2017 87 vs 93 hp difference?
09-05-2017, 02:09 PM
#3
Senior Member
Difference, if any, would be very small from the slight timing change. The compression ratio of the engine cannot be changed to take advantage of the 93 octane throughout the engine speed range.
09-05-2017, 02:12 PM
#4
Senior Member
MPT showed a chart of a 17 3.5 on the dyno with 87 hitting the knock sensors hard
MPT......
Testing a 2017 3.5 Ecoboost truck with 87 octane in it.
This is on the stock tune, off the street, very first hit. These values show how many degrees of spark advance is being pulled out by the knock sensors to keep the engine safe.
This is pegging the range of the knock sensor from the factory.
Last edited by untraceable; 09-05-2017 at 02:14 PM.
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WVMoose (12-31-2019)
09-05-2017, 02:18 PM
#5
Senile member
the PCM can run a bit more timing under 93 and it makes more power across the powerband.
IF we could run e85, tuning for that just in ignition timing alone would see pretty substantial gains, add in additional boost.......
Last edited by chimmike; 09-05-2017 at 02:22 PM.
09-05-2017, 02:22 PM
#6
Don't waste your money on premium unless you're tuning and trying to shave that 1/10th off of your track run. Regular runs just fine and there's no difference with normal driving or even light towing. Travel trailer is 5000 lbs, boat is 7500 lbs. Never noticed a difference in mileage or power when towing either with premium. I also never get any knocking with regular either... PERHAPS it might make a difference if you're towing your max weight, up a very very steep hill and need to accelerate uphill for some reason. That's what I would consider "heavy duty towing".
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09-05-2017, 02:47 PM
#8
Senior Member
I'll caution you on this it's also about OAT. Outside air temp.
on of the issues with boost is you heat up and hopefully cool the air before going in the burn hole.
If your OAT is say 70 - then 87 gas might run well in the engine without pulling too much timing or adding extra fuel (another ECU protection measure is to run richer to cool down the cylinders)
If your OAT is say 90 - running anything but 93 will cause severe power loss. Now I say maybe because it's different for every engine and for whatever power band.
I know for me most of my engines like 93 octane when the temps outside creep up to 90. This includes my 3.5L Ti-VCT mill in the exploder, and the 2.7L ecoboost in the truck.
I don't know how the truck will respond this winter but if it's like my other engines it'll like 87 just fine. But OAT has a big effect on how it wants to perform.
on of the issues with boost is you heat up and hopefully cool the air before going in the burn hole.
If your OAT is say 70 - then 87 gas might run well in the engine without pulling too much timing or adding extra fuel (another ECU protection measure is to run richer to cool down the cylinders)
If your OAT is say 90 - running anything but 93 will cause severe power loss. Now I say maybe because it's different for every engine and for whatever power band.
I know for me most of my engines like 93 octane when the temps outside creep up to 90. This includes my 3.5L Ti-VCT mill in the exploder, and the 2.7L ecoboost in the truck.
I don't know how the truck will respond this winter but if it's like my other engines it'll like 87 just fine. But OAT has a big effect on how it wants to perform.
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06-10-2019, 01:29 AM
#9
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Have you tried 93 octane??
I have in my 2016 2.7. It made a huge difference!!!
06-10-2019, 01:37 AM
#10
I'll caution you on this it's also about OAT. Outside air temp.
on of the issues with boost is you heat up and hopefully cool the air before going in the burn hole.
If your OAT is say 70 - then 87 gas might run well in the engine without pulling too much timing or adding extra fuel (another ECU protection measure is to run richer to cool down the cylinders)
If your OAT is say 90 - running anything but 93 will cause severe power loss. Now I say maybe because it's different for every engine and for whatever power band.
I know for me most of my engines like 93 octane when the temps outside creep up to 90. This includes my 3.5L Ti-VCT mill in the exploder, and the 2.7L ecoboost in the truck.
I don't know how the truck will respond this winter but if it's like my other engines it'll like 87 just fine. But OAT has a big effect on how it wants to perform.
on of the issues with boost is you heat up and hopefully cool the air before going in the burn hole.
If your OAT is say 70 - then 87 gas might run well in the engine without pulling too much timing or adding extra fuel (another ECU protection measure is to run richer to cool down the cylinders)
If your OAT is say 90 - running anything but 93 will cause severe power loss. Now I say maybe because it's different for every engine and for whatever power band.
I know for me most of my engines like 93 octane when the temps outside creep up to 90. This includes my 3.5L Ti-VCT mill in the exploder, and the 2.7L ecoboost in the truck.
I don't know how the truck will respond this winter but if it's like my other engines it'll like 87 just fine. But OAT has a big effect on how it wants to perform.