Hi all, Happy new year.

I have just unplugged electronically the air pump and now its not popping and banging each time i let off. My question is this. Can i leave this disconnected long term without any problems or should i stop being lazy and just remove the thing. what effect will this have on the cars performance longevity etc?

Thankyou

 

If your still running the stock cat, it may not live long. There's suggestion that the newer high-flow cats like Bonez don't care if the AP is hooked up or not. I'm about to test that theory myself.
If you're not experiencing any other performance issues on the stock ECU with the AP unplugged, then your probably home free.
Happy New Year to you too.

 

i am running an apexi pfc with full straight through hks exhaust, downpipe, no cats is this ok then, my injectors are running at 90% cycle duty 350 bhp before i disconnected it?

all the best

 

I've had mine disconnected for over a year now with no ill effects. All it's used for after disconnecting is an idler pulley.

 

If you don't have a cat then there is definitely no reason to not pull it out. Though you might get a lumpy idle without it - which can usually be tuned out. However, if you don't see this effect with it unplugged, you will definitely not see it when it is gone.

 

^ agreed

no reason not to get rid of it. just get a shortened pineapple racing or greddy belt to take the place of the old one. plus is semi exposes the turbos

 

Isn't that kinda high? Even assuming AFR are still acceptable, isn't it time for fuel mods at that duty cycle?

 

Yeah good point, my reputable tuner also tells me this, if i change anything he will charge about 600 dollars to mess with the pfc on the rolling road, so as long as its ok at 90% im happy...Its is ok an 90% isnt it...this is an area i have little knowledge of any suggestions?

thanks by the way im getting rid of that air pump, my idling seemed fine.

 

Maybe someone else with chime in, I just got my PFC a short time back, but it sounds like your flirting with danger at that duty cycle level. You might search a little here. $600 sounds like a lot, unless you run lean, detonate and toast a motor and turbos. If you don't have the money for fuel upgrades, you can always turn the boost down. Just a thought.

 

yeah ill have a search now for some info, i may get a few larger injectors but i dont fancy a remap after installing them. cheers

 

You better fancy a remap after getting them (injectors) because 12v @ 1680cc is a whole lot more fuel than 12v @ 550cc...

I know I'm oversimplifying the whole fuel injection, and that we talk about duty cycle, which involves pressure, and duration of the injector opening... but if all else stays the same... (Pressure wise) a 50% Duty Cycle on 1680cc or 1300cc puts out way more fuel than @ 850cc which are the stock secondaries...

So if you change your injector size, bank on a remap, and the reason it's so expensive is because the tuner has to mess with the new transition between when the 550 primaries stop, and the 850 secondaries continue, and avoiding over or under fueling during that transition.

Welcome to the highly dangerous land of rotary tuning.....

 

at this point in the game u mine as well get 1300cc injectors and a supra fuel pump. that way u can up the boost to 15psi plus and make some nice power. its only going to cost u a bit in cash and will yield some very nice power gains. not to mention that you will be safer.

 

So does disconnecting the electical connection to the air pump make it not work addind up to HP gains???

 

Not really. Since the the AP is essentially a free-wheeling pulley 95% of the time, you won't really notice any power gain. I'm doing a rebuild now and it will be removed. The space will be nice. A little less weight I guess, but mostly it's part of an overall emissions delete/vac simplification....but not for power.

 

Welcome to the highly dangerous land of rotary tuning.....[/QUOTE]


How scared should i be? I am scared. What do you think about turning up the boost with 1600s a supra fuel pump and 15psi, this seem even scarier. I do have a good tuner and i trust him but its costly. Hmm summer project i think.