84_S12 Posted July 14, 2009 Share Posted July 14, 2009 Because an oversize pump will actually recirculate water back on the impeller into the return path so in effect it's doing as fuck all as an undersized pump. Quote Link to comment Share on other sites More sharing options...
Simon Posted July 14, 2009 Share Posted July 14, 2009 I must be missing somthing lol. the whole reason for fitting a bigger than neccesary pump is to increase water velocity to above an optimum rate. there fore lots of energy in(big pump) = lots of enegry out(large water velocity). I agre 40000% on doing shit right, but apart from a small increase in parasitic loss I fail to see how fitting a large water pump is going to hurt this build. and to think, I started this thread with a silly comment made in spam If the pipes wont flow the volume that the pump is trying to push it would be like forcing out a stubborn turd. Quote Link to comment Share on other sites More sharing options...
84_S12 Posted July 14, 2009 Share Posted July 14, 2009 If the pipes wont flow the volume that the pump is trying to push it would be like forcing out a stubborn turd. QFT Quote Link to comment Share on other sites More sharing options...
Brock-Lee Posted July 14, 2009 Share Posted July 14, 2009 lol, all its gonna do is increase the velocity in the pipes. Quote Link to comment Share on other sites More sharing options...
84_S12 Posted July 14, 2009 Share Posted July 14, 2009 Because an oversize pump will actually recirculate water back on the impeller into the return path so in effect it's doing as fuck all as an undersized pump. Quote Link to comment Share on other sites More sharing options...
Brock-Lee Posted July 14, 2009 Share Posted July 14, 2009 do you mind explaining the theory behind that? Quote Link to comment Share on other sites More sharing options...
Simon Posted July 14, 2009 Share Posted July 14, 2009 lol, all its gonna do is increase the velocity in the pipes. do you mind explaining the theory behind that? Next time you piss, clench your ass hole and force it out as hard as you can. Sure it increases the velocity in the pipe. But tell us what happens pressure wise! In other words... Im sure you would rather piss at your own rate (the optimum push to piss flow ratio) rather than water blast the toilet bowl. Quote Link to comment Share on other sites More sharing options...
Brock-Lee Posted July 14, 2009 Share Posted July 14, 2009 yup back pressure will go up. So what. remeber we are talking ~3/4" lines here, not drinking straws. you can flow a huge amount through a 3/4" pipe. Quote Link to comment Share on other sites More sharing options...
84_S12 Posted July 14, 2009 Share Posted July 14, 2009 The analogy is all wrong Stick your cock up your arse, then piss as hard as you can and see how long you want to keep that up for... Quote Link to comment Share on other sites More sharing options...
RUNAMUCK Posted July 14, 2009 Share Posted July 14, 2009 my mate has killed two pumps on his set up. his latest pump was much more expensive. Ideally you'd run a temp sender in the coolant, and use a bit of trial and error to get the ideal flow rate. Quote Link to comment Share on other sites More sharing options...
thegreatestben Posted July 14, 2009 Author Share Posted July 14, 2009 Awesome info here guys. Some mention of adding in things, a temp sender into the system would be a mint idea, there's one in the intercooler but I would probably struggle to find a gauge that matches what it reads. The factory st205 pump goes pretty well: So theoretically if I got my hands on a st205 pump, would an increase in piping length (I think it's about 8m-10m) have a major effect on the pumps efficiency and or workload? And I would actually prefer a large pump operating at low speed, the suby one is annoying loud throughout the car. I believe in a factory setting the pump is controlled depending on speed or temperature or both. However I have it wired up to run at a constant 12v and the celica guys reckon changing to a constant 12v increases the systems ability to cool the system. Quote Link to comment Share on other sites More sharing options...
Brock-Lee Posted July 14, 2009 Share Posted July 14, 2009 all that should do is increase the capacity of water in the system, it will affect the backpressure the pump is pushing against if it has to push more water "uphill" but you should be sweet. jsut put the pump up highish in the system and it wont mattert Quote Link to comment Share on other sites More sharing options...
thegreatestben Posted July 14, 2009 Author Share Posted July 14, 2009 Highish? everywhere else recommends lower in the system. ? Quote Link to comment Share on other sites More sharing options...
Brock-Lee Posted July 14, 2009 Share Posted July 14, 2009 lol I was pretty pissed when that was posted. It should be low in the system because then it will always be well primed. You shouldnt have a problem wioth the increase in line length. it shouldnt effect back pressure enough for you to worry Quote Link to comment Share on other sites More sharing options...
thegreatestben Posted July 15, 2009 Author Share Posted July 15, 2009 have some dimensions of commonly available exchangers: 90ish GT legacy: St205 Celica: Both Quote Link to comment Share on other sites More sharing options...
thegreatestben Posted July 16, 2009 Author Share Posted July 16, 2009 Any motorbike peeps know if these are shit or not? http://www.trademe.co.nz/Browse/Listing ... =230578979 Also what size in/outs? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.