Technical Car Bucking At Low Speeds - What's The Deal?

Solution = sidestep clutch while mashing the skinny pedal to the floor.
Dig the Winged Wonder too


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What did you expect when building it.....moms station wagon with an automatic and 2.47 gears?

 

LSA too narrow. Crossram reversion at low RPM.

Don't drive slowly.

 

Sounds like what I call low RPM cam surge. You will notice that on a stick car with anything above 270 advertised duration. It comes from intake reversion with excess overlap at low RPM.

Plus, the cross ram manifold is too open for street manners.

I don't recognize those particular cam specs., but it sounds like it is for 2500-6000 RPM range or so. They sound good, but aren't very friendly and don't have good street manners. Definitely not a parade cam!

Like others have said, stand on it and side step the clutch!

 

Like I said in the OP, he bought it like this

 

I'll bet it's more than just the combination of parts, I'll bet it's the state of tune, and that if he spends an afternoon adjusting the timing and the idle mixture screws he'll get it dialed in and it will smooth out.

 

you really need to learn to drive the car that cam/intake setup is not going to hold steady at anything under 1500-1800 rpm , you're lucky you have a clutch , you'll learn that in slow traffic that you'll use it alot . you can spend all your time & money and it might be a little better , you'll be ahead of the game just learnig what the engine/car wants...BTDT

 

Change the cam.

 

http://www.compperformancegroupstor...C&Product_Code=12-602-8&Category_Code=THMSBC4

Bingo. It's one of those turds.

 

I used to have a Comp dyno program on my old computer and I searched and found that the X-treme Energy (flat tappet) cams make more torque and power than Thumpers and are much more streetable for the RPM range we live in.

I never was impressed with Thumpers.

 

Work on your advance curve spend some time on the carbs. It is never going to be a soccer mom type ride. Drop the hammer at 5 grand spin the tires, grab another gear repeat as needed until she smooths out.

 

What's the rear gear? I went from a 3.56 to a 3.89 in my car and it was a lot better at slower speeds around town. I agree that the Thumpr cams are not known for their street manners. The Comp Cams XE series may be a good change.