at what "psi" or stuff will a 195 walbro be junk

[Mr overkill]

as stated above im running a 195 walbro from my setup and want to know whats its limits are at 15 psi looks like im good but i do wanna climb her to 20

[cordes]

Depending on the age of the pump I would feel comfortable running the pump up to about 18PSI, but I would want a WBo2 to monitor things if I were really going to push it. I would rather have some safety margin that the 255 can provide for $120 rather than a toasted motor.

[Mr overkill]

just checking thats all cause i am going to order a 255 but dont know if it will be in by the time i hit the track in 2 weeks thats all

[gti_7]

just checking thats all cause i am going to order a 255 but dont know if it will be in by the time i hit the track in 2 weeks thats all

You probably know this, but make sure if you order a new 255 to get the "high pressure" one over the *regular* unit.

bernie

[turbovanman²]

195 should take you to 20 psi easily. The stock output is around 170 so you have a bit more over stock. I managed 22 psi on a stock pump and stock injectors with cold starts but with +20's, pig rich.

[moparzrule]

It's not a certain PSI but a certain powel level that makes a pump not flow enough. Although PSI has something to do with it since it's a 190 LPH, let me explain.
The 190 LPH is probably safe up to about 300 WHP, maybe a little more. You have a pretty good setup. The problem with the 190 is that the flow falls off a lot with high PSI, the high pressure 255 flows WAY more at the higher PSI's. So the more boost you run, the less the pump flows because the fuel pressure is increased.

[moparzrule]

195 should take you to 20 psi easily. The stock output is around 170 so you have a bit more over stock. I managed 22 psi on a stock pump and stock injectors with cold starts but with +20's, pig rich.

Simon thats not a very good comparison. He's making way more HP per pound of boost. 15 PSI on his setup needs more fuel than 22 PSI with the setup you had.

[turbovanman²]

Simon thats not a very good comparison. He's making way more HP per pound of boost. 15 PSI on his setup needs more fuel than 22 PSI with the setup you had.

Yes, but showing an example of what a stocker can do. ;)

[moparzrule]

What good does comparing a stocker to a hybrid with a log header and ported everything? Extreme apples to oranges.

[turbovanman²]

What good does comparing a stocker to a hybrid with a log header and ported everything? Extreme apples to oranges.


Never mind.

[moparzrule]

Simon I understand exactly what your point is, but in what way does an example of a stock setup help a guy that has almost nothing thats stock?
Your statement of ''195 should take you to 20 psi easily'' is dangerously false. Yes it will no problem take a stock style setup to 20 PSI of course, but a stock setup at 20 PSI will be making 250 or so WHP, his setup probably makes 350 WHP at 20 PSI given his mods. I seriously doubt a 190 walbro will be adequat for 20 PSI on his setup, very dangerous and I personally would not risk it.

[turbovanman²]

A 190 pump flows alot more than you think. He wants to do 20, I know his setup and I think he will be fine. Would I keep doing it, no, but for now, as long as he keeps an eye on his gauges, he should be fine.

[moparzrule]

I will have to find that chart again, the 190 is barely an improvement over stock in fact in the higher PSI's I believe it actually flowed less than a stocker. I thought it was on one of gus's old pages but I can't find it.

[moparzrule]

Found this, has a chart 1/3 of the way down the page comparing the 190 to the 255 and the 255 HP.
http://www.ztechz.net/id5.html

Look at the 12 volt chart because the voltage by the time it reaches back to the pump is only 10-12 volts probably even though it starts out at like 14 at the ASD.
At 70 PSI fuel pressure (15 PSI boost with a 55 PSI static) the 255 HP flows double the amount that a 190 flows.

[Mr overkill]

i am going to be ordering mine from chris so i know it will be the high flow and a REAL one

like i said the only reason i asked is first time at the track pushing 16-17 psi my rgts would creep and i had the fuel press bumped i figured i was starting to lose pressure


No biggie just though i would ask




CHRIS ring ring ring ring ring ring


Yes alex


send me a 255hp


ok alex



lolol

[cordes]

Using some calculations I found that a 195lph pump is adequate for a motor pushing 325 HP with a BSFC of .48 at 20PSI. At 22-23PSI you would be pushing it to the max it could flow to support the power.

[moparzrule]

2 problems, it's 190 LPH not 195. Second, the 190 LPH rating is at 13.5 volts, which our pumps will not see. Look at the charts in the link I posted.

[cordes]

2 problems, it's 190 LPH not 195. Second, the 190 LPH rating is at 13.5 volts, which our pumps will not see. Look at the charts in the link I posted.

I stand corrected. However, the only thing that your point changes is that a 190LPH pump will do all the things I said which makes the 195LPH pump even more capable. Thanks for bringing that to my attention. :nod:

[moparzrule]

I am not aware of any 195 LPH walbro pump, only seen 190's. Where is a 195 purchased?

[cordes]

I am not aware of any 195 LPH walbro pump, only seen 190's. Where is a 195 purchased?
I really don't know. You would have to ask the original poster about that.

[moparzrule]

Anyway, the WHOLE point is that this is a better safe than sorry situation, and I think the thread starter understands that.

[cordes]

Anyway, the WHOLE point is that this is a better safe than sorry situation, and I think the thread starter understands that.

I agree entirely. Especially since the HP calculations at a given boost level that people were using in this thread were very optimistic IMO. I took a little off of them when I made my calculations, but it would take a killer setup with a low BSFC to make the 190LPH pump a good choice for the long haul.

[moparzrule]

I really don't know. You would have to ask the original poster about that.

I believe he was just mistaken :)

[moparzrule]

I agree entirely. Especially since the HP calculations at a given boost level that people were using in this thread were very optimistic IMO. I took a little off of them when I made my calculations, but it would take a killer setup with a low BSFC to make the 190LPH pump a good choice for the long haul.

Perhaps I was a little optimistic I will agree with that. But you never know, he says stage 2 head, that could mean too many different things as far as how much the head is really ported. But he's got a TU header, everything's ported, 3'' exhaust, hybrid turbo, basically he does have the potential to make the 350 WHP at 20 PSI boost that I mentioned. I know I averaged 7 HP per pound of boost on my old setup, but I had a mildy ported stock valve G head, and super 70 turbo with .63 stage 1, an untouched 2 piece intake, and only a ported stock manifold. His could gain 10 HP per pound of boost with that setup. BTW I made 270 WHP with 19 PSI on my setup just for reference. So at 20 PSI if I was doing 277 WHP, and his setup makes 3 more HP per pound of boost than I was, that wold be 337 WHP but then again his engine would be making more power than mine in a naturally aspirated state which means more on top of that. So, 350 WHP is not out of the question.

[Directconnection]

Depending on the age of the pump I would feel comfortable running the pump up to about 18PSI, but I would want a WBo2 to monitor things if I were really going to push it. I would rather have some safety margin that the 255 can provide for $120 rather than a toasted motor.

I agree.... but I have seen a stock, 130,000+ mile, 17 year old, orginal to the car pump make 271whp. I wouldn't reccomend it one bit, but that should tell you something. (3-bar with +40s)