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Subject: "What octane should I use?" Previous topic | Next topic
Talon95StangApr-01-02 05:07 AM
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#19006, "What octane should I use?"


          

I just want to know what octane to use because right now i use 93 and i'm getting system rich. Here is my mod:

milled head .020
5 angle valve
regrined cams and gears

compression test: 175 : 175 : 175 : 175

I'm also going to be running nitrous soon. but do i need 93 now or could i use 87 or 89?

venomtalon@aol.com

Performance Mods: Custom CAI, Jeep 60mm TB, Ported Intake Manifold with Jeep TB match, 5 angle valve job, Head milled .020, Regrind Cams, PT Lifters and Rockers, AEM Cam Gears, OBX Wires, NGK Plugs, AFX UDP, OBX Header, OBX

  
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Replies to this topic
RE: What octane should I use?, RoboTechDSM, Apr-01-02 05:18 AM, #1
RE: What octane should I use?, Breezio, Apr-01-02 05:20 AM, #2
      RE: What octane should I use?, Talon95Stang, Apr-01-02 05:28 AM, #3
           RE: What octane should I use?, TeamJeff_99gs, Apr-01-02 06:21 AM, #4
                RE: What octane should I use?, Marctronixx, Apr-01-02 06:32 AM, #5
                     RE: What octane should I use?, 1TuffRS, Apr-01-02 10:26 AM, #6
                          RE: What octane should I use?, Teamdougie2, Apr-01-02 10:37 AM, #7

RoboTechDSMApr-01-02 05:18 AM
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#19007, "RE: What octane should I use?"
In response to Reply # 0



          

If you don't have nitrous or turbo, USE the cheapest gas (87-89 octance). I'm not sure about this theory here, but if you use a hi-octane gas, your not burning all the fuel mixtures. Probable cause of you going rich. Although there are other factors of going rich. Our engines are designed to run with 'regular' gas. Somebody here knows more about this I'm sure!!!!



Kris
"Someday............I'll have traction problems!!!!"
Tampa, FL
Pinoy Turbo 2GNT

1999 HRC Turbo RS
Stage 2
Auto with BOOST!!!!!!!!!!!!

  
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BreezioApr-01-02 05:20 AM
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#19008, "RE: What octane should I use?"
In response to Reply # 1

          

yeah, the ECU is designed for 87 octane gas. if you use any higher (without a turbo, high compression, or nitrous) you are just wasting you money.

  
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Talon95StangApr-01-02 05:28 AM
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#19009, "RE: What octane should I use?"
In response to Reply # 2

          

I know but with my head milled I should have like 10.1 to 1, right?

venomtalon@aol.com

Performance Mods: Custom CAI, Jeep 60mm TB, Ported Intake Manifold with Jeep TB match, 5 angle valve job, Head milled .020, Regrind Cams, PT Lifters and Rockers, AEM Cam Gears, OBX Wires, NGK Plugs, AFX UDP, OBX Header, OBX

  
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TeamJeff_99gsApr-01-02 06:21 AM
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#19010, "RE: What octane should I use?"
In response to Reply # 3



          

87 should be fine.

  
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MarctronixxApr-01-02 06:32 AM
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#19011, "RE: What octane should I use?"
In response to Reply # 4

          

i dont know.. i have a stock motor with just a iceman and using the one range hotter plugs /magnecore wires..

i use 93 as the higher octane reduces early detonation and that causes engine probelms if the fuel detonates too early.. the brain may be set up for 87 but they have MAP sensors and they will adjust to the fuel being used...

i even used 93 in my Yugo (first car) and it got great performance emoji

thats how i feel..

  
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1TuffRSApr-01-02 10:26 AM
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#19012, "RE: What octane should I use?"
In response to Reply # 5

          

i think that with high compression you should go ahead and go the safe route and use 93 octane, but you should wait until some of the all motor guys respond




Toney
'97 RS 5 Speed (totaled)
15.4606@88.42 Mph
96 Toyota Celica GT
88 Toyota Supra NA-T (w/ sports package)
Got Boost?? Hell yeah I-6 turbo powah baby!

  
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Teamdougie2Apr-01-02 10:37 AM
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#19013, "RE: What octane should I use?"
In response to Reply # 6



          

You need an S-AFC to lean it out. Also, you must run at least 93 octane when you use the nitrous.


Doug

Xtreme Performance Services
Race Engines 路 Transmissions 路 Turbo Systems 路 EFI & Tuning 路 Fabrication 路 Welding
www.xtremefabrications.com

  
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