Highest redline?

[djuosnteisn]

The fueling window becomes more and more narrow as the rpm's climb.... assuming you plan to stay with DI.

[Mizzle]

I don't see any reason direct injection can't support higher rpms. Educate me?

[8.5MS3]

Originally Posted by Mizzle I don't see any reason direct injection can't support higher rpms. Educate me?

DI has a very short window to inject fuel. also that fuel needs time to atomize and distribute evenly within the chamber. higher RPM does not promote even distribution and efficient burning of fuel.

[802MS3]

lol that mazda3 revving to 8k was slowwwwww

[djuosnteisn]

Originally Posted by Mizzle I don't see any reason direct injection can't support higher rpms. Educate me?

Education:
Have you measured when the injectors...

[Mizzle]

Originally Posted by djuosnteisn Education: Have you measured when the injectors...

My main issue with that thread:

"The fuel system (injectors) is not adequately sized for producing more than around 350-380whp. At that point you're also looking at very poor combustion and efficiency in the upper RPMs."

I know someone making well in excess of 400 whp on stock injectors, hpfp and stock tank pump. He's in line to hit 500 whp on his current setup.

That being said, I definitely understand the complications are specific to higher RPMs and not overall power measurements. Does anyone know what PSI is reached at 15.5lbs of boost at TDC?

[djuosnteisn]

Originally Posted by Mizzle My main issue with that thread: "The fuel system (injectors) is not adequately sized for producing more than around 350-380whp. At that point you're also looking at very poor combustion and efficiency in the upper RPMs." I know someone making well in excess of 400 whp on stock injectors, hpfp and stock tank pump. He's in line to hit 500 whp on his current setup. That being said, I definitely understand the complications are specific to higher RPMs and not overall power measurements. Does anyone know what PSI is reached at 15.5lbs of boost at TDC?

I know as well, as i hit 390 on the stock injectors. I did have my fuel rail pressure increased roughly 10%, and have shown that this is indeed a successful way to increase fueling on the stock injectors, and probably good for up to 500+whp IMO.

[06Speed6]

Originally Posted by Mizzle My main issue with that thread: "The fuel system (injectors) is not adequately sized for producing more than around 350-380whp. At that point you're also looking at very poor combustion and efficiency in the upper RPMs." I know someone making well in excess of 400 whp on stock injectors, hpfp and stock tank pump. He's in line to hit 500 whp on his current setup. That being said, I definitely understand the complications are specific to higher RPMs and not overall power measurements. Does anyone know what PSI is reached at 15.5lbs of boost at TDC?

My main issue with this post is that the stock CDFP cant flow "well in excess" of 400whp until you hit rpms that are high enough that the injectors can no longer flow "well in excess" of 400whp. Unless you are God and you can bend math to your will, it isnt possible even on paper. Never mind the combustion process etc.

The PSI of what at 15.5lbs of boost at TDC?

[8.5MS3]

i think he wants dynamic compression at full boost, at TDC.....good luck with that

[JoshProtegeGarage]

Originally Posted by opt_ms3 lol that mazda3 revving to 8k was slowwwwww

because im tunned for nitrous direct port...without my spray im slooooow had i spray i would of made your speed 3 look inferior lol. jk

[Mizzle]

Originally Posted by 8.5MS3 i think he wants dynamic compression at full boost, at TDC.....good luck with that

Yep.
I wanna know what the differential is between the cylinders and fuel supply.

[kilik2]

I heard the tables in the ecu wont let you go past 7k. just what I heard.

[8.5MS3]

Originally Posted by Mizzle Yep. I wanna know what the differential is between the cylinders and fuel supply.

well dynamic compression is not the same as cylinder pressure. Its nearly impossible to calculate since there are so many different factors that come into play. but if you want to give it a shot...

http://www.hcs.harvard.edu/jus/0303/kuo.pdf

[gogogomoveit]

You can have a full authority engine control like Apexi Power FC that allows u to set your RPM.

But the easiest way to determine the RPM without all the academics is put the car on the dyno, run it and set it just after your peak Horse power drop off. Stock engine tops out at 5500rpm and redline at 6500rpm. There is no reason to run it all the way to redline once you past the peak HP and Tq output.

On a Naturally aspirated all motor, the peak output tends to be very close to the mfg set mechanical limit on the engine(redline), hence the idea of running all the way to redline. On a FI engine or diesel engine, the reverse is true.

[madvillain]

Originally Posted by 240mazspd3 RaceRoots redline was around 8k on stock head.

was RR's redline really near 8,000? I don't remember.. I though it was 7,000.

[kilik2]

I thought it was 7k also, maybe I remembered wrong too.

[AK-speeder]

with only exhaust and intake on mine it fell right around 6k but once i put in the fidenza it would pull all the way to 7k easy when i would take the back seats out it would pull without a notice in power drop easily...

[Realgib3]

RR was set to 7500, which is as high as you can set it with the AP and I have done tests that show with a 7500rpm redline, the car will make it till ~7750 before it bounces...