Okay, I seem to recall way back when that one might need to restrict the tubing for the MAP if they started to experience a problem.
I don't recall the details around that.
What is happening with me, is at higher RPMs, my MAP reading is pulsing quite heavily.
I lowered my MAP sample rate and I set my acceleration to be 100% TPS (MAP was causing constant accel decel).
MSII 2.886 on a 2.5L 4 cyl with single TB and MultiPort injection. MAP tube attached midway down one of the runners on the intake manifold.
(Maybe I need to simply move this to the TB?)
Should I just keep lowering the sample rate? Was there something to the restriction of the MAP tube?
Thanks!!!
-Nick
MAP Input Pulsing / Need to restrict?
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
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MAP Input Pulsing / Need to restrict?
Squirtin' Flat-Fender
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66fb
Re: MAP Input Pulsing / Need to restrict?
Nick, I think you have it right. Move the MAP sense point to a central point that is larger in volume and common to each cylinder, if you have that option. I'd avoid anywhere near the throttle body if I could.
Re: MAP Input Pulsing / Need to restrict?
Oops, wrong tubes (Vac gauge and MAP have the same hoses). Maybe that is the problem. My MAP connects just below the TB. I have about 6 ports just below the TB and only 1 midway down the runner. I'll try swapping the vac gauge and the MAP. Thanks!
P.S. Anyone recall adding a restriction to the MAP tube? Or is my memory failing me? I might have some old instructions that I had printed out when I built my MSII, but I was under the impression that at one time they might have suggested adding a restriction (possibly to prevent the problem I was having)...
P.S. Anyone recall adding a restriction to the MAP tube? Or is my memory failing me? I might have some old instructions that I had printed out when I built my MSII, but I was under the impression that at one time they might have suggested adding a restriction (possibly to prevent the problem I was having)...
Squirtin' Flat-Fender
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66fb
Re: MAP Input Pulsing / Need to restrict?
MB_Custom wrote:P.S. Anyone recall adding a restriction to the MAP tube? Or is my memory failing me? I might have some old instructions that I had printed out when I built my MSII, but I was under the impression that at one time they might have suggested adding a restriction (possibly to prevent the problem I was having)...
The search function is your friend...MegaScott wrote:You have your map hose from the throttle bodies, then in the end of the hose you put an 0.030 or smaller MIG tip, then a Briggs&Stratton fuel filter to your MAP sensor. The MiG tip slows down the signal through the filter which acts like a reservoir to smooth out the Map pulses some.