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Old 08-30-2013, 12:17 AM   #1 (permalink)
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2013 Srt 8 acceleration sag

Anyone have any trouble with an acceleration sag/delay? I was attempting to pass a semi as we both left a stop sign at about 35 mph, I got in the left lane and hit the gas and it lost power until I let off and pumped the throttle slightly and hit it again and then it accelerated quickly like it should have the first time. I did only have about 1/8 tank of gas I took it into town filled the tank and again jammed the accelerator down and it seemed to have the lag and it was making a deep intake sound like the old 4bbl carbs did. I switched the setting to "track" and tried it again. If I was above 25 MPH it would lag if under 25 MPH it would burn rubber on the roll and get right with it. A very moody car sometimes. The temp was around 87 today with high humidity but the car had never done that before even in higher outside temperatures. Any thoughts?

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Old 08-30-2013, 08:45 AM   #2 (permalink)
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It's an automatic, is my suggestion. I just purchased mine and when I press the gas pedal hard it delays about 1-2secs then takes off.
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Old 08-30-2013, 09:36 AM   #3 (permalink)
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It's an automatic, is my suggestion. I just purchased mine and when I press the gas pedal hard it delays about 1-2 secs then takes off.
I would agree on that other than I had the G-force meter on and I noticed G force went to the front of the car when I started passing the semi truck during the lag period it was for about 4 seconds at a guess..more like it starved for fuel or backed timing way down
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Old 08-30-2013, 10:30 AM   #4 (permalink)
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I'm surprised that so many of you are experiencing this problem. My only thought was some sort of excess air leakage (loose intake hose, loose vacuum hose, etc...) is happening but this sounds a bit more problematic.
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Old 08-30-2013, 12:04 PM   #5 (permalink)
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I'm surprised that so many of you are experiencing this problem. My only thought was some sort of excess air leakage (loose intake hose, loose vacuum hose, etc...) is happening but this sounds a bit more problematic.
I just did a visual inspection after you mentioned that and everything is tight I was wondering if being at 1/8th tank it may have temporarily sloshed to the back of the tank and lost fuel volume and pressure? I am going to take it out on a stroll later today and temps are right around 87F here again, I want to see if it is going to reoccur. I have also been mixing 89 with 93 octane as gas is over $4.00 again I had forgot I was doing that and maybe it retarded the timing way too much?
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Old 08-31-2013, 02:49 PM   #6 (permalink)
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I just did a visual inspection after you mentioned that and everything is tight I was wondering if being at 1/8th tank it may have temporarily sloshed to the back of the tank and lost fuel volume and pressure? I am going to take it out on a stroll later today and temps are right around 87F here again, I want to see if it is going to reoccur. I have also been mixing 89 with 93 octane as gas is over $4.00 again I had forgot I was doing that and maybe it retarded the timing way too much?
The mix of gas could be the issue. That would explain why mine has done it, since I just bought it and it was still using the dealers gas which I'm sure was the cheapest. I'm sure there is a fuse pull of some sort to reset the timing since your car thinks to give less power because of the gas uve used. I'll have to research it to see.
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Old 08-31-2013, 04:47 PM   #7 (permalink)
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Quote:
Originally Posted by SPARTAA View Post
The mix of gas could be the issue. That would explain why mine has done it, since I just bought it and it was still using the dealers gas which I'm sure was the cheapest. I'm sure there is a fuse pull of some sort to reset the timing since your car thinks to give less power because of the gas uve used. I'll have to research it to see.
Well on that note: I put 93 Octane in it and took it out for a run today and it was a totally different story. The temperature was about the same and conditions about the same. No lag, good response in all modes. In fact I surprised a camaro owner and myself none the less he didnt want to play all. So I would say fuel was probably my issue at least not to sure about other people with a similar problem..I just hope it inst an intermittent issue that is gone today and here tomorrow.
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Old 09-04-2013, 03:53 AM   #8 (permalink)
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I would NEVER run anything but 93 octane in my car. You just spent over 50k for a new car and worried about a couple bucks for fuel? Really?
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Old 09-04-2013, 07:44 AM   #9 (permalink)
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Quote:
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I would NEVER run anything but 93 octane in my car. You just spent over 50k for a new car and worried about a couple bucks for fuel? Really?
Absolutely!!!

Never fails to amaze me... $3.60 on an 18 gallon tank at .20c gallon difference... Ditch one Starbucks a week and save your knock sensors from working double time trying save your car from the massive amount of ST an LT knock your creating. Honestly $50k for a car and feeding it like an 89 Civic is bound to have repercussions inspire of what is 'possible'... Glad you got it all sorted out but people please feed your cars right people!

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Old 09-04-2013, 03:36 PM   #10 (permalink)
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Quote:
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I would NEVER run anything but 93 octane in my car. You just spent over 50k for a new car and worried about a couple bucks for fuel? Really?
LOL probably why I have the money to pay it off by this time next year, I am cheap..but if it is going to cause this acceleration sag.. I ain't that cheap anymore
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