PhilMorrison Posted November 17, 2009 Share Posted November 17, 2009 I've got a bit of deja vous here as I'm sure I've already asked this, but the search says no I'm not interested in the usual discussions on pro's and cons of underdrive, or aftermarket. I would just like to know if any of the companies out there make a damped underdrive crank pulley for the 2J? as my search results here and general google come up with nothing. Thanks Phil Quote Link to comment Share on other sites More sharing options...
Terminator Posted December 15, 2009 Share Posted December 15, 2009 Try contacting ATI in the USA, they make a vast range. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted December 15, 2009 Share Posted December 15, 2009 Can't you make the accessory pulleys bigger, instead? Quote Link to comment Share on other sites More sharing options...
PhilMorrison Posted December 16, 2009 Author Share Posted December 16, 2009 Try contacting ATI in the USA, they make a vast range. I have and they weren't very helpful. They definitely don't do an underdrive damped pulley. Can't you make the accessory pulleys bigger, instead? No, there's no room unfortunately. The powersteering pump has no clearance at all, and this is the part we really need to underdrive as we've blown approx 10 pump seals. I'm sorted now anyway thanks guys. I asked on an Australian forum, and they pointed me at a product called Ross Tuffbond. I am having two damped underdrive pulleys manufactured as we speak . Quote Link to comment Share on other sites More sharing options...
Terminator Posted December 21, 2009 Share Posted December 21, 2009 The powersteering pump has no clearance at all, and this is the part we really need to underdrive as we've blown approx 10 pump seals. That is a lot of pump seals, are you sure that the pump/ PS system is OK, I run 8750 rpm using all stock size pulleys. Apart from a collapsed PS hose I have had no problems. Quote Link to comment Share on other sites More sharing options...
PhilMorrison Posted December 21, 2009 Author Share Posted December 21, 2009 It's because when you are on full steering lock at 100mph and 8000 RPM it seems some heavy curb clipping can add just enough back pressure on the rack to make the front seal on the pump very unhappy. It is very much a revs related problem though, as on my car that only revs to 7600 it doesn't happen so often, and when we used to run one of the cheapo undamped underdrive pulleys on the car that usually pops them all of the time, it didn't have a problem even at 8000rpm. We just don't want to use the cheapo pulley any more as it may have contributed to the early demise of one of our engines. Is that a 2JZ you're running at that RPM? that's impressive. Quote Link to comment Share on other sites More sharing options...
Terminator Posted December 21, 2009 Share Posted December 21, 2009 It's because when you are on full steering lock at 100mph and 8000 RPM it seems some heavy curb clipping can add just enough back pressure on the rack to make the front seal on the pump very unhappy. I guessed you might be on full lock at high rpm, after I posted. So realised rpm is far more of an issue for you. Lets hope the AUS guys can sort out your problem. Is that a 2JZ you're running at that RPM? that's impressive. Yes with my VWR built motor, it will take 9000rpm, but I decide to set the limit a little lower. It is very addictive up that end of the rev range, I have to use those rpm every time I take it out. Quote Link to comment Share on other sites More sharing options...
bondango Posted December 21, 2009 Share Posted December 21, 2009 Phil as your tight for space have you considered a remote pump? im thinking of giving the Mr2 turbo pump a go Quote Link to comment Share on other sites More sharing options...
Thorin Posted December 21, 2009 Share Posted December 21, 2009 ...or just ditching the power steering. Quote Link to comment Share on other sites More sharing options...
PhilMorrison Posted December 21, 2009 Author Share Posted December 21, 2009 Phil as your tight for space have you considered a remote pump? im thinking of giving the Mr2 turbo pump a go It has crossed my mind, but I'm not sure it could withstand the pressures that drifting puts on the steering system. It's quite a lot of work to test and have it fail. ...or just ditching the power steering. Definitely not an option. The force need to pull a car off full lock when you have the amount of steering we do is ridiculous, and can actually be pretty dangerous when the steering gets stuck . Quote Link to comment Share on other sites More sharing options...
Thorin Posted December 21, 2009 Share Posted December 21, 2009 Are you running a power steering cooler? Quote Link to comment Share on other sites More sharing options...
PhilMorrison Posted December 21, 2009 Author Share Posted December 21, 2009 Yeah you can't run a decent drift car without one. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted December 21, 2009 Share Posted December 21, 2009 I doubt it's excessive pump RPM causing those seal failures, have you stripped the rack, or tried another one? Hoses ok internally? Fittings and cooler big enough, flow wise? Quote Link to comment Share on other sites More sharing options...
PhilMorrison Posted December 21, 2009 Author Share Posted December 21, 2009 The fittings are Aeroquip, they are big enough and flow and cooling is good. We've had a few different racks as well. It's not just on one car, but on the main culprit we blew seals for a year, then fitted an underdrive pulley and didn't blow any for 6 months, then blew the engine and went back to a normal damped pulley and we started blowing seals again. We're not just replacing seals by the way, we are replacing pumps. I'm open to the idea of it being some other part of the system causing the failure, but with having no failures when using an underdrive pulley before, and a fast approaching new season. that's enough for me to purchase two damped underdrive pulleys at great cost Quote Link to comment Share on other sites More sharing options...
David P Posted December 21, 2009 Share Posted December 21, 2009 Have you tried using fully synthetic trans fluid? Quote Link to comment Share on other sites More sharing options...
bondango Posted December 21, 2009 Share Posted December 21, 2009 Phil we had a similar problem on a 2J, though it turned out to be the additional pump support arm that had been fitted. The pump drifted very slightly out of skew but not enough to cause belt damage. Seemed extra strain on the Vane shaft and bearing assembly at high rpm caused no.2 seal to start weep Quote Link to comment Share on other sites More sharing options...
PhilMorrison Posted December 21, 2009 Author Share Posted December 21, 2009 Interesting thanks bondango . Although the culprit car has had multiple engines and ancillaries, always with the stock set up I will look into that. Ironically the car that has extra bracing on the pump, and actually has the alternator hanging off the same bracket as well doesn't blow seals. Quote Link to comment Share on other sites More sharing options...
Terminator Posted December 21, 2009 Share Posted December 21, 2009 As the problem seems to happen at extremes would it not be cheaper to put a pressure release valve in the system and dump fluid back to the reservoir? Quote Link to comment Share on other sites More sharing options...
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