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Old 02-16-2001, 09:32 AM   #1
DeliciouSpeed
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Post Bosch Fuel pumps...

I'm sure it's no sercret that bosch fuel pumps are the best in the world. I have a WRX on order. I wonder though, have any of you 2.5 Turbo guys installed a bosch pump on your car?
And how was it done, inline or intank?

TIA,
Ken
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Old 02-17-2001, 02:42 PM   #2
North Ursalia
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<FONT face="Comic Sans MS">Many of the people here running high boost use the pump from an RX-7 IIRC... haven't heard much use of Bosch fuel pumps in the community.

Brian

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Old 02-17-2001, 03:46 PM   #3
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I guess no one has gotten to a power level where one would be needed. My thing is that they are way reliable. And feed a tone of power and ungodly pressures without fail.
One will go into my WRX, I guess I will be the first.

Ken
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Old 02-17-2001, 03:58 PM   #4
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unless you're planning on going "hardcore" with your power on the new WRX and risk voiding your factory warranty, your factory pump should be fine.

If you're planning on doing major power mods, you can use the Walbro 255lph unit for around $110 or spend $300 for a Holley, BBK, MSD, etc(all rebadged Walbro units).

Direct Drop in so no worries as long as you get the Mustang/Honda/DSM style fuel pump.

You can go to my site for pics.
http://aspen.mwic.org/22lm

BTW, Does converting a 1.8L FWD to a 2.2L AWD turbo qualify as being "hardcore"?
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Old 02-17-2001, 06:15 PM   #5
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The Bosch is WAY WAY stronger than the Walbro pumps. Rallispec calims that the Walbro pumps will max out at 80psi while a Bosch pump will hit 110+. I have seen 110 from my Bosch. It would be SOOOOOO nice if it was a direct drop in like the Walbro, but it isn't so I have mine inline just outside the fuel tank.
Even though Rallispec hails the Bosch, they seem to like the Supra TT pump. I think they like it because that fits in the tank and still kicks a$$
For VERY high power, the Bosch is the way to go.
Tom
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Old 02-17-2001, 07:38 PM   #6
DeliciouSpeed
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Thanks Guys, now that was what I was looking for. I'm sorry, I am, or used to be a Honda guy. Still love them. Anyway, I ran a bosch pump intank in a honda! Here look: http://www.theoldone.com/components/fuelpumps/

If you hang around this site, like I recommend, you will learn a lot. Never mind the fact that it is honda oriented. This guys knows his S-h-i-t. After I have exhausted the bolt on with tunning route, I want this guy to lay hands on my EJ20.

Ken
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Old 02-17-2001, 08:22 PM   #7
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When I dropped the Walbro in the tank of my car I was hitting 95psi before I adjusted my RRFPR, so I don't think the Walbro is limited to 80psi.

I have it down to about 75 psi now under boost and the car seems to like it.
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Old 02-17-2001, 08:26 PM   #8
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Just because it went up to 95 PSI doesnt mean it can sustain it safely. I could hit 80 PSI on my stock pump. Is that safe? Will it last? Don't think so.
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Old 02-17-2001, 09:32 PM   #9
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Well.. I don't know about using them on WRXs, but one of my friends here has a couple of Bosch fuel pumps in his 13B turbo powered RX-3. I guess it's a very good pump, but maybe only for high hp applications. I think it would be overkill on a street driven mildly modified WRX.
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Old 02-17-2001, 10:34 PM   #10
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We are car guys, There should be no such phase as over kill in our book. It won't ever let us down. When you start bumping up the HPs a thing like a momentary drop in pressure could mean the end of the party.
And I like to party, don't want to go home.

Ken
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Old 02-17-2001, 11:09 PM   #11
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You must of had a better stock pump than I did. Mine could only muster 65psi or so. Without changing any settings on the RRFPR when I dropped in the Walbro I was hitting 95psi. The stock pump sucks.
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Old 02-17-2001, 11:49 PM   #12
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That's what I mean Ken.. a Bosch pump is a good pump, and wouldn't it be wasted on a car that doesn't need it? For something that is only slightly modified.. it may not need the capabilities of a Bosch pump. For heavily modded vehicles..yes..use it..because you need it..
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Old 02-18-2001, 12:16 AM   #13
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Guys,

Wouldn't our injectors lock up or at least start leaking with fuel pressures higher than, say 90PSI?

How high can the pressures go before there's a risk of failure?

Ed.
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Old 02-18-2001, 01:24 AM   #14
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Is no one here hard core?
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Old 02-18-2001, 02:16 AM   #15
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Ed,

I agree. I am not running at 90+ psi now, nor was I intentionally. I don't know what the point the injectors lock up or start leaking...

I was just offering up the comparison of pumps in my RS. The stock pump is not very good at supplying the extra fuel pressure that RRFPRs demand.

I am running mine at about 73psi max when under boost now, and the car seems happy

Aaron
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Old 02-18-2001, 11:03 AM   #16
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My 92 Civic Si ran a 12.84 on street tires. It was powered by a GSR motor with the R treatment. It hit 80 PSI no problem, I could have turned it up more even I think. I didn't realy mean for it to get the high. I ran it at 46PSI with stock, 30 with bosch. The larger pump will not only opperate at higher pressures, but it will also supply a higher volume of fuel at lower pressures as well. So you can avoid having to over pressurize the lines and injectors when larger injectors have not been installed.

Ken
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Old 02-19-2001, 02:12 AM   #17
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I have an RX-7 pump in-tank and i'm getting a Bosch inline also.. i don't know if this makes me hardcore or not but i need the extra fuel pressure...
i know someone else who is running a dual-inline pump setup and they love it..
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Old 02-19-2001, 04:51 AM   #18
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i have been using the walbro pumps for a coupple of years now, and i have never had a problem, i currently have a vortec boost sensative preasure riser, and an on the rail pres regulator, i have never had any problems, not one associated to low fuel pres of starvation.

jon 98 rs
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Old 02-19-2001, 11:56 AM   #19
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Like Tom was saying: Bosch is very good for very "High" power applications.

Walbro's 255lph rating will do for most of us on the stock block and is a direct fit.


P.S. I have both fuel pump styles, Walbro and Supra TT and found that the Supra TT fits very tightly into the newer style fuel tanks(98+).

<IMG SRC="http://aspen.mwic.org/22lm/tech-pics/fuel-pump.jpg" border=0>
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Old 02-19-2001, 06:10 PM   #20
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I guess everyone is talking about the Boschfuel pumps that look like a barrel and are external.From my experience they are used as a push pump and not a pull/push pump.
Are people aware that the more fuel pressure you run it slows down the injector due to the pressure behind the pintle.
Tony
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Old 02-19-2001, 08:45 PM   #21
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That was my whole point Tony, I don't like running sky high pressures. The Bosch will allow you to run lower pressures than the others because it flows a lot more fuel.

Aspen, how much is a supra TT pump?
I do have a good friend is a Tech at Toyota, I'll aks him also.

Ken
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Old 02-19-2001, 09:18 PM   #22
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actually, the walbro 255's and the bosch pump model from TOO flow about the same volumes, its just the bosch is better for sustaining high pressures without taking a dump.

running high pressures is a pretty hack way of doing it though.
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Old 02-19-2001, 10:30 PM   #23
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I bought my Supra TT fuel pump used because dealer price is way too high.

I'm also investigating the bosch fuel pumps used in older turbo quattro Audi's for the people that would prefer Bosch for some reason. One of my friend's used the Audi/Bosch fuel pump for his 250hp CRX and did just fine.

line pressure preference or not, both systems will work. It just comes down to a matter of preference.

"Yeah I like using the Purolator oil filter because it's blue and I can't stand those orange colored Frams."
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Old 02-20-2001, 10:38 AM   #24
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I'm not sure I know what I'm talking about, but regarding the statement above that higher pressures slow down the injectors, doesn't the FPR limit the pressure that the injector sees anyway? So if anything wouldn't it just be your FPR (and your fuel lines) that need to bear the burden of a monster bosch pump?
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Old 02-20-2001, 06:04 PM   #25
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Question

What is the voltage at the pump on the sube? IE mitsu and mazda often see a significant drop at the pump vs at the battery (ie 13.8 vs 11.8) which impacts volume and pressure.
www.roadraceengineering.com/fuelpumptechtip.htm

just wondering

Nils
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