Is this true?

Coupe50h · 11-22-2004, 10:58 AM

I've done some testing, on different fuels, vp 103 motorsport, 93 pump, midgrade ect....I found my car ran best on midgrade, i do belive my motor is low compression because of the heads.
however My buddies 93 gt loves vp fuel.....so it depends on timing, mods, maybe even weather?

Unit 5302 · 11-22-2004, 09:17 PM

High compression is just one example (most common) for why vehicles require higher octane fuel from the factory. The further advanced your timing, again, the slower the burn needs to be. Carbon build ups, lean fuel mixtures, and hot running engines can also increase the need for greater octane rating.

Dark_5.0 · 11-23-2004, 02:28 PM

My 01 cobra ran way better with regular unleaded fuel. I think the high altitude has something to do with it.

I also run regular unleaded in my 90 coupe and it traps 107

11-22-2004, 10:58 AM	#1
Coupe50h Registered Member Join Date: Aug 2002 Location: SanAntonio, Tx Posts: 957	Re: Is this true? I've done some testing, on different fuels, vp 103 motorsport, 93 pump, midgrade ect....I found my car ran best on midgrade, i do belive my motor is low compression because of the heads. however My buddies 93 gt loves vp fuel.....so it depends on timing, mods, maybe even weather? __________________ X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear

11-22-2004, 09:17 PM	#2
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	Re: Is this true? High compression is just one example (most common) for why vehicles require higher octane fuel from the factory. The further advanced your timing, again, the slower the burn needs to be. Carbon build ups, lean fuel mixtures, and hot running engines can also increase the need for greater octane rating.

11-23-2004, 02:28 PM	#3
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Re: Is this true? My 01 cobra ran way better with regular unleaded fuel. I think the high altitude has something to do with it. I also run regular unleaded in my 90 coupe and it traps 107 __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

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