Roush 427R engine issue. Troubleshooting..

[mln385]

450 RWHP equates out to about 520ish Flywheel, as for your problem wht ignition system do you have? Is it mounted in the engine bay or inside the passenger compartment? The underhood temps will effect the system as well as vibration.

If an electronic component is opening up do to heat this would explain why it ran after cooling off at the dealership and fine on the dyno. They dyno'd with hood up and a fan on it right?

[blkasp2]

I know the dealer checked the filters and pump. As far as the ignition system, I am not sure which one it has as the car is still with the dealer. The engine is a brand new 427R. Any idea as to why it would only have 520 HP at the flywheel? Roush sells it as a dyno proven 550hp. After I get this issue resolved, whats the easiest way to pick up some HP? Anything I can do without voiding the warranty??

[mln385]

Originally Posted by blkasp2

I know the dealer checked the filters and pump. As far as the ignition system, I am not sure which one it has as the car is still with the dealer. The engine is a brand new 427R. Any idea as to why it would only have 520 HP at the flywheel? Roush sells it as a dyno proven 550hp. After I get this issue resolved, whats the easiest way to pick up some HP? Anything I can do without voiding the warranty??

It is a sales pitch they phrase it as up to or something like that.

It depends on the Engine I have the 427SR/TW and it dyno'd on the engine stand at 507 hp and 520tq. They sent me the traditional 550hp ID plate. When I inquired why it differed from the dyno sheet I was told the plates are all the same cookie cutter ones. They don't differ, I asked for one with the right numbers and they accomodated me.

A rule of thumb is a manual tranny is 15% drive train loss so if yo have 450RWHP if you had 530 x .85= 450.5

Doubt you can do anything and not jeapordize the warranty, I know some have put different carb on (larger) for more HP or a different intake.

Another way is to inject it.