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914World.com _ 914World Garage _ L-Jet Brain differences

Posted by: 914nerd Apr 11 2007, 08:15 PM

Some of the experts out there might know
What are the differences between the 74 and 75 brains and are they interchangeable?

Thanks,
Charles

Posted by: ClayPerrine Apr 11 2007, 08:17 PM

QUOTE(914nerd @ Apr 11 2007, 09:15 PM)

Some of the experts out there might know
What are the differences between the 74 and 75 brains and are they interchangeable?

Thanks,
Charles

Part numbers???

I don't think there is much difference. I put a 75 brain on a 74 to test it,and it works fine.

Posted by: Dave_Darling Apr 12 2007, 10:16 AM

The 75 ECU can actually read the intake air temp sensor in the air flow meter. The 74 meter does not have that. Not sure if there are other changes...

--DD

Posted by: ClayPerrine Apr 12 2007, 01:17 PM

QUOTE(Dave_Darling @ Apr 12 2007, 11:16 AM)

The 75 ECU can actually read the intake air temp sensor in the air flow meter. The 74 meter does not have that. Not sure if there are other changes...

--DD

IIRC.. they just separated the leads from the intake air sensor and the afm between 74 and 75 to cure cross signal interference, the brain on the other end was the same.

But I have been known to be wrong.

Posted by: Jeff Bowlsby Apr 12 2007, 04:20 PM

I doubt they could be interchangeable. One has a 6-pin connection, the other has a 7-pin connection.

Posted by: Marty Yeoman Apr 12 2007, 06:56 PM

QUOTE(Jeff Bowlsby @ Apr 12 2007, 03:20 PM)

I doubt they could be interchangeable. One has a 6-pin connection, the other has a 7-pin connection.

They have a lot more pins that 6 or 7.
Maybe your thinking of the air box connector.

Posted by: ClayPerrine Apr 12 2007, 09:11 PM

QUOTE(Jeff Bowlsby @ Apr 12 2007, 05:20 PM)

I doubt they could be interchangeable. One has a 6-pin connection, the other has a 7-pin connection.

Same number of pins at the computer, AFM is different.