300whp On 450cc Injectors

[IvanPSI]

Ok, so I have searched, and I have seen logs of the 450cc's. I have seen many Honda's running our 450cc's with Turbos and they have dynoed 300whp. My setup, I have a EVO 3 16G, walbro 255lph, FMIC, AFPR. Can I safely acheive 300whp on the stock 450's? I am thinking a SAFC will help as well.

 

[hubz91talontsi]

WOOT! My brohan is trying to hit 450awhp with my 450's

 

[IvanPSI]

Are we talking pump gas? Do you have an adjustable FPR? What fuel pump are you running? Are you running meth injection? Are you okay with seeing over 100% IDC? (normally should keep it under 80%)

These all come into play, but on normal pump gas, no don't think 300whp will be achieveable & still be "safe"

Yes, I do have a Adjustable FPR, and im running a walbro 255lph. No meth, pump gas.

 

[dale187]

I got a question for you guys. With my stock 450cc and aeromotive AFPR with 16g at 10psi. Could i bump my boost up to 13-14 psi with stock injectors? I dont have any other management.

 

[IvanPSI]

[Injector flow rate (in lbs/hr) * percent duty cycle] / BSFC = horsepower supported per injector
To convert cc/min to lbs/hr divide by 10.5.

Brake Specific Fuel Consumption is defined as the fuel flow rate divided by the power produced. An engine with lower BSFC is more efficient and requires less fuel to produce the same power. Higher compression and naturally aspirated engines are inherently more efficient and have BSFC numbers around 0.5, most OEM turbocharged applications have BSFC numbers above 0.6.

An engine with an efficient BSFC of 0.5 running 450cc injectors at 43.5psi base fuel pressure would require approximately 88% duty cycle to reach 300bhp. Factor in the Honda's low FWD drivetrain loss at let's say a fairly generous 12% and it would need precisely 100% duty cycle to hit 300whp.

So in short, yes it is possible that an efficient engine could produce 300whp using four 450cc injectors and without raising fuel pressure.

I was caculating 15% drivetrain loss? Cause my DSM is FWD.

 

[selmerguy]

Nitrous!!!! 100 shot on like 15 psi might be close. Have fun tuning. I would upgrade injectors. But yes it can be done. I would bet against meth in this case. You might be close but I dont think meth would get you there.

 

[RyAn007]

To Dale, do you have a data logger, if so you can turn your boost up until you see a little bit of knock than drop it down a couple psi, I usually move it down 2psi. But over all you can not know what kind of boost pressure your car can without any type of logging, but 13-14 sounds safe to me from my past experiences.