Race Gas, NA?
10-18-2006, 08:13 AM
#42
Originally Posted by jackie chan
10.3:1 is high compression and calls for race gas....now i have heard it all.
KaboomSo, on a stock 10.3to 1 compression car, the difference between 87 and 91 is big. So difference between 91 and 100 should be just as big.
Thanks for making me look smarter.
10-19-2006, 07:51 AM
#43
Registered User
iTrader: (7)
Join Date: Apr 2005
Location: Bradenton/Sarasota
Posts: 5,254
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by danielwebb
I have a popcharger only and I put in about 33% 100 octane to 66% 93 today and I could tell a deffinite difference.
10-19-2006, 03:00 PM
#47
Banned
iTrader: (27)
Join Date: Sep 2006
Location: Concord, North Carolina
Posts: 3,485
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by chimmike
10-20-2006, 07:32 AM
#49
Originally Posted by chimmike
yup. it smells great as it kills your oxygen sensors.
Well some of us don't mind.
But I do agree, anything under 600whp should be fine with 100 octane, there shouldn't be any knock being recorded with 100. No need to go any higher into the leaded gases.
10-20-2006, 07:52 AM
#52
Registered User
iTrader: (7)
Join Date: Apr 2005
Location: Bradenton/Sarasota
Posts: 5,254
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by danielwebb
If 93 dynos higher than 91 why wouldn't 95 or so dyno better than 93? Or is 93 the magic octane that makes z's operate at maximum efficiency?
because the ignition timing was tuned for high octane gas. But beyond the 93 pump taht the ECU was meant for, there's nothing to be gained.
OCTANE DOES NOT MAKE HORSEPOWER, IT HAS TO BE TUNED FOR HIGHER OCTANE TO MAKE THE HIGHER HORSEPOWER!
10-20-2006, 09:46 AM
#54
Registered User
iTrader: (5)
Join Date: Jul 2005
Location: Tampa Fl.
Posts: 62
Likes: 0
Received 0 Likes
on
0 Posts
Maybe this will help.
I asked Sharif about high octane on N/A w/ Utec in this thread, and he said they had tried it and didn't get any significant gain.
The major advantage to high octane is to prevent detonation. So, you could advance timing without knock. However, it seems that the VQ stops responding to added timing before it starts to knock. So, there wouldn't be a big difference.
I asked Sharif about high octane on N/A w/ Utec in this thread, and he said they had tried it and didn't get any significant gain.
The major advantage to high octane is to prevent detonation. So, you could advance timing without knock. However, it seems that the VQ stops responding to added timing before it starts to knock. So, there wouldn't be a big difference.
10-20-2006, 09:58 AM
#55
Chicago Realtor
Join Date: Mar 2003
Location: chicago
Posts: 938
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Ztampa
Maybe this will help.
I asked Sharif about high octane on N/A w/ Utec in this thread, and he said they had tried it and didn't get any significant gain.
The major advantage to high octane is to prevent detonation. So, you could advance timing without knock. However, it seems that the VQ stops responding to added timing before it starts to knock. So, there wouldn't be a big difference.
I asked Sharif about high octane on N/A w/ Utec in this thread, and he said they had tried it and didn't get any significant gain.
The major advantage to high octane is to prevent detonation. So, you could advance timing without knock. However, it seems that the VQ stops responding to added timing before it starts to knock. So, there wouldn't be a big difference.
Do you know what modifications the car had? and what does significant gains mean?
10-20-2006, 10:43 AM
#56
I don't know what you guys are smoking, but it must be strong.
I am living proof that 100 octane helped in my Z. You can either believe or not, but it does. Especially in hot weather where these engines do "knock", and if you have race gas it wont knock therefore you have more power.
The timing you guys are talking about is base timing. Base timing doesn't prove $hit. The ecu will advance timing until it detects knock, then it will retard until its gone, then advance again. That is the purpose of ignition timing.
Race gas will advance timing to the limit the ecu is willing to go without knock and it will keep it there all across the rpm range. So on a 105 degree day, a z with race gas vs a z with 91 octane. You're telling me they are equal in power? Sorry I don't buy it, I know race gas makes a difference and I can prove it if anyone in CA has the same mods as I do wants to do a quick run.
I am living proof that 100 octane helped in my Z. You can either believe or not, but it does. Especially in hot weather where these engines do "knock", and if you have race gas it wont knock therefore you have more power.
The timing you guys are talking about is base timing. Base timing doesn't prove $hit. The ecu will advance timing until it detects knock, then it will retard until its gone, then advance again. That is the purpose of ignition timing.
Race gas will advance timing to the limit the ecu is willing to go without knock and it will keep it there all across the rpm range. So on a 105 degree day, a z with race gas vs a z with 91 octane. You're telling me they are equal in power? Sorry I don't buy it, I know race gas makes a difference and I can prove it if anyone in CA has the same mods as I do wants to do a quick run.
10-20-2006, 05:02 PM
#57
Sponsor
Forged Internals.com
Forged Internals.com
Join Date: Sep 2006
Location: Marietta, GA
Posts: 35
Likes: 0
Received 0 Likes
on
0 Posts
I agree with Backtuner 100%. We have tested this theory countless times on the dyno. Simply adding race fuel to an already well tuned NA or FI car will yield no whp/trq improvment.
10-20-2006, 07:01 PM
#58
Registered User
iTrader: (35)
Join Date: Sep 2005
Location: Georgia
Posts: 2,071
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by 97supratt
I don't know what you guys are smoking, but it must be strong.
I am living proof that 100 octane helped in my Z. You can either believe or not, but it does. Especially in hot weather where these engines do "knock", and if you have race gas it wont knock therefore you have more power.
The timing you guys are talking about is base timing. Base timing doesn't prove $hit. The ecu will advance timing until it detects knock, then it will retard until its gone, then advance again. That is the purpose of ignition timing.
Race gas will advance timing to the limit the ecu is willing to go without knock and it will keep it there all across the rpm range. So on a 105 degree day, a z with race gas vs a z with 91 octane. You're telling me they are equal in power? Sorry I don't buy it, I know race gas makes a difference and I can prove it if anyone in CA has the same mods as I do wants to do a quick run.
I am living proof that 100 octane helped in my Z. You can either believe or not, but it does. Especially in hot weather where these engines do "knock", and if you have race gas it wont knock therefore you have more power.
The timing you guys are talking about is base timing. Base timing doesn't prove $hit. The ecu will advance timing until it detects knock, then it will retard until its gone, then advance again. That is the purpose of ignition timing.
Race gas will advance timing to the limit the ecu is willing to go without knock and it will keep it there all across the rpm range. So on a 105 degree day, a z with race gas vs a z with 91 octane. You're telling me they are equal in power? Sorry I don't buy it, I know race gas makes a difference and I can prove it if anyone in CA has the same mods as I do wants to do a quick run.
10-21-2006, 11:24 AM
#60
Chicago Realtor
Join Date: Mar 2003
Location: chicago
Posts: 938
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by chimmike
again, increasing octane alone does not ADD power without a change in tune to adjust ignition timing for the additional octane.
^^ This is not aimed only at you....Dont you people read? We have been discussing the potential of higher octane WITH a tune. And this thread is going on and on w/no point to some post, only a few guys inn this thread have actually tried it, some say theyve seen power and some said no power.
So please if you are just talking out your *** move on.