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R33 S2 Auto Box Slipping...

OMY31T
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OMY31T Rising Star

OMY31T

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just wondering if anyone has had this issue? its only recent since it was retuned with a new turbo setup and a bit more power.

car is putting out 255rwkw at the momoent on 17psi running a t67. the gear box has a keys valve body and shift kit, and for some reason its started slipping when warm. its got a PWR oil cooler, im going to change the fluid in it this weekend, but im wondering if maybe the torque converter has shit the tin. the gearbox is healthy, changes fine and hard as ever, but not making any power to the wheels, just feels like a slipping clutch, comes on boost and the engine revs but puts through no power to the rear.

good timing in a way as i just got a quote for a 4500rpm stall converter and transbrake from TCE converters in melb, might have to change it earlier than i thought.

so any ideas?? do you guys think the converter is the the issue?

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turboedsloth Grand Master

turboedsloth

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If your gona change the oil, take the oil pan off the bottom off the transmission don't just take the drain plug out. A quick look inside and into the filter will reveal if there is any damage to the unit as there will be friction material present

OMY31T Rising Star

OMY31T

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I had a similar problem, changed over to some really generic Falcadore gearbox oil, Valvoline ATF DX-3 and had a massive improvement which literally eliminated slip. A very cheap and quick thing to try.

as good as that may seem, theres no point as im trying to make more power not cut corners.

when i do the oil, i will change the filter aswell, so ill take a goo look around, but as previously mentioned, the gearbox itself feels ok, so im hoping its the converter. In say that though, i need to make sure its the converter not the box, because if its the box, im going to replace it with a ford C4 gearbox built for the strip which was planned if the rb25 box blew up, i dont want to spend 1.5k on a new stall converter for the 25 box, only to find out the box is rooted and have to get another converter for the C4 lol, big waste of cash.

anyway, ill open it up when i can, and see what i find. other than that, i guess i could always just take it back to knox automatics where it was built and have them check it out and service it.

  • 2 weeks later...
666DAN Grand Master

666DAN

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Posted

as good as that may seem, theres no point as im trying to make more power not cut corners.

when i do the oil, i will change the filter aswell, so ill take a goo look around, but as previously mentioned, the gearbox itself feels ok, so im hoping its the converter. In say that though, i need to make sure its the converter not the box, because if its the box, im going to replace it with a ford C4 gearbox built for the strip which was planned if the rb25 box blew up, i dont want to spend 1.5k on a new stall converter for the 25 box, only to find out the box is rooted and have to get another converter for the C4 lol, big waste of cash.

anyway, ill open it up when i can, and see what i find. other than that, i guess i could always just take it back to knox automatics where it was built and have them check it out and service it.

Changing oil isn't cutting corners, it was more to prove that something simple can often be the fix. Too many people on here look for the most complex reason they have a fault and it normally isn't the case. I'm also a big advocate for not spending a billions dollars on oils, especially with the amount of driving people do on here. Both my R34's I racked up over 100,000kms on them, stuck to $40-$50 oils and never had a single problem with the cars and both were making decent power and were well driven.

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