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I have blown up one gearbox due to lack of oil in it when i had the renault 5 1.4 turbo engine. This however i have had no trouble. But i try to do smooth gear changes plus i am currently only running the valeo clutch which is holding fine for the time being. the 172 box is part of the JC5 gearboxes but it is the strongest one out there, you would need to find a 172 cup car or phase 1 172 as the rest have a speedo pickup from the abs sensor. its the same size as the JB3 gearbox. Wouldn't mind seeing the spec of your car and what psi your running. so i can get an idea when i start turning up the psi in the new year.
Quick update on my car
Having overfueling problems at the moment when changing the map ranges but im sure ill sort that out soon. Decided to change map range from every 500rpm to every 250rpm, however whilst on boost it overfuels even though they are the same figures in both tables which is a bit strange. Got my start a lot better now, seemed that i had a renault 5 battery with a cold crank of 380 trying to start the 1.8 lump, that has now been changed to a battery with a battery with 720 cold crank, starts up a lot better now, just need to sort out the cranking fuel and i believe to be the idle control as well, but still need to play with that
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