Is There Anything Special About This Manifold? Pics

[slownrusty]

http://cgi.ebay.com/ebaymotors/nissan-datsun-240z-280z-NAPS-JDM-intake-manifold_W0QQitemZ150069509231QQihZ005QQcategoryZ36474QQrdZ1QQcmdZViewItem

 

 

Yasin

[JSM]

I saw that too and was wondering the same thing.

[Cody 82 ZXT]

I've always thought that throttle body would be cool for low speed throttle reponse. I don't know the total area of the blades but, it might be a neat thing to play with.

[greenmonster80]

NAPS....Nissan Anti Pollution System.....Also read Nissan anti performance system...If I remember correctly it has 2 very tiny ass butterlies instead of a standard size throttle body. Very restirctive looking....Never used it so I cannot say scientifically it is restictive but I never heard of anybody keeping it either...

[Tony D]

The cross sectional area of the throttle plates in that manifold is slightly larger than the stock 50mm single butterfly---if it's from an L28. If it's from an L20A, then the size is considerably smaller.

 

The small throttle plate (about the size of a Nickel if it's an L28 model, about the size of a dime if the L20A model...) will give very nice tip-in response and throttle modulation in partia throttle situations below 3500rpm. Basically you will run on the primary plate with a nice high manifold vacuum level at most cruise speeds, the primary plate throttling range is about 3/4 of total throttle pedal travel, the last 1/4 of the throttle pedal travel is when the larger bore plate goes from fully closed to fully open. Nice for passing on the highway.

Also note that this is an odd manifold----in that it used the vacuum idle speed control like the ECCS on the turbos. On the Z-Car Manifolds, this was accomplished by stepper-motor control, and not a vacuum analog signal. Also note that there is no provision for a cold-start valve---the NAPS system was a hybrid cross between EFI and ECCS systems Nissan used here in the USA, they batch fired the injectors for startup, and then used injector pulsewidth for cold start enruchment instead of the single injector.

 

This manifold was form a Cedric, Gloria, or other large car, they did not use this manifold on the Z-Car, only in the larger passenger sedans.

 

Neat to look at, a conversation piece, but not anything performance oriented.

 

They do make nice daily drivers, though, with that littel throttle plate.