R33 New Bov Driving Problems

[bumble_bee]

hey i just bought replica rs bov, for my '96 r33 skyline, and i put it in last nit at my mates, we drilled new holes onto the stock cross over piping, exactly wer the stock bov goes, and mounted it there with know problems and no leaks!

took for a few runs, adjust the hardness & softness of the new bov.. got it about rit..

so i drove home fine!

the only thing that i noticed was that wen down gear and clutch was all the way in, and i didnt release it, the revs would drop from 1500rpms to bout 100rpms, but didnt stall, and den went back up to normal idle revs, lik 500-600rpms...

PROBLEM:

so i got in my car dis morin, drove to my other mates place, who lives bout 2ks away, and was all fine!

then wen i left i got to bout 2000rpm, and it felt like it was bunny hopping! or sumthing??

MY MODS:

i just got a new (afc)apexi neo fitted and tuned,(at 500rpm/1000rpm my correction is -8%. etc..)

front mount intecooler, splitfire coilpacks, re-gapped .6mm spark-plugs,

turbo-tech boost controller/bleed valve, HKS 3" cat-back exhaust.

IDEAS:

new bov needs to tighten(all the way to hard setting)??

afc correction to lean?needs to be adjusted..???

afm??how often do these r33 afm fail, go fautly??

on the back of the bov's there a vac. line that connects to the intake manifold,

should this pipe be a certain min/max diameter, length? if so how long and thick?

any ideas would help...

[R31Nismoid]

Basic problems with using a ATMO BOV dude.

Either get a tune, or change your driving style.

[bloodsword27]

atmo bov's do that...leaks boost as u start to make it so drives like a b!tch....and revs go nuts wen u pull up at lights. look at ur bosot gauge and tacho and u know wat we mean...climbs n drops..climbs n drops...its tryna compensate for the leak

[bumble_bee]

i just got a tune a day before i put the new bov in..

and driving style?wat u mean? lik change gears before 2000rpm?

[bumble_bee]

but how can this be? it was driving fine..and then yeah it screws up!

so a leak???

wat bout if u connect the plumb-back on the valve..lik stock..??

[DRD-00F]

I'm putting my money on leak, I have had intercooler piping come off many a times, and anytime you try and put any sort of power down, it feels like it's bunny hopping...

Check your piping and schtuff

[bumble_bee]

a leak u reckon? best way to find a leak then????

wat bot:

on the back of the bov's there a vac. line that connects to the intake manifold,

should this pipe be a certain min/max diameter, length? if so how long and thick?

would that make diff?

[The Mafia]

dude, regardless of what anyone says, its the BOV.

Either take it off or get used to it.

Was there any reason to change the stock one in the first place?

[johnbarry88]

so it would have the ahhhh tosser noise on it. Definately the bov either go back to stock or plumb in back.

[bumble_bee]

ah ok..thanks dis after noon, after work, ill tightin the new bov,(to a hard setting) and c if that makes any dif..

plus i'll look for vac. leaks..

thanks

[mad082]

if it is doing it when you accelerate then you have a problem that. whether the bov is atmo or not shouldn't make a difference during acceleration, unless the bov isn't closing properly.

now the bunny hoping you are talking about, is it bad like a leaner driver, or is it more of a missifre? the fact that you are running 0.6mm gap plugs with splitfire coils worries me. do you have to run the gap that small to have it not missfire? if you do then you have a serious problem with the splitfires.

[bumble_bee]

yeah, it happen wen i accelerate, and was only in first, and yeah, hit just over 2000rpm and yeah..started hoping!

i think i put it in second and it did it aswell round the same rpm..

now wat u mean by..

"bad like a leaner driver"

well my plugs + coilpacks r fine

and its similar to misfire..but feel liks no fuel..

fuel pump? afm?

i have no clue ay..

[mad082]

what i meant by the leaner driver thing was, is it like putting you foot on the gas then lifting off the putting it back on, like how you see leaner drivers bunny hoping away from an intersection.

[bumble_bee]

sorry, cant remember, it was early dis morin wen it happin..and i didnt have time to have a good look..

i tried turning down the valve to make it harder..but no good..

mit turn it all the way down..

but as for driving im pretty sure i was and had my foot down lik a normal driver, dont think my foot-slip or i was back-off or anythin..

i was just driving...lol

[DRD-00F]

for all those other people still confused:

LeaRner

[bumble_bee]

Yeah, wen i put my foot done it didnt pass 2 to 2.5k as i mention earlier..

it struggled for some reason..

but i did find my problem..

something 2 do with my apexi afc/neo!!!!!!!!!!!!!!!!!!

so i reset it and it drove fine..

well....it uses more fuel now..lol

so i adjusted the air-map myself just on low throttle. and seems to be if not better than before!

the first place i got my tune done, and the at the same time got my apexi NEO fitted..

they didnt change/adjust the DEC AIR or the THROTTLE %..

so i really just changed those..

and my low-throttle from 1,2,,4,5,6,7 and i curved the map..

at 3000rpm i left it 0%(so no changes) coz that wen boost kicks in..well round der..lol

and i dont want to lean it out der.

so i gota get a re-tune and coz it using a bit of fuel..

but has anyone got AIR MAP details?

im gona start-up another topic to c wat people setting ther afc air map set at...

Edited October 19, 2007 by bumble_bee

[bumble_bee]

so.. i took ma car to speedworks in perth, they re-tuned ma afc..

it was oxygen sensor that was playin up!!

so they dis-connected it..and did the tune wit out it

doesnt stall at all anymore! and drives beta!!!

just still uses a bit of fuel..

thank god i work for nissan, and ive already got and put in the new o2 sensor..

but my 33 still chug's fuel..

speedwork had a hell different air map settings than ovaboost..

so i wondering, whould tuning an afc with the o2 sensor connected they re-connecting a new, make any difference?

or would u need a re-tune..???

Edited October 24, 2007 by bumble_bee

[Jmaac]

Sounds like your mixtures were out and the cars gone into limp mode to try make it through the rest of the day. Should of got it tuned properly ages ago...

Mate your cars driving crap because of the style of BOV you've got. Excess air is vented to the atmosphere and not back into the engine (i.e. plumbback). The ECU has measured the amount of air coming into the system through the AFM and is ready to control the a/f ratios but as the excess air is simply vented out of the closed loop the ECU has simply lost it and mixtures are all over the place and the ECU is trying to compensate all over the place

[_Ryan_]

bumble_bee, we aren't charging you per character

[bumble_bee]

Sounds like your mixtures were out and the cars gone into limp mode to try make it through the rest of the day. Should of got it tuned properly ages ago...

Mate your cars driving crap because of the style of BOV you've got. Excess air is vented to the atmosphere and not back into the engine (i.e. plumbback). The ECU has measured the amount of air coming into the system through the AFM and is ready to control the a/f ratios but as the excess air is simply vented out of the closed loop the ECU has simply lost it and mixtures are all over the place and the ECU is trying to compensate all over the place

na, my car is fine now since i got the o2 sensor fitted and lowered some of the % of the high throttle air map settings..

all good..i havent had that bunny-hop/learner problem since..

and i get around 400k's outa my 50L tank now,

so yeah..

and i still got the atmo bov connected..and my idle is fine..

i cleaned out the acc and i believe that made a hell of a difference ay...