Yesterday i dynoed my car at 213whp at 7psi on a stock b16a.

The torque is in a mess

Tuner advised my walbro is going out......
So my question is can i use the stock fuel pump with Rc550cc injectors?
going for about 250whp.

 

you can. I did. But I would recommend getting a new pump. It's only an extra 100 or so and might keep your engine from blowing from going lean.

My OEM pump has never had issues and was never going lean. It's just reasurance by getting a new pump.

 

IMO its not worth the risk....i'd get another Walbro and try again.

 

The pressure dosent drop. it just makes a loud whirling noise

 

I totaly Ran out of pump (on the stock pump)around 270whp on a stock ls with 450cc injectors.

Went lean it sucked... not worth it

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b16a4 &raquo;</TD></TR><TR><TD CLASS="quote">The pressure dosent drop. it just makes a loud whirling noise</TD></TR></TABLE>

Walbro pumps tend to make a louder than stock whirring noise...was the pump new when you got it?? Who's tuning your car and do you have a graph so far??

 

Just to add, there are two OEM pumps in the Honda's/Acura's. Someone in another thread stated that it was specific to the Bseries equipped cars. I think that some Si models with the Dseries had them though also...gonna have to check some part numbers.

Either way, we'll go safely with saying the "bseries" equipped cars came with a higher flow fuel pump and those are the ones that'll support 300whp+. A guy in the other thread made 350+whp on his stockie.

There was an article back in the day (Honda Tuning I believe) addressing this...it was several years back. Rewiring the stock pump and removing line restrictions was proven to support almost 400whp. This required drilling the fuel filter banjo bolt to have a combined total area as large as the inlet orifice, removing small hard line internal flare flanges, and rewiring the pump.