Will running a mix of 101racing gas ( unleaded) with 91 octane ( the highest you can get here) help or hinder the trucks performance? I am running a street chip.

 

I heard the compression on these trucks isn't high enough to make a difference in performance.

 

If you are not pinging w/91... Hinder.

 

It pings a little, the gas here is pretty bad alot of the stations only sell 90 octane. So do you guys think the 100 octane will slow me down?

 

Hilander, if you're in in the high lands (high altitude), the altitude will effectively raise your octane rating. So, 90 octane in the mountains will be like 92 at sea level.

 

Techophile,
Yes 5000 feet. I thought so but thanks for confirming. I think the bad gas altitude and extreme 100 degree heat makes it pretty tough.

 

IHMO you should get the chip reburned so it doesn't ping... Pinging will destroy your motor... unless you want to add the race gas, for EVERY single tank of gas.

But to answer your question, adding 101 octane will help your performance because it will stop the pinging. You want to add just enough 101 until the pinging stops... and maybe a little more for safety.

 

Thanks for the info guys. The tuner is going to adjust the chip for free. I just wanted to try some better gas first. It only pings a little bit. I am just putting it down to the gas here in the mid west.

 

Hilander,
Yes putting in the higher octane will increase your performance in your case. Let me explain a huge misconception people have about higher octane fuel, or race fuel. For the sake of explanation, I will use a non computer controlled motor, therefore with no electronic timing advance or retard. Many people believe that putting in 100 octane race fuel in a bone stock vehicle that doesn't have any knocking, makes it perform way better---WRONG! The higher octane fuel does not contain any higher BTU's than a lower octane fuel. Octane is defined as: The ability to resist knock. Realize that in an internal combustion engine, the combustion is not an instantaneous explosion of the gases, but rather a "controlled burn". When you have lower octane fuel, the heat inside the combustion chamber becomes hot enough to begin the ignition of the fuel without the spark plug firing, thus causing knock. So, when someone is running a bone stock motor that was designed to run on a certain octane fuel, and the motor has no knock, then adding a higher octane fuel will not increase performance. However, in the case of modern day vehicles with a closed loop computer system, if the knock sensors detect knock, they will send a signal to the ECU to retard the timing back. This occurs at a very rapid rate and thus, performance is lost due to both knocking and a retarding of your base timing. So, if your vehicle is knocking (which is now induced by your chip with more advanced timing), adding a higher octance fuel will certainly improve your performance. The higher octane will eliminate the knock, therefore the timing will not become retarded and you will the motor will develop its peak performance.

I'm having the same problem as you with the knock, and the only way I can eliminate it is to either run stock, or run a large amount of octane boost. My current JDM chip (which I believe is the hot weather program like yours) knocks, but my original street program chip from JDM did not knock at all. Tell Jim you want the latest street program that he had right before he created his hot weather program. I think that will work for you on 92 octane fuel and no octane boost.

Sorry to have written so damn much.

 

Peter

Under what situations are you getting Ping? Are you running som sort of fresh air system? Could you describe the sounds that you are getting.

Andy

 

Peter,
Hi how are you doing?
Thanks for the information. It makes perfect sense. I just got a little concerned after I added the 101 octane race fuel I ran a couple of G-Tech 0-60mph. Both runs were about 4/10 tenths slower than normal. However the weather here is now like around 100 every day. I guess I will put it down to the heat and thunder shower weather.
That fuel got rid of the very little ping I had. More than the octane booster could do.

Spiro,
Yes the tuner has offerd to re-burn the chip foc. It is just that it works so well up to about 80 degrees (no ping) that I am reluctant to change it. Just wish it would cool down. Not until October though.

High Roller,
I have tried most with the same results. No Sunoco here


[This message has been edited by Hilander (edited 06-23-2001).]

[This message has been edited by Hilander (edited 06-23-2001).]

[This message has been edited by Hilander (edited 06-23-2001).]

 

If it PINGS...get it REPROGRAMMED..its really that simple. Your tuner will work with you on this

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Also try a different gas station because this has happened to me twice now where i got pinging with a chip and went to Sunoco or shell and the pinging went away!Sometimes i wonder if we are really getting a true 93 octane at some gas stations.

 

awhittle,
I've had the knock using the PSP street program and race program, with the PSP cone filter and also using the stock airbox. On the JDM chip, since I ran the 90 MAF I was running the JDM big mouth filter.
I have knock or ping (I don't really know which is which by hearing them), but typically under high load low rpm conditions (3rd gear) and then aggressive change in throttle and then sometimes it does it at wide open throttle condition. I sounds like someones beating my piston tops with a hammer (don't know how else to describe the sound to you).

Spiro,
Well, I guess you or Sal need to reprogram my chip then. I've had a couple of burns from PSP and none of them have been without knocking. I have had zero knock with my first JDM chip, but then I opted for the 90 MAF and consequently had to have my chip reburned for that and I believe I ended up with the "hot weather program", which knocks.
On the PSP street program, I can run knock free if I put a full bottle of NOS octane boost to 1/2 tank of gas. As hot as we run here in Phoenix (100+ for months) and with the crap gas we have (oxygenated 92), I think its tough to run a chip and not have knock in these conditions.

Hilander,
Doin great, hopefully you are doing the same. Been to Lake Pleasent several times in the last few weeks on fishing tournaments.
Glad to hear you resolved the knock issue, but I think to run on pump gas in these temperatures, you can't run the JDM hot weather program. I'm gonna be sending mine back for a reburn as I did not have any knock with JDM's earlier program.