sloppy acceleration
05-01-02, 02:04 PM
#1
sloppy acceleration
my car has a hell of a midrange but not much 5.5-6ish and up. it also seems gear dependent. 1 and 2 have the problem but 3 doesn't seem near as bad.
another problem is that the car's power seems to be flat with the pedal anything but floored. then once floored it takes a second and boom, starts hauling ***. so going up a hill is all or creeping, same for passing. its a little annoying since i like precision in my controls.
i have my regulator at 4.5, going to knock it down to 4 and see if that helps the stock nikki.
another problem is that the car's power seems to be flat with the pedal anything but floored. then once floored it takes a second and boom, starts hauling ***. so going up a hill is all or creeping, same for passing. its a little annoying since i like precision in my controls.
i have my regulator at 4.5, going to knock it down to 4 and see if that helps the stock nikki.
05-01-02, 02:15 PM
#3
not really bogged, it just does that before it warms up good. its flat. like pushing in the pedal a bit and getting a geo metro increase in hp, then getting pissed because you're still not going anywhere, slamming your foot down and bam, power. sort of all or nothing.
05-01-02, 02:20 PM
#4
Sounds like a carb problem - which I know Jack Schitt about.
Seems like either the accelerator pump needs adjustment, or the pressure which you are working on right now.
But then again, when it comes to carbs, all I know is Jack Schitt
Seems like either the accelerator pump needs adjustment, or the pressure which you are working on right now.
But then again, when it comes to carbs, all I know is Jack Schitt
05-01-02, 02:49 PM
#6
not really bogged, it just does that before it warms up good.
~T.J.
05-01-02, 03:00 PM
#7
if you notice your car idles higher when cold with the choke out. it is meant to do that. mine doesn't since i haven't linked the carb's choke up correctly so i have to sit there and hold the gas in. its not like i'm racing down the street at wot. and even after the choke auto retracts it will bog some and backfire louder until it really warms up.
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05-01-02, 03:23 PM
#9
if you notice your car idles higher when cold with the choke out. it is meant to do that.
.
the car's power seems to be flat with the pedal anything but floored. then once floored it takes a second and boom, starts hauling ***
slamming your foot down and bam, power
.~T.J.
05-01-02, 04:13 PM
#11
Re: sloppy acceleration
Originally posted by jeremy
i have my regulator at 4.5, going to knock it down to 4 and see if that helps the stock nikki.
i have my regulator at 4.5, going to knock it down to 4 and see if that helps the stock nikki.
05-01-02, 07:16 PM
#13
Nikki-Modder Rex-Rodder
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Originally posted by Directfreak
Sounds like a carb problem - which I know Jack Schitt about.
Seems like either the accelerator pump needs adjustment, or the pressure which you are working on right now.
But then again, when it comes to carbs, all I know is Jack Schitt
Sounds like a carb problem - which I know Jack Schitt about.
Seems like either the accelerator pump needs adjustment, or the pressure which you are working on right now.
But then again, when it comes to carbs, all I know is Jack Schitt
jeremy-
Your 1 and 2 gears are so fulla torque, that the engine is not under significant load to create the necessary vaccum to pull your secondaries open. When you hit third, you're under a bit of load with a shorter gear ratio, and you're probably fighting some wind, too. So your engine creates a bit more vacuum, pulls open yer seconds.
Now...
You could be suffering from any or a combo of any one of the following:
The seconds are just plain sticking.
The linkage is just plain sticky.
The vacuum diaphragm is torn, or not sealed well, creating a leak.
There is a gasket leak between the throttle body and carb housing where the vacuum signal-to-diaphragm circiut is.
Your accellerator pump is out of tune, and you're getting poor pump shot.
All or any of these things, combined with the simple fact that you did'nt convert your secondaries to mechanical operation, and increase the capacity and stroke of your accelerator pump per my instructions in the write-up entitled, "Carb Crap...Nikki Mods", written by yours truely and found in the 'Archive" section of this forum, spells...
DISASTER!
(I really do think you'll be pleased with the results; especially because you used the key word "Precision". I like that.)
The first-second thing will stay that way (not nearly as bad if correctly tuned) if you stay vacuum secs, but will disappear if you go to mechanical. Go ultra heavy on a replacement spring for the throttle, and you'll be able to feel when the seconds are being opened thru the pedal (and yer ***, too!). It's cool. YOU decide when the secondaries come on!
You will quickly outgrow your stock Nikki, and need it modified.
Check into Paul Yaws site.
05-02-02, 07:39 AM
#15
Nikki-Modder Rex-Rodder
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Do that, But carb cleaner the linkage and throats of the secondaries, too.
I still think that he's screwed around with his accelerator pump, and it is not tuned correctly.
Of course there is the possibily of **** at the bottom of his float bowls.
I still think that he's screwed around with his accelerator pump, and it is not tuned correctly.
Of course there is the possibily of **** at the bottom of his float bowls.
05-02-02, 11:47 AM
#18
Rotary Freak
Originally posted by jeremy
vacuum problem sounds about right. i'll look into carb mods later. i need a quick fix for the autox this weekend be it i can get the gas tank clean enough to stop dropping rust chunks into the filters.
vacuum problem sounds about right. i'll look into carb mods later. i need a quick fix for the autox this weekend be it i can get the gas tank clean enough to stop dropping rust chunks into the filters.
the spring trick is a quick fix,
four screws,
unscrew,
put them back in,
done
there the ones i showed you on the side of the carb,
it takes all of 5 minutes to do
another thing i just remembered is you atf'd your car with the stock cats !!!!
that just hit me this morning,
man those things are probably toast now.
maybe we should throw up some flex pipe in their place,
i will have plenty left over when i get my exhaust done,
maybe mike p has a mig welder
he forgot mines a 79. no cats, just the thermal detonator avenger reactor thingy.
05-08-02, 10:11 PM
#21
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I have the same problem with acceleration. Someone told me its the 4 barrel card opening only 2 not 4 untill a certain speed. If someone could please tell me how to fix this problem I;d be soo happy......Or maybe I should just get a new carb? Whats A good carb? Holley, Weber or RacingBeat?
05-09-02, 07:55 AM
#22
Nikki-Modder Rex-Rodder
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Go to the archives and find my write-up. It tells how things work, and why they sometimes don't, and what you can do about them.
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