Sunoco EXO2 Fuel

[RDY4WAR]

I'm interested in knowing more about this fuel. There's a place somewhat local to me that has it. According to the Sunoco rep I spoke to, it contains both methanol and ethanol.

Octane (R+M)/2 = 107
Research Octane = 114
Motor Octane = 100
Specific Gravity = 0.750
RVP = 7.3 psi
10% = 139*F
50% = 160*F
90% = 225*F
FBP = 241*F
Stoich AFR = 13.2
Oxygen = 10%
H/C ratio = 2.22
O/C ratio = 0.1
BTU/gal = 102,600
BTU/lb = 16,700
Leaded = Yes

The application is a bolt-on Gen 2 LT1 5.7L in a '93 Camaro. It runs good on E10 93 pump gas, but searching for every bit of power I can out of bolt-on parts. If there's power to be had with this fuel, I wouldn't mind trying it. Sunoco Rep said there would be some power gain with it, but want to make sure he isn't just trying to sell the product.

Has anyone switched to it from pump fuel?

[David Redszus]

I'm interested in knowing more about this fuel. There's a place somewhat local to me that has it. According to the Sunoco rep I spoke to, it contains both methanol and ethanol.

Octane (R+M)/2 = 107
Research Octane = 114
Motor Octane = 100
Specific Gravity = 0.750
RVP = 7.3 psi
10% = 139*F
50% = 160*F
90% = 225*F
FBP = 241*F
Stoich AFR = 13.2
Oxygen = 10%
H/C ratio = 2.22
O/C ratio = 0.1
BTU/gal = 102,600
BTU/lb = 16,700
Leaded = Yes

The application is a bolt-on Gen 2 LT1 5.7L in a '93 Camaro. It runs good on E10 93 pump gas, but searching for every bit of power I can out of bolt-on parts. If there's power to be had with this fuel, I wouldn't mind trying it. Sunoco Rep said there would be some power gain with it, but want to make sure he isn't just trying to sell the product.

Has anyone switched to it from pump fuel?

All things being equal, I would expect this fuel to make about 3.6% less power than similar race fuels.
The reduced specific power may be compensated by improved evaporative cooling and resulting higher
air density.
It looks like a fuel intended for high speed engine operation based on its temperature curve. It might
provide an improved throttle response in a carb application.

Beware of water absorption; alcohols like to drink water.

[RDY4WAR]

I'm interested in knowing more about this fuel. There's a place somewhat local to me that has it. According to the Sunoco rep I spoke to, it contains both methanol and ethanol.

Octane (R+M)/2 = 107
Research Octane = 114
Motor Octane = 100
Specific Gravity = 0.750
RVP = 7.3 psi
10% = 139*F
50% = 160*F
90% = 225*F
FBP = 241*F
Stoich AFR = 13.2
Oxygen = 10%
H/C ratio = 2.22
O/C ratio = 0.1
BTU/gal = 102,600
BTU/lb = 16,700
Leaded = Yes

The application is a bolt-on Gen 2 LT1 5.7L in a '93 Camaro. It runs good on E10 93 pump gas, but searching for every bit of power I can out of bolt-on parts. If there's power to be had with this fuel, I wouldn't mind trying it. Sunoco Rep said there would be some power gain with it, but want to make sure he isn't just trying to sell the product.

Has anyone switched to it from pump fuel?

All things being equal, I would expect this fuel to make about 3.6% less power than similar race fuels.
The reduced specific power may be compensated by improved evaporative cooling and resulting higher
air density.
It looks like a fuel intended for high speed engine operation based on its temperature curve. It might
provide an improved throttle response in a carb application.

Beware of water absorption; alcohols like to drink water.

Roger that. What's your thoughts on VP C45? Better yet, what fuel do you feel would be most beneficial to this setup?

Full engine specs...

1993 LT1 5.7L w/ 161k miles
Stock aluminum heads (flows ~202 cfm @ .500")
Stock short runner intake
Stock roller cam (202/207 @ .050", .449"/.460" lift, 116.5 LSA)
Stock 10.4:1 static compression
Engine has reverse cooling (heads cooled before block)
Stock EFI tuned in open loop only with speed density
1.7 roller rockers (brings lift to .504"/.521")
52mm throttle body
Ram air from bumper (sorta modern pro stock style)
Electric water pump
ATI 10% U/D super damper w/ aluminum shell
Moroso 7qt pan w/ 5.5 qts of 0w-10 oil
1-3/4" x 33" longtubes to 3" x 18" collectors/dumps
Crankcase evacuation
AC, PS, and alt. deleted (16v system)
Stage at 130-140°F coolant temps

Again noting that it will take whatever tuning I can throw at it on E10 93 as it is.

Trans is a TH350 w/ a 9" 4000 stall and 4.10 rear gear. Peak HP is 5200-5500 rpm, rev limiter set at 6250 rpm.

It's restricted mostly by the cam.

[rustbucket79]

I’ve found reliably and somewhat frustrating that VP Q-16 makes 10 hp more in most any engine.

[David Redszus]

I'm interested in knowing more about this fuel. There's a place somewhat local to me that has it. According to the Sunoco rep I spoke to, it contains both methanol and ethanol.

Octane (R+M)/2 = 107
Research Octane = 114
Motor Octane = 100
Specific Gravity = 0.750
RVP = 7.3 psi
10% = 139*F
50% = 160*F
90% = 225*F
FBP = 241*F
Stoich AFR = 13.2
Oxygen = 10%
H/C ratio = 2.22
O/C ratio = 0.1
BTU/gal = 102,600
BTU/lb = 16,700
Leaded = Yes

The application is a bolt-on Gen 2 LT1 5.7L in a '93 Camaro. It runs good on E10 93 pump gas, but searching for every bit of power I can out of bolt-on parts. If there's power to be had with this fuel, I wouldn't mind trying it. Sunoco Rep said there would be some power gain with it, but want to make sure he isn't just trying to sell the product.

Has anyone switched to it from pump fuel?

All things being equal, I would expect this fuel to make about 3.6% less power than similar race fuels.
The reduced specific power may be compensated by improved evaporative cooling and resulting higher
air density.
It looks like a fuel intended for high speed engine operation based on its temperature curve. It might
provide an improved throttle response in a carb application.

Beware of water absorption; alcohols like to drink water.

Roger that. What's your thoughts on VP C45? Better yet, what fuel do you feel would be most beneficial to this setup?

Full engine specs...

1993 LT1 5.7L w/ 161k miles
Stock aluminum heads (flows ~202 cfm @ .500")
Stock short runner intake
Stock roller cam (202/207 @ .050", .449"/.460" lift, 116.5 LSA)
Stock 10.4:1 static compression
Engine has reverse cooling (heads cooled before block)
Stock EFI tuned in open loop only with speed density
1.7 roller rockers (brings lift to .504"/.521")
52mm throttle body
Ram air from bumper (sorta modern pro stock style)
Electric water pump
ATI 10% U/D super damper w/ aluminum shell
Moroso 7qt pan w/ 5.5 qts of 0w-10 oil
1-3/4" x 33" longtubes to 3" x 18" collectors/dumps
Crankcase evacuation
AC, PS, and alt. deleted (16v system)
Stage at 130-140°F coolant temps

Again noting that it will take whatever tuning I can throw at it on E10 93 as it is.

Trans is a TH350 w/ a 9" 4000 stall and 4.10 rear gear. Peak HP is 5200-5500 rpm, rev limiter set at 6250 rpm.

It's restricted mostly by the cam.

A fuel recommendation cannot be made from the information provided. Your hardware list contains no
useful data.

What is needed is data relating to inlet air temperatures, IVC, inlet pressures, timing curves, torque curves, etc.
And weather conditions.

In the absence of the needed data, almost any 100 octane race gas will do the job.

[RDY4WAR]

A fuel recommendation cannot be made from the information provided. Your hardware list contains no
useful data.

What is needed is data relating to inlet air temperatures, IVC, inlet pressures, timing curves, torque curves, etc.
And weather conditions.

In the absence of the needed data, almost any 100 octane race gas will do the job.

Ambient air temps, when attempting to set the bolt-on record, will be around 40-50*F. The IAT rides ~30*F above ambient when staged and draws closer to ambient down track as the ram air gets to working.

IVC is 36* ABDC @ .050". The seat / .006" figures are unknown, not published by GM, but I would approximate around 68-70* ABDC. Cranking pressure is good at 165-175 psi across all 8 cylinders (warm engine).

The current spark timing curve is...

RPM - Spark *BTDC

2000 - 23
2200 - 27
2400 - 30
2800 - 33
3200 - 34
3600 - 34
4000 - 34
4500 - 35
5000 - 37
5500 - 38
6000 - 38
6500 - 38

Peak torque is ~350 rwtq @ 4000-4400 rpm and ~310 rwtq @ 5400 rpm. Peak HP is ~320 rwhp @ 5400 rpm.

The weather conditions expected on the nights I attempt to reset the record will be similar to...

Temperature - 50*F
Humidity - 80%
Uncorrected barometer - 29.90 Hg
Dew point - 45*F
Grains - 45
Density altitude = -300 ft

The chambers are ~54.5 cc wedge chambers, 1.94/1.50 valves on stock 23* angle, stock .047" head gaskets, and pistons ~.025" in the hole. Plugs are NGK TR55 at .055-.060" gap.