ep90 gearbox oil in dashpot
Turbo Mini Forums

evening gents.

my turbo runs lean on cruise, sometimes an afr of over 17, where it starts to run roughly, coughing, spluttering etc.

I have been advised to use a thicker oil in the dashpot.

plugs etc are gapped properly. have some thick ep90 gearbox oil in the garage - would this be suitable? hoping to take it for a run tomorrow morning. have also fitted a larger intercooler, and moved the air filter behind the grill over the winter, so It should be running a touch leaner than before.

cheers, dan

have had a bit of a search. seems using this might be advantageous in my case. unless anyone can see any downsides? cheers, dan

The dashpot oil will only help with transient response.
This means that when you floor it you should get a few moments of rich, then it should settle.
If you find when you floor it you get a bit of lean then thicker oil might help.

But I guess it cant really do any damage to run thick oil in there to see if it helps, do you have a windband in the car you can watch while driving?

Assuming you still have the part throttle lean off pipe connected. You can restrict the flow through this to richen it up on cruise. I can't remember if someone has already done this in the past. Robert perhaps?

In the 13's at last!.. Just

tired some 70/90 diff oil and it has sorted all of the fueling problems.

it no longer is a massive pita to pull off from a junction etc. it no longer goes lean for a split second when coming on boost. the afrs are just right at cruise.

its not a joy to drive. off boost it feels like a standard 1275. cheers, dan

tired some 70/90 diff oil and it has sorted all of the fueling problems.

it no longer is a massive pita to pull off from a junction etc. it no longer goes lean for a split second when coming on boost. the afrs are just right at cruise.

its not a joy to drive. off boost it feels like a standard 1275. cheers, dan

*now a joy to drive!