Dommination of FI cars.

[Gale Forse]

How can you guys ever think that FI cars will not domminate? Last time I was starting A fire one gallon of gas made alot bigger fire than just one half gallon and with unlimted injector size you can put in as much fuel as the pump will let you. Tranlation bigger explostion and more power. No rocket sience here just plain good sence.

[Evan Smith]

Mr. Weak Forse,

I don't mean to be rude, but I seriously reccomend a trip to Borders or Barnes and Noble this holiday season. Your gale force is a weak breeze at best and I am feeling quite a bit of hot air. On your trip, pick up one of the many books on internal combustion and educate yourself, and please get a dictionary for your spelling. You have made but one correct statement so far, more gas will make more power. But it will only do so if you can supply more air and if the engine maintains the proper a/f ratio. Fuel in the internal combustion engine burns (it does not explode, Top Fuel cars explode). Furthermore, the mixture must burn rapidly and at the precise time needed to complete combustion, thus releasing heat energy from the fuel in order to get the necessary rise in cylinder pressure. This is needed to apply maximum pressure on the piston when it is about 7-14 degrees past TDC. Burning the mixture before this time (often results in detonation) or after it (rich condition with elevated EGTs) will have little to no effect on MBT (maximum brake torque). In lay terms it means more fuel doesn't mean more HP for you, EFI or otherwise!

This is one reason larger displacement engines make more power than smaller ones. They flow more air so more fuel can be burned while maintaining the proper a/f ratio. Proper a/f ratio in just about every naturally aspitated engine is about 12.7-13.3:1. You can burn more fuel with a smaller engine if you provide the airflow to match. This requires forced induction, nitrous, or any combination of larger cams, larger induction, more compression, stiffer valvesprings (for the larger cams) and/or increased rpm.

A carburetor dictates its own flow of fuel due to a pressure drop in the venturi, which draws fuel from the fuel bowl, into the boosters, thus causing it to shear of into tiny little particles (read: atomization) where it is then deliverd to the ports. Over jetting will result in a rich mixture and a loss of power, just like with EFI. I'm quite sure you could create a situation where the engine has way too much fuel with EFI in easier fashion than with a carb, but the poor drivability and loss of power would be the same.

You can throw all the fuel you want (which I recommend you try with your Hot Wheels car) at any engine, but it is likely you will see a huge loss in torque and hp, not to mention MPG, which will be a concern to racers as gas prices go up.

Lastly, put down the gasoline.

Evan

[Bruce Witherspoon]

Originally Posted by Gale Forse

How can you guys ever think that FI cars will not domminate? Last time I was starting A fire one gallon of gas made alot bigger fire than just one half gallon and with unlimted injector size you can put in as much fuel as the pump will let you. Tranlation bigger explostion and more power. No rocket sience here just plain good sence.

Gale, I'm not sure where you took IC engine 101 but you must have skipped class quite often. The logic that you are using here is the common misconception about what move a piston up and down. I think it is the expansion of an ignited AIR and fuel. The addition of excessive fuel does not make HORSEPOWER.

[Bruce Witherspoon]

Originally Posted by boster58

FYI , from GM parts catalog and on the web at http://www.gmperformanceparts.com/Pa...l.jsp?engine=2

LS2 90 mm throttle body crate engine 364/400hp
LS2 with 750 Holley and GM intake crate engine 364/440hp

I asked NHRA if I could run this combo in ss/bs and was told no. The Gen lll LS series is superior for what's inside and not on top. Racing the LS series engines with a carburetor would be easier then with the fuel injection and less costly . The computers go bad all the time. Holley , F.A.S.T. and Big Stuff makes no difference.

Bo Kenney
Racing the LS1 for 4 years and counting .

Bo, sorry to hear about your computer problems. I've had 5 years with my FAST controller without a single issue.

[Jack McCarthy]

anyone want bob shaws caddy heads up... jump on in

350 cid, 3600 lbs, 3 speed, 500cfm throttle body
VS
283 cid, 4470lbs, 2 speed, 415 (littl one) cfm 4gc

yeah im screwed... but bob is a good guy

jack mccarthy

maybe bob will let me drive the caddy at the shootout in belle rose !!!

[Jim Cimarolli]

Man, I've been getting a real education keeping up with this thread for the last couple of days. If you need a refresher course on grammar, spelling, linguistics, science, history, mathematics, and public relations you can find it all here!

Jim

[LNorton]

If you guys really think FI is that easy, then I invite you to come tune with my factory PCM. It is a PITA at best.

[SSDiv6]

Evan, check your PM.

[Angelo DiTocco]

Your all missing the point here............
The best thing about the fuel injection is that it is very economical (fuel efficient) when driving to the lanes and back to my pit spot after a run. I don't waste half the fuel I use to with the Q-jet combo. I'll bet I get 10 MPG's w/ it. Its especially nice when you have numerous rain delays and have to drive back and forth to the lanes 3 times for each run.

[Robert Pare Racing]

..not to mention that when I change my oil it doesn't smell like C-11.