So, we just assembled a 2.4 with evo head. Engine runs great with -3.75 on each cam gear. Problem is that is seems to want a ridiculous amount of fuel. I have precision 1200 injectors. Car is also on speed density. The injectors are currently scaled at 780. We dumped fuel everywhere and is not going rich like I would think that it would. The car is currently being broken in so no logs to provide per se. Question is does the 2.4 really move so much more air that it really needs all this fuel? BTW Fuel system is brand new walbro plus external bosch, FPR was tested and good. Good fuel pressure. turbo is 6262

 

I went from 570@29psi to 588 at 22.7psi (2.0 to 2.4) so yeah they move a little more air

 

It is almost unbelievable. I spent the day trying to chase down a fuel problem that apparently is not there. I thought to myself " there is no way, something most be wrong in my fuel system" Now that I know the fuel system is all good, I guess I will keeping adding fuel and let her rip once she hits 500 miles or so. I wonder what the cfm's look like for this engine compared to a 2.0???

 

Well before I tell you all it is was the motor moves that much more air, have you checked the pump to make sure its not bypassing or doing anything wierd? Both the NB and WB sensors are known good?

SD will change how everything is setup but if you have a MAPVE and RPMVE table more or less like I am doing these days, scaling for 1200s should be somewhere between 975 and 1044. Headwork and cams?

As far as CFM, there are calculators to give you a rough idea of percentage of increased airflow based on displacement (it wont just be 20%) vs what the head is doing.

 

Thanks for the help. I tracked down the fueling problem to the hobbs switch. I thought the one that i had for the 2nd pump was preset to 4 psi when it was in fact a 15 psi switch. By the time the second pump was up to speed, I was well into boost and thus causing the lean conditions that I was seeing. BTW this 2.4 6262 combo is just badass. Spool is quick and it's is simply ripping fast on just a break in tune. Hopefully we will spin the rollers next week and wring it out real good

 

Wow. That's crazy. Guess a 2.4 does move that much more air...


-Bink

 

what size injectors for pump/q16 do you recommend for 600whp with a FP black and 2.4lt

 

same fuel set up I have except I have the 2150 injectors. Close to the same turbo 2.4 with a 3586.

 

I have this same setup 2.4 6262 . Can wait to get it tuned? Are you using the .82 or .63 turbine?

 

1150-1200s and a single modded walbro. If you are going to try to make more than that, twin pumps and the 1200s should still be able to get it done.

 

Thank you sir!

 

Wow, I hope I will make ruffly that kind of power with my up and coming set up. Will I Mr.Bradley? Mods and what is being done to my car in my sig. I am also going to have 2 maps. One for 93 oct and another for Q16. I am going to be running PTE 1200cc injectors.