i searched and read a lot of topics.... the main 2 pumps people argue over are the supra denso TT pumps and teh walbro 255...... i have read the supra TT pumps are direct drop in but more expensive... but teh walbro were chealer flowed the same but some people said that the walbros had probelms swithcing between high and lo voltage....

i ran a walbro 255 in my civic and made 414 @ 26 psi on 880c injectors and never reached close to duty cycle on the pump... but it never had a lo and hi voltage.. i really liked the walbro cheap affordable and flows well.

but i dont want to get this pump if people o her are having problems with the pump not being able to have a smooth transition between hi and lo voltage..

discuss.....

 

I've never had a personal problem with it, and I install them all the time, both in FD's and turbo II's, each of which uses the dual voltage setup.

Very often, however, one of the first mods we do is to run full power wire to the pump, bypassing the switching resistor...the resistor on the FD runs at 9vdc until you hit 3-4psi at which time it opens up to exactly 12vdc (even if your car is charging 13.5+ vdc). Since more voltage at the pump can help fuel pressure and delivery, it's cheap insurance to push the highest voltage to the pump that you can...it will hurt cold idle and fuel economy but is a free safety margin for modified cars. In this instance, the walbro works perfectly.

 

Is the idle decent once the car is warmed up?

 

my idle is fine (cold and hot) and I run it on high all the time.

it was fine with 850 injectors also.

 

cuz this be one of the reasons my car has problems when cold and sometimes hotstarts?

i have an NA -> t2 and i rewired the fuel pump .

 

what ECU are you using? Aftermarker or T2?

do you have a FPR solenoid? Have you checked fuel pressure?

 

i took out Pulsation Dampner, and replaced with banjo bolt, i have stock t2 N333 ECU (88t2)

have nocheckd fuel press. dont know how.

 

correction supra pump flows more than walbro

 

and im told the cosmo pump flows even more than the supra