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Weird cam issue...

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Old Apr 5, 2010 | 08:15 PM
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Default Weird cam issue...
When I have my car in drive, and i let go of the brake, the car moves like the cam is pushing it. What could it be?!? I have a MS3 cam btw.
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Old Apr 5, 2010 | 08:37 PM
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Well technically your crank is "pushing" your car. I'm confused though. Your not wanting your car to move while in drive and you let off of the brakes?
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Old Apr 5, 2010 | 09:55 PM
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No I want it to move. It's just that it will like "jump" instead of ease forward normally.
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Old Apr 5, 2010 | 10:18 PM
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I'm no transmission specialist, but maybe something to do with your torque converter?! What are your rpm's at with brake applied versus when u let off of the brake? Are your rpm's jumping too? Or is it just the drivetrain?
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Old Apr 5, 2010 | 11:36 PM
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I will check it tomorrow or the next day
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Old Apr 6, 2010 | 01:34 AM
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It's called cam surge. It's typical with cams, especially bigger ones. Tuning should take care of this issue.
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Old Apr 6, 2010 | 01:38 AM
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you need to get that thing tuned!
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Old Apr 6, 2010 | 09:08 AM
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might need to get a bigger stall
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Old Apr 6, 2010 | 10:26 AM
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Can someone explain cam surge. I hbe never experienced this in any cam car I've driven or rode in. although all have been manuals. Is this typical with auto's and cams?
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Old Apr 6, 2010 | 04:25 PM
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Originally Posted by squirts11
It's called cam surge. It's typical with cams, especially bigger ones. Tuning should take care of this issue.
That's what I thought just wanted to make sure. And it is tubed...by G-force.
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Old Apr 7, 2010 | 10:13 AM
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A few things can cause cam surge. One of them is that your idle/partial throttle airflow tables are set wrong. Also you might have a stall too small for your cam. The thing with tunes is that you have to have a street tune. Usually a good tuner will disengage your MAF this helps to set up your idle and partial throttle. He will set the air tables and then after that is done, he will activate the MAF again to tweak your idle and partial throttle air tables, then go on to your WOT tune. This way of tuning will take a lot of the cam surge out if you have the right stall and right size MAF for your application.

Now a good tuner can get your tune spot on with a street tune only. If you decide to do a dyno tune after wards usually that is for tweaking and WOT.

there is way more to tuning than this but this is a quick overview.
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Old Apr 7, 2010 | 03:39 PM
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Yea im gonna get it street tuned for sure...I have a 3200 stall with stock 2.73 gears. Im gonna replace the gears with 3.73 and that should help out..
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