I have a set of 450 DSM injectors on a b16 turbo motor. I have a t3/t04e turbo, 9:1 compression, head and cams are stock. My question is what is the most boost i can get out of those injectors, will 14psi be ok??
thanks
TERRY

 

depends on what you are using for your fuel system. Stock honda computer with an afc? speedpro? haltech? hondata? aem ems? fmu+afc? Need more info.

liam

 

I think injector size has more to do with overall hp output than the amount of boost you will be running. Anyway I use the calculator at the bottom of this page to get a rough idea of what a certain size injector can support http://www.rceng.com/technical.htm

 

thats a good link to bookmark thanks

 

ihave hondata stage 3 with the boost option and a walbro 255 fuel pump stock dx fuel line and stock b16 fuel line
TERRY

 

can someone explain those to me?

and what would be my fuel pressure at the fuel rail with a high pressure walbro 255 lph intank pump?

 

The duty cycle comment refers to how long the injectors are open. 80% indiacates that they are open 80% of the time and closed 20%. The injectors can be made to open longer but as the duty cycle goes up so does the risk of failure. 80% is what the industry considers a safe standard and reccomends not exceeding that standard.

BSFC is a measure of how much fuel is used to make power. I don't really know much about what the value means but the tech page says that boosted cars should be in the .6-.65 range. I put it to .65 for a margin of saftey with the calculations.

To know what your rail fuel pressure is you have to have a fuel pressure gauge. The idea in knowing this number is that with a higher fuel pressure you can flow more fuel at the same duty cylce using the same injector, but there is a limit to how affective this is, i would assume.

 

ok so back to my original question will 450cc injectors be enough to run 14psi on a built b16 block, with a t3/t04e turbo, hondata stage 3 boost upgrade?

 

I'm going with 300hp, that's what I recall.

 

ok so that should be about 14psi i would hope or maybee lessif i can squeze allittle more out with tuning

 

the injectors will only support a certain hp. Noone can really say with confidence how much boost will be needed to make a certain hp.

 

DSM's only support about 10psi of boost on my LS For whatever thats worth

 

so with a fuel pressure riser i should be ok at 300 whp?
TERRY

 

Did you check out the worksheet at the bottom of the tech page? In order to support 300 hp at a BSFC of .65 and a max duty cycle of 80% you will have to run somewhere around 90 psi static fuel pressure. I think with your goals you should step up in injector size. This is all based on what I can deduce from RC's tech page. With a 550cc injector you can support 300 hp with a rail pressure of ~65 psi. BTW the hp figures are crankshaft hp so there will be some loss due to the drive line. Can some of the tuners on here confirm that the calculations on RC's site are reputable?