So I have been working on a turbo build for my civic. Has the stock fuel pump but I have a b18a1 that is soon to be running 15lbs of boost on a t25 turbo. I have close to 1000cc inj (I presume, long story) Will I have to buy a bigger fuel pump just quite yet? I would like to have a 300horsepower limit (Yes, I have the internal work to handle it) or will I lean out far before I get there?

 

OMG. YOu should have ALREADY bought a higher volume pump. And you have "close to" 1000cc injectors or you have 1000cc injectors? And a T25 is kinda small for a B16.

 

****, that bad? I hate to be ignorant but is there a way I can flow test it? I have reason to believe that the motor that I pulled out was boosted at one point in time.

 

Flow test what? The injectors? Do you not know what you have? How are you going to tune it? Or get a basemap for it? And keep that T25 if you don't mind the power dropping of at about 6k.

And it was boosted prior with the stock pump?

 

um actually it's a b18a, and yes I don't know for sure that they are 1000ccs just my guess. Yeah it was what was available at the time I will upgrade to a gt35 later on.

 

well b18a only revs to 7k (stock valvetrain) so I'm not worried about the power band tbh. And I would ship the inj off to get flow tested just dont have the time nor the patience. And yes I believe it was boosted on stock fuel pump or atleast a fuel pump that resembles it.

 

Do the injectors have any markings on them?
You can't flow test injectors if you have no patience. Do you what know you would need to do it in terms of a setup? Here's an example. Crude and not as accurate as places that do this kinda thing for a living. Send them out and it would only cost you $50 to do it.
Don't have the patience? Then you won't have it to put something like this together.
http://fuelinjectorclinic.com/flow-testing

 

If you don't know what the injectors flow, you have to send them off and have them professionally tested. Also, if you are that unsure about your hardware, it would be a good idea to have them professionally cleaned while they're out. If you don't have time or patience, you shouldn't be fooling with a turbo in the first place.

Yes, you need a bigger fuel pump. You don't seem to have half of a clue what you're getting involved in. We have an F/I section - you should go there, do not post, and read the FAQ sticky.

 

my inj isn't my concern it is the fuel pump

 

They should be. Like I said, how will you basemap/tune this thing if you don't know the rates of the injectors?

 

Then I've already answered your concern. Your stock fuel pump can't handle what you're wanting.

 

Anyone with experience can easily tune the motor without knowing the exact injector size....

As other have already said if the pump is stock you will need to upgrade.

 

Granted. But I'm pretty sure you can't do it with a basemap sight unseen. Mind you, I don't tune, so that's just pure speculation on my part.

 

Very true. You can tune without knowing injector size because it really doesn't matter. But if you are doing any sort of basemap you'd really want to know the relationship to stock size or you'd just be guessing and hoping.

To answer the original question: Upgrade the fuel pump. Walbro 255 lp fuel pumps are <$100.

 

Troll post !

 

And a CNT Racing 300 pump is even cheaper than that, and flows better

 

$89.99 from their website. I've never heard of them. Bosch and Walbro seem to be the popular brands on here. $79 shipped for a 255 lp Walbro through one of the many HT sponsors.

It's all preference, but I'd upgrade to a 255 LP Fuel pump regardless of brand.

 

You wouldn't want to use an eBay one, they don't flow anything like name brand 255lph pumps.

you seriously need to read the faq, you can't do much of anything other than mild NA bolt ons with the stock pump, hell even the NA guys step up to a 255lph pump.

 

Not entirely true. Knockoff 255's have the flow (and in some cases, better flow), but their voltages are inconsistent, and they don't have bypass valves. It's still a bad idea to use a knockoff 255, just not for the reasons you mentioned.

 

Careful non name brand whoring over here is frowned upon.

I don't run knockoffs just sayin

 

Derp, yea the knockoff pumps have retarded high amperage draw and no bypass valve, so if you don't cook the wiring you'll eventually cook the pump.

 

Eh, the amperage draw is within tolerances to not cook wiring, and about on par with most high-flow pumps on the market. The problem with the amperage on the knockoffs is that it's painfully inconsistent, which makes it a pain in the *** to tune. You need to maintain steady amperage to maintain steady fuel pressure, and you need to maintain steady fuel pressure for a good tune.

There's also the issue of heat. Higher amperage draw = hotter running fuel pump = hotter fuel = higher IATs = lower power. We're talking minimal differences on that front, but the real pump runs lower ameperage, and lets a damn good tuner squeeze out that extra 1 or 2 BHP. If this were the only problem with it, I'd have no problem running one in a non-track-dedicated car, but the inconsistent amp draw is a HUGE killer. Amps spike, and you spray too much fuel. Amps crash or flutter, you don't spray enough, and you start detonating. **** that.

 

Yup and considering that most don't upgrade to larger wiring and relays, the stock wiring simply can't handle it.

I've seen more than one car burst into flames with a big pump on stock wiring.

the main issue is that the knockoffs have a huge amperage jump at higher pressures, so anyone making decent power could potentially have a serious issue.