Speed in A9L2 log all over the place

Vehicle specific forum for tuning the Foxbody Chassis Mustangs utilizing the LUX0, GUFA, GUFB, and GUF1 Strategy

Speed in A9L2 log all over the place

Unread postby ragtop50 » Sun Sep 02, 2018 3:08 pm

Is it normal to see the speed all over the place in datalogs using the A9L2, or could I have a sensor issue?
This is using a QH with an A9P in 1990 foxbody.

Speed goes from 122 to 5.5 to 68 to 76 to 34 to 108 (in that sequence, and in less than a second) when I exported my datalog to a spreadsheet.
ragtop50
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Posts: 17
Joined: Fri Dec 15, 2017 1:55 pm
Name: Randy Langdon
Vehicle Information: 1990 Mustang LX Convertible, A9P QH with A9L2 - TunerPro RT
TW170 Heads
Lunati 20350711 Cam (221/229 @.050, .542/.565 lift, 112 LSA)
GT40 Tubular intake with TMOSS ported lower
Tremec 3550 5 speed
3.55 gears (31 spline setup)
9:1 Compression
SD 80 lb injectors
Stock MAF (for now)
Shorty headers (1-5/8), x-pipe with Spin Tech 9000 Mufflers (full exhaust)

Re: Speed in A9L2 log all over the place

Unread postby decipha » Sun Sep 02, 2018 3:30 pm

obviously a speed sensor issue
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decipha
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Re: Speed in A9L2 log all over the place

Unread postby ragtop50 » Sun Sep 02, 2018 6:44 pm

Can that cause any tune issues? Obviously it needs to be fixed, but I take off for Mustang Week on Tuesday but if this could be causing issues I will try to squeeze in fixing it before I go.
What kind of issues could such a problem create?
ragtop50
General Poster
 
Posts: 17
Joined: Fri Dec 15, 2017 1:55 pm
Name: Randy Langdon
Vehicle Information: 1990 Mustang LX Convertible, A9P QH with A9L2 - TunerPro RT
TW170 Heads
Lunati 20350711 Cam (221/229 @.050, .542/.565 lift, 112 LSA)
GT40 Tubular intake with TMOSS ported lower
Tremec 3550 5 speed
3.55 gears (31 spline setup)
9:1 Compression
SD 80 lb injectors
Stock MAF (for now)
Shorty headers (1-5/8), x-pipe with Spin Tech 9000 Mufflers (full exhaust)

Re: Speed in A9L2 log all over the place

Unread postby decipha » Mon Sep 03, 2018 11:19 am

nope wont cause any issues at all so long as it reads something while driving and stays at 0 when stopped its fine as far the ecu is concerned
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decipha
Tooner
 
Posts: 15307
Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Ponthieux
Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce


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