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Old 06-02-2006, 05:52 PM   #1
bskicrash1
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Default acceleration...

i have an automatic 96 sl2... when i push the pedal down all the way ... i notice the car pushes me back in the seat until about 3,500 rpm's then the car slightly hesitates, and then it takes off with even more power than before (lol... no its not shifting gears).... i understand dyno charts and what rpm's the torque and horsepower is at... my question is: Why does the car slightly hesistate at 3.500 rpm ? does anyone else's do this? is this common?

Oh, and the car is in second gear when it does this


Could this be a problem (like with motorcycles and having to rejet them?)

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Old 06-02-2006, 05:58 PM   #2
tex89408
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1996 SL1
Default Re: acceleration...

I have a 96 sl1 and mine does the same thing in second gear sometime during the gear.. it is weird but it not that bad for me.

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Old 06-02-2006, 06:12 PM   #3
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Default Re: acceleration...

Maybe it's the car telling you, "if you do that again, it might just cough and throw up oil all on the ground".

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Old 06-03-2006, 09:00 AM   #4
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Default Re: acceleration...

Quote:
Originally Posted by 10W30
Maybe it's the car telling you, "if you do that again, it might just cough and throw up oil all on the ground".

LOL... wow, between your calvin image and you saying that...i just couldn't hold it back!

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Old 06-03-2006, 10:05 AM   #5
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Default Re: acceleration...

Quote:
Originally Posted by bskicrash1
LOL... wow, between your calvin image and you saying that...i just couldn't hold it back!

Twin Cam Saturns begin to come into their power between 3500 and 4K rpm's. You probably feel the power band beginning.

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Old 06-03-2006, 12:41 PM   #6
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Default Re: acceleration...

My '95 SL2 does the same thing-but I don't think it's the power band beginning because the revs almost seem to drop for a second before it starts accelerating again (this isn't when it's floored-I haven't tried that, just going up a very steep acceleration ramp).

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Old 06-03-2006, 12:54 PM   #7
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Default Re: acceleration...

yeah, my revs drop from 3,500 to 3,100 and it kicks in with power!

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Old 06-03-2006, 12:56 PM   #8
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Default Re: acceleration...

While this idea wouldn't apply in Tex's case, unless he/she has a twin cam engine in their SL1, isn't the hesitation then the other surge of power you all mention coming from the other set of valves coming on-line? I know that under 3,500 rpm, all four valves on the DOHCs open and close but only two of them work, one to let in the air and fuel, mix and burn them and then the other valve to exhaust it. Above that rpm range, the other two valves activate too, hence the extra boost in power. Or am I completely off-base? <shrug> Just a thought...

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Old 06-03-2006, 02:49 PM   #9
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Default Re: acceleration...

Quote:
Originally Posted by Tethys
While this idea wouldn't apply in Tex's case, unless he/she has a twin cam engine in their SL1, isn't the hesitation then the other surge of power you all mention coming from the other set of valves coming on-line? I know that under 3,500 rpm, all four valves on the DOHCs open and close but only two of them work, one to let in the air and fuel, mix and burn them and then the other valve to exhaust it. Above that rpm range, the other two valves activate too, hence the extra boost in power. Or am I completely off-base? <shrug> Just a thought...

Actually, it's just when they make their power. All the valves work all the time, period. S-Series do not have variable valve timing, or any fancy crap like that. Twin Cam's just make their power above 3500rpm's. That's all. These are not Lamborghini's. They're Saturns.

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Old 06-03-2006, 03:18 PM   #10
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Default Re: acceleration...

i have a sc2 and kinda have the same problem, i was told that it could be the valvebody. When i put my car on reverse it doesn't shift for a few seconds and then it goes into reverse whith a kick, when it shift into second it does the same thing. i took it to saturn and they said that the presure is not releasing on time, thats why its doing that.

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Old 06-03-2006, 09:27 PM   #11
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Default Re: acceleration...

Quote:
Originally Posted by sc2trapped
When i put my car on reverse it doesn't shift for a few seconds and then it goes into reverse whith a kick, when it shift into second it does the same thing. i took it to saturn and they said that the presure is not releasing on time, thats why its doing that.
That sounds like the very common "reverse slam" problem-look up wolfman's reverse slam fix procedure in the how-to library; it outlines a very simple cure for the problem.

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Old 06-03-2006, 09:32 PM   #12
tex89408
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Default Re: acceleration...

on my sl1 sohc it goes 4.2K then drops to 4K then goes up again

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