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View Full Version : BOV to atmosphere

04 Mach1
03-07-2006, 07:51 PM
Is there anything different I must do for my start up tune? BOV is after Maf.
QWKSNKE
03-07-2006, 07:55 PM
BOV must be before the MAF to vent to atmosphere
04 Mach1
03-07-2006, 08:32 PM
Is there not away around this with the tweecer???
sailorbob
03-08-2006, 05:10 AM
Probably not, there's no way to know how much metered air is being lost and the eec has no idea of what's going into the engine. Why not use a recirculating dump valve?
EZ SPEED
03-08-2006, 06:33 AM
There are Guys with Turbo Gen 1 Lightnings doing it...BUT....I dont know howthe hell they are getting away with it...they must be awesome tuners. :shrug:
sailorbob
03-08-2006, 10:18 AM
The only way I can of doing it is;

air filter - turbo - intercooler - bov - maf - throttle - manifold

Intercooler and bov could be the other way around, so could the maf and throttle.
04 Mach1
03-08-2006, 04:50 PM
The last time I went to the track(months ago) there was a superchargered 86 gt with his vented to the atomsphere, I asked about it and he said it didn't have any tuning or even a chip the only problem was after a wot it would try to die. The car went 10.20s all day.
Wall96cobra
03-08-2006, 05:01 PM
He must of had a blowthru maf setup (bov before the maf and maf after the supercharger). If you try to run it vented to atmosphere with a drawthru maf it will run like shit!!! I had mine vented to atmosphere for a while but it was a blowthru maf setup.
04 Mach1
03-08-2006, 05:32 PM
The same setup as me other than his was all paxton.
86GT
03-08-2006, 06:16 PM
If it was a true 86 then there is no MAF. The 86 is speed density not MASS AIR.
QWKSNKE
03-08-2006, 06:41 PM
If it was a true 86 then there is no MAF. The 86 is speed density not MASS AIR.

:yup:

I was going to mention that as well
86GT
03-08-2006, 07:22 PM
I would have stayed SD if the tweecer or other tuner would have supported it. Since I have A VP1 EEC there is no support.
04 Mach1
03-08-2006, 07:34 PM
Sorry forgot to mention it had a maf conversion.
QWKSNKE
03-08-2006, 07:57 PM
Marc,
Do you know if this car you are talking about was a full race car or whether he drove it on the street much
04 Mach1
03-09-2006, 04:36 PM
Ya you got a point, they said it saw very very little street use.
Disney Lincoln
03-10-2006, 12:13 AM
I did it with the TwEECer. It's not perfect YET, but it's 1000 times better than it was before tweaking it. You have to relate the MAF voltage to the TPS. I also messed with the load scaling a lot to make it work.

In the end I put it back. Not worth the hassle.
Wall96cobra
03-10-2006, 07:57 AM
I did it with the TwEECer. It's not perfect YET, but it's 1000 times better than it was before tweaking it. You have to relate the MAF voltage to the TPS. I also messed with the load scaling a lot to make it work.

In the end I put it back. Not worth the hassle.



Yeah but I don't think it would work on a supercharged car, if you set the bov as tight as it would need to be you'd get some wicked surging since the supercharger is running off the crank.
lukem80
03-10-2006, 03:14 PM
I had a BOV to the atmosphere on a mod motor with a PRO-M Blow thru... that think wouldn't idle for crap. maybe if you could get a good tuner? Tim @ MPH said he hated to tune ones like that

save the "shhhhhsssssssssssss" for the import guys
QWKSNKE
03-10-2006, 09:33 PM
mine is vented to atmosphere with no drivability problems (blow thru MAF setup).

Only thing I hate is that it is loud as hell at idle and going down the road. Its very annoying