no reason to buy a Walbro 255L anymore
12-01-2010, 10:33 AM
#21
Ya other platforms are already investigating this pump. I also read that it uses much bigger fuel connections compared to the 255. Also read that its the pump used in supercharged LS9 applications. 
Although it does seem to be stamped with the standard GSS341
The DW pump will be priced similiar (~$175) and flow similar to the bosch 044. If that walbro is shown to flow 385l at 110$ its a no brainer. The supra and DSM guys are on it and they try new things, so it wont be long til more info is available.
I just wouldnt buy a 255L until then if you have a built motor and return system
Although it does seem to be stamped with the standard GSS341The DW pump will be priced similiar (~$175) and flow similar to the bosch 044. If that walbro is shown to flow 385l at 110$ its a no brainer. The supra and DSM guys are on it and they try new things, so it wont be long til more info is available.
I just wouldnt buy a 255L until then if you have a built motor and return system
supposed to be some sort of 255 replacement with more flow.
it has reverse polarity of a 255, but everything else looks the same. It is MUCH quieter than a 255.
here is the flow chart on this pump
Last edited by Zivman; 12-01-2010 at 10:35 AM.
12-01-2010, 10:52 AM
#22
the normal high pressure walbro is part # gss342. similar to pt342
more info would be needed on that pump.
here, they say its a protec modified pump and that they will be at PRI.
http://honda-tech.com/showthread.php...5#post43890885
also link here
http://www.dsmtuners.com/forums/vend...044-342-a.html
Forged Performance is going to PRI, so hopefully people will be on the lookout.
more info would be needed on that pump.
here, they say its a protec modified pump and that they will be at PRI.
http://honda-tech.com/showthread.php...5#post43890885
also link here
http://www.dsmtuners.com/forums/vend...044-342-a.html
Forged Performance is going to PRI, so hopefully people will be on the lookout.
Last edited by str8dum1; 12-01-2010 at 11:00 AM.
12-01-2010, 11:23 AM
#23
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Impossible to calculate since every car is different. Hell, my walbro was maxed out at 451hp when some others get their walbro's over 500hp. Everything in the build and car is a variable that effects it.
12-01-2010, 11:49 AM
#25
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so far yes, i have the twinpump now so i'm not going to come close to maxing it now.
yes, it was on a supercharger and it was also on a DD dyno and everyone argues "this one reads high, this one reads low" blah blah. So technically nothing is apples to apples. Hal has had other s/c systems on his dyno get higher than mine also.
yes, it was on a supercharger and it was also on a DD dyno and everyone argues "this one reads high, this one reads low" blah blah. So technically nothing is apples to apples. Hal has had other s/c systems on his dyno get higher than mine also.
12-01-2010, 12:16 PM
#27
My walbro max'd out at 6000 rpms with HKS 1000 cc injectors at 16 psi making 535 whp on a DJ (with a 5AT) - couldn't finish a pull because AFRs would approach 13 no matter what. The greater the injector pulse width I typed in, the more my fuel pressure dropped (down into the 20s). My alternator, fuel, and fuel pump were hot by this time - voltage was 11.6v so that wasn't good either... Complete waste of 2 hrs on the dyno. 
(FWIW, 520 STD on this dynojet equated to a 475 on Sharif's dyno and 505 on Hal's, all at 15 psi but at different times/conditions). I'll be bumping up the voltage to 17v along with the CJM stage 2 hard line, so hopefully that will provide plenty of headroom.
It would be nice to be able to run E85 at the 500-600 whp level with one pump and a voltage booster...
(FWIW, 520 STD on this dynojet equated to a 475 on Sharif's dyno and 505 on Hal's, all at 15 psi but at different times/conditions). I'll be bumping up the voltage to 17v along with the CJM stage 2 hard line, so hopefully that will provide plenty of headroom.It would be nice to be able to run E85 at the 500-600 whp level with one pump and a voltage booster...
Last edited by rcdash; 12-01-2010 at 12:25 PM.
12-02-2010, 09:20 AM
#32
if only it was that easy
they dont fit in the dual pump setup sold by CJM.....
so you'll have to take the SP hanger, 2 pumps, and then the BAP, plus -10AN feed and a new EMS to stage the pumps, or a -8AN return with a bigger FPR
they dont fit in the dual pump setup sold by CJM.....
so you'll have to take the SP hanger, 2 pumps, and then the BAP, plus -10AN feed and a new EMS to stage the pumps, or a -8AN return with a bigger FPR
Last edited by str8dum1; 12-02-2010 at 09:23 AM.
12-02-2010, 10:20 AM
#33
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the thread title is a bit of a misnomer though
a 385 lph pump (at what voltage?) is fine...if you need it
if you don't need it, it's utterly useless, and like many new products, particularly a fuel pump, you may be well served to wait and see what reliability is like before taking a plunge vs a known commodity
the only real way to know is how you guys are doing it...datalogs, to see where you start running out (and what is causing it..injector or pump). It's going to be different for everyone based on a number of different factors
a 385 lph pump (at what voltage?) is fine...if you need it
if you don't need it, it's utterly useless, and like many new products, particularly a fuel pump, you may be well served to wait and see what reliability is like before taking a plunge vs a known commodity
the only real way to know is how you guys are doing it...datalogs, to see where you start running out (and what is causing it..injector or pump). It's going to be different for everyone based on a number of different factors
Last edited by Z1 Performance; 12-02-2010 at 10:23 AM.
12-02-2010, 11:38 AM
#35
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when we started having the rise in a/f ratios no matter how much fuel hal put in he had me watch my fuel pressure gauge while he did a pull. Promptly at 7500 rpms the pressure would drop from the 60's (boost reference) to below 20. It would almost bottom the gauge out.
And also, based on calculations 600 cc injectors will be maxed before a walbro pump.
6 600cc injectors only flow 216 liter/hour therefore the walbro will flow more than the 600cc injectors.
12-02-2010, 01:44 PM
#37
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when we started having the rise in a/f ratios no matter how much fuel hal put in he had me watch my fuel pressure gauge while he did a pull. Promptly at 7500 rpms the pressure would drop from the 60's (boost reference) to below 20. It would almost bottom the gauge out.
And also, based on calculations 600 cc injectors will be maxed before a walbro pump.
6 600cc injectors only flow 216 liter/hour therefore the walbro will flow more than the 600cc injectors.
And also, based on calculations 600 cc injectors will be maxed before a walbro pump.
6 600cc injectors only flow 216 liter/hour therefore the walbro will flow more than the 600cc injectors.
Guess you missed my comment in ashtons thread? The flow rating drops as pressure increases. 255lph is best case.....it only gets worse from there. Your assumption that the walbro will flow more than the 600cc injectors may be incorrect for the actual pressures being used.
Also remember injectors are rated at a certain pressure too. If you increase the pressure at an injector then the cc rating should increase as well.
12-02-2010, 02:12 PM
#38
for reference, here's flow charts. i figured it was widely known that walbros dont do well at high pressures compared to like the bosch 044
6 600s outflow the pump right around 60psi at nominal car voltage. pretty much what you experienced.
6 600s outflow the pump right around 60psi at nominal car voltage. pretty much what you experienced.
Last edited by str8dum1; 12-02-2010 at 02:14 PM.