MAS location

[1toofastlt1]

I have a 97 Z28 with a vortech v1 blower on it and the MAS is on the inlet of the supercharger. should I put it after the blower on the charged side?

[hotrod96z28]

thw MAF should be between the blower and the intake so it gets a proper reading and the comp can accuratly adust the fuel mixture

[1toofastlt1]

ok should i move it? vortech says a such trough but you say a blow through. if i move it will the mess up my tune?

[popo8]

I have a procharger and mine is just before the elbow between the intercooler and the intake.....

[Chris]

It shouldnt matter, As long as where it is at and after there are no air leaks

[1toofastlt1]

ok i might move it and see if anything changes

[Fire67]

Its very likely that it will throw off your tune after moving it...

With that said, moving it is better and heres why:

1) The MAF sensor will make its readings off of actual air entering the manifold.
1a) The MAF will also be reading the heated air rather than the cool air on the other side of the blower. Hotter air is less dense and therefore has less MASS which affects fueling.
1b) Its easier to tune areas of the computer that affect driveability and transitions when the MAF is getting an accurate signal of air entering the motor rather than entering the blower then recirculating and heating before entering the engine (think delay and heat).
2) With a Blow-through setup, the bypass valve can be changed to a blow-off valve and vent heated air to atmosphere rather than have it recirculate and heat the charge air more.

Its advisable to locate the MAF as close to the TB as possible and the BOV as far from the TB as possible when venting bypass air to atmosphere. This prevents the air from reverting back through the MAF when the throttle closes and the bypass valve opens. Though a small amount of reversion is very easy to deal with from a tuning stand point. Much easier than getting driveability stuff dialed in when air is being measured and not ingested by the engine.

[1toofastlt1]

ok so i moved it today and the car is surging and the fueling is way off at idle. i didn't even drive it yet. here is a vid to help its just a cell vid sorry
YouTube - camaro idle

[1toofastlt1]

i noticed when i plug the bypass valve it idles normal. whats going on?

[BLOWNDFIZ]

I can't see where your MAF is in relation to your bypass valve at work (system won't let me see youtube, damn work filters). Anyway if you are venting to atmosphere and not recirculating your bypass air now your MAF needs to be after your bypass valve. It may be I just can't look at what you have posted. If your bypass if after the MAF then the air going out the bypass is throwing off the tune.

My suggestion would be to route the bypass in circulation if you are in fact trying to vent to atmoshpere and see if that solves the problem.

[1toofastlt1]

I can't see where your MAF is in relation to your bypass valve at work (system won't let me see youtube, damn work filters). Anyway if you are venting to atmosphere and not recirculating your bypass air now your MAF needs to be after your bypass valve. It may be I just can't look at what you have posted. If your bypass if after the MAF then the air going out the bypass is throwing off the tune.

My suggestion would be to route the bypass in circulation if you are in fact trying to vent to atmoshpere and see if that solves the problem.
i have a blow through set up now and the bypass valve is located between the blower and the MAF. so the MAF isn't reading the air yet.

[1toofastlt1]

ttt i still need help.could it be the tune? if so what table would i change

[Fire67]

Air FLOW--> Filter--> Blower--> Bypass Valve --> *Intercooler--> MAF--> Throttle Body

Is your system plumbed like that? This is the only way it will idle if your venting the bypass to atmosphere instead of recirculating.

Either way you'll probably need the tune adjusted.

[1toofastlt1]

just like the but with out a intercooler

[1toofastlt1]

so if it is my tune that is off what tables would i mess with to fix that.

[Fire67]

How much distance is there between the BOV and the MAF?

[1toofastlt1]

about 5 or 6 inches

[Fire67]

Is it possible for you to pick get it any farther from the MAF? You do need some distance there or the MAF will be seeing air reversing direction through it. The problem with this is that the MAF cannot tell which direction the air is going. So its basically reading air that is not entering the engine.

To prove/disprove this theory, look at wideband data if you have it available. If it goes rich when its running like crap then you are definitely metering air that is not entering the engine. If not, then the problem lies somewhere else.

[1toofastlt1]

O OK that makes sence but it goes lean not rich. do you think it might be in my MAF table? i might need to bump it up a little

[Fire67]

You could try fudging the MAF table some in that area. Let me know how it works out.

[1toofastlt1]

ok i will give it a shot and let you know