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  #41  
Old February 25th, 2015, 04:01 PM
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mark kellgren
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Quote:
Originally Posted by Red90 View Post
Good lord.....

The engine runs the alternator, which sends the signal to the tach. It does not matter what is in the rest of the drivetrain. Low range, high range, engine on a stand. It will still read the same.

The drivetrain has NOTHING to do with the tachometer signal.

Alternator pulley size and number or poles is all that matters.

Yep. I retract everything I said. I was thinking speedo. All tachs read off the alternator.
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  #42  
Old February 25th, 2015, 05:16 PM
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Quote:
Originally Posted by Red90 View Post
Good lord.....

The engine runs the alternator, which sends the signal to the tach. It does not matter what is in the rest of the drivetrain. Low range, high range, engine on a stand. It will still read the same.

The drivetrain has NOTHING to do with the tachometer signal.

Alternator pulley size and number or poles is all that matters.
if the drive train is causing the higher RPMs in the engine -- having a higher rev due to a lower gear ratio -- then the alternator will also be running at a higher RPM, thus sending the signal that there is a higher RPM. Unless the RPM of the alt is not how the reading is measured. I was assuming it was getting it's info from it's own RPM.

I don't know if this helps him solve his issue, though, I was only trying to reword what others were saying.

And I don't disagree with you, I think we are simply looking at it from opposite ends. I could be totally wrong, but someone will have to explain to me how there is some kind of clutch mechanism to keep the alternator at a constant speed, despite what the engine is doing, and that the measurement from the alternator does not come from a measurement of it's own RPM's, which are tied to the engine speed, which is tied to the gear ratio.
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  #43  
Old February 25th, 2015, 06:32 PM
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Lol. Classic misunderstanding of fundamentals thread. Love it.
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  #44  
Old February 25th, 2015, 06:40 PM
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shayne young
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Zack... Put the bigger pulley on it and be done with all this tomfoolery..
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  #45  
Old February 25th, 2015, 06:52 PM
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yes, put the big pulley on and drive it faster since you will have more RPMs to use

Also you swear you have 3.54 diffs in? or maybe 4.11s?
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  #46  
Old February 25th, 2015, 07:07 PM
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Quite simply he needs to verify engine speed is same as tach reading... Everything else is a different problem..
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  #47  
Old February 25th, 2015, 07:12 PM
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I have 4.11s in my d2, if I had 4.11s in the d1 I'd be at 5k at 60!
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  #48  
Old February 25th, 2015, 07:34 PM
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Quote:
Originally Posted by the rover shop View Post
Quite simply he needs to verify engine speed is same as tach reading... Everything else is a different problem..
Which is what I said on the fourth post but everyone cannot resist coming on and confusing the situation.
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  #49  
Old February 25th, 2015, 07:51 PM
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I am glad there a few people on here that knows what they are talking about, that's some funny shit about gear ratios. Don't forget that using helium in ya tyres will change that alt speed, LOL

Get your self a hand held tachometer and be done with it. or if you have a timing light and a another vehicle with petrol engine you can match speeds with each other. should read the other vehicle needs to have a tach fitted
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  #50  
Old February 25th, 2015, 08:11 PM
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Are you sure you don't have 4.10's in the transmission RPM speed sending unit?
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  #51  
Old March 13th, 2015, 05:17 PM
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Originally Posted by Z.G View Post
I know there's a few Disco/RRC tdi conversions on here. I can't figure out why my RPMS are so high.

It's a 300/R380/28D 1.2 box.

Can't tell if it's incorrect alternator signal to the tach or what, but my truck screams at 75 it seems

Anyone else have this issue? According to Ashcroft the RPMs should be quite a bit lower
ZG, I was reminded of this thread this morning...
300tdi+ZF.auto+245/75KM1s
2500-2600rpm @70-72mph
It'd be nice to grab a 5th gear sometimes...
But not *screaming*.
I will say the Tdi is a "buzzy" little motor

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  #52  
Old March 13th, 2015, 05:28 PM
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Have you looked at getting a TDi instrument pack, Jeff?
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  #53  
Old March 13th, 2015, 05:31 PM
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Thanks Jeff, good to know.
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  #54  
Old March 13th, 2015, 05:48 PM
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Quote:
Originally Posted by Jymmiejamz View Post
Have you looked at getting a TDi instrument pack, Jeff?
What is a Tdi instrument pack?


.
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  #55  
Old March 13th, 2015, 05:58 PM
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What is a Tdi instrument pack?


.
The cluster
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  #56  
Old March 13th, 2015, 06:40 PM
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Originally Posted by Nomar View Post
What is a Tdi instrument pack?


.
I assume it would have a different tachometer.
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  #57  
Old March 13th, 2015, 07:30 PM
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I think we had the discussion above that the tach part numbers are the same for V8 and TDI.
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  #58  
Old March 13th, 2015, 07:41 PM
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Quote:
Originally Posted by Jymmiejamz View Post
I assume it would have a different tachometer.
Charlie H. aka the Rover Whisperer told me all the V8 stuff was fine...plug n play.
My rpms seems dead on.
I just dropped in the Tdi and used the existing wiring...alls good.
Now...I did add on a EGT and a PSI guage extra.

Zack, what's yours reading these days?

.
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  #59  
Old March 13th, 2015, 08:11 PM
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I know it reads correctly, but the range would be different. A Tdi cluster would probably only go to 5k or so RPM's.
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  #60  
Old March 13th, 2015, 08:40 PM
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Don't hate the playa...

I just put a dual pod in the coin tray 😊
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