Venting on my GSX???

[97GSX88]

This is on a 97 GSX. Recently I purchased a Greddy Type-RS BOV with upper intercooler piping. I also purchased an Apexi SAFC II. For the first time I ran this setup (also have injen intake on it) I ran it so the BOV recalculated. Then one night I was going over my engine chcking the coolant level, oil, and all that stuff. I went to put on the piece for the BOV to vent into the atmosphere. I plugged the intake and it worked?! Now this is what really has me thinking. I ran it and it runs just as good venting as it did recirculated. I figured that wasn’t right. So I did about 2 hours of searching last night. I found most people saying that venting is bad, recirculated it. I understand that it helps turbo spool, and it can cause the engine to run rich and stall out, but it works fine on my car maybe a little bit faster spool but nothing major. Maybe it has to do with it being an auto tranny instead of manual? BTW the SAFC II is just monitoring the engine right now, I am in the middle of buying new pump, reg, injectors and all that good stuff so I have not really played with SAFC b/c I know it wont do that much since my fuels system is factory as of now. I am using a factory MAS and MAF, I planned on buying the GM MAS and MAFT but I don’t know now. If somebody could help me I would really appreciate it, I am kind of stuck on this one.

Thx
Chris

 

[Talesin]

Short version, it may seem to run fine, but any air you vent from it will still have been counted by the ECU, causing you to run rich between shifts. It may not cause stalling, smoking, or 'buttometer' slowness (varies from car to car), but if you datalog it and check it on a dyno, running non-recirculated (without the MAF-T/GM MAS) will make less power, give worse mileage, and in general is the #1 newbie DSMer mistake.

Recirculate, or shell out the money to vent right, unless you really don't care how the car is running. :b

 

[mitsuclipsegsx]

if you have an auto , i think its fine to vent...

 

[Shane2GSX]

if you have an auto , i think its fine to vent...

I speak from first hand experience, just because you have auto doesn not make it fine to vent. Before I bought my manual GSX that I have now, I owned a 97 GST Auto. I vented a Blitz SS (old style) BOV to atmosphere with the SAFC II (back when I didn't know any better) and it was fine as long as I didn't let off the gas. When your auto, you obviously don't have to let off the throttle to shift gears. You can just leave the pedal smashed to the floor. Up to this point, my car would run perfect, had no ill effects. However, if I had to let off just a little more than half throttle and kept it there, my car would stumble and jerk back and forth. I believe this was do the the SAFC trying to compensate for the lost air, then losing air again because I was venting and that cycle would just continue until I changed throttle position. If I let off the gas completely, my car would jerk you forward ever so slightly. The car would also run rich and shoot flames. That's wasted energy, as is venting. So, IMO I would not vent even though you are auto (unless you have a MAFT setup). Otherwise, you will still see negative side effects.

 

[dalatinromeo]

DON'T VENT!!!!!!

If you are going to vent, vent correctly. If you vent incorrectly you will run into many problems running rich, stalling, and idle problems. You may not notice, but get a logger or some way to monitor your engine, and you will see you are running rich and start having problems.

Venting is great, WHEN DONE CORRECTLY. You wiill spool faster and enjoy the sound more. Hope this helps you.

Stay boostin

 

[DSM_Obsession]

if you vent its best to go ahead and get the GM MAS because most of the time you'll hvae rough idle

 

[Apeximprt2nr]

Don't vent. It doesn't matter if you have a M/T or a A/T. Venting is venting. If you're gonna vent, do the GM MAS mod. If not, expect the ill effects of it.

 

[oldman]

I think the point has been made.