Not very happy right now.

[xrocket21]

Ok, so the truck was designed to run on 87, just not optimally.

Why anyone would pay $80k for a high performance truck just to have it run poorly and unreliably is beyond me.

it just doesnt make sense

 

[Jayrod]

it just doesnt make sense

Why would anyone listen to Ford and run the fuel they say it was designed to take? I can put a bottle of rubbing alcohol in my 87 tank for .40 cents and it do almost the same thing lol.

 

[xrocket21]

Why would anyone listen to Ford and run the fuel they say it was designed to take? I can put a bottle of rubbing alcohol in my 87 tank for .40 cents and it do almost the same thing lol.

Anyone with even the slightest knowledge of forced induction knows that octane is important.

87 is fine if you arent running hard.

OP stated that he was running low octane fuel, and is having issues under hard acceleration. Common answer is run higher octane fuel to solve the problem, but you seem to be stuck on the fact that you can run lower octane fuel.

 

[smurfslayer]

Ok, so the truck was designed to run on 87, just not optimally.

Why anyone would pay $80k for a high performance truck just to have it run poorly and unreliably is beyond me.

Other than subjective “my truck runs better on nn octane gas” can you point to a first person, verified account of octane being the cause of poor running in the 2017 Rap or contributing to an actual problem needing repair?

It’s not a baiting question, Rap is the first vehicle I’ve seen an actual r requirement to run semi-synthetic or full synthetic oil - no dino oil meets the manual requirements. So, if there is a case of the 3.5tt being initially designed to run on 93, and then having the knock sensors dialing back power you would have a point. If however they set it up to run on 87 - which isn’t the cheapest, lowest available octane in all areas of the USA, there’s 85 & 86 available in a lot of other regions of the USA, if they set it up to run on 87, and everything is working as designed then you’ll gain practically nothing by way of power from running higher octane without a retune You’ll get more resistance to detonation, which is definitely a plus for using the truck as designed, off roading, high altitude, hot weather, a combination or towing, etc.

 

[John813]

I know it's for a different engine/and knock sensors(?)/technology but 91 was the minimum for the GT500's, Lightnings, Terminator etc...
Top dog vehicle with boost needed 91+ to not run like shit/detonate.

This truck is a 3.5L TT High output engine. It's performance based/tuned. To me, it's a no brainer/cheap insurance to run the 91/93.

 

[Jayrod]

Anyone with even the slightest knowledge of forced induction knows that octane is important.

87 is fine if you arent running hard.

OP stated that he was running low octane fuel, and is having issues under hard acceleration. Common answer is run higher octane fuel to solve the problem, but you seem to be stuck on the fact that you can run lower octane fuel.

I get what you are saying and the gent below answered what I was going to bring up. Did Ford design every facet of this motor to run on 87, knock sensors, timing etc? Or did they make it for 91+? Think of this from a legal standpoint, how on earth could Ford make a vehicle not run correctly on the gas they say it's build around? That's asking for a lawsuit or paying out for motors. That's all I'm saying, I've had a ton of FI vehicles and obviously with the tune required to run them I had to use 91+. But that goes back to my point, what is this truck made to support?

 

[xrocket21]

Other than subjective “my truck runs better on nn octane gas” can you point to a first person, verified account of octane being the cause of poor running in the 2017 Rap or contributing to an actual problem needing repair?

It’s not a baiting question, Rap is the first vehicle I’ve seen an actual r requirement to run semi-synthetic or full synthetic oil - no dino oil meets the manual requirements. So, if there is a case of the 3.5tt being initially designed to run on 93, and then having the knock sensors dialing back power you would have a point. If however they set it up to run on 87 - which isn’t the cheapest, lowest available octane in all areas of the USA, there’s 85 & 86 available in a lot of other regions of the USA, if they set it up to run on 87, and everything is working as designed then you’ll gain practically nothing by way of power from running higher octane without a retune You’ll get more resistance to detonation, which is definitely a plus for using the truck as designed, off roading, high altitude, hot weather, a combination or towing, etc.

I have firsthand experience that I tried to run 87 in my 2011 ecoboost. I got mild hesitations, and some knock. I stepped on it on the highway once in the rain and got the horrible shudder/power loss.

The final straw was when my wife was driving, I was sleeping, and she accelerated onto the highway and got the shudder so bad it went into limp mode. From that point on, we never ran anything less than 91, and never had another problem.

If you are taking it easy, you can run 87 all day long. If you run hard or accelerate hard at all, you run the risk of knocking.

It went against my better judgement to run 87, but I gave it a try in the name of fuel cost savings.

It is a fairly high performance engine, with forced induction.

it is good practice to run high octane fuel in fairly high performance forced induction engines.


---------- Post added at 04:21 PM ---------- Previous post was at 04:18 PM ----------

I get what you are saying and the gent below answered what I was going to bring up. Did Ford design every facet of this motor to run on 87, knock sensors, timing etc? Or did they make it for 91+? Think of this from a legal standpoint, how on earth could Ford make a vehicle not run correctly on the gas they say it's build around? That's asking for a lawsuit or paying out for motors. That's all I'm saying, I've had a ton of FI vehicles and obviously with the tune required to run them I had to use 91+. But that goes back to my point, what is this truck made to support?

your average mall crawler wont push it hard enough to have an issue.

Many buyers will not ever have a problem.

This is an enthusiast site, and enthusiasts might be harder on their vehicles.

The truck SHOULD pull timing or whatever it has to do to run properly on 87, if it is designed for it.

In my personal experience, it doesnt work so well.

Run 87 all day long, go fight it in court if it pops you want. OR, run high octane fuel in a high output twin turbo motor.

Seems like a no-brainer.

 

[smurfslayer]

I have firsthand experience that I tried to run 87 in my 2011 ecoboost. I got mild hesitations, and some knock. I stepped on it on the highway once in the rain and got the horrible shudder/power loss.

The final straw was when my wife was driving, I was sleeping, and she accelerated onto the highway and got the shudder so bad it went into limp mode. From that point on, we never ran anything less than 91, and never had another problem.

If you are taking it easy, you can run 87 all day long. If you run hard or accelerate hard at all, you run the risk of knocking.

It went against my better judgement to run 87, but I gave it a try in the name of fuel cost savings.

It is a fairly high performance engine, with forced induction.

it is good practice to run high octane fuel in fairly high performance forced induction engines.


...merciful snippage.

so you have first hand experience running 87 octane gas in a previous generation 3.5. Did you have it analyzed by a dealer and was it diagnosed? The symptoms can be a number of things, and bad knock sensors are among them. I don’t even think we’ve put the same Rap on the same dyno to establish if the truck runs any differently on 87-89-91-93 octane. I know there were previous power plants that did produce more power on higher octane fuel, but that is an unknown as of yet on this truck.

re-stating my question:

Other than subjective “my truck runs better on nn octane gas” can you point to a first person, verified account of octane being the cause of poor running in the 2017 Rap or contributing to an actual problem needing repair?

Not to pick nits here, but I’ll paraphrase what I heard from Raptor Assault from one of the staff ‘there’s a whole lot of misinformation being spread about the [2017 Raptor] online’

 

[Dartv8r]

so you have first hand experience running 87 octane gas in a previous generation 3.5. Did you have it analyzed by a dealer and was it diagnosed? The symptoms can be a number of things, and bad knock sensors are among them. I don’t even think we’ve put the same Rap on the same dyno to establish if the truck runs any differently on 87-89-91-93 octane. I know there were previous power plants that did produce more power on higher octane fuel, but that is an unknown as of yet on this truck.

re-stating my question:


Not to pick nits here, but I’ll paraphrase what I heard from Raptor Assault from one of the staff ‘there’s a whole lot of misinformation being spread about the [2017 Raptor] online’

This is a no brainer. Any forced induction performance motor will produce more power the higher the octane rating is. This is why you see 1000hp GTRs getting only 8xx on regular pump gas vs 110 octane race gas. You don't need to dyno this to prove it. Higher octane= more advanced timing= more power

 

[xrocket21]

This is a no brainer. Any forced induction performance motor will produce more power the higher the octane rating is. This is why you see 1000hp GTRs getting only 8xx on regular pump gas vs 110 octane race gas. You don't need to dyno this to prove it. Higher octane= more advanced timing= more power

Were wasting our breath here man. What are simple concepts in the automotive world, regardless of vehicle, dont apply to the almighty raptor according to some people here.