LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Electric water pump

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Old Oct 12, 2009 | 11:04 AM
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Default Electric water pump

Does anyone have any comments on the CSR pump? And do I actually need that relay kit that Summit suggests?
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Old Oct 12, 2009 | 11:39 AM
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I run the Meziere and yes you need a relay
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Old Oct 12, 2009 | 11:42 AM
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Thanks. I'm replacing my water pump because it's starting to go bad anyway, but do the electric pumps actually make the engine run cooler?

Besides the relay do I need anything else?
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Old Oct 12, 2009 | 11:44 AM
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+1 for the relay. you will save a few bucks going with CSR a friend of mine has ran a CSR for a few years now and the ONLY issue was how noisy it is. my meziere is over 3 years old and is still unbelievably quiet. yes they do make the car run a lot cooler as they flow as much at engine idle as the mechanicals do at higher RPMs.
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Old Oct 12, 2009 | 11:50 AM
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Originally Posted by stevo9389
+1 for the relay. you will save a few bucks going with CSR a friend of mine has ran a CSR for a few years now and the ONLY issue was how noisy it is. my meziere is over 3 years old and is still unbelievably quiet. yes they do make the car run a lot cooler as they flow as much at engine idle as the mechanicals do at higher RPMs.
Sweet, good explanation. I'm going to take a look at the total costs between the two and order it soon. Thanks!
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Old Oct 12, 2009 | 11:55 AM
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This confused me from the info on the Meziere pump from Jegs...

"Finishing The System: This pump is supplied complete with gaskets and hardware. Factory hardware is reused. There are no other necessary items. "

So what do I actually need a relay kit for?
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Old Oct 12, 2009 | 02:44 PM
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you need the relay to tie into your ignition unless you want to make a manual switch to turn it on and off. i do not believe mine came with one. oh yea you will have to "notch" the water pump housing to fit a CSR pump. my meziere did not require it.
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Old Oct 12, 2009 | 04:15 PM
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I wound up ordering a Meziere pump by itself. It says nothing else is required, so I'm taking that chance.
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Old Oct 12, 2009 | 05:01 PM
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You need to have a relay and a fuseable link. hopefully this will make you realize that you need it.
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Old Oct 12, 2009 | 05:03 PM
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the only thing that is not needed (If you check it yourself routinely) is going to be the LED's
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Old Oct 12, 2009 | 05:41 PM
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I have a CSR pump in my car and I have to say its an awesome piece for the price. Mine came with everything need to install the pump minus the "relay kit" everyone is talking about. As for the "relay kit" i don't think its a must to buy. I built my own harness with a relay and inline fuse. Took all of 15 mins to make and cost 8-10 bucks in parts.
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Old Oct 12, 2009 | 07:03 PM
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Originally Posted by stevo9389
+1 for the relay. you will save a few bucks going with CSR a friend of mine has ran a CSR for a few years now and the ONLY issue was how noisy it is. my meziere is over 3 years old and is still unbelievably quiet. yes they do make the car run a lot cooler as they flow as much at engine idle as the mechanicals do at higher RPMs.
Make sure you tell the other half of the story. Electrical pumps do not vary their flow rate with RPM - they stay constant. So while they do flow more than stock at idle, they do not flow as much at higher RPMs.
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Old Oct 12, 2009 | 07:52 PM
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why is this relay necessary... how come i cant just hook the positive up (with an inline fuse) to an ignition source so that it runs when ever the key is switched to run?? im not trying to be difficult im asking becuase i ahve to hook mine up soon when the time comes and want to do it right..... thanks... sorry if this is hijacked..
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Old Oct 12, 2009 | 07:55 PM
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Originally Posted by transmaro93
why is this relay necessary... how come i cant just hook the positive up (with an inline fuse) to an ignition source so that it runs when ever the key is switched to run?? im not trying to be difficult im asking becuase i ahve to hook mine up soon when the time comes and want to do it right..... thanks... sorry if this is hijacked..
Because the pump draws more amperage than most stock non-fused links can handle safely.
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Old Oct 12, 2009 | 08:03 PM
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i just read a thread about people using the "air pump" hot lead to power their pumps... now that is a lead that is already fused from the factory.... would this be ok to use since im not going to have my air pump set up anymore or do i still need to run a relay off of that wire... ill use the air pump wire as my ignition source...
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Old Oct 12, 2009 | 09:11 PM
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A lot of people use that fused like and also the air pump relay. Remove the wires leading to the pump and wire in the new ones for the EWP as shown in the diagram. This relay aids in the initial start-up. This is why things are are even done this way from the factory.
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Old Oct 12, 2009 | 09:43 PM
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I already removed my AIR also. So we can just use the wiring/fuse from that, then?
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Old Oct 12, 2009 | 10:32 PM
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Originally Posted by RamAir95TA
Make sure you tell the other half of the story. Electrical pumps do not vary their flow rate with RPM - they stay constant. So while they do flow more than stock at idle, they do not flow as much at higher RPMs.
That is negligible and should have been a given. Make sure you provide the flow numbers on a mechanical pump for comparison. I am sure he is not building a circle track car so unless he likes to drive redlining everywhere its a non issue.
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Old Oct 12, 2009 | 10:45 PM
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sorry for this other question, but i got an ewp from another member here and he also gave me the relay, he wrote down some instructions but im not too sure how to wire one connection, he told me to put the wire in the ignition fuse in the fuse box, how do i do that?? stick the wire in and insert the fuse as well?? or what other way can i wire it up??
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Old Oct 12, 2009 | 11:30 PM
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Wire it through the bottom on a ignition fuse on the downside of the fuse. I'm sure you can find one that is no longer in use. I.e. The air pump fuse and then put the rightsize fuse in
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