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Exhaust side EECU



Looking at a 1999 rd688s with an etech motor turned up to 475 hp at the rear wheels. (Heavy hauler triaxle tractor) and an 18 speed.

It has the exhaust side computer.  Is this vmac III? What concerns should I have about the computer being mounted under the turbo? Truck is in great shape, only 300+k miles. I don't need 475 rwhp, but I sure as hell won't let the dealer touch that eecu if I buy it.

Thanks! Joe

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Make sure the heat shields over the EECU are intact and not missing. Yes, you have a ETECH VMAC 3 .  Being a RD If you have frame mounted fuel filters near the EECU make sure your motor mounts are not bad/damaged. If so , under a hard pull or going off road can allow the engine to lean over and the fuel filter stand can hit the EECU and all it takes is a tiny dent and it’s toast. 

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