R32 (gtr): N1 Water Pump Vs Standard

[Scratch]

Time to get my water pump changed on my r32 gtr. I'm thinking about paying extra and getting the N1 waterpump installed as a good upgrade. However i've been told by a respectable tuner that the N1's would not work very well under normal driving conditions (in traffic, in the middle of an aussie summer with the airconditioning cranked up) and might cause problems. Apparently i've heard that the N1 water pumps only works well under high Rev's for long durations. Can anyone clarify this for me?

[Topaz]

Heres the 2 side by side:

Your tuner is right in saying N1 pumps don't flow as much as standard in normal driving conditions. If the revs are higher then the quantity of water pumping through the system is not bottlenecked as the standard one would be moreso.

[monga]

I've upgraded to the n1 water pump with my rebuild and spent the extra deffiently will be used with the high RPM shifting at drags or circuit

[CruiseLiner]

mines upgraded to n1 and never had issues with overheating when cruisin around under 4000rpm for over 1200km or so. must admit it hasnt been 40 degree weather though so that will be a test. didnt move 1 degree on the dyno for a 4-5 hour tune session with various loads on the engine so it seems to be fine.

just my 2c worth

[N1GTR]

Mines N1, never seen the water temp go up over normal, even when thrashing it in really hot weather, also in traffic when i use it as a daily, even with ac on, there's no issues

Some will argue with that, but ive never had a problem with the water temp

Hope that helps

[Scratch]

thx for the feedback everyone... picked up the n1 water pump and got it installed today. fingers crossed for the future.

[Scratch]

Thought i'd add this in for future reference incase anyone searches the forums regarding this topic. I've confirmed these few details with a few mechanics who specialize in GTR's:

The real difference between the N1 pumps and standard pumps is the N1 pumps stop cavitation at higher RPM's. One tuner mentioned he had standard GTR water pump on his 680HP GTR without any adverse effects. People with high HP track cars doing endurance runs (holding revs over 5000+ rpms for a good period of time) will see real benefits from a N1 pump. The standard gtr water pump is around AU$189, the N1 is about AU$400. Physically the N1 has a bigger 6 fin arrangement (see pic above) and an extra hole (apparently) the standard GTR pump has a smaller 8 fin arrangement. From my own experience, street driving with the standard pump vs the N1, I've seen no real increase in cooling performance with the N1, its still the almost same as standard. Bear in mind I dont push my car hard at all. I suppose I'll take solice in the fact that if I belt it hard, my water pump wont go