I just finished up a build and swap on a customers car.Its a 1990 civic hatch dx,jdm b16a,ctr pistons,ctr valvetrain,ctr cams,ported head etc...would the dx pump have enough pressure to supply fuel for this setup?Its on a chipped ecu and vafc.Ive already started it up and let it idle,but the gas gauge was below E and it was on 87 octane,so whenever the gas pedal was touched it would want to die.The oil pump seal was leaking so I had to take everything apart and replace it,but its back together and plan on getting it started tonite..I havent tested the limits on a dx pump before,but I know an HF pump is good for over 150whp(if not slightly more)...just want to know if ill run into that problem.

 

I'd say replace it and consider it preventative maintenance. I believe the dx pump is good for up to 50 psi. Might as well, it's really nothing compared to the cost of the rest of the build.

 

Unless the fuel pump is bed, it should be fine for the setup. I do think though the chipped ECU could have something to do with the fuel issues, especially if it is just a generic chip.

 

I was just starting to think the chip may be the problem.He brought me a pr3 chipped by pyr and told him the mods that were done,but I just remembered that it was showing a solid cel.Ill have to burn him a new chip if thats the problem.

 

a soild cel usually means the ecu or a code 0

and the pump should be fine for what he gots I had that same set up in my LX/DX the same for about 2 years running strong, just yeah rise fuel pressure to about 50 psi unless u like to make some cash sure change it out as it is in the tank which u can charge more
(business side of my mind working!!!)

and yeah I would change the chip sounds bad

 

change it get a supra or walbro

 

The CEL (check engine light on the dash) will be solid to alarm you that there is something wrong.

Then you need to manually check for codes.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bossman032 &raquo;</TD></TR><TR><TD CLASS="quote">change it get a supra or walbro </TD></TR></TABLE>

With the Supra pump, aren't you running it @ a voltage that will shorten it's service life by about 1/2?

 

no.

if your building a motor you will need more fuel the supra one is more then enough fuel for little hondas. they are good to at least 500hp. plus it fits like factory unlike the walbro.

you will need to use thicker wire unless your planing to burn some wires up.
stock fuel pump is around 9volt supra is around 12.5v.

 

Nah don't bother. I know a guy running 12's with a B18C5 who is still using the stock STD pump

 

On the Supra pump I did some researching and I will make sure everyone is quoted in the appropriate spot.

First off, this handy chart.


Now, the information.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Unknown &raquo;</TD></TR><TR><TD CLASS="quote">I remember reading a site with the specs on the pump. I don't remember anywhere where it states that it get's 6 volts until boost. Although it did say that it can go up to 16 volts. I think at 12 volts it feeds 265lph, then at 14 volts it was like 280lph, and at 16 volts it gets 295lph. That was a few years ago though.</TD></TR></TABLE>

That is kind of vague so I dug a little bit deeper into it.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dee &raquo;</TD></TR><TR><TD CLASS="quote">I guess some of you guys are trying to have a cockfight with fuel pumps because physical size means very little when comparing intank fuel pumps. We have been discussing the Walbro/Supra TT pump battle on RX-7 boards for years and the Supra pump only outperforms the Walbro when the Supra pump is hotwired at 14v while the Walbro is running at 12v . The lifespan of the Supra pump also suffers when you wire it at 14v. If you are making serious HP it is best to run dual intanks or a single external tank.</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gritsack &raquo;</TD></TR><TR><TD CLASS="quote">at higher fuel pressure the walbro flows more...theres been several of cases with supras with dual pumps, leaning out in full boost with 2 stock pumps, when they changed to walbros with all the rest things the same it fixed the problem.
also stock supra pumps dont like to be run at 12v all the time, they tend to wear out quicker and get hot at constant 12v and fuel pressure drops (lean out+high boost=kaboom)

another thing is the supra pumps draw alot more current then the walbros

fitment is another thing, even though the supra one is physically bigger, that doesnt mean it flows more as seen above....all these downfalls should be taken into account really only if you are making some serious power and at the tail end of the pumps flow capabilities. if you are only making around 300-400 the supra would probably be a great option, especially when you look at reliability associated with a factory denso part.

</TD></TR></TABLE>

And in conclusion, the Supra has it's place, just not a very steady and reliable place

 

190+whp on a stroked b16 and i am still using my 145k dx pump with no issue. it generates more than enough psi.

 

Cool...thanks..I was pretty sure it would be ok.
We got it started last night..the solid light on the ecu is because a bad chip,wouldnt rev passed 3250..Switchd to a to crx si ecu and it revved a little crappy but threw no codes.
Got another question though if anyone knows.I will probably just figure it out on my own tonite,but could save some time if I get an answer first.When its idling and I stomp on the gas it try's to die out,but if I ease into the gas first than go wot its ok,but with the si ecu it still revs crappy and I hear the detonation.It wont go to 100% throttle without trying to die...80%max according to the vafc.Ive switched the tps wires and its the same either way.Im running it on a crx si distributor which I just took off of another b16a crx where it revved fine.The ignition and cam timing are dead on,but it seems like timing is severly retarded when yuo stomp on the gas.Anyone know what that may be?