Regular Gas?

Cjanik · 06-02-2009, 08:13 AM

some of you guys are funny.....higher octane does not = higher HP output

ChrisSlicks · 06-02-2009, 08:37 AM

Quote:

Originally Posted by Cjanik

some of you guys are funny.....higher octane does not = higher HP output

The car is built for 91 octane, lower octane will produce knock which will cause the ECU to retard the timing and reduce power. Normally increasing octane does not increase power output as the ECU does not advance timing beyond it's preset.

However in this car it actually might. The engine computer reportedly continues to advance the timing until it detects knock. There's been reports of high octane race gas producing a measurable power boost on the dyno. How true this is I don't know, haven't been able to measure this first hand.

That said I use 93 because they don't have 91 locally.

Modshack · 06-02-2009, 09:41 AM

Quote:

Originally Posted by ChrisSlicks

The car is built for 91 octane, lower octane will produce knock which will cause the ECU to retard the timing and reduce power. Normally increasing octane does not increase power output as the ECU does not advance timing beyond it's preset.

However in this car it actually might. The engine computer reportedly continues to advance the timing until it detects knock. There's been reports of high octane race gas producing a measurable power boost on the dyno. How true this is I don't know, haven't been able to measure this first hand.

That said I use 93 because they don't have 91 locally.

Exactly..

My Corvette had 2 distinct timing maps. When knock was detected it would default to the Low octane Map. It's amazing how many cheapskate Vette owners run regular! Most Import ECU systems are a little more sophisticated and alter timing dynamically, always seeking the most advance possible up to the knock threshold.

Modshack · 06-02-2009, 09:43 AM

Quote:

Originally Posted by Cjanik

some of you guys are funny.....higher octane does not = higher HP output

BUT more timing does..

semtex · 06-02-2009, 10:37 AM

Quote:

Originally Posted by Cjanik

some of you guys are funny.....higher octane does not = higher HP output

Hmm . . . I think you kinda missed the mark on this one, as hp gains with high octane has already been dyno tested and proven with the 370Z.

YouTube - XXX Race Gas gains 14whp on stock 370z

Edit: This was original posted here -> XXX Racing Fuel gains 14whp on stock 370Z

Modshack · 06-02-2009, 10:53 AM

Quote:

Originally Posted by semtex

Hmm . . . I think you kinda missed the mark on this one, as hp gains with high octane has already been dyno tested and proven with the 370Z.

Yup....Apparently the Z has a pretty broad ability to adapt timing to available octane.
On my old Audi, the only difference between a 93 octane flash and a 100 octane flash was timing changes, good for 20-30 hp with that alone..

TheWeatherman · 06-02-2009, 11:49 AM

My dealer, I would imagine, used regular for its first tank as well. Think about a lot of dealers... It's all about the almighty dollar. Anyway, I noticed that my first tank of gas, running well within the break-in procedure, I only returned about 19.5-20.5 MPGs. I put in my Shell V-Power (and then made the "V" sign with my fingers to all the people who passed me. he he. JK. Their ad) my MPG's jumped to between 23.5-26.5. Initial few miles? Maybe, but I think it could've been the gas.

LennyZCSD · 03-23-2013, 08:49 PM

Quote:

Originally Posted by leepeen

When i picked up my 370z at the dealership, they've also filled my Z's tank with 89

octane gas, eventhough the minimum recommendation for octane usage is 91.

However, i don't think it damaged my engine at all, but i can ensure you that when you

fill your Z's tank with 91 octane, you can feel minor improvement compare to 89.(only if

you are extreamly sensitive person.)Personally, i put premium gas(94octane) everytime i

fill my Z's tank, and i can feel way better power than 89 octane. Occasionally, i put

Lucas octane booster with premium gas(94), which it might be raise the octane number

up to 98(approxi), and it makes me think that i've moded my Z

eventhough it's 100% stock. Just opinion

Dealers are BS,,, I caught them going to put in oil from a barrel in my Z on an oil change, Put a quick stop to that. I am glad I always hang around when someone it messing with my Z

CBRich · 06-02-2009, 09:22 AM

I know for a fact that the 06 Accord V6 I had recommended regular gas but would advance the timing as much as it could. A Honda Engineer actually stated in an interview that you would gain about 10hp by using premium.

I see no reason why the 370Z can't be doing the same. But thanks for coming in Mr. 14Posts and trying to talk down to everyone.

koojo · 06-02-2009, 09:54 AM

Does the manual say 'recommend' or 'require' premium?

2theextreme · 06-02-2009, 09:59 AM

Quote:

Originally Posted by koojo

Does the manual say 'recommend' or 'require' premium?

Here's what it says:

Recommended specifications:

Unleaded gasoline with an octane rating of at least 91 AKI (RON 96)*1

I looked up 91 AKI and that falls in the category of Premium...at least according to this photo on Wikipedia:

http://en.wikipedia.org/wiki/File:Ga...ne_Ratings.jpg

koojo · 06-02-2009, 10:00 AM

Quote:

Originally Posted by 2theextreme

Here's what it says:

Recommended specifications:

Unleaded gasoline with an octane rating of at least 91 AKI (RON 96)*1

I looked up 91 AKI and that falls in the category of Premium.

If it says 'Recommended' then you can fill up with regular and it'll be just fine, but don't make it a habit.

Cjanik · 06-02-2009, 06:50 PM

You guys seem to think im saying that 87 octane will do just as well as 91. I did not say that, However, the post above my last post stated that he'd (she'd?) bump their octane up as much as possible to get more and more HP.

most of you must have skipped my original post, I did not state 89 is just as good as 91. I know the difference, I may only have 14 posts here, but I'm not an idiot. And 89 is perfectly fine to use, as long as you dont floor it.

The compression on the 370z's engine is 11:1, having 110 octane is not going to give you more power over 95 octane, the engine is still only compressing the gas to a 11:1 ratio.

The only thing higher octane will do is allow you to compress it to a higher ratio and avoid knocking. as I stated in my last post, octane does NOT = hp gains. other factors = hp gains, not octane, It just allows those other factors to take place safely.

-edit, forgot to mention about that Z with the HP claims for having higher octane.
The race gas from XXX Racing Fuel is highly oxygenated, and that is most likely the cause for the gains. We all know that if you could compress more air into the cylinders, then you get a bigger bang - and thats how the race fuel from XXX Racing Fuel works. Regular gas typically has a oxygen weight of 2% while the XXX Racing Fuel 138 octane claims to contain nearly 20%!

CantZme · 06-02-2009, 06:56 PM

Theres a gas station about 2 miles from were i live that offers 103 octane i believe but at 8 bucks a gallon it can stay there. lol

semtex · 06-02-2009, 07:52 PM

That's a good point about the oxygenation, Cjanik.

06-02-2009, 09:54 AM	#10 (permalink)
koojo Base Member Join Date: Nov 2008 Location: Vermont Posts: 61 Drives: Infiniti G20 Rep Power: 18	Does the manual say 'recommend' or 'require' premium? __________________ 2000 Infiniti G20 (TURBOCHARGED - SR20DET) - FOR SALE - http://www.koojo.net/

06-02-2009, 06:50 PM	#13 (permalink)
Cjanik Track Member Join Date: May 2009 Location: Las Vegas Posts: 578 Drives: N/A Rep Power: 19	You guys seem to think im saying that 87 octane will do just as well as 91. I did not say that, However, the post above my last post stated that he'd (she'd?) bump their octane up as much as possible to get more and more HP. most of you must have skipped my original post, I did not state 89 is just as good as 91. I know the difference, I may only have 14 posts here, but I'm not an idiot. And 89 is perfectly fine to use, as long as you dont floor it. The compression on the 370z's engine is 11:1, having 110 octane is not going to give you more power over 95 octane, the engine is still only compressing the gas to a 11:1 ratio. The only thing higher octane will do is allow you to compress it to a higher ratio and avoid knocking. as I stated in my last post, octane does NOT = hp gains. other factors = hp gains, not octane, It just allows those other factors to take place safely. -edit, forgot to mention about that Z with the HP claims for having higher octane. The race gas from XXX Racing Fuel is highly oxygenated, and that is most likely the cause for the gains. We all know that if you could compress more air into the cylinders, then you get a bigger bang - and thats how the race fuel from XXX Racing Fuel works. Regular gas typically has a oxygen weight of 2% while the XXX Racing Fuel 138 octane claims to contain nearly 20%! Last edited by Cjanik; 06-02-2009 at 07:06 PM.

06-02-2009, 06:56 PM	#14 (permalink)
CantZme Base Member Join Date: Apr 2009 Location: Boston Posts: 82 Drives: N/A Rep Power: 18	Theres a gas station about 2 miles from were i live that offers 103 octane i believe but at 8 bucks a gallon it can stay there. lol __________________ A man who needs nothing is INVINCIBLE

06-02-2009, 07:52 PM	#15 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 55 Posts: 5,995 Drives: People to drink Rep Power: 34	That's a good point about the oxygenation, Cjanik. __________________ "There are no small accidents on this circuit." -- Ayrton Senna 316.8whp & 248 ft/lbs (Dyno Dynamics) \| 319whp & 256 ft/lbs (DynoJet) (04/23/10) Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

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06-02-2009, 08:13 AM	#1 (permalink)
Cjanik Track Member Join Date: May 2009 Location: Las Vegas Posts: 578 Drives: N/A Rep Power: 19	some of you guys are funny.....higher octane does not = higher HP output

06-02-2009, 11:49 AM	#7 (permalink)
TheWeatherman Enthusiast Member Join Date: Mar 2009 Location: Milwaukee, WI Posts: 265 Drives: 2009 370Z 6MTw/Sport Rep Power: 18	My dealer, I would imagine, used regular for its first tank as well. Think about a lot of dealers... It's all about the almighty dollar. Anyway, I noticed that my first tank of gas, running well within the break-in procedure, I only returned about 19.5-20.5 MPGs. I put in my Shell V-Power (and then made the "V" sign with my fingers to all the people who passed me. he he. JK. Their ad) my MPG's jumped to between 23.5-26.5. Initial few miles? Maybe, but I think it could've been the gas.

06-02-2009, 09:22 AM	#9 (permalink)
CBRich A True Z Fanatic Join Date: Apr 2009 Location: SC Posts: 2,464 Drives: 370Z Rep Power: 546	I know for a fact that the 06 Accord V6 I had recommended regular gas but would advance the timing as much as it could. A Honda Engineer actually stated in an interview that you would gain about 10hp by using premium. I see no reason why the 370Z can't be doing the same. But thanks for coming in Mr. 14Posts and trying to talk down to everyone.