Roush 427 IR

[twobjshelbys]

Originally Posted by jeffgrice

Mike,I know you asked about temps and that was answered. A key in buying a ROUSH FI motor is to know the specific EFI system used. Roush switched many times. There was a period years back when they used a locked system and only roush could maintain. I suggest to check that our and be sure you have access to an FI mechanic famaliar with the specific system. JEff

I think you're referring to the initial period when they used the Accel DFI system. It wasn't really "closed". You could buy the PC USB dongle and software from Jegs and completely open it up (I did) and found that their tune was incomplete. It cost me several grand to get it finished. Most people never noticed because most never ran it into the segments where altitude compensation (which was "null") mattered.

Shortly after that they went to the FAST system and I don't know what they use today.

My bottom line is that I don't think the extra cost of a Roush over any number of equivalently built solutions is warranted. The primary reason is that their support isn't all that great to make up for the extra cost. In all fairness my car came with the Roush 427IR installed so I didn't have a say. It took over a year to understand what the issues were and get them resolved. I was minutes away from simply returning the car to Roush and having them swap the DFI for carbs when the tuner in Ft. Collins had me hook up the tuning hardware/software, read some logs, looked at the tune and explained what was going on. It was disappointing that Roush didn't even understand their own system well enough to fix it.

[jeffgrice]

Originally Posted by twobjshelbys

I think you're referring to the initial period when they used the Accel DFI system. It wasn't really "closed". You could buy the PC USB dongle and software from Jegs and completely open it up (I did) and found that their tune was incomplete. It cost me several grand to get it finished. Most people never noticed because most never ran it into the segments where altitude compensation (which was "null") mattered.

Shortly after that they went to the FAST system and I don't know what they use today.

My bottom line is that I don't think the extra cost of a Roush over any number of equivalently built solutions is warranted. The primary reason is that their support isn't all that great to make up for the extra cost. In all fairness my car came with the Roush 427IR installed so I didn't have a say. It took over a year to understand what the issues were and get them resolved. I was minutes away from simply returning the car to Roush and having them swap the DFI for carbs when the tuner in Ft. Collins had me hook up the tuning hardware/software, read some logs, looked at the tune and explained what was going on. It was disappointing that Roush didn't even understand their own system well enough to fix it.

This was not the initial period. It was the 2nd or 3rd switch. There were upwards of 100 IR motors with the system. And I can confirm that is was locked. I will try to find reference to the brand.

Thanks

Jeff