Digital Posted March 22, 2011 Share Posted March 22, 2011 (edited) Hi guys. Just got home from the dyno-facility. We had to quite early because of a strange problem: arround 4000-5000rpm off-boost the oil-temp. rises to about 110-120 degrees and at the same time at these rpm's the oil-pressure rises to about 7 bar. The engine sounds ok, no sounds of bearings or something. The facility has very BIG blowers so that isn't the problem. We had to stop because with the old engine these numbers weren't so high during the mapping.(engine is replaced so the car needs a remap) It is a stock 2JZGTE, 60K mile 2nd-hand engine with HKS 264 cams and a GT37 single-turbo setup. We use Defi's gauges. Anybody have an idea what could be wrong, or had this problem before? Edited March 22, 2011 by Digital (see edit history) Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted March 22, 2011 Share Posted March 22, 2011 Could be any number of things, is it just the engine thats changed? or turbo as well? if its not mapped for the higher lift/duration cams, this could be a contributing factor, cold be causing higher combustion temps/EGTs, it could be that the engine is simply not been run in properly, and is still a bit tight (long shot but possible) Is the cooling fan clutch working properly? despite the large dyno fan it could have an influence if not working correctly, have you changed the front bumper for a different design? Quote Link to comment Share on other sites More sharing options...
Digital Posted March 22, 2011 Author Share Posted March 22, 2011 It is the same GT37-setup as before, only the longblock changed from UK-spec to J-spec with HKS 264-cams. We looked, and the water-temp. stays about 100degrees where the oiltemp. goes above 120. The car has an alu rad. with electric fans which operate through the OEM sensor/connector at the bottom of the rad.(same as the small fan on a OEM rad.) The car has a Do-Luck front-bumper which is ducted for the FMIC. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 22, 2011 Share Posted March 22, 2011 I would suspect the gauges or their electrickery. can't beat Bourdon tube analogue ones Quote Link to comment Share on other sites More sharing options...
Digital Posted March 22, 2011 Author Share Posted March 22, 2011 Are you serious Chris? Could Defi's be "off" through wiring or something? I know there is more stuff(boostcontroller, AFR-gauge) connected to the same 12V+ and GROUND as the Defi's gauges.. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 23, 2011 Share Posted March 23, 2011 Yes, I'd put a mechanical pressure gauge on it and see if it does the same thing. Quote Link to comment Share on other sites More sharing options...
dude Posted March 24, 2011 Share Posted March 24, 2011 Are the senders for pressure and temp in the same place as before ????? Quote Link to comment Share on other sites More sharing options...
Digital Posted March 24, 2011 Author Share Posted March 24, 2011 Yes indeed. Quote Link to comment Share on other sites More sharing options...
Digital Posted September 15, 2011 Author Share Posted September 15, 2011 Kicking this up! I've changed the engine for a stock low-milage VVTi longblock. Still the same problem! (100+degrees oiltemp. and high oilpressure when hot) I tried different 100% checked goodworking Defi sensors en gauges, tried a different place for the wiring of the Defi-control-unit. Still the same problem. I've also taken a closer look at the oilpressure-gauge: when reving the engine to some higher rpm's the oilpressure goes to about 9+bar! What should be the oilpressure in "bar" with a normal stock longblock when warm/hot?(90-110 degrees) It's a real contradiction because you should say "higher oiltemp. - lower the oilpressure" Watertemp. is quite high when hot, about 100-110 degrees(still stock thermostat en stock sensor in the rad.), this could explain the high oiltemp. But it still does not explain the high oilpressure. Quite a mess....anyone? Quote Link to comment Share on other sites More sharing options...
Samurai 20V Posted September 15, 2011 Share Posted September 15, 2011 Were are you taking the readings from? I have a sandwich plate with Defi gauges, I run oil temps of between 100 to 110degs... The pressure gauge reads about 0.7 bar over from the stock readings ( idle should be 0.5bar at normal temps according to the service manual). I am gonna relocate the pressure sensor using the Lexus bolt mod for better readings... Quote Link to comment Share on other sites More sharing options...
Digital Posted September 15, 2011 Author Share Posted September 15, 2011 I also use a sandwich-plate. @Samurai: I think you mean 5,0bar and 7,0bar? The 100-110 degrees oiltemp on your engine, is this when cruising or on heavy load? My 100-110degrees is when cruising on low revs.. My oilpressure when hot: at idle: about 2,5-3,0bar cruising: about 5,0bar reving: 8-9bar and up! Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 15, 2011 Share Posted September 15, 2011 Have you tried proper gauges? Have you checked voltages to the gauges? I would fit a proper mechanical temp and oil pressure gauge set up. Water temp even on a serious 600 plus BHP engine on a dyno shouldn't exceed 95 degrees C. I think the clue to the problem is in your log in name...... Quote Link to comment Share on other sites More sharing options...
Samurai 20V Posted September 15, 2011 Share Posted September 15, 2011 I also use a sandwich-plate. @Samurai: I think you mean 5,0bar and 7,0bar? The 100-110 degrees oiltemp on your engine, is this when cruising or on heavy load? My 100-110degrees is when cruising on low revs.. My oilpressure when hot: at idle: about 2,5-3,0bar cruising: about 5,0bar reving: 8-9bar and up! No mate, I mean 0.5 bar at idle. The readings I am getting at idle is 1.2bar (0.7bar over), but the sandwich plate is a higher pressure area.. Cruising temp is closer to 100, traffic condition I saw 112deg, but Japan is very hot at the moment..Hard driving it is around the 110deg mark.. Your pressure seems high, as Chris suggested I think try another sender unit or gauge.. Quote Link to comment Share on other sites More sharing options...
Digital Posted September 15, 2011 Author Share Posted September 15, 2011 @Chris: well the thing is, with the old engine and with the same gauges I had totally different readings. I only swapped the longblock you see? I put in another, but new sandwich-plate in though, but a sandwich-plate is nothing more than a piece of aluminium right? @Samurai: strange about your oilpressure readings, they should be in whole numbers because the Defi's read in whole numbers from 0 to 10,0bar. Quote Link to comment Share on other sites More sharing options...
Samurai 20V Posted September 15, 2011 Share Posted September 15, 2011 @Chris: well the thing is, with the old engine and with the same gauges I had totally different readings. I only swapped the longblock you see? I put in another, but new sandwich-plate in though, but a sandwich-plate is nothing more than a piece of aluminium right? @Samurai: strange about your oilpressure readings, they should be in whole numbers because the Defi's read in whole numbers from 0 to 10,0bar. There are decimals inbetween the whole numbers...I am reading those.. The gauge reads in KPA, 1 bar = 100Kpa.. At idle, mine reads around 1.2bar or 120KPa... Quote Link to comment Share on other sites More sharing options...
Digital Posted September 15, 2011 Author Share Posted September 15, 2011 @Samurai: mine reads from 0 to 10,0bar. Didn't know Defi's had gauges in KPA. Quote Link to comment Share on other sites More sharing options...
Samurai 20V Posted September 15, 2011 Share Posted September 15, 2011 @Samurai: mine reads from 0 to 10,0bar. Didn't know Defi's had gauges in KPA. Maybe different series, I have the BF Link Series.. Quote Link to comment Share on other sites More sharing options...
Hellstrom Posted September 15, 2011 Share Posted September 15, 2011 Hmm do you think that your oilpressure is according to the gauge? iam thinking either its a fault gauge, lots of old burnt oil somewhere blocking the oilcanals, pistonrings are done combined with a not verry good crank ventilation. The oiltemp would also come with the increase in pressure since the oil won't circulate fast enough making it travel slower and soaking more heat from turbo etc. just my thoughts. Quote Link to comment Share on other sites More sharing options...
Digital Posted September 16, 2011 Author Share Posted September 16, 2011 Well like I said, I tried different Defi gauges and sensors, also new ones! And I tried to change the power-feed for the Defi Link unit also. Quote Link to comment Share on other sites More sharing options...
Samurai 20V Posted September 16, 2011 Share Posted September 16, 2011 Well like I said, I tried different Defi gauges and sensors, also new ones! And I tried to change the power-feed for the Defi Link unit also. Change the location of the pressure switch and then check.. Quote Link to comment Share on other sites More sharing options...
Digital Posted September 16, 2011 Author Share Posted September 16, 2011 Will do! It's a VVTi so I'll change the OEM oilpressure-sensor for the Defi. Quote Link to comment Share on other sites More sharing options...
Samurai 20V Posted September 16, 2011 Share Posted September 16, 2011 Will do! It's a VVTi so I'll change the OEM oilpressure-sensor for the Defi. Just check that the threads are the same.. Quote Link to comment Share on other sites More sharing options...
Tyson Posted September 16, 2011 Share Posted September 16, 2011 Some very experienced members on here have told you to use mechanical gauges to get a definitive answer, you could save yourself a lot of hassle and just do what they said. Quote Link to comment Share on other sites More sharing options...
Digital Posted September 16, 2011 Author Share Posted September 16, 2011 Sure, and I respect their opinion and possible solutions very much! BUT, the SAME Defi gauges and sensors we're mounted with the old engine and I didn't had any problems then. You could say the problem could only be in the turbo-oilfeed/return lines, or the new sandwich-plate, these parts are the only parts which are outside of the replaced engine.. Quote Link to comment Share on other sites More sharing options...
Digital Posted September 28, 2011 Author Share Posted September 28, 2011 (edited) Kicking this up again! I took the orders from the experienced here. First I switched the Defi oliepressure-sensor in the sandwichplate for a analog gauge, and what do you think? Still over 9,0bar oilpressure at high rpm's! WTF so to speak.. Next plan was to remove the sandwich-plate alltogether and place the analog gauge instead of the OEM oilpressure-sensor. Look what I found when I looked at the oilfilter.. To make a long story short, the engine is a VVTi from a Aristo, and the seller of the engine was also the mechanic who replaced the oil-pan for a Supra oil-pan.. What you see on the pic are pieces of sealant(right word?) from the oilpan.. Now I placed a new oilfilter, removed the sandwichplate and have a analog gauge instead of the OEM sensor and these are the readings: Idle: 2-2,5bar High RPM: MAX 7bar (where earlier it really was 9-10bar!!) Still a little confused about the high idle readings though... Some experienced and also the manual say 0,5bar at idle, but to be honest I have seen about 3-4 different stock longblocks with 2-3bar oilpressure at idle.. Edited September 28, 2011 by Digital (see edit history) Quote Link to comment Share on other sites More sharing options...
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