cruise control antics

Larry Leung larrycleung at
Tue Jan 11 21:24:48 EST 2005

My car HAS a Charlie Spring. And, as I said, I do get 
occasional surges, but it's been so long since I had the
cruise working, I'm going by memory. It definitely wasn't
as smooth as the S-car, but sounds better than the orignal 
poster's problem. I'd agree with Robert though, since the 
Charlie Spring helps ramp up boost faster, I found considerably,
the C-unit probably can't keep up. If you tightened down the 
spring further, it would only exacerbate the problem. 


On Tue, 11 Jan 2005 18:06:24 -0500 (EST), Brett Dikeman
<brett at> wrote:
> > On Tue, 11 Jan 2005 11:54:07 -0500, Nick Lawrence <nick at> wrote:
> >> I was going to ask a similar question....
> >> My '90 200TQA with increased boost, (1.7 bar), changes speed too fast,
> >> then
> >> coasts, (high vacuum) when using cruise in slightly even terrain.
> >> doesn't do
> >> this when boost is near stock. Anyone else experience this?
> Putting a restrictor in the line to the vacuum actuator might do the
> trick, but would probably make it slow to release as well, which does not
> sound very safe.  Sounds like you've got something else going wrong, like
> a wastegate that has been fussed which case cruise control
> problems like yours are a symptom of a different problem, probably.  Who
> knows, might be the linkage binding up- shoot it with some lube like
> Boeshield or white lithium grease and oil the return springs as well.
> The 200q20v has an IA stage III+ chip and will respond faster than a k26
> 10v, but I've never really had problems with cruise control overshooting.
> When it was working properly, it would be...enthusiastic...about getting
> up to speed.  However, once it hit the target speed, it was equally
> abrupt about cutting back power.  Ever seen Spaceballs, ie "ludicrous
> speed"?  Sorta like that.
> It's amazing how "context-sensitive" horsepower is.  Set CC to 65-ish,
> forgot about it, and two hours of highway cruising later at 70, cruise
> control out of sight and out of mind, coast for your exit.  Coming up on a
> tractor trailer taking the same exit as you, suddenly you're not coasting
> anymore.  275-ish HP feels like 400 right about then.
> Brett

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