Amazing performance after removal of AIV system

[GuSpeed]

After taking the AIV system and plugging up the 4 hoses the car at first no notice difference but later on in the day it ran better. The car revs smoother and seems to have a lot more torque.

[Nismo_Freak]

Cool, sounds like you were getting some reversion of the exhaust gasses into the intake path then.

[GuSpeed]

Any other cheap or free mods I can do to my car to make it perform better or increase power?

[Nismo_Freak]

Without knowing what you you have done already or what you drive it's hard to say.

[GuSpeed]

hehe sorry... my car is a 90 Nissan 240sx stock. I've taking the AIV out, taking the air intake resonator out the box that's under the car. Thats about it

[dak2007]

does taking off the AIV increase hp or help with acceleration cuz i want some cheap ways to make my car accelerate better

[s13sr20chris]

i could help get you back up to stock if your car is messed up. sometimes getting all the way back up to stock hp is a real feat.

[Nismo_Freak]

Timing advance with the distributer... loosen the bolts and turn it clockwise a small amount. Retighten bolts, put in 93 octane, and go romp on it.

[GuSpeed]

How much do you turn it? Don't you need a timing light? What is the stock degree it's at? I don't know much about timing advance and was planning on doing this. WHy do you use 93 octane?

[Kavkazia]

Remove your a/c belt, p/s belt, find cheap eletric fan, remove fan/clutch, and you should notice your car running like champ for about 40 bills.

[GuSpeed]

i live my power steering

[s13sr20chris]

i live my power steering

even cheap speed aint that cheap.

[GuSpeed]

yeah i like my power steering.

[Nismo_Freak]

How much do you turn it? Don't you need a timing light? What is the stock degree it's at? I don't know much about timing advance and was planning on doing this. WHy do you use 93 octane?

Just turn it a small amount like 1 - 2mm

Timing lights aren't necessary but if you can get one then use it

Stock on the KA should be at 20 ATDC

[yozsi]

Just turn it a small amount like 1 - 2mm

Timing lights aren't necessary but if you can get one then use it

Stock on the KA should be at 20 ATDC

umm... no timing should be at 15 +/- 2 deg btdc.

[djkapone1]

removing AIV f*ks up emissions right?

[Biggs2004]

even cheap speed aint that cheap.

You'd be suprised, I've put a total of $150 into the performance of my car, and I now run 98 in the quarter. Mostly because I've built all the crap I needed, the most expensive parts were the .4mm Denso Iridium Plugs, and Taylor 8mm racing wires.

[eddiec]

how does taking the aiv off f*&k the emissions???

[MR2NER]

I believe the AIV recirulates exhaust gases to lessen the levels of CO2 or sumthin. It's like the catalytic converter in the sense that it reduces harmful emissisons, but hampers performance of a car.

[180fan]

yes, the removal/malfunction of your AIV does eff up your emissions. I can attest to that. Basically your cat needs air to do its job. If it doesn't get that air supplied to it from the aiv, it's not going to be able to break down the gasses that fly through there and yes, it will cause a noticable increase in your emissions. It can and will fail you if that part is not there or not working properly. If you do decide to clean it, make sure the reeds don't seperate. If they do, you're screwed and will need reeds to replace them to pass emissions.

[GuSpeed]

Good thing I didn't throw the AIV away

[Kavkazia]

You'd be suprised, I've put a total of $150 into the performance of my car, and I now run 98 in the quarter. Mostly because I've built all the crap I needed, the most expensive parts were the .4mm Denso Iridium Plugs, and Taylor 8mm racing wires.

Can you break it down as what you did to run 98mph in 1/4 mile? That speed should be in low 14's!

Thanks.

[TurboKA37]

umm... no timing should be at 15 +/- 2 deg btdc.

timing should be about 20 degrees BTDC. this is what eveyone has been going by in the KAT forums for awhile

[ricebike]

Originally posted by yozsi umm... no timing should be at 15 +/- 2 deg btdc.

timing should be about 20 degrees BTDC. this is what eveyone has been going by in the KAT forums for awhile.>>>>>>yea for the DOHC motor, GUspeed's got the SOHC engine, so yozsi is rite...

also, after doin' that distributor-mod, using a higher octane gas is highly recommended... or your engine go "bye-bye":the SOHC engines didn't come w/ knock sensors

soo, if u can't afford high-octane gas every time, i'd advised against this.

on another note: "I believe the AIV recirulates exhaust gases to lessen the levels of CO2 or sumthin. It's like the catalytic converter in the sense that it reduces harmful emissisons, but hampers performance of a car." <MR2NER>

misinformation, except for the last part<where's that troll that always get's his panties in a bunch when he see's stuff like this??? hehe, j/k>

it basically adds air into the cat converter to "help" it to complete the byproducts of combustion>water + carbon dioxide -yadda yadda yadda. MR2NER is thinkin' maybe the EGR valve "recirulates exhaust gases"

just a dude who read some old threads awhile back...

180fan, if the reeds fail, couldn't u just keep the AIV hose disconnected from the airbox<so water & exhaust gasses won't be "vomited" back into the intake & screw up the MAF,throttlebody valve, etc> & add a breather filter on it? that way, it's still getting air into the cat <not as much> but better than plugging the line... I just did this d/t the high mileage of my car & want to prevent this problem.

[TurboKA37]

my bad, i didnt kno we were talking about the SOHC KA. thanks for the correction

[zombieman]

i was wondering... if you were to disable the aiv.... then wouldn't that let more unburn gas to go back in the combustion chamber when backpressure kicks in?

[ricebike]

nope, it'll just vent it out the tail pipe...high emissions> fail smog.

but you'll have to find the cause of your unburned gas...weak spark, bad coolant temp sendin unit, old or clogged cat, etc... yadda yadda yadda

[180fan]

ricebikeno, the reeds must be there for the aiv to function. That's the basic of the AIV. The reeds open when there's negative backpressure present. If they're even slightly parted (enough to slip a piece of paper in between), they're not going to function properly. I suppose you could always pull out the reeds, however, you'll get the "bang bang" sound. I've yet to get back to testing on the AIV unit itself, but I'm not going to risk failing smog again so I'm also getting a new cat but need to find someone who's got the 3" flanges I need to weld onto the new cat.

[GuSpeed]

will my car be okay with the AIV out?

[180fan]

it'll be fine for regular driving if it's removed. If you've got an emissions test coming up, you'll need it.