Snafu-Si

I have a 99 Civic Si

I will be running a turbo and plan on only pushing about 7-8 psi. Maybe less, maybe more.

I don't have to get a stronger fuel pump do I? Stock one should suffice with small boost? Let me know. Thanks.

DC2

If you will be running high fuel press. by all means get an inline pump that can handle up there, say a Bosch or Airtex.

jamal-188

Yeah, better safe than sorry! But if you go w/ the drag kit they come w/ an airtex inline pump.

xero-cool

you will need more fuel with your turbo setup to keep from leaning out and destroying your engine. If you specify what kind of turbo you would be running rather than amount of boost (6 psi on a T25 is not equal to 6 psi on a T3/TO4E) you would get more accurate answers....oh yeah what engine also...

Herminator

I got a question about my setup also. Right now I got a 2000 Si Greddy kit TD05 18G with 310 injectors and high flow intank pump 225lph. I plan on boosting 14 psi with 700+cc injectors and hondata 2b. Will I need a bigger fuel pump if I were to run 14 psi of boost?

The_Head

With a Hondata and 700 cc injectors you can keep your fuel pump. You could have stayed with the stock fuel pump since your using the Hondata to control your injectors.

Rain_man

As I understand it, upgrading your fuel pump is crucial if you are running high pressures. However, if you're going to be using Hondata and some big injectors, the stock one should be okay since you'll be at about 48 psi of fuel pressure at 8 psi of boost.

I found this place really helpful: http://www.hondata.com/techfuelpump.html

93LSivic

This may be true. But I run 550's and just today dyno'd my car. Running hondata (untuned) and 48 psi of fuel pressure and 5 psi of boost------I was seeing a/f ratios of 14

So, yes get an inline helper pump. Or run huge injectors with hondata and the walbro 255 should do.

The_Head

That seems weird, maybe its because you were running the stock hondata program, you should turn up the duty cycle on the injectors when you tune it

I run RC 440's with a walbro 255 lph, and the pressure is set to 40 psi, so basically I got the Walbro just to have a new fuel pump, the car was tuned to run 12:1 A/F at 200 ft above sea level.