ZR-1 Net Registry Forums - Did you eliminate your Secondary Throttle Vacuum System?

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- - Did you eliminate your Secondary Throttle Vacuum System? (http://zr1.net/forum/showthread.php?t=28533)

Karl	08-11-2018 03:24 PM

Re: Did you eliminate your Secondary Throttle Vacuum System?

Anyone notice lower fuel mileage after removing the secondaries?

XfireZ51

08-11-2018 03:54 PM

Re: Did you eliminate your Secondary Throttle Vacuum System?

Quote:

Originally Posted by Karl (Post 282495)

Anyone notice lower fuel mileage after removing the secondaries?

Why would fuel mileage change if u have a proper tune?

Karl	08-11-2018 04:17 PM

Re: Did you eliminate your Secondary Throttle Vacuum System?

Quote:

Originally Posted by XfireZ51 (Post 282498)

Why would fuel mileage change if u have a proper tune?

I don't know, that's why I am asking.

I assume all 16 injectors will run all the time versus 8 under normal driving conditions.

GOLDCYLON

08-11-2018 04:30 PM

Re: Did you eliminate your Secondary Throttle Vacuum System?

Quote:

Originally Posted by Karl (Post 282495)

Anyone notice lower fuel mileage after removing the secondaries?

Everyone

Ccmano

08-11-2018 04:51 PM

Re: Did you eliminate your Secondary Throttle Vacuum System?

Hard to tell, my foots always in it. I guess from that perspective mileage is worse because you want to floor it all the time.
H
:cheers:

XfireZ51

08-11-2018 04:59 PM

Re: Did you eliminate your Secondary Throttle Vacuum System?

Quote:

Originally Posted by Karl (Post 282499)

I don't know, that's why I am asking.

I assume all 16 injectors will run all the time versus 8 under normal driving conditions.

Secondaries turn on just off idle. Then they share Pulse width w primaries. Therefore no additional fuel should be used. Unless ur like Hans or GC.

Karl	08-11-2018 05:13 PM

Re: Did you eliminate your Secondary Throttle Vacuum System?

Quote:

Originally Posted by XfireZ51 (Post 282505)

Secondaries turn on just off idle. Then they share Pulse width w primaries. Therefore no additional fuel should be used. Unless ur like Hans or GC.

That make sense, thanks for the info.

Paul Workman

08-12-2018 12:50 AM

Re: Did you eliminate your Secondary Throttle Vacuum System?

@ 70 mph in cruise I got 26.4 mpg (as I recall). That was almost identical to what I got before deleting the secondaries.

.

rkreigh

08-21-2018 01:56 PM

Re: Did you eliminate your Secondary Throttle Vacuum System?

I didn't notice any difference in MPG with them removed

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