As the headline implies, i'm in the midsts of aquiring parts for the turboing of my NA.. I have heard all of my time on this board that "NA injectors are good for 250HP!!" every time someone mentions upgrading..

So: Are they REALLY good for 250HP? My setup will be a stock turbo, with a FMIC, rather unrestricted exhaust, a good cone intake, and a megasquirt. I will of course be monitorig with a wideband 02. My goal is to just make the 250 HP mark, cause I don't want to upgrade my tranny/diff until the end of this season (I don't think i'll have time to source one until then).

Can it be done, or should I be including a set of injectors in my shopping list?

Thanks

 

RC engineering has a great site with the info you need. You can enter the duty cycle + # of injectors by the size and they will tell you the #HP the fuel will support.

Here is the link.....your welcome Bro......


http://www.rceng.com/technical.htm

 

You probably already know, but you shouldn't go over 85% on the duty cycle.

 

They wont even suport 250 at the flywheel. Boost tends to like fuel just how it is. I was making around 270 and aparently runing lean with 4x550's on stock FPR with FD pump.

 

The link will hook up the right injector, and by the math, 460's are not even close.

 

550's and 720's so many 6 port turbo's !!

 

I think in the fuel system with a turbocharged rotary, especially a turbo'd NA its always best to have the capacity to go higher than what your HP goal is.

 

I did the math once and they top out at almost exactly 250 flywheel HP at full duty cycle. A turbo motor woud have a much higher bsfc tho so i would say it wouldnt even be safe for stock T2 power levels.

 

Dial up your fuel pressure to 54 psi and the injectors will support it no problem. Equivalent of 4 x 550's.

 

Wow, that's a sweet ***'d link..

Although a the numbers match what scathcart is saying, It appears that it's bloody close.. I think i'll source a set of 550s/720s or something of the sort, with an adjustable FPR to deal with it. Better safe than sorry, especially cause that link says that If I hit anywhere near 250 at the wheels (bye bye, driveline!), I'll need the equivalent of 4 580s...

Thanks for all the info and opinions, guys.

 

Don't forget that you NEED a BSFC to calculate how much HP you can get from your injectors. I find a number between .65-70 tends to be appropriate for most rotary vehicles.

 

Yeah, and according to that, kicking that up to over .65 really makes the need go up.. maybe I'll source 720s/1000s so I will be prepared for the future...

 

Well, a ported engine that's built well will usually run around .55-60, stock ports are common to be around .65, so I usually use .65-70 to give me a worse case scenario.