Stewart Performance water pump vs. factory, pics inside

MustangLife · Jul 18, 2007

I just installed the Stewart EMP Performance water pump from Steeda today on gt. $149 for the pump. Pics below. New pump is on the right. The blades are about twice the length than stock.

Kilgore Trout · Jul 18, 2007

any tips on the install?

darkside03gt · Jul 18, 2007

looks nice. with those long blades it will flow alot more water then stock looks like a good upgrade for anyone with FI

MustangLife · Jul 18, 2007

Install was pretty much straight forward. Pull the water pump pulley off and and four bolts on the water pump. It was a pain in the ass to break away from the blockthough. I guess after 4 years being on there, it was stuck pretty good. Had to use a thin bladed craftsman screwdriver to and pry in a couple different spots and jerk and tug.

I'm running 25% antifreeze 75% distilled water and a bottle of water wetter.

I'll test it out tomorrow to see temperature differences.

Josh

dew22 · Jul 18, 2007

Do you know how much it flows, or how much the stock one flows? GPMs?

Anyone?

DropTopPony · Jul 20, 2007

I picked one of those up a few weeks ago and i'm gonna put it in with my Fluidyne radiator.
From what i read they only take 2-3hp to run compared to 4-6hp for the stock so besides the extra flow benefit it will net you a hp or 2.

'01 Steed · Jul 20, 2007

Can you say "cavitation"? There's a reason Ford designed the pumps the way the did. Bigger isn't always better, boyz.

5spd GT · Jul 21, 2007

How is the bigger blades (more pressure points for the coolant/water) going to net more horsepower with more drag?

Cavitation is the 'formation of vapour bubbles within a liquid at low-pressure regions that occur in places where the liquid has been accelerated to high velocities, as in the operation of centrifugal pumps, water turbines, and marine propellers. Cavitation is undesirable because it produces extensive erosion of the rotating blades, additional noise from the resultant knocking and vibrations, and a significant reduction of efficiency because it distorts the flow pattern. The cavities form when the pressure of the liquid has been reduced to its vapour pressure; they expand as the pressure is further reduced along with the flow and suddenly collapse when they reach regions of higher pressure. The sudden growth and collapse of these vapour cavities cause the extreme pressures that pit the metal surfaces exposed to the cavitating liquid.'

'01 Steed · Jul 21, 2007

Very good! You get a gold star for the day! Bonus points on the "more drag = less horsepower" comment.

For the life of me, I can't see how this could be true.

COramprat · Jul 21, 2007

I think I'd go with an electric water pump if I were looking to gain HP.

Hopefully Stewart has done enough R&D to negate the problems you describe. Do you really think Ford put much consideration in a water pump? I'd think they just threw on whatever company came in with the best price.

'01 Steed · Jul 22, 2007

COramprat said:
I think I'd go with an electric water pump if I were looking to gain HP.

Hopefully Stewart has done enough R&D to negate the problems you describe. Do you really think Ford put much consideration in a water pump? I'd think they just threw on whatever company came in with the best price.

Absolutely! I don't 'think' so, I 'know' so. It's what I do.

While it may be true that Ford (or any other manufacturer for that matter) will cut costs or tend to select the cheapest bidder, that bidder's product MUST conform to all specs set forth by the engineering community. These specs have been developed over countless hours of designing and testing. I tend to believe that Ford's pockets are much deeper than any aftermarket supplier's when it comes to developing components.

+1 on the electric pump!

5spd GT · Jul 22, 2007

'01 Steed said:
Very good! You get a gold star for the day! Bonus points on the "more drag = less horsepower" comment.

For the life of me, I can't see how this could be true.

Thank Britannica...

darkside03gt · Jul 22, 2007

according to steeda the stock water pump starts to cavitate around 4500rpm

white99gt · Jul 22, 2007

lol the only thing that did was lighten your pocket book..
Ive use the stock ford pump for YEARS on my 99 and never had a cooling issue (even shifting it at 7k).

COramprat · Jul 22, 2007

'01 Steed said:
Absolutely! I don't 'think' so, I 'know' so. It's what I do.

While it may be true that Ford (or any other manufacturer for that matter) will cut costs or tend to select the cheapest bidder, that bidder's product MUST conform to all specs set forth by the engineering community. These specs have been developed over countless hours of designing and testing. I tend to believe that Ford's pockets are much deeper than any aftermarket supplier's when it comes to developing components.

+1 on the electric pump!

I've had cooling issues but never due to the water pump. The design of the electric fan was my problem. After I swapped it last year my cooling problems went away. If testing and comforming to a high standard is what Fords R&D is all about...they missed that one. Same goes with that upper intake I had to replace.

I'm not saying aftermarket is any better but if they want to stay in business I'm sure they will do some homework. I'd still have gone with an electric...

white99gt said:
lol the only thing that did was lighten your pocket book..
Ive use the stock ford pump for YEARS on my 99 and never had a cooling issue (even shifting it at 7k).

Where have you been?

white99gt · Jul 22, 2007

Been around.Just ahvent been online much anymore ..Work and family are bigger priorites nowadys..But someone has to keep yall in check ..

the98stang · Jul 23, 2007

'01 Steed said:
Absolutely! I don't 'think' so, I 'know' so. It's what I do.

While it may be true that Ford (or any other manufacturer for that matter) will cut costs or tend to select the cheapest bidder, that bidder's product MUST conform to all specs set forth by the engineering community. These specs have been developed over countless hours of designing and testing. I tend to believe that Ford's pockets are much deeper than any aftermarket supplier's when it comes to developing components.

+1 on the electric pump!

If every one thought Ford made the best performing engine, they would buy it, and leave it bone stock. But why do you think every one buys after market parts? The answer is simple, to gain horsepower, and improve performance. Obviously some parts are extremely sh1tty from the factory, so people replace them. Ford doesn't have any damn money. Their pockets aren't deep. They are millions of dollars in debt. You better believe that right now they are cutting every corner and saving every damn penny that they can. They can't AFFORD to spend ridiculous amounts of money on research and testing. Who do you think is making more money right now, Vortech, or Ford? That's what I thought....

'01 Steed · Jul 23, 2007

Guys, you don't have to cap all over me for what I've said here. Gimme a friggin' break! You believe what you want. You can't base your opinions of how much is spent in R&D on what a company "reports" as profit. Like it or not, Stewart does NOT spend more money on R&D than Ford. Period. You can lump Vortech in there as well.

I said NOTHING about the performance of our engines. But if you want to go there, no problem. Think about what it takes to bring a powertrain to market?? Dealing with the EPA, CAFE, accountants, manufacturing processes, countless suppliers....the list goes on. If all we had to worry about was performance, there would be no aftermarket because you'd have the best performing (power wise) parts from the factory.

As far as Steeda reporting cavitation at 4500....think about that. What is one of Steeda's best sellers to Stangers???.......Bingo! Underdrive pulley kits. Of course they're gonna tell you the stockers cavitate. They want you to buy u/d pullies.

That being said, go ahead and piss away your money on that stupid pump.

dew22 · Jul 23, 2007

Almost every serious road race mustang is running a high flow water pump of some sorts, most of which are far more extreme than this unit. I doubt this pump will have much if any cavitation issues. This probably isn't a good mod for someone wanting extra hp but if you want extra water flow it's a no brainer.

'01 Steed · Jul 23, 2007

And all of those roadracers have upgraded their radiators and such to flow more also.

Stewart Performance water pump vs. factory, pics inside

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