I just had a street tune done by Al with his dynoflash. Al is very good and know what he is doing, however he could not make my car get much more power. The reason is bad gasoline .... I filled up last night with Quick Trip 93 octane and that gasoline is not worth a ****. The car was detonating so bad with the stock maps that Al had to detune it slightly to improve the power and smooth the powerband

The gasoline was definitely the problem as we finally added a can of octane booster and immediately the engine quit knocking so badly. I've been buying QT gasoline for years and I always tought that it was a fine product. They guarantee their gas and everything, but I can tell you it's not even close to 93 octane according to the datalogs, knock sensor and A/F ratios we observed. This crappy so-called 93 octane fuel from Quick Trip is a very substandard product. It just cost me hundreds of dollars and lots of frustration and time wasted. I'm very tempted to write them and see if they refund my money for the dynoflash.

Before you think this is an isolated incident, Al experienced the same problem last night with another EVO that had QT gasoline in it. In contrast, the other guys who were running Amoco high test or BP gasoline experienced fantastic results from the dynoflash and none of them experienced the knocking.

Bottom line is: don't put QT gasoline in your EVO if you want safe and powerful performance.....

 

Good post and I never put QT in ANY of my cars, Amaco, or Chevron are the best 2 the worst 2 are QT and Racetrack. Goes to show you get what you pay for. Also ALL this gas was tested about 6 years ago From a person by the name of Charlie at MazCare. BP also used to suck but it's Amaco now.

 

This dyno was on 100% stock car with Chevron 93 filled up off of Chastain Road.

 

Chevron? buy some good name brand gas... Hard to go wrong there unless the idiot filling the tanks puts it in the wrong tank.

 

Where the heck is everyone from the last i hear of racetrack was when i went to school in tx, hehe well I am a mobil fan myself, in the cars that i had owned all of them perform the best with mobil, even the oils i put into the car. I find that the motor runs like a bat at of hell. I love mobil and if it works for formula one then it works for me

 

Sorry to hear about your fuel problems. I noticed when I had my Eclipse that it didn’t run as well on QT and RaceTrack fuels. I have a friend who works in the motor sports industry that I trust very much, and he said QT and RaceTrack should be avoided. He also said that some of the additives that Shell puts into it’s fuel are not that great for high reving engines. He recommended Mobil, Amaco/BP or Chevron.

As a funny, off-topic side note, my friend was part of a team at the Indy 500 and was walking through the garage one day. He looked into one of the garages and saw a guy dumping out Valvoline oil bottles and filling them with Mobil 1. They were partly sponsored by Valvoline, but they wanted to make it to the end of the race. So I guess, people who know, don’t use Valvoline.

Best wishes,
f86sabre

 

Racetrack does not even sell 93 octane gas (they might be better than QT since they don't pretend to sell high test gas). Anyway, for some of you who might not know, Quick Trip has a huge presence in Atlanta. Of course, now I know that their gasoline is not good for my car, but in all fairness, they are not some cheap looking, ghetto convenience stores.
They fooled me because they have a very nice image with big stores, very clean and lots of pumps. Sure, sometimes their gas prices are lower than other brands, but price alone does not guarantee good quality... I've seen higher prices on off-brands lots of times.

Like I said, I'm not purchasing QT gas any more, but the truth is that I thought I was buying 93 octane gasoline, which by definition should work well enough in my car. Obviously, somebody is fudging the numbers because if the fuel was 93 octane as advertised, it would not cause the terrible detonation that I experienced in my car.

I would advise caution to anyone contemplating buying QT gas for a high performance car. I'd guess there are other brands to stay away from, but I don't know exactly which ones are suspect of selling low octane gas labeled as high octane.

 

I think if you stick with Chevron and Amaco you will be okay. Also you can find them anywhere. That is all that I have run in my turbo cars and had no problem. I did test the gas as I said and that is what I found. The techron also is some good stuff that is in the chevron gas. Also I do not like shell too much but it does run good in this car from what I can see. I think we should do dyno's with different gas, say shell, amaco, and QT, I have to say with this much boost gas is a big factor.

 

around here, St Louis, Ive heard quite the opposite; amaco=bad and QT = best. On a side note, amaco here doesn't even sell 93.

O'well, I always use mobile b/c its the most convenient for me

 

Well, it goes to show that one cannot be sure of anything without doing some experimentation.... I got blasted by some folks as being a "cheap ***" for buying QT gasoline. That's of course just a gratuitous insult, I can't imagine what would be the insult if the bad gasoline would have been the St Louis Amoco.
Anyway, we proved very easily that I had bad fuel problems because adding a bottle of octane booster and 4 gal. of Amoco made the knock go away a huge amount. Also, another guy who was tested the night before with QT gasoline had the very same issues.... I'm not buying QT anymore, that's for sure. It is probably fine for economy cars, but not safe for turbo cars or any cars with high compression engines.

 

We run 19+ pounds of boost on a high revving motor. Gas is everything. Also sorry for being a *** to you it just kinda pissed me off you started slamming me because of Dynoflash did your car.

 

According to reviews that have been done 76 and Shell are the 2 best and most consistant fuels for your car. I personally can vouch for it, when in the winter time and everyone else changes their chemical composition to deal with the colder temps it dropps octane ratings. 76 and shell are the only 2 that do not change and will stay consistant.

I am not familiar w QT... I have heard of speedway and racetrack, and I dont know if you know this or not, but their company buys gas from whoever is cheapest (even stations before they change out their tanks) and they mix it all together. That is why their prices are usually cheaper than other stations.

As for chevron... In my wrx tuning experience and even w/ the evos the techron additive they use in their fuel tends to not make the octane rating as stable. Sometimes it can be good, and other times it can be bad. But most professional tuners will advise you to stay away from chevron because of that additive.


Tom

 

That's outrageous, I thought that there was some sort of oversight and regulations governing these types of things. If they just mix and dump just any crap in a tank and label it 93 octane, it can really make a mess out of an engine. I would think mislabeling in that scale is pretty much criminal behavior. I wish somebody would investigate this and if merited, fine these crooks and put a few in prison...

 

I having been using Shell and did not have any probs when Al flashed my stock ecu.

I know all you say to use BP/Amoco but this wrx owner had a problem with it in East Cobb. Just a heads up.

http://forums.nasioc.com/forums/show...hreadid=459688

 

Hey Silver Evo, and all. Sorry, I just read all these posts and wanted to chime in that I was the guy the night before that was having major problems w/QT (Quick Trip). We made our first run without any flashs and it was knocking like crazy all the way through. It was lighting red (meaning it was knocking) the whole way through on a stock car (really bad) and he (Al) figured it was bad gas and told me never to fill there again. Just goes to show you that the next day he had the same problem with the same gas! Anyway, just wanted to back ya up Silver.