This is topic What octane gas to use 87 89 91? in forum Tech Talk at Northern California Ford Owners .
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Posted by 209 FIVE.O (Member # 9959) on
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My set up is
306 block, E cam, E7 heads ported, polished & decked, 1.94 & 1.6 valves, 30 lbs injectors, 70 mm TB, Eddie performer w/ 1" spacer, mac cai w/ fender well air filter, mac equal lenght headders, bassany x pipe 2 cats and my timing is @about 12* 5 spd.
What gas should I be running for max performance?
Thanx ca fords
Posted by RAP66 (Member # 3360) on
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I would use 87 because it's cheaper and see how your motor runs. I'm running 10:1 + supercharged, so in my case I need to use 91 or better.
What's your compression?
Posted by 89 306 (Member # 9042) on
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I would go with 89
Posted by Greasy (Member # 5258) on
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87
Posted by sydewayzLX50 (Member # 10217) on
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I use 91 whether stock or modded
Posted by 79 cobra (Member # 10137) on
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quote:
Originally posted by sydewayzLX50:
I use 91 whether stock or modded
+1 no matter what i always use 91
Posted by NEIGHT (Member # 8741) on
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quote:
Originally posted by 79 cobra:
quote:
Originally posted by sydewayzLX50:
I use 91 whether stock or modded
+1 no matter what i always use 91
+2 I run 91 in mine
Posted by fredfifty (Member # 10320) on
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i used to put 89 in my 89, but now i put 91 in my 91
[ January 11, 2012, 07:35 AM: Message edited by: fredfifty ]
Posted by 94dropteezyGT (Member # 2385) on
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quote:
Originally posted by NEIGHT:
quote:
Originally posted by 79 cobra:
quote:
Originally posted by sydewayzLX50:
I use 91 whether stock or modded
+1 no matter what i always use 91
+2 I run 91 in mine
+3 only the best for mines
Posted by MauriSSio (Member # 9943) on
:
quote:
Originally posted by 209 FIVE.O:
My set up is
306 block, E cam, E7 heads ported, polished & decked, 1.94 & 1.6 valves, 30 lbs injectors, 70 mm TB, Eddie performer w/ 1" spacer, mac cai w/ fender well air filter, mac equal lenght headders, bassany x pipe 2 cats and my timing is @about 12* 5 spd.
What gas should I be running for max performance?
Thanx ca fords
it wouldnt hurt to use 91* i guess but it might not do anything for it.
Posted by cali95gt (Member # 8940) on
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Is the few extra cents really going to hurt you. even if you fill up, the price difference is very little...
Posted by 209 FIVE.O (Member # 9959) on
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Thanx to all the responses I do have a tendency to use 91 in all my cars but just recently a friend told not to. This car I hardly drive so money wise is not gona break me. Just wondering what you guys tought and trying to get the best performance out my 306. Thanx again
Posted by Phil G 59 (Member # 10028) on
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If you drive like my 82 year old mother use 87. If you drive like Kyle Bush use 91 :-)
Posted by 209 FIVE.O (Member # 9959) on
:
quote:
Originally posted by RAP66:
I would use 87 because it's cheaper and see how your motor runs. I'm running 10:1 + supercharged, so in my case I need to use 91 or better.
What's your compression?
10:1 as well
Posted by SLOWFOX (Member # 11067) on
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91 plus an lucas octane booster every 3 fill ups n u will feel the diffrence...
Posted by Blind (Member # 3052) on
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with that combo, if it doesn't ping at WOT with 87, run 87.
with the bumped timing you may need 89, but there's no reason to run 91 on a bolt-on 5.0
Posted by 209 FIVE.O (Member # 9959) on
:
quote:
Originally posted by Phil G 59:
If you drive like my 82 year old mother use 87. If you drive like Kyle Bush use 91 :-)
ha ha ha I dont know about Kyle Bush but more like Ricky Bobbit "if im not first im last" lol
shake & bake
Posted by MauriSSio (Member # 9943) on
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quote:
Originally posted by Blind:
with that combo, if it doesn't ping at WOT with 87, run 87.
with the bumped timing you may need 89, but there's no reason to run 91 on a bolt-on 5.0
this is the correct answer but who wants to listen for pinging and go through that whole "did you hear pinging? i coulda swore i heard pinging....it was pinging right?" debacle. but youre right in that if it doesnt need it, it wont help it. DCR plays a role in all this as well.
Posted by triple b (Member # 8763) on
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LOL my timing is 14 degrees if you run 18 you will need 91 octane even bolt-ons pings suks you will know if your car is pinging
Posted by MauriSSio (Member # 9943) on
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quote:
Originally posted by triple b:
LOL my timing is 14 degrees if you run 18 you will need 91 octane even bolt-ons pings suks you will know if your car is pinging
From what I've read, not all knock is easily perceptible or audible. And damage can happen even then
Posted by just_another_ 91 (Member # 9317) on
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belive it or not i ran my fastest time with 87 octane with 18 degrees of timing with ported e7 head tfs1 cam and trickflow intake with mac headers and mac off road x pipe with flows
Posted by 209 FIVE.O (Member # 9959) on
:
quote:
Originally posted by just_another_ 91:
belive it or not i ran my fastest time with 87 octane with 18 degrees of timing with ported e7 head tfs1 cam and trickflow intake with mac headers and mac off road x pipe with flows
Nice!!!!
Posted by triple b (Member # 8763) on
:
quote:
Originally posted by MauriSSio:
quote:
Originally posted by triple b:
LOL my timing is 14 degrees if you run 18 you will need 91 octane even bolt-ons pings suks you will know if your car is pinging
From what I've read, not all knock is easily perceptible or audible. And damage can happen even then
Yeah but the guy is worried about spending a 1 or 2 dollars more to fill up if your that worried about "unperceptible" knock go have it tuned but then there is cost involved...just run 91 if the engine is stock its not going to blow and who cares not like there is $ in that engine.. but to go back to "max performance" in the original post you need to have it tuned per dyno and adjust the timing and fuel pressure, if you don't have a adjustable fuel pressure regulator your not going to get max performance out of your combo....you can also take it to the track run 91 and slowly adjust the fuel pressure and timing till you get your best 1/4 time...BAM you got max performance "test and tune" day every sat @ sac raceway
[ January 12, 2012, 08:29 AM: Message edited by: triple b ]
Posted by MauriSSio (Member # 9943) on
:
quote:
Originally posted by triple b:
quote:
Originally posted by MauriSSio:
quote:
Originally posted by triple b:
LOL my timing is 14 degrees if you run 18 you will need 91 octane even bolt-ons pings suks you will know if your car is pinging
From what I've read, not all knock is easily perceptible or audible. And damage can happen even then
Yeah but the guy is worried about spending a 1 or 2 dollars more to fill up if your that worried about "unperceptible" knock go have it tuned but then there is cost involved...just run 91 if the engine is stock its not going to blow and who cares not like there is $ in that engine.. but to go back to "max performance" in the original post you need to have it tuned per dyno and adjust the timing and fuel pressure, if you don't have a adjustable fuel pressure regulator your not going to get max performance out of your combo....you can also take it to the track run 91 and slowly adjust the fuel pressure and timing till you get your best 1/4 time...BAM you got max performance "test and tune" day every sat @ sac raceway
ive been saying it probably doesnt REALLY need 91 but might be wise to just run it. Its only a couple bucks more per fillup, no sense in being THAT stingy with money.
Posted by 209 FIVE.O (Member # 9959) on
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quote:
Originally posted by triple b:
quote:
Originally posted by MauriSSio:
quote:
Originally posted by triple b:
LOL my timing is 14 degrees if you run 18 you will need 91 octane even bolt-ons pings suks you will know if your car is pinging
From what I've read, not all knock is easily perceptible or audible. And damage can happen even then
Yeah but the guy is worried about spending a 1 or 2 dollars more to fill up if your that worried about "unperceptible" knock go have it tuned but then there is cost involved...just run 91 if the engine is stock its not going to blow and who cares not like there is $ in that engine.. but to go back to "max performance" in the original post you need to have it tuned per dyno and adjust the timing and fuel pressure, if you don't have a adjustable fuel pressure regulator your not going to get max performance out of your combo....you can also take it to the track run 91 and slowly adjust the fuel pressure and timing till you get your best 1/4 time...BAM you got max performance "test and tune" day every sat @ sac raceway
Im not worried at all bout money since I hardly drive it. But when I drive it I drive it like I stoled it lol. Whats the point den let her have every now n den. I do have a fuel press reg set @ 39-40 psi. Yes I no wit a good tune it will be better. I dont really no anyone here in modesto that does that. So I think im gona run 91 chevron ( just for the hell of it) I do have the msd set up so it should all get burn reall good even 91 octane rite?
Posted by 209 FIVE.O (Member # 9959) on
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With this set up
30 lbs injectors
70 mm tb
Mac cai
Eddie performer w/ 1" spacer
Ngk v plugs
Full msd set up dizzy coil n 6al box
Mac headders equal length
What wd be the best fuel press?
Posted by CagedBlueGT (Member # 9804) on
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quote:
Originally posted by sydewayzLX50:
I use 91 whether stock or modded
+1
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