abr33

That seems a little low, what head gasket, comp ratio pistons and ring gaps??

Not really an option... I honestly think it needs a cushion drive or damper on the tube. Like the stocker that works...

So I had the shaft rebalanced again. This time far more accurately than before. Been running stock shaft, no issues at all. Put on new big one again, same vibration! Anyone got further ideas before I loose the plot??

Any news on this??

I have a big radiator, sits on 75 ish on highway, and 80-85 on the track or heavy traffic. Yours sounds spot on. Also thermostats and guages can easy vary a few degrees

Im not 100% sure but doesnt the dyno computer usually save every run's afr's, boost, revs, power etc? They should be able to show you??

Were they checked for clearance or blueprinted?

Yeah iv only had mine since the start of this thread. could of been old stock... I recon the anodising makes the belt intermittantly slip and grab and create a flicking of the belt. Might be wrong. whereas the blasted pulley is very grippy and consistent

More elaboration, I can confirm that on the track I failed to spit the powersteering belt again. Mine is rb25, limiter 7700, to recap on the mods I did to help, I machined front lip of p/s section down to 1mm over belt height, and beadblasted all the anodising off the belt grooves, and refitted using a new gates racing belt. Time will tell if its a confirmed win

Yeah the sump to cam cover vent was intended to reduce the work for oil drains.. I will probably now feed it to catch can

Hard to say, there is oil in the lines to the can but obviously theres going to be a mist of oil at best coming through so I cant say for sure if thats where my quantity is from, Id say its not the biggest issue as iv been on an airstrip and done countless 0-240/250 km/h runs on high boost and there wasnt any pumping out, just an oily residue left on vent filter

Thanks for the help, Ill get onto it when I get a chance. I will put bigger breathers on can and remove foam and put drains into a better spot

Thanks for that Mark Oil is pumping out the breather on the catch can, the breather size is fairly small I guess..

The current catch can, which will be now modified Even though I run atmo vented, the intake sucks all the smoke in so its not being polluting

I understand what your saying, and I know without testing oil will come out... And thanks for the offer but Im 3.5 hours out of sydney lol. Ill invest in a 1 way valve

This might be my issue then, I might tee into vct drain and/or turbo drain. I will put a second can on drivers side where my sump breather taken from front rhs top of sump and run it as independent to the top of the engine and can is approx 2L

Cornering seems to be the offender, the faster i got throughout the day, the less I revved it (because of oil), the more turning force..

The cans vented to amto, and its got foam cut to fit perfectly in it. But I understand passenger is low pressure side?? what If I plumb to turbo dump?

Rb25, ill see if i have a pic i dont think so but 4 thou i think bore clearance, If blowby was the big issue, why would it slowly get worse, shouldnt it be a spewing mess first lap? Returns to sump about 25mm down from block on passenger side front of sump. Any thoughts on using the fueltank foam in can? might be holding it? or hard in corners blowing it back up to can?

Hi guys/girls, I did a track day at eastern creek and I discovered an issue with oil, and infact, a shitload of it. First run out, drove hard whole time, no worries (that i noticed) just a bit of oil marks near breather. Second one out, bit of oil coming out breather. By the end of third, when I stopped oil was running everywhere and dripping on floor, and did all day then on. I know what your thinking, oil control not sorted or busted rings etc. Tested compression, with throttle shut and all plugs in but the one in test, crank for 6-8 seconds, I got 132-139 psi range. Considered the gaps set to 23 ish thou as reccomended, and my gapping varying a thou or so, thats pretty good I think with heat soaked engine, no oil used in test, head and block are full height, std comp pistons, std gasket etc. and 5k on engine this sounds ok? Was running low boost (15psi/260kw) My oil control is all done by me, includes oversize baffled and gated sump (7.5L), improved pickup, tomei pump set at 65 psi, redline 15w/50 oil, enlarged oil drains, all other drains drilled to 9mm, external head drain, front sump top to cam cover 1 inch breather, catch can returning to sump , semi baffled covers, pcv block, 1 ish mm head restrictors. Oil was only getting to 95 degrees max on track, and towards the end I wasnt flogging it at all, not even full boost except main straight, So im after ideas of why im getting so much progressively blowing out, is it that I run catch can full of tank foam and it holds the oil in the foam assisting it out? Is it oil pumping up catch return? is it that I overfill sump by 10mm? Im guessing over 2 hours i lost 2 cups of oil... maybe 1.. This never happens when I do 0-200 km/h runs. I think I might set up sump vent rather than setting it back to cam covers... Not sure what details im missing so ask what else is needed. After and ideas/feedback or what Iv done wrong in my setup

after my track day I can say I didnt spit the belt with the mods explained on the last page

I put factory rear half on, the vibration is almost gone. I think I can still feel the slightest bit still but not sure. Definately a balance issue with the shaft.

After checking everything yet again, all angles are perfect, and the vibration is worse at diff end. I was told not a good idea to undo centre loint and fit factory rear half as its not balanced together, but they should both be balanced anyway so ill have to try it. Anyone got any further experience/input?

I only have rear half lol. Factory front in transit

But the factory rear is rubber driven