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914World.com _ 914World Garage _ DECELERATION VALVE

Posted by: 72914S Oct 27 2003, 10:26 AM

After hooking up all the air breather hoses looks like I forgot the decel valve (D jet 2.0) is this needed for proper tuning and running? It is running quite good .

Posted by: Brad Roberts Oct 27 2003, 10:44 AM

Its semi smog related. I hook them up if the customer is used to driving the car with it hooked up. The cars returns to idle a lot slower with it in place and functioning. Some drivers get used to this.

Do you need it ? No.

B

Posted by: 72914S Oct 27 2003, 11:04 AM

Thanks Brad. Just wasn`t sure if it was needed.I just blocked off the barbs on the air breather. Sure wish there were more 914`s around here to compare notes with ; but then I wouldn`t get all the looks drivin around.

Posted by: Brad Roberts Oct 27 2003, 11:07 AM

Lose the cold start injector (small pate). Lose the thermal time switch (mounted to base of plenum near dizzy).

Lose the AAR if you dont mind warming the car up with the gas pedal (or set the idle mixture a tad rich).

Lots of pieces we dont run on the 2.0 production race cars.

B

Posted by: SirAndy Oct 27 2003, 11:47 AM

QUOTE(72914S @ Oct 27 2003, 09:26 AM)

After hooking up all the air breather hoses looks like I forgot the decel valve (D jet 2.0) is this needed for proper tuning and running?

It is running quite good .

engine (throttle) is more responsive without it.
RPMs go down much more rapidly, no "coasting" anymore ....

but, that's what you want in a real sports-car

Andy

Posted by: ChrisReale Oct 27 2003, 12:36 PM

Dude, my Thermo time switch broke on me and the car ran like shit. Really rich. Do you tweek the MPS to compensate for the lack of thermo time switch

Posted by: ArtechnikA Oct 27 2003, 02:19 PM

QUOTE(ChrisReale @ Oct 27 2003, 10:36 AM)

Dude, my Thermo time switch broke on me and the car ran like shit. Really rich. Do you tweek the MPS to compensate for the lack of thermo time switch

the only thing the thermotime switch is supposed to do is limit the amount of time the coldstart valve is permitted to squirt during cranking. even if it failed in such a way as to permit the coldstart even when it wasn't -really- cold - and failed in such a way that the time limit didn't kick in (heater element...) the thing is only supposed to be powered by Terminal 50 (start circuit)...

if any failure of this part affected your normal operation you had something else wrong (too) ...

Posted by: fiid Oct 27 2003, 05:24 PM

What's the best way of plugging the holes in the intake plenum??

Fiid.

Posted by: SirAndy Oct 27 2003, 05:25 PM

QUOTE(fiid @ Oct 27 2003, 04:24 PM)

What's the best way of plugging the holes in the intake plenum??

clamp a hose on it and put a bolt in the other end ...

dunno if it's the best way, but it sure is the easiest and fastest,
Andy