Spoony Posted January 3, 2008 Share Posted January 3, 2008 hi my greddy t78 doesnt make any rotation in lower rpm´s. when i push the gas a little bit, its starts, but not when its under 900rpm. i know its a big turbo and it doesnt have bb, maybe a problem with my oil pipes, or is it normal?? Link to comment Share on other sites More sharing options...
Mike B Posted January 3, 2008 Share Posted January 3, 2008 I have been in one t78, it had nothing until 4k at which point the gates of hell opened. My opinion was that it was undrivable until you get it on boost, they was no gradual feed in and no power at all when under 3k. It was the only one i have been in though. the new bb singles seem to have very gradual and low end spool by comparison. Link to comment Share on other sites More sharing options...
mikeyb10supra Posted January 3, 2008 Share Posted January 3, 2008 its a big old turbine to start to rotate fairly normal I would say Link to comment Share on other sites More sharing options...
lockys96 Posted January 3, 2008 Share Posted January 3, 2008 i have the bigger t88 on a mr2. i put my foot down, nothing. can hear spool 3k Link to comment Share on other sites More sharing options...
Spoony Posted January 3, 2008 Author Share Posted January 3, 2008 could i replace the turbo with another one without changing the downpipe? for example if i would go for a gt40 dbb, would the downpipe still fit??? i would prefer to sell the car instead of removing or installing this downpipe again!!!!! which turbos do fit without welding or changing the downpipe?? its a t4 flage and a 4 bolt exhaust side Link to comment Share on other sites More sharing options...
lockys96 Posted January 3, 2008 Share Posted January 3, 2008 to modify a downpipe isnt as much work as you would think Link to comment Share on other sites More sharing options...
Alex Posted January 3, 2008 Share Posted January 3, 2008 It may produce no power till 4,000 but it still spins... It takes a fair amount of exhaust gas energy to get the turbo spinning, the bigger it is the more it takes. I would imagine the behavior of your turbo is normal. Link to comment Share on other sites More sharing options...
Spoony Posted January 3, 2008 Author Share Posted January 3, 2008 to modify a downpipe isnt as much work as you would think i can modify the downpipe very easy, its the removing and installing that im afraid of its much easier with a german car, but my jspec has the damn steering wheel on the wrong side. i had to remove a lot of parts until it was possible to get the downpipe and wastegate in the car Link to comment Share on other sites More sharing options...
Spoony Posted January 5, 2008 Author Share Posted January 5, 2008 i made a small video http://www.myvideo.de/watch/3088359 in he 2nd part yu can see how the turbo runs is this normal`? Link to comment Share on other sites More sharing options...
JamieP Posted January 5, 2008 Share Posted January 5, 2008 i made a small video http://www.myvideo.de/watch/3088359 in he 2nd part yu can see how the turbo runs is this normal`? Thats normal id say, thats how my old T88 was. Link to comment Share on other sites More sharing options...
JamieP Posted January 5, 2008 Share Posted January 5, 2008 could i replace the turbo with another one without changing the downpipe? for example if i would go for a gt40 dbb, would the downpipe still fit??? i would prefer to sell the car instead of removing or installing this downpipe again!!!!! which turbos do fit without welding or changing the downpipe?? its a t4 flage and a 4 bolt exhaust side You would have to mod the downpipe as the T78 is 4 bolt fitment and the Gt40 is Vband also it would not meet up. You would have to lift the turbo with a 10mm spacer aswell to stop it resting on the manifold and modify the intercooler pipework possibly, no big deal for any decent tuner. Link to comment Share on other sites More sharing options...
Spoony Posted January 5, 2008 Author Share Posted January 5, 2008 i think i will go for a kkk turbo next year. a friend of mine knows the sales man from kkk. he made a real low price for building a custom turbo. they have some really good and new products, not so known like the garret turbos, but they can repair it really quick and cheap in germany Link to comment Share on other sites More sharing options...
Tones Posted January 5, 2008 Share Posted January 5, 2008 Blitz do them no?? Or what am i thinking of Link to comment Share on other sites More sharing options...
Mike B Posted January 5, 2008 Share Posted January 5, 2008 Just looked at that vid and there is no residual spin there at all.. it looks stiff! I have a ball bearing turbo, and mine can spin for up to a minute after I have turned the car after idle.... is this normal for a journal bearing? Link to comment Share on other sites More sharing options...
Homer Posted January 5, 2008 Share Posted January 5, 2008 I don't think thats right, surely the turbine should spin while exhaust gasses are passing over it? On my T67dbb it would spin even while cranking the engine from cold. Link to comment Share on other sites More sharing options...
TurboBrett Posted January 5, 2008 Share Posted January 5, 2008 it should still spin though? the T3 in my mini was wizzing its arse off at idle and that was/ is a big turbo for a 1293cc is your waste gate closing fully? i could manualy open mine and that stoped it prety good;) and like mike said the minis turbo would still be whining for 30-odd seconds after a good hard boot and shutdown, yours stops very quick maybe you could idle it untill warm and feel the oil return pipe from the tubbie if its warm its getting oil;) Link to comment Share on other sites More sharing options...
SUPRASUZUKI Posted January 5, 2008 Share Posted January 5, 2008 I'd agree with the previous two posts. The turbo seems to stop quite abruptly, rather than free-wheeling. I'd check the shaft for excessive play and check for smoothness of rotation. Link to comment Share on other sites More sharing options...
ajazyasin Posted January 5, 2008 Share Posted January 5, 2008 from other vids ive seen, its quite normal for a big turbo to stop spinning on idle Link to comment Share on other sites More sharing options...
Spoony Posted January 5, 2008 Author Share Posted January 5, 2008 you cant compare this old turbo with a dbb turbo Link to comment Share on other sites More sharing options...
Spoony Posted January 5, 2008 Author Share Posted January 5, 2008 i talked with a garage that repairs trucks. the t78 is orginally from a mitsubishi truck they said big turbos without bb´s do not turn in idle, its normal!! Link to comment Share on other sites More sharing options...
Homer Posted January 5, 2008 Share Posted January 5, 2008 I don't have any 1st hand experience with the older large turbo's, but every other I've seen (inc T67 & T71 journals) spin easily on idle. As you say the T78 and T88's are very old truck turbo's, but so are many of the turbo's used on 2JZ's With the engine off, if you flick the compressor does it need any force to spin? Any sign of shaft play? Might be worth splitting the cartridge from the exhaust housing to see if the turbine is still intack... Link to comment Share on other sites More sharing options...
Spoony Posted January 5, 2008 Author Share Posted January 5, 2008 no, you dont need any force to spin, its normal like every other turbo i had before. i had a kkk16, kkk26 and kkk29 on my calibra. but i never looked at them if they spin in idle or not. the shaft play is really small Link to comment Share on other sites More sharing options...
Homer Posted January 5, 2008 Share Posted January 5, 2008 If there is minimal shaft play and no sign of oil buring take a look at the turbine, the oil supply and drain don't need to be removed for a quick inspection. If it's intact then you can say it's all okay Link to comment Share on other sites More sharing options...
SUPRASUZUKI Posted January 5, 2008 Share Posted January 5, 2008 If it moves freely, with little shaft play and doesn't feel 'notchy' when you rotate it, then it sounds ok to me. Link to comment Share on other sites More sharing options...
Spoony Posted January 5, 2008 Author Share Posted January 5, 2008 If there is minimal shaft play and no sign of oil buring take a look at the turbine, the oil supply and drain don't need to be removed for a quick inspection. If it's intact then you can say it's all okay i think thats the best idea to make it sure. will do it tomorrow thanks guys!!! Link to comment Share on other sites More sharing options...
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