Guys
What is the maximum RPM or Red Line figures for a stock 2010 6.4 PSD F 350? I have read the manual several times and it states not to go over the red line, but no figures are given, such as 4000 rpm's etc. I have had mine over 3500 rpm's during normal driving on the freeways etc, but there is NO indication on the tach for Red Line limits etc. Sorry for the dumb question.
Tia,
Don

 

The PCM won't let you go over the redline. It will turn the fuel off if the engine speed gets too close to the red line. And no, I don't know what RPM that is.

 

Small thread hijack: my Dad has an '07 Dodge with a 6.7 and it has a feature on the trans that won't allow downshifts that would over-rev the engine (can't go into 1st @ 65mph, for example). But his last Dodge, an '01 with the 5.9 and it no such thing on it as I found out. I drove it once when it was nearly new and accidently pushed the "O/D OFF" button at 65mph and the trucks low gears nearly stuffed me into the steering wheel as it rapidly slowed with the engine screaming. I dind't do that again...

 

I agree with Mark. From what I have read is the PCM will govern top speed and will defuel. So I would assume that would be the case if you tried to max out the RPM's as well.

 

I found this information...

2010 FORD F250 F 250 Truck 6.4 Liter POWER STROKE Diesel Supplement Owners Manual - Download Documents / eBooks-

To determine if a coolant additive recharge is required, check the nitrite strength of the coolant using the coolant nitrate test strip kit (Acustrip 3-way Antifreeze Test Strip). If the nitrite strength is above 800 ppm no action is required. If the nitrite strength is between 800 ppm to 300 ppm add 32 fl. oz. (946 ml) of engine coolant additive, Motorcraft VC-8 or equivalent. If the nitrite strength is below 300 ppm, flush & refill the cooling system. Fuel and turbocharger cooling system (F-Super Duty only) The fuel and turbocharger cooling system contains a cooler which is mounted on the turbo interstage U-tube on the left side of the engine. The cooler's function is to regulate engine fuel temperature and cool the electronics that support the turbocharger. You may hear the auxiliary coolant pump running up to 10 minutes after the ignition is turned off in hot weather or if you are towing heavy loads. This is to control the temperature of the turbocharger. Engine governed speed The engine governor is controlled by the PCM. The PCM controls fuel input to limit maximum engine speed. It will not, however, prevent engine overspeeding resulting from downshifting at high vehicle speed or by descending steep grades at too high a vehicle speed for the selected transmission gear. If your vehicle is equipped with a manual transmission, refer to Manual transmission shift speeds in the Driving chapter of your Owner's Guide for maximum vehicle shift speeds in various gears. Do not exceed 4,000 rpm. Maximum engine governed speed is 3,700 rpm. Excessive rpm can only be achieved by manually downshifting at too high of a vehicle speed. Operating the engine beyond the governed speed can cause severe engine damage. Speed control (F-Super Duty) If vehicle speed goes outside a predetermined range from the set speed, the RES (Resume) function will not reset vehicle speed. Vehicle speed will need to be reset with the SET +/- button after reaching desired speed using accelerator pedal.

 

With a manual trans it is possible to overspeed the engine with a dumb downshift. The automatic won't let you do this. If you move the shifter to a gear that would overspeed the engine it won't downshift to that gear.

 

Would anybody know if I would need an auxilliary cooler like a Tru-Cool 40K to be able to pull a trailer with a 26k to 30K GVW. I have a later model 99 F550, 7.3l, 4x2 w/4.88 rears & a ZF6 manual tranny. Currently in the process of upgrading. The truck is rated to pull a maximum trailer GVW of 33K. Currently there are lines going to the bottom of the rad. for tranny cooling, is this enough cooling capacity when pulling that kind of load? If I install the Tru-Cool 40K cooler with a thermostatic bypass valve, will the tranny pump be able to circulate the proper flow through this system & keep the temps under control? What is an acceptable tranny oil temp for a manual ZF6 tranny? My concern is when crossing over the hills in western CO with outside temps in the 90-100 range that my oil temp will be over 200+ degrees.

 

Thanks Guys for the info.

I was given a RPM gage, it has a manual red line setting for any RPM you want, and the read range is set at 100 rpm's per line (more accurate) than the OEM Rpm gage.

Can this new gage be install/used without deactivating the OEM gage? Would this be adviseable?

Tia,
Don

 

how does this new guage connect? If it is thru the OBI port then you could run both.

 

Hi Scott

This RPM gage has colored 4 wires for attachment.
Don