Hey I got a few simple questions about my new edge evo that I got a few days ago.
1. I got 33 X 12.50 on 17" rims so what mm would that be? IDK how to get that.
2. On level 3, would it be ok to run 93 octane instead of 91 octane. I cant find a gas station around that has 91.
3. I've read around where most 150s have 3:55 gear ratio instead of 3:75, which is what the evo has set. Would my 05 have 3:55 or where can I look to find out?
4. Can I hurt my engine by running around 5300 rpm? Ive read something like that in here too, but when I run it WOT its going to go around 5300 rpm. That didnt make a lot of sense to me.
I know these may seem like common sense questions to yall probably, but I sure would appreciate if you would rep;y back with the answers.
Thanks alot
#1. there is an equation where you can enter in your tire info and solve the equation to get your tire circumference in millimeters. i think this is it>
[(width x ratio x 0.002) + (rim x 25.4)] x 3.1416 x 0.97 = tire circumference
#2. from what i have learned, if you dont run the required octane which the program level requires, you can retard the timing.
#4. i have got my gryphon yesterday and tried it out on canned, 87-tow. and i have experienced the same issue you have with the WOT shifting around 5300 rpm. therefore i tried making minor adjustments and it didnt correct it and i put it back to stock. i figure i wait a couple of weeks for my custom tunes rather then screwing up my powertrain cuz thats what it felt like it was doing. now when i nailed it from a dead start, it would rev all the way up to 5200-5300 rpms, the truck would jerk/buck for bout a second or two, then shift. now that didnt feel normal to me at all. thats when i tried to mess with the WOT adjustment and didnt feel a diff. i didnt go to far into it. thats when it went back to stock, lol..but under normal driving conditions, it did feel ok.
and im sorry i couldnt help you out with #3. i dont even know the gear ratio in my truck. if somebody could help us both out, i'd appreciate it. i got a 5.4, 2008 limited, awd, supercrew.
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Last edited by AntzFreshWhip; 11-03-2009 at 10:27 PM.
Alright thanks that answers some of my questions. But where you said that I could retard the timing, is that a very serious problem, or would it be ok to just run 93?
i dont know 100% but i have read bout this in another thread. i did read that if you use 87 instead of 91, it would damage your engine. somebody should eventually answer you with an answer.
Alright. yea I read about it in another threat also, which is what made me think of this. But anywa, yea somebody will have an answer. Thanks for all your help I appreciate.
To run a higher octane than the tune calls for you need to bump the timing UP, not retard it. You need to add +1.0 for 93. On the gears, check the tag on your door where it says axel. get the 2 digit code and go to our How To section. There is a thread on how to decode your VIN. go down the list till you see gears ratios and compare what your code is. Enter that in the Edge. I would set the 1 and 2 shifts at 5150 and the third shift at 4800. Also, the max rpms need to be 400 over your highest shift, so if you go with 5150, you would set it at 5550.
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Jim
Flowmaster 40, K&N dropin, Tint, Roush wheels, 305/50/20s
Edge Evo with PHP custom tunes, GF 2" shackles
I'm pretty sure the Evolution manual lists the circumference in millimeters for 33 inch tires. It doesn't matter how wide or what the wheel size is. Take that number, multiply it by 0.97, and enter the result as the tire size. I think Bluejay answered your other three questions.
[quote=Bluejay;3950055]To run a higher octane than the tune calls for you need to bump the timing UP, not retard it. You need to add +1.0 for 93. On the gears, check the tag on your door where it says axel. get the 2 digit code and go to our How To section. There is a thread on how to decode your VIN. go down the list till you see gears ratios and compare what your code is. Enter that in the Edge. I would set the 1 and 2 shifts at 5150 and the third shift at 4800. Also, the max rpms need to be 400 over your highest shift, so if you go with 5150, you would set it at 5550.[/Q
i could be wrong, but imo, isnt 5150 kinda high for a shift outa 1st and 2nd gear? when i punch it from a dead start and once i get up there in 1st,idk wat the hek the truck is gonna do..lol...it doesnt feell like a normal shift. thats y i put the truck back to stock for now-had no time to mess with it.
Last edited by AntzFreshWhip; 11-04-2009 at 11:46 AM.
Each truck is a little different. Some have set their shifts as high as 5400. There would be nothing wrong with a 5000 shift. You have diminishing returns over about 5100 anyhow. Just don't ever go over 4800 for the 3-4 shift. That is a weak point and by then you should be letting off anyway.
I think the highest I set mine was 5250. I seldom went WOT anyway and I have no idea where it's set now, in the custom tune. I don't stay in it all the way. I don't race it. I just want the power there when I need to go.
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Jim
Flowmaster 40, K&N dropin, Tint, Roush wheels, 305/50/20s
Edge Evo with PHP custom tunes, GF 2" shackles
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