This dyno test was done on a small block chevy...and using March Underdrive pulleys...
Test 1 Test 2 GAIN Test 3 Electric GAIN
O.D. U.D. U.D. Electric U.D. vs. Electric
RPM TQ HP TQ HP TQ HP TQ HP TQ HP
3000 390 223 393 224 3 1 396 226 3 4
3200 404 246 409 249 5 3 412 251 3 2
3400 415 269 418 271 3 2 421 273 3 2
3600 418 287 421 288 3 1 424 291 3 3
3800 419 303 423 306 4 3 425 307 2 1
4000 417 317 421 321 4 4 423 322 2 1
4200 416 332 419 336 3 4 422 338 3 2
4400 416 348 420 352 4 4 425 356 5 4
4600 415 364 419 367 4 3 424 371 5 4
4800 412 377 414 379 2 2 419 383 5 4
5000 405 385 407 387 2 2 411 391 4 4
5200 393 390 398 394 5 4 401 397 3 3
5400 383 394 387 398 4 4 389 400 2 2
5600 371 396 375 400 4 4 378 403 3 3
5800 359 397 363 401 4 4 366 404 3 3
6000 345 394 348 398 3 4 356 406 8 8
MAX 419 397 423 401 5 4 425 406 8 8
AVG 402 335 406 338 4 3 409 341 3 3
We will use 6000 RPM as the example...
March Pulleys made a gain of 3 TQ and 4 HP over Overdrive pulleys
Electric Water pump made a gain of 8 TQ and 8 HP over March pulleys
Electric Water pumps made a gain of 11 TQ an 12 HP over Overdrive pulleys!!!
AVG gain across the board...
March Pulleys made a gain of 4 TQ and 3 HP over Overdrive pulleys
Electric Water pump made a gain of 3 TQ and 3 HP over March pulleys
Electric Water pumps made a gain of 7 TQ an 6 HP over Overdrive pulleys!!!
You gain appx 5HP going from stock to March Pulleys on a small block!!!
Basically an electric water pump is most effective at high rpm and the gains are small at street cruising!!
Im sure the numbers go up some with a BB Mopar and people who go the track will benefit from the HP Gain at High RPM..
Also Mechanical pumps flow about twice as much as an electric pump.. I am curious how my 499 will run on the street cause of this because it dont run hot now during summer driving! I imagine the electric fans will come on more from my Be Cool setup to keep temps down???
We will soon see!!! Im gonna keep around my March Pulley and mechanical waterpump for insurance....
Some Comments I found on the Meziere pump by users...
The ad for this pump states that it is suitable for street use, and is rated at 2500 hours. I figured that if I drove the car for 2 hours a day, every day for a year, it would last for over 3.4 years at that rate. That's longer then my factory pump lasted! That's good enough for me. I'll just proactively replace it every 4 to 5 years along with the OptiSpark. (I don't drive my car 2 hours every day of the year.)
All I can say is I absolutely love this pump. At the time of this writing, I've been driving the car around in 100+ degree heat for the last week with the air on high, in stop-n-go traffic, and the engine has yet to get above 190 degrees. (I have the Hypertech 160 degree thermostat installed.) It also provides a noticeable seat-of-the-pants improvement in horsepower, particularly on the top end. Later on I'll rig the fans and the pump so that I can turn them both on without the engine running for some extra cooling at the track. That will be really nice!
Here's a Dyno run that was performed by Morgan MotorSports showing what you should expect from the Meziere Water Pump installation, horsepower-wise. This graph shows about 9.6rwhp gain and 10.7rwtq gain from the install. The faster you turn your motor, the more benefit you receive. It's not a huge amount, but this HP is in addition to the fact that your engine is going to run so much cooler. This really wasn't a HP mod so much as it is a cooling mod. But, every little bit helps!
Re: Electric water pump on strret use
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Been using a Meziere 35 gpm electric pump and two 14" Spal fans on my 540 ci, 649 hp Chevelle for about 10 years now with no worries in the Southeast Texas heat. The only problem I had was when a piece of the lower rad hose spring corroded and broke off, lodging in the pump impeller. Things got hot real quick. I took the rest of the spring out. No problem with hose collapse.
Alternator and power steering pump mounting is an issue with the electric pumps, but March has that covered now.
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Wayne Scott
It's a BIGGER block!
Just a little insight as Electric seems to be a hot ticket these days!!... im sure there are people who had bad experinces... I guees like everything in life ...
I will post all my experinces at the end of summer as I have the meziere 40-45GPM unit... or sooner
StRoKer
