Walbro 255 Discussion

[pitbullowner_2]

Would I need the rewire kit I get this?

http://cgi.ebay.com/ebaymotors/Walb...33555QQitemZ8077317252QQrdZ1QQsspagenameZWDVW

Also how much do you think my gas mileage is going to go down after this install?

 

[CanadianTSi]

No and it shouldn't really change.

Just be sure to get an Adjustable FUel Pressure Regulator if you go with the 255.

 

[DGajre777]

That is a 255HP pump. It flows more than a regular 255 pump. http://www.roadraceengineering.com/fuelpumpflowrates.htm

Get a regular 255 pump and an AFPR
- http://cgi.ebay.com/ebaymotors/Walb...goryZ33555QQihZ019QQitemZ8077317252QQtcZphoto

And if you don't want to get an AFPR, get a 190 pump.
http://cgi.ebay.com/ebaymotors/Walb...goryZ33555QQihZ019QQitemZ8002238476QQtcZphoto

Which turbo do you plan on getting?

 

[djseclipse]

no man, you dont have to have the rewire kit, but it helps supply better voltage to the pump. the kit i bought comes with relay and 10 gauge wiring straight from the battery. pretty cheap, might as well do it while you are in there. i have not noticed any less gas mileage since my install. bought my rewire kit on ebay, just search eclipse fuel pump rewire.

like canadiantsi said def. get a afpr, i didnt have one at first, car ran like crap with raw fuel coming out the exhaust. but now runs real good after afpr install.

 

[DGajre777]

This will answer you rewire question -
http://www.roadraceengineering.com/fuelpumptechtip.htm

Here's a fuel pump rewire kit -
http://linux.forcedperformance.net/...e_Code=FP&Product_Code=FPRK&Category_Code=DSM

And instructions to rewire on a 2G -
http://www.forcedperformance.net/fprk2g_install.aspx

Running without an AFPR on a 255 pump will cause fuel overrun, which will result in a stalling or bogging condition when you decelerate or when you are at idle.

 

[TSIMonsteR]

http://www.importevolution.com/product_info.php?cPath=91&products_id=2373

Check out that link before you buy the ebay unit. Its $270 for the Walbro of your choice, Aeromotive AFPR and Install kits for both. Sweet deal IMO. Mighgt save you a few dollars and some shipping costs

 

[chicagoavenger]

This will answer you rewire question -
http://www.roadraceengineering.com/fuelpumptechtip.htm

Here's a fuel pump rewire kit -
http://linux.forcedperformance.net/...e_Code=FP&Product_Code=FPRK&Category_Code=DSM

And instructions to rewire on a 2G -
http://www.forcedperformance.net/fprk2g_install.aspx

Running without an AFPR on a 255 pump will cause fuel overrun, which will result in a stalling or bogging condition when you decelerate or when you are at idle.

40 bucks for a rewire kit? there on ebay for 20 shipped.

 

[DGajre777]

40 bucks for a rewire kit? there on ebay for 20 shipped.

Everything is cheaper on ebay.

 

[dalatinromeo]

Thats where I got mine from.

I got my walbro 255 hp and b&m fuel pressure gauge from extreme psi($120), ss line aeromotive afpr kit from import evolution($209), and my rewire kit from ebay($20). All the prices were including shipping.

Now to answer the question asked , no you don't need to rewire the pump; but it should be done, because it helps sending the correct voltage to the pump.

I can't answer about the gas mileage, havent installed it yet.

 

[pitbullowner_2]

so i should get the rewire kit and also a afpr. how easy is it to install the afpr, and adjust. is there an easy way to tell how to adjust. i'm letting a mechanic put the fuel pump in b/c the fittings are ridiculous i cant break them loose at all. but i will install the afpr just dont know how to tell how much to adjust. and i'm going to get a 16g in a few months just want to get some other things out the way first. also i want need to tune it after the afpr?

 

[pitbullowner_2]

how come i wouldnt need a afpr if i got a 190 instead? do you think that i would need to get a 255 or is it just overkill even with the 16g and some bigger injectors sooner or later? i thought since they were the same price you might as well get the 255 right?

 

[pitbullowner_2]

what do you think about this afpr

http://cgi.ebay.com/ebaymotors/Mega...Z6763QQitemZ8073518756QQrdZ1QQsspagenameZWD1V

i heard they were good

 

[DGajre777]

how come i wouldnt need a afpr if i got a 190 instead? do you think that i would need to get a 255 or is it just overkill even with the 16g and some bigger injectors sooner or later? i thought since they were the same price you might as well get the 255 right?

You don't need an AFPR with a 190 because the 190 pump does not overrun the stock fuel pressure regulator (FPR). The 255 does overrun the stock FPR which is why you need an A (adjustable) FPR.

For a 16G or even an EVO III 16G a 190 is enough. Check CanadianTSi's profile, he was the first one to respond to your thread, he is running a 50 trim with a 190, so there is no reason for you to get a 255 + AFPR unless you plan on going bigger later. For a regular 16G, 190 and 550cc injectors are enough, for an EVO III 16G if you want to max out the turbo get a 190 and 650cc injectors.

Yes, the 190 is the same price as the 255, but you can use the 190 without an AFPR and you need a AFPR with the 255. The total cost for the 255 ends up being more with the AFPR cost added. If you are not sure that the 16G will be your last turbo get the 255 and AFPR.

 

[nightspeed87]

im trying to make that discision right now as in gone and get the 255 and wont have to look back towards the fuel pump again, but then ditch out the extra money needed for the afpr, or just get a good 190 and be ok. Im on a tight budget since im on a engine rebuild, and honestly I dont think Ill be modifying my turbo for a good minute and I only have a 14b, and if I did I wouldnt go bigger than a 50 trim, and if I were to get a mitsu turbo I think id consider a 18g, and with proper tuning, the right size injectors, the 190 and a Afpr( eventually in the future to keep initial cost down for now, ) I should have all I need for a 16g, or a 18g am I correct. ( Not sure about how much a 50 trim pushes, Im sure a lot though. ) Any suggestions on what I should do.

 

[DGajre777]

Last time I checked CanadianTsi ran in the 11s with a 50trim turbo and a 190 pump. Not sure how much psi he was running though. An 18G flows about the same as an EVO III 16G for which a 190 will be enough.

 

[nightspeed87]

so basically as long as i dont go bigger than the 18g air flow capacity I should be ok with a 190/ afpr ( which will be gotten later due to lack of money ) and larger injectors correct.
And therefore your saying with my set up just get a 190 and not to worry about a 255 since i wont be able to get a afpr right away.

Also when my engines done being rebuilt i will be running the n/ts fpr which has 10 more base psi than a stock gst's fpr therefore I will be pushing 10 more psi on the 190 is that going to cause over run in your opinion, and will I still be ok. ( I will have a hacked mass and knN filter if that helps the equation. )

 

[DGajre777]

so basically as long as i dont go bigger than the 18g air flow capacity I should be ok with a 190/ afpr ( which will be gotten later due to lack of money ) and larger injectors correct.
And therefore your saying with my set up just get a 190 and not to worry about a 255 since i wont be able to get a afpr right away.

Also when my engines done being rebuilt i will be running the n/ts fpr which has 10 more base psi than a stock gst's fpr therefore I will be pushing 10 more psi on the 190 is that going to cause over run in your opinion, and will I still be ok. ( I will have a hacked mass and knN filter if that helps the equation. )

With a 190 pump you can get away without using an AFPR because the 190 will not cause fuel overrun. If you get a 255 pump, it will overrun the stock fuel pressure regulator which is why you need an adjustable FPR to turn the fuel pressure to base fuel pressure.

The stock FPR and good aftermarket AFPRs increase fuel pressure on a 1:1 ratio, does this n/ts FPR rause fuel pressure on a 1:1 ratio?

 

[CanadianTSi]

11.8 at 121 on Pump Gas with a 190 on the Stock Wiring

 

[DGajre777]

11.8 at 121 on Pump Gas with a 190 on the Stock Wiring

What psi? and was this with cams?

 

[CanadianTSi]

24psi, FP2X cams.

 

[nightspeed87]

wow thats pretty good. Im probably going to run a 190 until I get money for a afpr and just toss in the supra fuel pump after that. Yea i just read that the n/ts fuel pressure regulator flows 10 psi "more" than a gst fpr. So how will this go under consideration with a 190, will that then cause fpr over run or will that lessen the chances since I have 10 more fuel psi with that regulator because im not truely understanding how fpr over run works. And are 190s loud like 255s can be'?

 

[DGajre777]

wow thats pretty good. Im probably going to run a 190 until I get money for a afpr and just toss in the supra fuel pump after that. Yea i just read that the n/ts fuel pressure regulator flows 10 psi "more" than a gst fpr.

If it just increases base pressure to by 10psi, it probably doesn't adjust fuel pressure on a 1:1 ratio. This would mean that it is in the crappy B&M FPR category. If your goal is to get a supra pump, get an AFPR that adjusts on a 1:1 ratio. This is important.

 

[nightspeed87]

ok will do. ( I have to learn what you mean about the 1:1 ratio though, im not sure I follow you on that. And yea it probably just increases 10psi and performs on a b and m fpr level . But there are some guys running around with n/t regulators for the added pressure because I guess since its something that can be salvaged at a junkyard for next to nothing, its the nxt cheap mod in fpr before buying a afpr in my assumtion.

 

[DGajre777]

ok will do. ( I have to learn what you mean about the 1:1 ratio though, im not sure I follow you on that. And yea it probably just increases 10psi and performs on a b and m fpr level . But there are some guys running around with n/t regulators for the added pressure because I guess since its something that can be salvaged at a junkyard for next to nothing, its the nxt cheap mod in fpr before buying a afpr in my assumtion.

It will cause more damage than do any good, I wouldn't get it. There's a huge thread about the B&M FPR on here and how it is not good.

About 1:1 ratio:
1G Turbo 5spd - Bass Fuel Pressure 37 psi
2G Turbo - Bass Fuel Pressue 43 psi
1G Non-turbo - Bass Fuel pressure 47 psi

If you have a 2G turbo and you are at 0 psi of boost, your base fuel pressure is 43psi. When you boost at 10 psi, the fuel pressure is 53psi. When you boost at 20 psi, the fuel pressure is 63 psi. This is the 1:1 ratio, for every 1 psi increase in boost, the stock FPR or a good AFPR will increase fuel pressure by 1psi. With a B&M unit, you might be at 43 psi fuel pressure for 0psi of boost but at 20psi of boost, you might only get 50 psi of fuel pressure (I'm making this number up)since it doesn't do the 1:1 ratio increase.

 

[nightspeed87]

It will cause more damage than do any good, I wouldn't get it. There's a huge thread about the B&M FPR on here and how it is not good.

About 1:1 ratio:
1G Turbo 5spd - Bass Fuel Pressure 37 psi
2G Turbo - Bass Fuel Pressue 43 psi
1G Non-turbo - Bass Fuel pressure 47 psi

If you have a 2G turbo and you are at 0 psi of boost, your base fuel pressure is 43psi. When you boost at 10 psi, the fuel pressure is 53psi. When you boost at 20 psi, the fuel pressure is 63 psi. This is the 1:1 ratio, for every 1 psi increase in boost, the stock FPR or a good AFPR will increase fuel pressure by 1psi. With a B&M unit, you might be at 43 psi fuel pressure for 0psi of boost but at 20psi of boost, you might only get 50 psi of fuel pressure (I'm making this number up)since it doesn't do the 1:1 ratio increase.

Thanks for the help.
well thats definitly a consideration what your saying. Thats the only fpr I have to use for right now anyways though i have no choice until I can get the money to get another. I may have to see if I can hook up a fuel pressure gauge to test it? Will the stock fpr, or fuel rail accept fittings to plug in a fuel pressure gauge?
Does a stock 1g gst fpr have the 1:1 ratio like your talking about?
And by it not keepin the ratio are you suggesting it may lean out from lack of pressure at certain boost levels? Ive talked with one of the wisemen about that regulator and all he mentioned was he ran a n/t regulator back in the day for a while and never had any problems and that it just raises base pressure 10 psi like said, but he never mentioned anything about a 1:1 ratio. I wonder why theyd put 10 more psi on a n/t?