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.

chubbs · 06-02-2009, 11:56 AM

I imagine it'll be the same as the 350z - the ECU will adjust itself to to the poorer fuel, meaning you have less power, but your engine won't be damaged.

That said, why buy a greyhound and feed it on slops, if you know what I mean?

semtex · 06-02-2009, 11:58 AM

Quote:

Originally Posted by chubbs

That said, why buy a greyhound and feed it on slops, if you know what I mean?

Hey how did you know about my wife's cooking?

NotmyGTR · 06-02-2009, 12:11 PM

Doesnt the inside of the trap door for the gas cap say "Premium Fuel Only"? I know mine does......I read it twice a week.

AK370Z · 06-02-2009, 02:26 PM

Quote:

Originally Posted by TheWeatherman

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.

Agree. I asked my sales rep what kind of gas he put in the tank (I got Free full tank) and he assured me it was premium. I told him I have a device that I can use to check if it's premium or not (I was just bs'ing around) and if it's not premium, I'm bringing the Z back! His reply, " I swear, I put 93 premium!"... I was just joking anyway...

To the OP, you'll be fine. Just wait till the tank is half or 1/4, then fill it up with 93.

06-02-2009, 11:56 AM	#8 (permalink)
chubbs A True Z Fanatic Join Date: Jan 2009 Location: Zeeland Posts: 1,046 Drives: 2016 370z Auto-Grey Rep Power: 7588	I imagine it'll be the same as the 350z - the ECU will adjust itself to to the poorer fuel, meaning you have less power, but your engine won't be damaged. That said, why buy a greyhound and feed it on slops, if you know what I mean? __________________ . '03 Grey >>> '06 Black >>>'10 Silver >>> '16 Grey ^

06-02-2009, 12:11 PM	#10 (permalink)
NotmyGTR Base Member Join Date: May 2009 Location: TX Posts: 177 Drives: 09 370Z/Pearl 6speed Rep Power: 18	Gas cap Doesnt the inside of the trap door for the gas cap say "Premium Fuel Only"? I know mine does......I read it twice a week. __________________ 1996 Skyline GT-R LM fully tuned by Mines/2006 Nissan Titan 5.6 SE Texas Edition/2009 370 Base w Sport Pkg

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.