Quick Question: Walbro 255 vs 255HP
#1
Honda-Tech Member
Thread Starter
Join Date: Apr 2005
Location: Pittsburgh, PA, USA
Posts: 1,081
Likes: 0
Received 0 Likes
on
0 Posts
Quick Question: Walbro 255 vs 255HP
Im know the HP is high pressure, but what is most commonly used for a turbo set-up or when do you use the high pressure pump?
Just the regular 255? I think my stock one is going....
Just the regular 255? I think my stock one is going....
#2
Honda-Tech Member
Join Date: Aug 2002
Location: JDM ricer land, CA
Posts: 2,901
Likes: 0
Received 0 Likes
on
0 Posts
Re: Quick Question: Walbro 255 vs 255HP (xtrec02)
for FI use the HP one, this is why...
lets say your using a 1:1 FPR (most all FPR's are), your running 40PSI base fuel pressure, your boosting 25psi, at the top of the run your actual Fuel PSI is 40+25=65psi
lets say your using a 1:1 FPR (most all FPR's are), your running 40PSI base fuel pressure, your boosting 25psi, at the top of the run your actual Fuel PSI is 40+25=65psi
#3
Honda-Tech Member
Thread Starter
Join Date: Apr 2005
Location: Pittsburgh, PA, USA
Posts: 1,081
Likes: 0
Received 0 Likes
on
0 Posts
Re: Quick Question: Walbro 255 vs 255HP (wHOAlly)
what if the whole fueling system right now is stock? still get the HP pump?
well, dsm 450's are on it but stock rail and everything else
well, dsm 450's are on it but stock rail and everything else
#4
I used the low pressure one, and I'm pretty sure thats what a lot of other people used.. When I was researching I found all I needed to know by using the search function.
#6
Re: Quick Question: Walbro 255 vs 255HP (xtrec02)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xtrec02 »</TD></TR><TR><TD CLASS="quote">what if the whole fueling system right now is stock? still get the HP pump?
well, dsm 450's are on it but stock rail and everything else</TD></TR></TABLE>
If you're using DSM's and running a lower boost application the 255lph is perfectly fine. I'm running DSM 450's on 8 psi with a 255lph. I'm sure even more experienced will chime in, but from the graph it looks like if you run 20psi of boost or more you would want to switch. It looks like the blue curve (255lph) starts losing it downhill at 60psi (stock 40psi + 20psi boost). But you could always plan for future and get the HP anyways
well, dsm 450's are on it but stock rail and everything else</TD></TR></TABLE>
If you're using DSM's and running a lower boost application the 255lph is perfectly fine. I'm running DSM 450's on 8 psi with a 255lph. I'm sure even more experienced will chime in, but from the graph it looks like if you run 20psi of boost or more you would want to switch. It looks like the blue curve (255lph) starts losing it downhill at 60psi (stock 40psi + 20psi boost). But you could always plan for future and get the HP anyways
#7
Re: Quick Question: Walbro 255 vs 255HP (BDogggUT34)
I run an 255HP and I would recommend it, might as well get the more capable pump right off the bat IMO... the price difference was very minimal when I bought mine.
Trending Topics
#8
Honda-Tech Member
Re: Quick Question: Walbro 255 vs 255HP (twkdCD595)
either will work fine. as the graph above shows they flow almost exactly the same until 60+ psi. even then the regular is putting out 40 gph at 65psi, plenty of fuel in most cases. but for $10 the HP may be a good investment.
the HP was mainly designed for low ratio FMUs to avoid the use of an inline pump.
ps. both pumps will probably raise your fuel pressure a bit on a stock fuel system (fpr) nothing that cant be tuned for or fixed with an adj. fpr.
the HP was mainly designed for low ratio FMUs to avoid the use of an inline pump.
ps. both pumps will probably raise your fuel pressure a bit on a stock fuel system (fpr) nothing that cant be tuned for or fixed with an adj. fpr.
Thread
Thread Starter
Forum
Replies
Last Post
baphomet
Forced Induction
10
11-30-2003 08:10 AM