Sunoco Leaded Racing Fuels - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Hotrodding Basics
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 08-27-2011, 12:33 AM
adam83's Avatar
Registered User
 
Last photo:
Join Date: Jan 2010
Location: Tacoma, WA
Age: 31
Posts: 220
Wiki Edits: 0

Thanks: 1
Thanked 0 Times in 0 Posts
Sunoco Leaded Racing Fuels

I want to know, when picking the right race fuel (which I've never bought before), is this one of those times I should be following the labels exactly for my particular engine, or do I just buy the highest octane one they have for maximum performance?

Now, I have a fresh 440 +30 in a 73 Duster, somewhere between 9:1 and 9.5:1 comp, ported 902 heads, very nice flowing custom hooker exhaust, torker 2 intake, weiand 1" spacer, holley 850 double pumper, turbo action 3500 stall, 30in tall street slicks, 3.93 diff. It's making around 460hp in the higher rpm range, I dont know exactly where I've never dyno'd it, the power is just a guess but I know Im close...

I run pump gas. I want to see what happens with some leaded racing fuel, and sunoco is the brand I looked up and they sell it in Auburn supposedly so Im gonna go get some. According to their chart, their basic PURPLE 110 octane standard fuel would be what I should get, but I want to know, would it be a bad idea to try out the 116 octane RED maximal??

Im not totally clueless, I did read that the Maximal's description, it's for engines up to 17:1 compression and 10,000 rpm, but from lack of experience, I dont know the answer here, IS THIS ONE OF THOSE "BIGGER IS BETTER" SITUATIONS? Should I stick with the recommended fuel, or get the top level fuel?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 08-27-2011, 04:53 AM
poncho62's Avatar
Out of the Loop Moderator
 
Last wiki edit: Streetbeasts links
Last journal entry: at car show
Last photo:
Join Date: Oct 2003
Location: Hanover, Ontario, Canada
Age: 62
Posts: 16,895
Wiki Edits: 5

Thanks: 20
Thanked 258 Times in 211 Posts
From what I have read about fuels, there comes a point where more octane makes no difference or can actually harm performance.....I am not expert either
__________________
Ontario Rodders

Budget RVs
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 08-27-2011, 06:05 AM
cool rockin daddy's Avatar
1.21 giga-watts???!!!!
 
Join Date: Aug 2003
Location: wherever cool cars are
Posts: 1,535
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
Does your car run fine on the pump gas? Have you had to take timing out of the engine to prevent it from pinging on the pump gas? If so, race gas may help you, but you will not benefit or notice a difference from running high octane racing gas UNLESS you are going to add more timing to your engine when running it. Octane is not a hp adder by itself.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 08-27-2011, 06:35 AM
Registered User
 
Join Date: Jun 2010
Location: TX
Posts: 1,181
Wiki Edits: 0

Thanks: 0
Thanked 105 Times in 96 Posts
Lead and octane rating

If you have no detonation problem with 93 octane pump gas with the initial timing advanced as far as possible and will still allow the engine to start, there is only one reason to use high octane leaded racing fuel. That is if you have over 125 lb. valve spring seat pressure. Leaded racing fuel will prevent the exhaust valve spring seats from premature erosion. IMO, using leaded racing fuel is an expensive way to keep the seats from being pounded out when it could be avoided just by using valve springs with no more than 110 - 115 lb. seat pressure.

High compression ratio and high valve spring seat pressure pressure is for race cars that do not see any street use. When 104 octane leaded gasoline was available at the pump, it was common to see cars with 125-150 lb. seat pressure and 11:1 compression ratio from the factory.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 09-13-2011, 10:19 AM
adam83's Avatar
Registered User
 
Last photo:
Join Date: Jan 2010
Location: Tacoma, WA
Age: 31
Posts: 220
Wiki Edits: 0

Thanks: 1
Thanked 0 Times in 0 Posts
Sorry for the late reply, I've been busy. I ended up trying both the Leaded Trick Racing Fuel (blue) and the Leaded Sunoco standard (purple). They sell them both at the pump in Auburn, WA. It could have been a placebo effect, but it really did feel like the car ran better, on both. it didnt gain much power, if any, but it seemed to run better. I know the lead lubricates so it's better anyways, but if I could afford it I'd run this stuff all the time. I didnt notic much of a difference between the 2 race fuels, but the guy told me something about end point temperature differences between the 2, which I still dont really understand, but the Trick Fuel had a lower end point temp so he recommended that one. He said the sunoco would run better with bigger jets in the carb, but I didnt notice much difference. Plus, my Holley has jumped up several jets sizes already
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 09-14-2011, 08:27 AM
S10xGN's Avatar
Gotta love a turbo!
 

Last journal entry: Body on Frame today.
Last photo:
Join Date: Aug 2004
Location: Port Neches, TX
Age: 61
Posts: 1,661
Wiki Edits: 0

Thanks: 0
Thanked 61 Times in 57 Posts
Quote:
Originally Posted by adam83
Sorry for the late reply, I've been busy. I ended up trying both the Leaded Trick Racing Fuel (blue) and the Leaded Sunoco standard (purple). They sell them both at the pump in Auburn, WA. It could have been a placebo effect, but it really did feel like the car ran better, on both. it didnt gain much power, if any, but it seemed to run better. I know the lead lubricates so it's better anyways, but if I could afford it I'd run this stuff all the time. I didnt notic much of a difference between the 2 race fuels, but the guy told me something about end point temperature differences between the 2, which I still dont really understand, but the Trick Fuel had a lower end point temp so he recommended that one. He said the sunoco would run better with bigger jets in the carb, but I didnt notice much difference. Plus, my Holley has jumped up several jets sizes already
Lower end-point components boil off quicker, making for easier starts. That's the primary difference in summer and winter fuels...

Russ
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 09-14-2011, 02:38 PM
adam83's Avatar
Registered User
 
Last photo:
Join Date: Jan 2010
Location: Tacoma, WA
Age: 31
Posts: 220
Wiki Edits: 0

Thanks: 1
Thanked 0 Times in 0 Posts
I see. My engine had absolutely no problems running on sunoco, I wonder if that will change in winter?
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 09-14-2011, 08:31 PM
cool rockin daddy's Avatar
1.21 giga-watts???!!!!
 
Join Date: Aug 2003
Location: wherever cool cars are
Posts: 1,535
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
Strictly a placebo effect. If you didn't put more timing into it and assuming this is not a computer controlled engine that would put it in for you, there would be absolutely NO performance difference from higher octane gasoline.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 09-14-2011, 09:11 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Quote:
Originally Posted by adam83
I want to know, when picking the right race fuel (which I've never bought before), is this one of those times I should be following the labels exactly for my particular engine, or do I just buy the highest octane one they have for maximum performance?

Now, I have a fresh 440 +30 in a 73 Duster, somewhere between 9:1 and 9.5:1 comp, ported 902 heads, very nice flowing custom hooker exhaust, torker 2 intake, weiand 1" spacer, holley 850 double pumper, turbo action 3500 stall, 30in tall street slicks, 3.93 diff. It's making around 460hp in the higher rpm range, I dont know exactly where I've never dyno'd it, the power is just a guess but I know Im close...

I run pump gas. I want to see what happens with some leaded racing fuel, and sunoco is the brand I looked up and they sell it in Auburn supposedly so Im gonna go get some. According to their chart, their basic PURPLE 110 octane standard fuel would be what I should get, but I want to know, would it be a bad idea to try out the 116 octane RED maximal??

Im not totally clueless, I did read that the Maximal's description, it's for engines up to 17:1 compression and 10,000 rpm, but from lack of experience, I dont know the answer here, IS THIS ONE OF THOSE "BIGGER IS BETTER" SITUATIONS? Should I stick with the recommended fuel, or get the top level fuel?
100 octane gas would be all that's needed w/the CR you're running, provided that estimate is correct or not much higher. 93 may even be all you need.

To find out you need to run at the track using both fuels under the same ambient conditions. Baseline it on the 93 pump gas (this assumes you've optimized the tune for 93 octane), then use the high octane gas and vary the total timing and possibly jetting to see if it picks up ET. Seat of the pants dyno estimations are basically useless when you're talking about 0.10 second changes in ET.
Reply With Quote Quick reply to this message

Recent Hotrodding Basics posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
110 sunoco race fuel datson280zxturbo Engine 10 06-02-2006 09:40 PM
Alternative fuels....way of the future? joe350s10 Hotrodders' Lounge 3 05-12-2006 02:12 PM
Alternate fuels D200Dodge Hotrodders' Lounge 15 02-10-2005 01:52 PM
Sunoco = American gas supplier?? '54-Hunter Hotrodders' Lounge 2 02-26-2003 03:28 PM
Alternative fuels E85 wrenchturner Hotrodders' Lounge 4 05-09-2002 06:35 PM


All times are GMT -6. The time now is 06:25 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.