Hello guys,

i hope i am not opening up a topic what already has been talked about, if so please send that. I tried to find it but couldnt.

So i have a 260, '74. But i am converting from a flat top carbs to round top carbs. Because i dont want the egr system.
can i just remove the EGR relay? since the egr system is gone. i tried to track down the wiring and i found out yellow goes to the temp switch, Black and white to the ignition and lasty the green red to throttle opener solonoid.
So my thougt is i track down those wires and delete them. Is this a good plan or no?
thank you for your help already.

i also put a photo of my car here. This was how i got it. the paint is awful on it. on the photo it looks good but it has been dan with a paint brush. so you can imagine how it looks. i will bring it to the paintshop and make it the factory green again. because on the fire wall in th engine bay you can also see that is was green before. I just love that color.

kind regards,

Is your 260Z a manual, or an automatic transmission?

On the manual cars, the EGR relay only controls the EGR system. But on the automatic trans cars, the EGR relay also controls the ignition timing by switching the ignition module to use either the retarded and advanced pickups from the distributor.

So, if your car is a manual, then yes... The only implication of removing the relay (and it's associated wiring) is to the EGR system. But if your car is an automatic (or came from the factory originally as an automatic), then there will be implications to the ignition system as well.

On 4/19/2025 at 3:01 PM, Captain Obvious said:

Is your 260Z a manual, or an automatic transmission?

On the manual cars, the EGR relay only controls the EGR system. But on the automatic trans cars, the EGR relay also controls the ignition timing by switching the ignition module to use either the retarded and advanced pickups from the distributor.

So, if your car is a manual, then yes... The only implication of removing the relay (and it's associated wiring) is to the EGR system. But if your car is an automatic (or came from the factory originally as an automatic), then there will be implications to the ignition system as well.

Thanks alot! It is a manual. I have been searching alot and this is very helpful.

Glad to help.

So, are you planning to change over to the round-top style balance tube and throttle linkage shepherds hook? Or are you thinking you'll keep your flat-top balance tube and just cap off the EGR valve?

Either way, don't forget that you'll need the round-top throttle linkage that goes between the two carbs. The flat-top and round-top designs are different and not interchangable.

6 hours ago, Captain Obvious said:

Glad to help.

So, are you planning to change over to the round-top style balance tube and throttle linkage shepherds hook? Or are you thinking you'll keep your flat-top balance tube and just cap off the EGR valve?

Either way, don't forget that you'll need the round-top throttle linkage that goes between the two carbs. The flat-top and round-top designs are different and not interchangable.

I am still thinking what to do about that indeed. Also the gas return spring on the flat tops is located on the carbs ofcourse. But atm i am planning to use the balancetube from the round top. Because it is been made almost to factory state. But then i have to find a new throtle linkage.

I am also blocking off the coolant through the carbs. And then i but a sensor in the waterhousing. So that i can but electrical fans. Hoping it cools alot better. My old radiator was broken so bought that one also new.