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Go Back   REVscene Automotive Forum > Technical Discussion > Advanced Forced Induction & N/A Engine Tuning

Advanced Forced Induction & N/A Engine Tuning This forum is brought to you by Racing Greed in Port Coquitlam.
Supercharger vs Turbocharger vs NA? Hondata vs Megasquirt? 94oct vs 87oct? Through technical discussion, let's find out what will the best option for you...

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Old 10-16-2010, 08:44 AM   #26
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Quote:
Originally Posted by Lomac View Post
Stock, as in completely bone stock? Nothing done to it? Provided it's of North American descent, it doesn't require 94 octane and you'll be fine with a lesser grade.
it's not bone stock, just has a catback system, air filter, and fmic for engine mods =P

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Originally Posted by pintoBC_5sfte View Post
is chevron the only one with 94 there now? in kelowna i think that its the only one left with 94... haha they better not get rid of it or im hooped
yeah chevron is basically the only one that has 94 now
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Old 10-16-2010, 04:06 PM   #27
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I have an Cobb AccessPort and usually run the 93 octane maps, but always switch to 91 when heading on a road trip. If you can't load a new tune on the fly, then I'd stick with a 91 tune since it's easier to find gas, especially if you're traveling outside the GVRD.
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Old 10-22-2010, 12:30 PM   #28
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Can you not save both maps on a laptop so when you want to switch it up you can?
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Old 10-22-2010, 12:33 PM   #29
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You can but you have to have a program like an ostrich for Honda's that allows you to change the tune without having to actually burn it to a chip. Also that means you have to carry your laptop with you at all times just in case.

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Old 10-26-2010, 02:31 AM   #30
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I have an Cobb AccessPort and usually run the 93 octane maps, but always switch to 91 when heading on a road trip. If you can't load a new tune on the fly, then I'd stick with a 91 tune since it's easier to find gas, especially if you're traveling outside the GVRD.
Thats the proper way to do it. I'm doing this with Vipec later this next year.
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Old 11-21-2010, 10:32 PM   #31
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Originally Posted by tofu1413 View Post
i was wondering about this question for myself...

so i guess i need a tune for 94?

83mm bore, 11.5:1 CP forged pistons, stock ITR cams (this is on my 2000 ITR ) im running just a apexi VAFC right now..
You have a get a good tuned 91 map and see how much detonation is there compared to 94. Stock ITR might not make 'that' much of a difference IMO if you switch over ot 94. lol

Switch over to S300 or AEM if you decide to 'make' more power.
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Old 11-21-2010, 10:36 PM   #32
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^ found a dude thats willing to check out whats going on by spring.

doesnt matter right now anyways, as the car is sitting inside the whole winter so far.
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Old 11-22-2010, 03:59 PM   #33
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I sort of regret tuning my RSX to 94.... its a bitch to always find a Cheveron... and when you go on a road trip, Cheveron isn't always closest....
I had this problem when I drove to Calgary for the summer.... I was forced to fill with Cheveron and shell (they don't have Cheveron in Alberta) and then my entire time in Calgary I was running 91 or 93 from Huskey and the car knocked and ran like shit.....


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Old 11-22-2010, 05:10 PM   #34
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Retune it back to 91.
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Old 11-22-2010, 09:32 PM   #35
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Well there are many ways to go abouts octane gas. lol You can try 91 octane tuned with Water Methanol Injector on NA application. There you can sort of fill up 91 octane, but you'll have the trouble of filling up the methanol ever so much.
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Old 11-28-2010, 11:58 AM   #36
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For those of you who tune to 94, why not just keep a couple bottles of octane booster in your truck for the odd time that you can't get to a Chevron.
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Old 12-01-2010, 05:30 AM   #37
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For those of you who tune to 94, why not just keep a couple bottles of octane booster in your truck for the odd time that you can't get to a Chevron.
Because you would need a hell of a lot of bottles of booster to raise it up to 94oct. If a bottle claims to raise octane by 5 points, it's actually 0.5 octane points (so 87 becomes 87.5oct).
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Old 12-06-2010, 10:50 AM   #38
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damn! for real? thats pretty useless considering i thought the 5 points actually well...bring it +5

87 octane + 5 = 92

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Old 12-06-2010, 11:18 AM   #39
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Old 12-06-2010, 11:46 AM   #40
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My bro has a RSX-S k proed and was tuned with 94 first. When Petro Can stopped selling 94, he got a few tanks of 91 and retuned. He only lost 1 whp and a little torque, so I would say keep it at 91. I drove my turbo ls to Calgary, and almost ran out of gas on the way back because half the gas stations off the highway only sold regular... plus the car ran like shit because i was forced to fill up with 91 while in Calgary.

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Old 04-20-2011, 08:30 PM   #41
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+1

Best torque generally occurs when peak cylinder pressures are reached roughly 15 degrees after top dead center. As long as you can advance your timing enough to have peak cylinder pressures at the right time you are good. Turbo set ups, especially high boost applications are nearly always knock limited due to extremely high cylinder pressures. This is why you see large hp gains from W/M injection and high octane fuels because they allow timing to be advanced to the point where peak cylinder pressur occurs at the right moment (roughly 15deg atdc instead of for example 25deg atdc knock limited). If you are not having detonation/knock before your torque curve peaks, then 94 isn't needed.

I'm not trying to repeat Captain Bondo, just reinforce.

Cheers.

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What it actually depends on is whether or not you are knock limited currently with 91. Many small-bore normally aspirated engines with pent-roof combustion chambers are not knock limited on 91.

In other words, ignition can be advanced to the point that makes best torque, and further advance results in power actually dropping off. If you can hit that point currently then you will not gain anything.

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Old 09-13-2012, 11:32 PM   #42
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Hey, bumping an old thread, but I recently got a 2010 TSX V6, I was told to fill with premium unleaded fuel, the first week I got my car I went to the states and I filled up with their best fuel which is 92 octane, this week my gf borrowed the car and wanted to be nice and filled up with 89 octane thinking that's what it takes when I had 1/4 a tank of 92 octane from the states. So from my understanding the premium unleaded fuel is the 91 octane, is there anything I should be worrying about? and should I be using the 94 octane at chevrons or is the 91 octane fine?
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Old 09-13-2012, 11:35 PM   #43
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Hey, bumping an old thread, but I recently got a 2010 TSX V6, I was told to fill with premium unleaded fuel, the first week I got my car I went to the states and I filled up with their best fuel which is 92 octane, this week my gf borrowed the car and wanted to be nice and filled up with 89 octane thinking that's what it takes when I had 1/4 a tank of 92 octane from the states. So from my understanding the premium unleaded fuel is the 91 octane, is there anything I should be worrying about? and should I be using the 94 octane at chevrons or is the 91 octane fine?
91 Octane should me sufficient for your TSX.
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Old 09-14-2012, 12:29 AM   #44
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The internets if FILLED with "can my acura take 87/89"...and the answer is usually yes, but why.

Half a tank of the 89 won't matter. And like ^ said, 91 is plenty good.
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Old 09-14-2012, 01:07 AM   #45
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no stock car sold in north america requires 94 octane
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Old 09-14-2012, 01:12 AM   #46
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no stock car sold in north america requires 94 octane
Yea, I just want to know if 94 was a big improvement over 91, I just want what's best for my car , performance wise and engine life wise.
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Old 09-17-2012, 12:12 AM   #47
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A lot of really good posts on this issue!
On a side note, 91 octane gas from the US has more detonation resistance then 94 octane from Canada. A lot of 91 octane tunes from cobb,diablosport,etc... will detonate on our 94 octane. This is a heads up for you turbocharged guys uploading pre-programmed tunes. Fortunately a lot of the newer vehicles have good knock detection and can retard timing to save your engine. But remember no 2 cars are identical. Always check your new tunes on a dyno where gains/losses and detonation can be monitored.

Back to your original question Mugen Evolution. Most late model naturally aspirated honda/acura engines can reach mean best timing a few degrees before detonation occurs. That means chances are you won't benefit from a higher octane fuel assuming your tune is correct.
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Old 09-17-2012, 02:15 PM   #48
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I've noticed that as well, I can not run the Cobb OTS 93 octane maps on our Chevron 94 gas without geting knocking. I even have knock when running the Cobb OTS 91 maps. In order to run knock free, I run about 2-3 degrees timing less than the Cobb OTS 91 octane maps. BTW, I'm monitoring knock using a MSD Dash hawk and Cobb AP to datalog.

Can anyone explain why our gas is so bad?
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Old 09-18-2012, 02:23 PM   #49
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no stock car sold in north america requires 94 octane
Evo X requires 93octane minimum, but can also run 91 or 87 if 93 is not available
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Old 10-01-2012, 05:06 PM   #50
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