91 na air pump removal
#1
Rotary Freak
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91 na air pump removal
so, i just read on a post of emissions removal, and something of it troubled me...about 6 months ago i took teh air pump off my s5 na because while driving somehow i managed to snap the bracket (on the front of the motor) in half so belts were spinning and the air pump was literally just sitting there. so i took it out and plugged the line. i have a n1 apexi exhaust, rb header and aero highflow car for my exhaust...now what i read was taht taking the pump off can clog your cat = that would suck and that taking the pump of a s4 doesnt do anything but off an s5 will not open 5th and 6th ports? so basically for the last 6 months i have been cloggin my cat, and losing out on some hp? and making my motor work harder than it should be..can some one clear this up for me. i actually have my car chillin at my parents house while i replace the oil cooler lines and ps lines, so now would be a good time to slap that air pump back on . thanks!
#2
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No.. you pretty much nailed it. Yeah, put it back on if you have cats and want more power.
Or, you can do a search for "electronic vdi" and see how to electronically actuate your 5/6 ports and VDI. Then you could remove your cats and live without your air pump.
But the easy solution is put the air pump back on.
Or, you can do a search for "electronic vdi" and see how to electronically actuate your 5/6 ports and VDI. Then you could remove your cats and live without your air pump.
But the easy solution is put the air pump back on.
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dont the 5th and 6th ports only acuate at high rpm? ill check out the electronic vdi for the eff of it. i dont want to remove cats its my daily driver and here if you get caught without cats 2400 dollar ticket. and my car already....is...LOOOUUUD. you can here me 2 miles away ive heard :P thanks for the reply ^^
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ok so went to work on the car today and new update :P the line that goes to the cat WAS drilled out and welded in the new exhaust. HOWEVER the shop that did it welded the line in after the cat...so i need to get it cut and drilled in the new cat. may be a dumb question but popped in my head today, to get the pressure to open the 5th/6th ports does it need to be in cats or just exhaust in general. im gonna do it anyway cuz i dont want to pay for a new cat down teh road, but im always thinkin :P
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#9
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You've got a TII though! No aux ports!
#12
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O.K. Once again to clarify...
- all factory 86-91 NA's have the 6PI system (6 port induction), turbo's do not
- 86-88 use exhaust back pressure from the split air pipe on the cat
- 89-91 use air pump pressure controlled via a solenoid
- 6PI system activates around 3800RPM
- VDI is only on 89-91 NA's and is a system where the intake runner length is changed after around 5700-5800 RPM's
- VDI does not use Air Pump pressure
I'd get an Air pump bracket quickly and put the air pump back on. Sure, I don't like the space it takes up, but overall in your case you want it on.
- all factory 86-91 NA's have the 6PI system (6 port induction), turbo's do not
- 86-88 use exhaust back pressure from the split air pipe on the cat
- 89-91 use air pump pressure controlled via a solenoid
- 6PI system activates around 3800RPM
- VDI is only on 89-91 NA's and is a system where the intake runner length is changed after around 5700-5800 RPM's
- VDI does not use Air Pump pressure
I'd get an Air pump bracket quickly and put the air pump back on. Sure, I don't like the space it takes up, but overall in your case you want it on.
#13
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right i posted another post, that hasnt been replied to other than by me :P i gota bracket to put on, however the bolt that goes to the adjuster arm thing, the part that connects to the block, cant find a bolt that fits it, my question was, is it a bolt that threads in i cant see threads, but i cant get my head down there either lol, or do i need a bolt and throw a nut on the end of it. thanks santos appreciate the comment
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my 88' n/a has had the cat removed, and i just bought an 86 n/a parts car with the same style exhaust system...both no cat's. now i was told the thin pipe running almost to the Y-pipe controlled my 5th and 6th ports. now would my 2 dynomax oval style mufflers be giving me enough back pressure to even open them?? im curious
#15
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Meximan: checked the FSM, if it's the bolt that has a bracket for the OMP, yes the right bolt should find some threads there (looks like it bolts to the water pump. Keep in mind I have an S4 myself.
Jarome: I have the same cat-back system with cat and the rest of the system is stock. My ports aren't opening. Test it yourself. Put some grease on the rods, go for a drive, and see if the rods moved. Search under "actuators" - I've seen great posts on this and electric actuation.
Jarome: I have the same cat-back system with cat and the rest of the system is stock. My ports aren't opening. Test it yourself. Put some grease on the rods, go for a drive, and see if the rods moved. Search under "actuators" - I've seen great posts on this and electric actuation.
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I think the air pump only delivers extra air to the cat during warm up.
Electric pumps can be wired up to do that, the aux ports & the VDI.
Vette's have been using electric air pumps for years.
Last edited by SureShot; 06-06-07 at 02:32 PM.
#17
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i think that was it. heres a picture of what im talkin about, this is a turbo motor though. but same bracket close to the same spot. im gonna work on it tommaro so tryin to figure it out tonite lol.
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