnacharger as soon as they open but they all may be at the SEMA show today.

LBSBLOWN

 

I actually have the Kenne Bell one that magnacharger sold before they got there own. I guess the directions should be close. PM me your e-mail and I can send them that way. Photobucket is down right now.

 

Try this. See step 47

http://www.magnusonproducts.com/pdf/manual04.pdf

 

Thanks
That link helps out a lot