OPG Needed on 2020 Models

[engineermike]

I bet less than 10 people could accurately answer that question and they all work for Ford or a contractor under NDA. I’ve done torsional critical speed analysis before and it required a background in engineering, some years of experience, a week of specialized training, plus a special program to perform it....on machines 1/20th as complicated as a coyote.

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[gt350_driver]

I found this for using 5W50.
https://www.nmradigital.com/nmra-and-ford-performance-announcement-about-gen-ii-coyote-stock-engine/
I am running on Red Line 5W30 on my wife's 2017 GT PP1, but in next days we will do a few changes; GT350 manifold with throttle body and JLT CAI with 1 7/8 catted long tubes. I think we should use 5W50 or even 5W40.

 

[GregO]

I found this for using 5W50.

(Quote)
“We know some racers run much lighter weight oils and reduce the oil level to gain an edge in performance."

This has been done for decades by competitive wet sump drag racers. This article is about NMRA creating a level playing field. Did they mention anything about oil level and viscosity enforcement at events ?

 

[engineermike]

Fwiw, I use pennzoil platinum euro 5w-40.

 

[Fast351]

Yeah I read that. Pretty sure voodoo's use the same OE gear, every supercharged roush car uses the same OE gears, Manuel Gomez runs 7's on a factory sealed 1039 whp coyote zero issues. Alejandro Flores beats on his shit on OE gears as long as with every other LUND R&D vehicle. So there's that.

To be fair Alex mentioned that he removed the rev limiter altogether, therefore he would never experience bouncing off the hard limiter. As he so eloquently put "don't shift like an asshole".

 

[WildHorse]

Nope.

Then you not going to get your answer, other as I pointed out above, 0-10000 rpm and it's living. IF you wanna go by FORD, and the team that developed the coyote, 8500 rpm. Harmonics, critical speed, whatever you wanna call it isn't a issue.

critical speed:
NOUN
(Mechanical engineering: Mechanics and dynamics)
The critical speed of a body is the speed, usually the speed at which it is rotating, at which it starts to vibrate.
Excessive levels of vibration while passing through a critical speed can lead to severe damage to equipment.
When the airflow over the tip of the blade reaches its critical speed, drag and torque resistance increase rapidly and shock waves form creating a sharp increase in noise.
The critical speed of a body is the speed, usually the speed at which it is rotating, at which it starts to vibrate.

Harmonics/critical speed isn't an issue for the OE OPG, cause it's rotating on a fixed point. The only issues I see is user error/improper harmonic balancer installation. Bouncing off the limiter puts stress of the chain, which is transferred down to the crank. Improper balance installation IE: hammering on the balancer, having it sit cocked, along with the pulley etc., etc. can result in catastrophic results.

 

[Semp1]

Where?

My dealership along with others on this forum. And I understand all the online mechanics debate it and the car will do well with 5w30 too. But personally I feel Ford has no reason to recommend it at dealerships. Personally I think it’s the way they deal with the gen3 tick.

 

[engineermike]

Ford uses a soft and hard rev limiters in the coyote. You can play with all this stuff in hptuners but this thread has put a couple of thoughts in my head. For one, since my personal goal is max power on 93, extending the rpm will get me more power without more cylinder pressure. I’m thinking about moving my shift points up since the failure rate with the stock balancer is obviously very low. I think I can also move the fuel-cut rev limiter that shocks everything up over 8000 rpm and use a throttle-cut rev limiter just above the shift point. Something like shift at 7800, throttle cut at 8000, and fuel cut at 8200. Just thinking out loud....

 

[GregO]

Then you not going to get your answer

It's all good WildHorse.
The Smart guys know exactly what RPM's to stay away from.
The Crafty engine dyno operaters say "Die and Learn"

 

[EFI]

My dealership along with others on this forum.

One dealership service advisor and a bunch of randoms on the internet =/= Ford.

 

[Semp1]

One dealership service advisor and a bunch of randoms on the internet =/= Ford.

You know what. You’re right All American is lying. It’s every service advisor at that dealership btw. You know better. Call your dealership and ask if Ford is recommending 5W50 now on 18+ GTs. I’ll bet they say yes.

 

[engineermike]

. Call your dealership and ask if Ford is recommending 5W50 now on 18+ GTs. I’ll bet they say yes.

I’m not calling to find out so I will stop short of calling BS but I would be shocked if this was official guidance from Ford. I think they’d be in trouble with the EPA also, because the certification was on 5w20.

 

[shogun32]

I think they’d be in trouble with the EPA also, because the certification was on 5w20.

do let us know when the EPA reviews your car's mileage data and sends you a bill for being a bad boy. ford picked the lowest weight oil they could get away with (and readily available) to get tiny fractions of a percent better mpg on the testing rig so they could rig their corporate numbers.

5x20 won't blow up your engine. Neither will 5w30 or 10w40 nor 10w50.

 

[engineermike]

do let us know when the EPA reviews your car's mileage data and sends you a bill for being a bad boy. ..

There is a huge difference between consumers choosing to not follow the manufacturer’s recommendation, and the manufacturer changing their recommendation. Ford very specifically says that if you do change to even 5w30 for track use then you must change back before driving on public roads. This is all in writing, because if the verbiage allows any street use of higher viscosity oil then the epa mileage numbers aren’t honest. Other oems are doing this as well. This is a documented legal issue with the epa. This is also why I asked to see something in writing from Ford saying to use 5w50 in the gen3. I would be extremely surprised if something turned up, for reasons mentioned above.

 

[shogun32]

This is also why I asked to see something in writing from Ford saying to use 5w50 in the gen3.

the GT350 manual says to and also for I4, but the GT one says 5w30.

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