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Danny

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Discussion starter · #1 ·
I want to upgrade my fuel pump and am leaning towards a Walbro 190lph. I don't want to go the route of Walbro 255hp because I've heard I would need an AFPR...is this correct? Also I would think the 255hp would cause my car to run overly rich and hence lose power. So back to my original question, would a Walbro 190lph be sufficient to provide my fuel needs on a small 16G@17-18psi?

Thanks,
Danny
 
i can answer one of them, and give you an opinion from what i have heard. The Walbro 255will need an AFPR if it is the high pressure. most people will say this, but some will say no. the 190 is the same as a 3KGTVR4 fuel pump, and from what i have been reading it will support one.
 
WHat size of injectors? What amount of horsepower do you want to support (IE, do you have other mods)? If you can get your hands on a flow data sheet for the walbro 190lph (RRE's website), you can calculate the amount of horsepower it can support if you know your brake specific fuel consumption (.60-.65 on a turbo engine such as a 4g63), injector flow at fuel pressure level (visit RC engineerings website). You also have to allow for the pressure drops across the fuel line leading to the fuel rail. So, utalize the fuel pressure at the fuel pump, or just allow for a large margin of saftey (visit the vfaq.com website, and look for the stevetek fuel system mod to get a general idea of the pressure drop on the OEM fuel system).

Or, more simplier, you should be fine.
 
Hey cool little A/F site...Danl I just have 1 or 2 questions about that A/F calculation..First off what's the difference b/w 14.7 and 12.8 A/F Ratio...and how many lph does a stock 1g awd fuel system flow? And air temp is just environment temp right? And what is volumetric efficiency....6-.65?
 
NOt sure what the stock fuel system flows, but the RRE site has the stock fuel pumps flow before and after a rewire. "T/E/L turbo stock pump, GVR4 and 323GTX too:
$20 used good

(1G and 2G both even though they are different sizes)

part #s: -0510, -0153, -0670, -0440, -2020, -0022, -2760 :

100 lph @43psi @12v
70 lph @58psi @12v


140 lph @43psi @14v
110 lph @58psi @14v "

- Roadraceengineering.com



14.7 a/f ratio is the perfect and complete combustion of fuel with air. Under WOT conditions, its safer to run richer. In boosted applications, you have to run richer yet.

Air temp is environment as far as I can tell.

As far as VE is concerned, I've yet to come up with any hard numbers. From the little bit i've spent building a 4g63 engine on desktop dyno 2000, at the torque peak it is about 90%, and at the hp peak it is about 80-85%. Now, how do you intrepret this? VE when in boost, or VE when n/a, and then calculate with boost? I've seen it done both ways, and I'm not sure how the calcuations are done on that page.

THose calculations are not exact, but that should go without saying.
 
Discussion starter · #7 ·
very, very good feedback so far...thanks for the input guys. It looks as if I will be just fine running the rewired 190lph on 450's while suupporting a small 16G@17-18psi. Keep in mind that I do not have an AFC.

Danny
 
Hell yeah. A 190lph pump will flow about anything the 450's could throw at them. I'm running about 54psi of fuel pressure at allmost 100% duty cycle on my 450's on just a rewire. I'm on the edge baby!
 
so is a Denso fuel pump capable of flowing 150+LPH @ 43psi not a good choice for a small 16G setup. i planned on keeping the 450's for the rest of the winter and spring. after that i may (or will) move to bigger injectors and an SAFC plus logger.
 
Airman said:
I have the Walbro 190 (rewired) with 550cc injectors and I'm running my 18g @ 19-20psi without a problem.
Good to know since I plan on pushing my 18g in the same direction.

What 1/4 mile times do you have with the 18g? My best was done on 17psi with 101 octane.
 
V8SpankR said:


Good to know since I plan on pushing my 18g in the same direction.

What 1/4 mile times do you have with the 18g? My best was done on 17psi with 101 octane.
I haven't had a chance to run the 1/4, but I'll be trying the car out with a Gtech sometime soon. The car is probably capable of mid to high 12's, but my not so quick shifting tranny and bottlenecking stock SMIC will probably limit me.
 
My best on the G*Tech was a 13 flat. I sure hope to run my car at sea level some time since if I can nail close to a mid 12 up here I should hit a high 11 down in Texas or Florida.
 
rewire the walbro 190 and its plenty for 16-17psi on a small16g.
 
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