SuzukiSavage.com - acceleration craps out around 73ish

clearush

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Deer Park,TX
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acceleration craps out around 73ish
09/04/12 at 14:42:09

I can push up towards 80 but only on a downhil grade.

2001
Running a cone filter, HD exhaust
adjustable slide needle, from the dyna kit c-clip moved down 1 space from standard
same effect with a standard 150 and 152.5 main jets
Have a 55 idle jet installed also.
1-1/2 turns on the idle adjustment

any ideals?? It seemed I had better top speed running a lean mix and before I "adjusted" the slide needle but my middle acceleration sucked.

Could it be a valve adjustment issue?? Over jetted?? Stupid hot weather??

Thanks

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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28884 L.A. California Gender:	Re: acceleration craps out around 73ish Reply #1 - 09/04/12 at 15:52:41 you should run thru the tuning procedure step by step.
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justin_o_guy2

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What happened?

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East Texas, 1/2 dallas/la.

Re: acceleration craps out around 73ish
Reply #2 - 09/04/12 at 16:16:55

YOuve opened Pandora's Box. By suddenly making a lot of changes w/o evaluating each one, theres no way to know which change did what. Thats okay.,no biggeee, just dont get frustrated, take your time. Write down what youve done so far & note how it is.
Study tuning procedures, keep a log of what ya do & how it responds & work thru it scientifically. At least its serviceable. Have ya checked the MPG? Easy enough to do, fill up, run it 50 miles & go back & fill up again. I like to use the same pump, so its sitting the same, & fill to the same spot.

Just have fun with it,man,, youll learn a lot.

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clearush

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Deer Park,TX
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Re: acceleration craps out around 73ish
Reply #3 - 09/04/12 at 18:51:45

still getting in the 40-43 mpg range depending on how I accelerate from stops.

with the cone filter and hd exhaust and a Dyna kit installed I could peak out around 85ish but that was running lean and hot and turning the pipes purple.

idle was not so good with the 52.5, idle is much better with the 55 @ 1-1/2 turns

at the same time I bumped from a 145 to 150 main jet without changing the needle setting and it seemed to be doing much better but was lacking in the midrange accel. (did not try topping it out during this time)

so I bumped the needle up using the c-clip instead of the spacer mod, this improved midrange throttle response and did well all the way up till the 70ish range where it seems to bog down on the last 1/4" to WOT

there is a spot just before WOT that actually acells better and hold speed better than WOT so I'm not sure what was going on.

Bumped up to 152.5 earlier today and tried the highway and same reponse at WOT just kind've meh.....

Bumped down to 147.5 main and will try again on the 20 mile ride to and from work.

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Charon

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Re: acceleration craps out around 73ish
Reply #4 - 09/04/12 at 18:52:32

In any sort of scientific work, you make one change at a time and record the results. When you change several things at once, all you do is confuse yourself. Put it back to stock, if you can. Record what happens. Then make ONE change and see what happens. You are quite likely to find it runs better, stock, than after your modifications. Sorry 'bout that.

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Eschew obfuscation.

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Boofer Serious Thumper Offline Nearly too old. Posts: 1760 N Ms Gender:	Re: acceleration craps out around 73ish Reply #5 - 09/04/12 at 18:56:43 Shift into fifth gear.
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: acceleration craps out around 73ish Reply #6 - 09/04/12 at 21:26:56 there is a spot just before WOT that actually acells better and hold speed better than WOT so I'm not sure what was going on I think there are guys here who can use that..I wish I could say it is a tool I can use.
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verslagen1

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in it.

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Re: acceleration craps out around 73ish
Reply #7 - 09/04/12 at 21:56:40

clearush wrote on 09/04/12 at 18:51:45:

idle was not so good with the 52.5, idle is much better with the 55 @ 1-1/2 turns

pilot's good.

Quote:

at the same time I bumped from a 145 to 150 main jet without changing the needle setting and it seemed to be doing much better but was lacking in the midrange accel. (did not try topping it out during this time)

so I bumped the needle up using the c-clip instead of the spacer mod, this improved midrange throttle response and did well all the way up till the 70ish range where it seems to bog down on the last 1/4" to WOT

1st mistake, don't adjust the needle till the main jet is right. return it to the original position.

Quote:

there is a spot just before WOT that actually acels better and hold speed better than WOT so I'm not sure what was going on.

this is a clear indication you need a bigger main.
Quote:

Bumped up to 152.5 earlier today and tried the highway and same response at WOT just kind've meh...

return the needle to the original position and try WOT again. back off a smidge if it gets better than you need a bigger main. (thanks JOG for pointing that out)

set the main 1st then the needle.

what you're doing is pulling the needle completely out of the jet causing it to flood.

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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: acceleration craps out around 73ish Reply #8 - 09/04/12 at 22:11:47 I remembered that meant something,, Im just not that good at carb tuning. Odd how memory works,,I know where dang near everything is around here, but, I just cant remember these details.. dangitt..
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clearush Senior Member Offline SuzukiSavage.com Rocks! Posts: 261 Deer Park,TX Gender:	Re: acceleration craps out around 73ish Reply #9 - 09/05/12 at 03:28:56 Thanks guys, I was thinking it was something along that line. I will get the needle reset and then tune the main jet.
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