"jerky" engine perf in certain specific conditions

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#11

04-13-2011 | 04:22 PM

schwingding

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Quote:

Originally Posted by TSD1959

I had the same problem when I installed the Bub 2into1 pipe on mine. It flowed the exhaust too freely and stumbled and popped in first gear.

Without the baffels, your exhaust is too free flowing. Sportster engines need a small amount of back pressure, or you will get a stumble when first accelerating, at about 2500 rpm's or so. Install an eyebolt and washer in the end of the muffler, and I'll bet your problem will be solved.

Do a search for "lollipop", there are several threads about it. About a $3.00 mod., so if that doesn't cure it, you're not out much $$. Easy and quick to install, so try that first.

Thanks!

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#12

04-13-2011 | 04:33 PM

Blackcherry Low

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From: Minnesota

Quote:

Originally Posted by chevy94ss

Maybe put the baffles back in???

Quote:

Originally Posted by schwingding

Well that's obviously a good diagnostic, but I want to leave them out.

I think chevy is right, put the baffles back in to confirm whether they are the root of the problem or not before you go and spend money on a cable and software. Then take them back out if you like, it doesn't take much time and effort to confirm that.

It does take some time and learning to operate a SERT however, but it is a very good tuner. I had one and had it converted to TTS MasterTune which has some even better features than the original SERT.

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#13

04-14-2011 | 01:05 PM

schwingding

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Well, as we all knew, putting the baffles in corrected the performance issue. I may try the lollipop solution as well as I really did like the additional decibels. Both solutions are going to be easier than trying to figure out that SERT.

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#14

04-14-2011 | 01:52 PM

Blackcherry Low

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From: Minnesota

Quote:

Originally Posted by schwingding

Well me and chevy didn't know otherwise we wouldn't have suggested it. Yeah, it was easy right?

Now go read up on the SERT, get the cable for 30 bucks and you can download the software for free. Then fix your AFR problem.

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#15

04-14-2011 | 02:04 PM

schwingding

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Quote:

Originally Posted by Blackcherry Low

Thanks. i still plan on learning the SERT, where can I get the software? The stealer said he'd give me a cable as he has lots of them lying around, but didn't offer the same for the software.

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#16

04-14-2011 | 07:44 PM

Blackcherry Low

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From: Minnesota

Quote:

Originally Posted by schwingding

Thanks. i still plan on learning the SERT, where can I get the software? The stealer said he'd give me a cable as he has lots of them lying around, but didn't offer the same for the software.

Yeah, grab the cable for little to nothing if you can, then try this,
http://www.sendspace.com/file/q7d973

If that does work just google SERT version 4.77 and you should find all kinds of hits for it. You're going to love it.

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