lostsoul Posted December 27, 2016 Report Share Posted December 27, 2016 Does a sweep when the key is turned on but no rpm showing when the engine is running ... the ECU show rpm.What should I start looking at ? Quote Link to comment Share on other sites More sharing options...
Adamw Posted December 27, 2016 Report Share Posted December 27, 2016 What model is the car & tacho? Have you tried changing tacho duty cycle already? - if not try it at 25% & 75% to see if that helps. Quote Link to comment Share on other sites More sharing options...
lostsoul Posted December 27, 2016 Author Report Share Posted December 27, 2016 Car is a 92' Nissan 300zx with a std. Tacho. Haven't played with the duty cycle yet, will try what you have suggested .... Thanks Quote Link to comment Share on other sites More sharing options...
Brad Burnett Posted December 27, 2016 Report Share Posted December 27, 2016 If it sweeps with key on then the tacho is wired to the ecu correctly and the ecu is in control. Shoud try as adamw has mentioned and try adjusting the duty cycle and the multiplier. I have had to mess with those in order to get those tachos to work.Does the key on sweep go all the way to the set RPM value? Quote Link to comment Share on other sites More sharing options...
lostsoul Posted December 27, 2016 Author Report Share Posted December 27, 2016 The sweep actually goes past the set value. Quote Link to comment Share on other sites More sharing options...
Simon Posted December 27, 2016 Report Share Posted December 27, 2016 Check that there is only one output assigned as Tacho and that you have a suitable multiplier typically 1 Quote Link to comment Share on other sites More sharing options...
lostsoul Posted December 28, 2016 Author Report Share Posted December 28, 2016 I have AUX 4 assigned to "Tacho" plus there is a Tacho control at the bottom of the AUX Output section. Quote Link to comment Share on other sites More sharing options...
Simon Posted December 28, 2016 Report Share Posted December 28, 2016 The Tacho control is where all the settings are configured. You should have much like in the image. Quote Link to comment Share on other sites More sharing options...
lostsoul Posted December 28, 2016 Author Report Share Posted December 28, 2016 Yes, that is what I have except the sweep rpm is set to 8000 rpm. Quote Link to comment Share on other sites More sharing options...
Simon Posted December 28, 2016 Report Share Posted December 28, 2016 You could try adjusting the duty cycle. Also posting your full map might help us track the issue down. Quote Link to comment Share on other sites More sharing options...
lostsoul Posted December 29, 2016 Author Report Share Posted December 29, 2016 Ok, checked a couple things.1: AUX 2 is set as "Tacho"2: Set the sweep rpm to 7000rpm ... sweeps to just past 8000rpm.3: Tried adjusting the Duty Cycle 25% and 75% ... not a peep out of the Tacho.Attached is my pclr. and a log file Nigel's Thunder Install.pclr Log 2016-12-29 4;18;19 pm.llg Quote Link to comment Share on other sites More sharing options...
Simon Posted December 29, 2016 Report Share Posted December 29, 2016 If you set Aux 2 as test PWM and adjust the frequency are you able to make the Tacho operate?On the bench with you map Aux 2 is acting as expected and pulsing with RPM increasing in frequency as RPM increases. Quote Link to comment Share on other sites More sharing options...
lostsoul Posted December 29, 2016 Author Report Share Posted December 29, 2016 Will go it go tonight. Quote Link to comment Share on other sites More sharing options...
lostsoul Posted December 31, 2016 Author Report Share Posted December 31, 2016 (edited) If you set Aux 2 as test PWM and adjust the frequency are you able to make the Tacho operate? Ok, tried that .... nope, nothing, adjusted the frequency down to 30hz and up to 130hz Edited December 31, 2016 by lostsoul Quote Link to comment Share on other sites More sharing options...
lostsoul Posted December 31, 2016 Author Report Share Posted December 31, 2016 Ok, tried that .... nope, nothing, adjusted the frequency down to 30hz and up to 130hz Obviously the only thing left is a wiring issue ... guess what ... yup, you guessed it, had the Speedo Out and Tacho wires swapped around ... ( do I feel like a dump bastard or what !!!! ) Thanks for pointing me in the right direction. Quote Link to comment Share on other sites More sharing options...
Scott Posted January 4, 2017 Report Share Posted January 4, 2017 Good work on tracking down the problem.Scott Quote Link to comment Share on other sites More sharing options...
mkiv Posted January 6, 2017 Report Share Posted January 6, 2017 lostsoul, has your sweep past set value fixed as well ? Quote Link to comment Share on other sites More sharing options...
lostsoul Posted January 6, 2017 Author Report Share Posted January 6, 2017 lostsoul, has your sweep past set value fixed as well ? No, looks to be a couple 100 rpm out still ... most likely a calibration issue ?? Quote Link to comment Share on other sites More sharing options...
mkiv Posted October 1, 2017 Report Share Posted October 1, 2017 No, looks to be a couple 100 rpm out still ... most likely a calibration issue ??mine the same still having 100-250 rpm out issue. i have a blitz meter connected to same signal and it is showing correct rpm as shown in ecu. only stock cluster is not showing correct rpm. i didnt have this issue with v88 before swaping ecu to thunder. Simon or tech people, is there a way to see where the problem lies ?thx Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 1, 2017 Report Share Posted October 1, 2017 If the blitz meter shows correct then it is likely just your oem tacho inaccurate, this is pretty normal. Most production car tachos will have significant error, usually more so at the high end of the scale. Quote Link to comment Share on other sites More sharing options...
mkiv Posted October 1, 2017 Report Share Posted October 1, 2017 If the blitz meter shows correct then it is likely just your oem tacho inaccurate, this is pretty normal. Most production car tachos will have significant error, usually more so at the high end of the scale.totally understand that but the weird part is that if i connect v88 back in no longer have the issue.. ecu calculation problem ? Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 1, 2017 Report Share Posted October 1, 2017 No. Provided the tacho multiplier and duty cycle settings are set the same in both the V88 and G4+ then they will output identical tacho signals. Quote Link to comment Share on other sites More sharing options...
mkiv Posted October 1, 2017 Report Share Posted October 1, 2017 it is unexplainable then in that case ? even the sweep function was spot on in v88, but g4+ will just go past set point no matter what setting .. Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 1, 2017 Report Share Posted October 1, 2017 it is unexplainable then in that case ? If your blitz meter reads correct then surely that confirms the ECU is outputting a correct frequency? but g4+ will just go past set point no matter what setting ..Are you sure the settings make no difference? If you use a smaller multiplier the needle should sweep to a smaller number? Quote Link to comment Share on other sites More sharing options...
mkiv Posted October 1, 2017 Report Share Posted October 1, 2017 If your blitz meter reads correct then surely that confirms the ECU is outputting a correct frequency? Are you sure the settings make no difference? If you use a smaller multiplier the needle should sweep to a smaller number?that is the thing, blitz meter reads exactly like in ecu. having said that the blitz has a setting that i can configure. however it was never reconfigured even after ecu swapped to g4+. the meter is sbc i color spec r. it is boost controller actually. as for multiplier i guess the smallest unit is 1? may be witth updated firmware i get smaller multiplier?, correct me if there is smaller than 1 multiplier available. all i can say after g4+ swapped, sweep never sweep to configured value, but v88 does it fine. just cant get my head around this. may be you can help finding a way to trouble shoot this ? Quote Link to comment Share on other sites More sharing options...
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