Jump to content
SAU Community

Recommended Posts

was your engine standard if it was u had a fault somewhere in the electrical system mate ive put an rb20t in a silvia and it went through the nsw rta emmision laws with a bov venting to atmo and passed with flying colours my car has been on the dyno with a bov venting to atmo it passes emmision laws

and gijor33 o2 sensors r in use all the time what do u think helps control a.f ratios

  • Replies 44
  • Created
  • Last Reply

Top Posters In This Topic

Originally posted by greygirl1976

was your engine standard if it was u had a fault somewhere in the electrical system mate ive put an rb20t in a silvia and it went through the nsw rta emmision laws with a bov venting to atmo and passed with flying colours my car has been on the dyno with a bov venting to atmo it passes emmision laws  

Nothing wrong with my car electrics.

I'm not saying that a car fitted with an Atmo venting BOV won’t pass emissions testing, I’m saying that it causes off throttle richness however most turbo cars without tuning to suit fitted with an Atmo venting BOV won’t pass emission testing if tested properly.

Originally posted by greygirl1976

and gijor33 o2 sensors r in use all the time what do u think helps control a.f ratios

No only during cruise BTW it’s called closed loop. It’s used for fuel economy mainly and to help the cat converter to work hence emissions are corrected.

i'm just telling you what i've learned too from reading the forum. I'm not saying i'm 100% right.

I thought air/fuel ratios are controlled by setting them up with ya laptop on the dyno. And that the O2 sensor is utilised in the warm up stage (as it's not a wideband O2 sensor) so that the ecu reads a hi/low signal (not sure which) so it can add more fuel while the car warms up. Once it's warm it switches back to what the ecu is programmed to do. That's why when you get an A/F Ratio guage from Autobahn they either read full red, or full green... never in between unless you have a wide band O2 sensor

I understand that the factory ECU is a learning computer, but it can only just things a certain amount, taking things like EGT sensor, TPS, and rev/speed history into account as it's designed specifically for that car with the idea that it will remain standard so the a/f ratios are programmed into the computer. I could be wrong, but if you've got a link i can read about your thoughts/experiences that would be sweet.

Cheers,

Andrew

Have a Look at the following links proves what I'm saying is pritty much spot on

http://www.scuderiaciriani.com/rx7/O2_sensor.html

http://www.jimwolftechnology.com/techadvice.html

http://www.autospeed.com.au/cms/article.ht...gestions&A=1513

http://www.teamfc3s.org/info/articles/fcd/diy_fcd.htm

some of these sites may not have info on the current topic but they should give a better understanding of certian efi functions

Enjoy

sorry boys were all gettin confused here all my comments r on factory computer and factory sensors in not saying im right or worng and u guys r right or worng im only going off the cars ive done and tested and what ive been tought at work and tafe well were i used to work ill esrace there words from my memory gijor33 if u have picked all your info off this site its a good 1 coz u r 80% right .how about u damqik gts-t where did u pick up your knowlege you r pritty clued up uourself

fsck... i just wrote a big post and clicked the back button... so it's gone. Anyway, i reckon i'm right as that's what i've been told by plenty of people before :D

i had a stock skyline with exhaust/atmo venting bov and it blew black smoke on gear changes, and my current skyline has an aftermarket computer with a MAP sensor (so no more Air Flow Meter) and it no longer does it.

Andrew

Originally posted by greygirl1976

im on http//www.autospeed.com.au/a_0128/cms/article.html

I can't get to that site... goes to the msn search thing.

I also logged into autospeed and tried typing in the url after and still no good...

yeah... the Air Flow Meter is before the turbo compresses the air, so you need to place the bov between the turbo and the throttle body. The cars that plumb the BOV back into the inlet does so AFTER the airflow meter, but before the turbo. So the air has already been measured by the AFM, and is just fed back inbefore the turbo to be recompressed. As it vents through the turbo it uncompresses. Some say that feeding the BOV back into the inlet just before the turbo helps to keep it spinning, this maybe so if the air is directed towards the turbo.

Although for most people the BOV is there cos they like the sound :D

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • Surely somebody has one in VIC. Have you asked at any shops?  Is this the yearly inspection or did you get a canary?
    • This is where I share pain with you, @Duncan. The move to change so many cooling system pieces to plastic is a killer! Plastic end tanks and a few plastic hose flanges on my car's fail after so little time.  Curious about the need for a bigger rad, is that just for long sessions in the summer or because the car generally needs more cooling?
    • So, that is it! It is a pretty expensive process with the ATF costing 50-100 per 5 litres, and a mechanic will probably charge plenty because they don't want to do it. Still, considering how dirty my fluid was at 120,000klm I think it would be worth doing more like every 80,000 to keep the trans happy, they are very expensive to replace. The job is not that hard if you have the specialist tools so you can save a bit of money and do it yourself!
    • OK, onto filling. So I don't really have any pics, but will describe the process as best I can. The USDM workshop manual also covers it from TM-285 onwards. First, make sure the drain plug (17mm) is snug. Not too tight yet because it is coming off again. Note it does have a copper washer that you could replace or anneal (heat up with a blow torch) to seal nicely. Remove the fill plug, which has an inhex (I think it was 6mm but didn't check). Then, screw in the fill fitting, making sure it has a suitable o-ring (mine came without but I think it is meant to be supplied). It is important that you only screw it in hand tight. I didn't get a good pic of it, but the fill plug leads to a tube about 70mm long inside the transmission. This sets the factory level for fluid in the trans (above the join line for the pan!) and will take about 3l to fill. You then need to connect your fluid pump to the fitting via a hose, and pump in whatever amount of fluid you removed (maybe 3 litres, in my case 7 litres). If you put in more than 3l, it will spill out when you remove the fitting, so do quickly and with a drain pan underneath. Once you have pumped in the required amount of clean ATF, you start the engine and run it for 3 minutes to let the fluid circulate. Don't run it longer and if possible check the fluid temp is under 40oC (Ecutek shows Auto Trans Fluid temp now, or you could use an infrared temp gun on the bottom of the pan). The manual stresses the bit about fluid temperature because it expands when hot an might result in an underfil. So from here, the factory manual says to do the "spill and fill" again, and I did. That is, put an oil pan under the drain plug and undo it with a 17mm spanner, then watch your expensive fluid fall back out again, you should get about 3 litres.  Then, put the drain plug back in, pump 3 litres back in through the fill plug with the fitting and pump, disconnect the fill fitting and replace the fill plug, start the car and run for another 3 minutes (making sure the temp is still under 40oC). The manual then asks for a 3rd "spill and fill" just like above. I also did that and so had put 13l in by now.  This time they want you to keep the engine running and run the transmission through R and D (I hope the wheels are still off the ground!) for a while, and allow the trans temp to get to 40oC, then engine off. Finally, back under the car and undo the fill plug to let the overfill drain out; it will stop running when fluid is at the top of the levelling tube. According to the factory, that is job done! Post that, I reconnected the fill fitting and pumped in an extra 0.5l. AMS says 1.5l overfill is safe, but I started with less to see how it goes, I will add another 1.0 litres later if I'm still not happy with the hot shifts.
    • OK, so regardless of whether you did Step 1 - Spill Step 2 - Trans pan removal Step 3 - TCM removal we are on to the clean and refill. First, have a good look at the oil pan. While you might see dirty oil and some carbony build up (I did), what you don't want to see is any metal particles on the magnets, or sparkles in the oil (thankfully not). Give it all a good clean, particularly the magnets, and put the new gasket on if you have one (or, just cross your fingers) Replacement of the Valve body (if you removed it) is the "reverse of assembly". Thread the electrical socket back up through the trans case, hold the valve body up and put in the bolts you removed, with the correct lengths in the correct locations Torque for the bolts in 8Nm only so I hope you have that torque wrench handy (it feels really loose). Plug the output speed sensor back in and clip the wiring into the 2 clips, replace the spring clip on the TCM socket and plug it back into the car loom. For the pan, the workshop manual states the following order: Again, the torque is 8Nm only.
×
×
  • Create New...