Jump to content
SAU Community

Recommended Posts

I've just experienced a water pump failure on a track day. Stock-type aftermarket RB30 pump, total running km about 2000. The bearings collapsed, skewing the rotating bits and the pump seized/spat water out. No issues with overheating prior to it failing, and the water picked up on rear tyres caused an off track excursion so problem identified quickly.

The question for all 30DET builders who use theirs for regular track work is - what spec pump did you use, and have there been any other similar failures?

I'm considering whether the RB30 pump is not suitable, even with a 7200rpm hard cut, and driver-imposed limit of 6500? Other than the price difference, an N1 can go in but if I've just copped a crap pump then will replace it with another stock type.

Link to comment
https://www.sau.com.au/forums/topic/354697-water-pump-options/
Share on other sites

The failed pump sitting in front of me has an 8 bladed impeller.

A GMB branded (Made in Japan - reputedly good quality) pump Part # WP898 from Repco has a 6 bladed impeller but looks otherwise similar. The shape of the backing area is smoother, but not flush-fitting as the N1 design appears to be from pics I have seen.

Less blades should be more efficient at higher pump speeds, and maybe not quite as good at lower speeds, same principle as per turbocharger impellers.

Pics of the N1 looks like it is a better piece of kit altogether but I think its pointless spending the extra if the majority are running stock-type pumps without problems.

So what does a stock RB26 water pump's internals look like?

Edited by Dale FZ1

I think it might depend on what batch of impellers they had available. The one I saw had 6 blades. Genuine pump from Nissan spares had 8, same as the original pump on my RB25, and the failed aftermarket pump. The general finished quality of casting etc on the genuine gear looks higher too; that's what I went with, not going to have another event spoiled if it was a case of inferior quality.

Front of the engine is reassembled, waiting for spare time to install the radiator and add water this week.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • A few small updates since the previous post and lessons. I decided to do a little interior light upgrade on the 110. I quite like the iilumo items, even if they're a bit of a premium over other brands. You'll also note the Stedi Fogs, that will go into the S15 fog lights as I needed to match the bulbs since I got the new ones earlier. I hope they fit as the body is quite a bit longer than your normal bulb.  Annoyingly, I managed to trip the fuse, which normally wouldn't be an issue until I located the fuse. I can't say I've ever come across this. I had lucked out that someone nearby had a spare, but oddly enough Toyota dealerships seem to keep this in stock. I ordered some to keep in my stash and as luck would have it, someone else nearby tripped the same fuse so I passed on the favour.  I also did a little service on the 110 ahead of some additional work coming up. It's been annoying that Goleby's stopped carrying this particular HKS filter for the 110, so now I need to keep them on order from Japan. I also took the opportunity to install a bash plate and number plate riser. The plate riser is such a cheap but nice fix to help really tidy up the car. I'm tempted to now also replace my headlights, on this car. Both items were from Project Aero.    I also needed to replace the rear tyres on the 110, and after trying to get it aligned learnt that I need to replace some bushes in the front end, so that's next.  Closing out this update with a nicer picture as always! 
    • Yeah mate, never miss it.
    • Any going to watch World Time Attack at SMSP this year?
    • Appreciate the correction on the "ground", that will make a huge difference to looking at this. That makes complete sense about AF70/AF71 which is what I had come down to being the issue, one of these. I'll have another look in the ignition wiring when I get a chance next week. I'll also make up a jumper wire for running that AF73 test.  ECU is fine, relay itself is fine, pump harness is fine and the pump itself is fine. I am going to upgrade the Walbro 255 anyway with a DW300 I have since I need to replace the fuel sender and I'm going to upgrade the FPR with my chasebays kit ready for new plenum/injectors/dbw, but I'll get this working first. That's why this is so frustrating. 
×
×
  • Create New...