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RB Reimax Water Pumps - High Flow Designs - Anyone used them?

The Mafia

By The Mafia,
in Engines & Forced Induction

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The Mafia Grand Master

The Mafia

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8 minutes ago, GTSBoy said:

So, capable of more flow. If needed. Which usually is not the case.

Don't worry, I'm with you, I said it earlier. Issues are usually airflow and oil cooling. 

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GTSBoy
GTSBoy

On the stock temperature gauge, if it moves off of the centre at all, it is getting pretty hot. On a proper coolant temperature gauge, anything over a real 110°C is starting to be concerning.

The Mafia
The Mafia

I should probably update my experience too.  I stuck with the stock water pump and changed my Intercooler to a custom made ARE brand with better airflow, then installed a massive oil cooler. It's

The Mafia
The Mafia

I have a 55mm PWR twin pass radiator (tanks on the sides).  I had issues with my cooling system. This is how I fixed it. 55mm PWR Radiator, older 80mm Intercooler, 16 row oil cooler, stock N

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  • 3 months later...
Predator1 Rising Star

Predator1

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Its been a while, but after 4 months, my GrA Reimax waterpump has been installed. I also replaced the GKTech fan with a new OEM R32 Fan. Everything else is the way it was prior.

The reason I went all out was to try fix my annoying(picky) ECT creeping up at idle. It def ran cooler. I noticed that the temps would come down ALOT quicker. Cruising temps on the motorway is around 72-74 for ECT, same as my oil. I have seen the temps down to 67 in the arvo a few times while driving too(its summer time here too).

Has the waterpump made a difference? Yes I think so. 

The other day, I took it for a drive on a HOT day(27-28). Felt so much hotter, plus I purposely drove through lots of traffic. Max ECT was 82.

My ECT temps at idle we ALOT more stable. Prior, it would creep from say 78 through to 82~ in say under 2 mins, and my 2200CFM AC Fan would come on at 85 which would struggle to bring it back down.

Now, the fan doesnt come on. Mind you, I now run a sequential box, and have heat wrapped my downpipe soo..I had a habit of coasting it in neutral everytime(Never used engine braking), but now I have to stay in gear and engine brake all the time which will aid in temps as there's no spark when you decel in gear.

Would it have made the same difference without the box and the heat wrapping? I think it would have. It was my idle temps that was the issue for me, and that seems to be much better(Might be too early to say its fixed).

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Predator1 Rising Star

Predator1

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20 hours ago, joshuaho96 said:

I wouldn't be all that concerned about coolant temps until 90C but sounds like it worked out for you.

As I said, I was never worried about how high my ECT peaked.. but moreso how fast it creeped. Need to do more testing to conclusively say its a closed book.

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

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On 25/01/2023 at 9:26 AM, Predator1 said:

I also replaced the GKTech fan with a new OEM R32 Fan.

I feel this is what made the difference, however my thoughts are subjective and not based on any data on Skylines.

(Did have 3x S15s with overheating issues at the track, told all 3x to put back the OEM fan blade and... Yep no more overheating).

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R3N3 Proficient

R3N3

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Yes, I have also heard the gktech fans are not the best. I have just splurged on an FPG unit, so hopefully that works out well..

The only other thing I can think of would be to go to an electric water pump, which would give you full control of flow at any vehicle speed. I see that PRP have a new RB electric pump that has been released. This is the way I would go when my pump needs replacing..

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The Mafia Grand Master

The Mafia

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On 25/01/2023 at 9:11 AM, joshuaho96 said:

I wouldn't be all that concerned about coolant temps until 90C but sounds like it worked out for you.

90c? 

When racing heavy loaded circuit, I wouldn't lift off until I got to 112 degrees. This was with 600awhp. 

I would ease off at 112c, and it would start dropping back almost immediately. 

90c is nothing. Lots of modern engines run at 100 degrees as standard. 

all the way up to 110 degrees is okay, just start watching it above that. 113c is my hard limit. 

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

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28 minutes ago, The Mafia said:

90c? 

When racing heavy loaded circuit, I wouldn't lift off until I got to 112 degrees. This was with 600awhp. 

I would ease off at 112c, and it would start dropping back almost immediately. 

90c is nothing. Lots of modern engines run at 100 degrees as standard. 

all the way up to 110 degrees is okay, just start watching it above that. 113c is my hard limit. 

Jono living on the edge haha...

I play it a tiny bit safer, just trim the limiter to tell me the car is getting warm. Ain't nobody got time for gauges when you're racing.

image.thumb.png.3c96a52b934add81af6ef65d8220bc2c.png

The Mafia Grand Master

The Mafia

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10 minutes ago, Dose Pipe Sutututu said:

Jono living on the edge haha...

I play it a tiny bit safer, just trim the limiter to tell me the car is getting warm. Ain't nobody got time for gauges when you're racing.

image.thumb.png.3c96a52b934add81af6ef65d8220bc2c.png

haha mate, I definitely don't have time for gauges. 

I get a very big red full screen on my dash alerting me when I'm at 112 degrees, it's a bit hard to miss. 

At 113c, it starts to pull the limiter down. 

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  • 11 months later...
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Predator1 Rising Star

Predator1

Posted
Posted
On 13/01/2024 at 3:57 PM, SiR_RB said:

So these pumps have been out for sale now for some years

 

has anyone here used one and whats the comparison to an oem or even n1 unit ?

I posted one a few replies up. Before I parked her up, I did lots of highway pulls. I def noticed that the ECT was alot more stable. Did lots pulls in high gears to redline and I was def happy. Safe to say my ECT issues were completely fixed.

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