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Re: 85 degrees yesterday.... (Sue Esponte)

Quote, originally posted by Sue Esponte »
...and boy, did that other guy in the S4 seem faster than I remembered it over the winter! And, yes, my A/C was off.

Welcome to the summer, fellow turbo owners.

-Eric

time to get that 55 gallon drum of toluene


premium almost costs as much as it now
 

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Took me $50 to fill up yesterday. Haven't spent that much since the SUV days.

Car did feel a bit slower in the higher gears yesterday. Time to really seach for that 100 octane gas station around me...hm
 

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Discussion Starter · #4 ·
Re: (HJZ)

Just my 1/2 cent, non-techie opinion, but I don't think 100 octane will do squat in a car that isn't programmed to take advantage of it. I believe OEM programming is engineered to run most effeciently on 93 octane (98 RON), so unless your ECM is upgraded with a 100 octane program, I'd skip the additional cost and pray for the heatwaves to pass quickly.


-Eric
 

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Re: (Sue Esponte)

I'm not really sure on this myself. But most of my more knowledgeable turbo friends have said the same thing. However, if the ECU adjusts, or has a learning process, one could argue that 100 octane with ECU reset might just bring the car to adapt for the better. Again, just my reasoning, and it's backed by really nothing, lol.
 

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Re: (Sue Esponte)

Quote, originally posted by Sue Esponte »
Just my 1/2 cent, non-techie opinion, but I don't think 100 octane will do squat in a car that isn't programmed to take advantage of it. I believe OEM programming is engineered to run most effeciently on 93 octane (98 RON), so unless your ECM is upgraded with a 100 octane program, I'd skip the additional cost and pray for the heatwaves to pass quickly.


-Eric

i think many have found that the engine pulls timing in the heat to prevent detonation... higher octane will help this.
 

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Discussion Starter · #7 ·
Re: (HJZ)

Quote, originally posted by HJZ »
...However, if the ECU adjusts, or has a learning process, one could argue that 100 octane with ECU reset might just bring the car to adapt for the better.

It is my understanding that the programming does adapt somewhat to driver-type and conditions, but I think it's adaptability is limited to how it can best take advantage of the original engineering specs. In other words, it can't make a FWD bias haldex learn a RWD bias despite the fact that it might help the car handle better in certain situations. I just don't think the R's brain has enough logic for it to adapt to the type of change you are describing....but what the hell do I know?


-Eric
 

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Re: (HJZ)

We've jumped over $3 here for Amoco 93, and its rising daily.

Come peak driving season, this car may be a $60+ fill on premium.

I don't even want to think what racing grades will be selling for.

This summer, I'll just open the sunroof wide and think I'm going faster than I really am.
 

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Re: (Sue Esponte)

I don't have any ECU upgrades and I definitely feel the car being faster when I take about 8-9 gallons of 100 and mix it with 91 or even 93.

The car pulls much harder than when 91 octane is in the tank. I don't say I understand why, just stating that it DOES make a difference (considerably).

I don't have a timer or anything to test it out, but I know it pulls much harder than with just 91...even with 93, I can feel a difference compared to mixing 100.

If you haven't tried it out, then you should and you can see for yourself. It definitely pushes me back in my seat when I take off from a roll at the right RPM.

Regards,

Paul
 

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Re: (sgmlaw)

Quote, originally posted by sgmlaw »
We've jumped over $3 here for Amoco 93, and its rising daily.

Come peak driving season, this car may be a $60+ fill on premium.

Paid $3.09 for the Amoco 93 on Tuesday ($40 fill up) an noticed that it went to $3.19 on Wednesday. If I remember correctly, I paid $3.79 at the peak (post Katrina) and a $50 fill.
 

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I live in the so cal DESERT where it would be at 115-120 degrees ALL stinkin' day long....

just what you DON'T want with a car like the R..

I have experimented in the heat running 91 vs high octane. I can tell you for a fact, without a doubt, there is something about the higher octane fuel that offsets the heat. My car on 100 octane fuel ran almost as fast as it does on 91 in 50-60 degrees. that was in 100-110 heat.

I had the EVOLVE ECU and exhaust at the time...so maybe on a stock car you wouldn't notice it..i dno't know.

I think that the higher octane must offset detonation....and detonation is more likely to occur as temps increase....so as the outside air gets hotter..it gets hotter in the combustion chamber...and that leads to pre-ignition/detonation...so then the ECU turns timing back....and you lose power. Higher octane is more stable...it prevents detonation...so you're able to maintain more advanced timing despite higher temps.

that's my understanding.....remember..I'm a lawyer..not an engineer....so I'm just regurgitating what I've read/been told...but my real world experiences...at least on MY car...say high octane helps in the heat.
 

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Tuesday was $3.15 up here, then $3.01 on wednesday, and I filled up at $3.05 last nite.

Looks like we won't see anything <$3.00 for the rest of the summer
 

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Discussion Starter · #14 ·
Re:

Not to rehash this again, but all of the comparisons you're all offering are between 91 and some mix of 91/100 to get what people hope will yield 93 or greater. Everything is anecdotal when we talk about differences between 93/94 and 100 (not 91 and something higher). Show me a dyno comparison of 93/94 and 100. Pretend I'm from Missouri.

Of course there will be a difference between 91 and 93-100 octane. The R is programmed to run on 98 RON (which some have said falls somewhere in the 93-94 octane range)...so, there ARE improvements to be found between 91 and 93. I never questioned that.

Anyway...none of this really matters, because whether you're running 87 or jet fuel, the heat really soaks the power out of cars in the summer....and the only thing that will help us with any real degree of significance is a good FMIC or, perhaps, a nice Sub-Zero.


-Eric
 

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Eric-

you're probably right about 91 vs. 93+ compared to 93-94 vs. 100 octane.

I've tried running pure 100 octane a few times....and I can't honestly say I can tell it's faster than just my homemade 91/100 mix that yields 93-94 octane.

there are too many other variables that affect the butt dyno.like the outside temps, full tank/empty tank, solo or passengers in car - weight can make a difference.....

if there is a benefit to pure 100 over 93....it's probably not worth the substantial increase in cost to run 100 octane when it costs almost $6/gallon.

bang for the buck, 4-5 gallons of 100 octane mixed with 91 is ideal. no matter what temp it is outside - good gas is like roids for these cars.
 

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Re: (23109VC)

Quote, originally posted by 23109VC »
as premium gets more expensive, buying race gas just makes more and more sense....

Agreed but around here, all of the race gas (e.g. Sunoco GT-100) I've found is available only in drums and not at the pump. Now, if someone knew somewhere in Fairfield County, CT or Westchester County, NY that I could drive to and find race gas at the pump, I would gladly make the trip each and every time
Not that I'm lazy but I did the jerry-can thing once and it simply wasn't worth the hassle (IMHO).

Regards,

Derek
 

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Discussion Starter · #17 ·
Re: (bb vign)

Derek,

You can get Sunoco 260 GT100 "Race Fuel" at any of the following stations in CT:

Cromwell Auto Service
115 Berlin Rd
Cromwell, CT 06516
(860) 636-1917

RPM
80 South St
Danbury, CT 06810
(203) 748-7811

Dan's Garage
115 Roosevelt Dr
Derby, CT 06418
(203) 734-2457

Glastonbury Sunoco
2750 Main St
Glastonbury, CT 06033
(860) 633-2632

Dez's Mobil Mart
750 Straits Turnpike
Middlebury, CT 06762
(203) 598-3299

Monroe Turnpike Service Center
396 Monroe Turnpike
Monroe, CT 06468
(203) 261-6782

Ferry Blvd Sunoco
734 Ferry Blvd
Stratford, CT 06614
(203) 377-4753

Berkshire Store
103 Cemetary Hill Rd
West Cornwall, CT 06796
(860) 672-3663

-Eric

P.S. Still haven't had a chance to get the damn stuff installed on my car.
 

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Re: (Sue Esponte)

Quote, originally posted by Sue Esponte »
Derek,

You can get Sunoco 260 GT100 "Race Fuel" at any of the following stations in CT:

Cromwell Auto Service
115 Berlin Rd
Cromwell, CT 06516
(860) 636-1917

RPM
80 South St
Danbury, CT 06810
(203) 748-7811

Dan's Garage
115 Roosevelt Dr
Derby, CT 06418
(203) 734-2457

Glastonbury Sunoco
2750 Main St
Glastonbury, CT 06033
(860) 633-2632

Dez's Mobil Mart
750 Straits Turnpike
Middlebury, CT 06762
(203) 598-3299

Monroe Turnpike Service Center
396 Monroe Turnpike
Monroe, CT 06468
(203) 261-6782

Ferry Blvd Sunoco
734 Ferry Blvd
Stratford, CT 06614
(203) 377-4753

Berkshire Store
103 Cemetary Hill Rd
West Cornwall, CT 06796
(860) 672-3663

-Eric

P.S. Still haven't had a chance to get the damn stuff installed on my car.

True but I've stopped-by a couple of these places and they only carry race gas in drums http://********************/smile/emthdown.gif
Eric - of those on the list, are you aware if any of the shops have it at the pump?

Regards,

Derek
 
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