MAF Before of After the Turbo
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Joined: Nov 2008
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From: PA
I switched it back last night and its running again. Still working on the the unclamped part of maf map i have the hardest time on that lol. The O2 map needs a little work. But for the most part im fine till I get a pro to tune this thing with a larger spring.
My engine didnt blow ? But it is in pieces - the car and motor only had 18K lol but I got other whip as DD. I got alot of crap going on besides my car and a girl that has been taking up all my time not to mention $$ lol but prob next summer.
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Scionetics
KAD
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Joined: Oct 2005
Posts: 11,936
From: Western NY
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Joined: Apr 2009
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From: Buffalo, NY
Personally I would do after the turbo for a few reasons.
1. The IAT sensor is in the MAF. You want the most accurate IAT readings possible and what is under the hood and what is coming out of the inter cooler are two different things. So getting the correct readings are important.
2. Less restriction in front of the turbo. Granted the stock MAF is not very restrictive. However most intakes that have to house them can be. So eliminating that from the intake and putting it post turbo will allow you to run a much larger intake with a larger filter. Larger filters have more surface area and lend to a less restrictive setup. This will improve spool and performance of the turbo charger across the board.
3. You can run a BOV and dump to atmosphere with no issues.
The only thing you want to keep in mind is that when you run it blow thru that if you have an oil leak from your turbo your chances of damaging the sensor are greater.
1. The IAT sensor is in the MAF. You want the most accurate IAT readings possible and what is under the hood and what is coming out of the inter cooler are two different things. So getting the correct readings are important.
2. Less restriction in front of the turbo. Granted the stock MAF is not very restrictive. However most intakes that have to house them can be. So eliminating that from the intake and putting it post turbo will allow you to run a much larger intake with a larger filter. Larger filters have more surface area and lend to a less restrictive setup. This will improve spool and performance of the turbo charger across the board.
3. You can run a BOV and dump to atmosphere with no issues.
The only thing you want to keep in mind is that when you run it blow thru that if you have an oil leak from your turbo your chances of damaging the sensor are greater.
Personally I would do after the turbo for a few reasons.
1. The IAT sensor is in the MAF. You want the most accurate IAT readings possible and what is under the hood and what is coming out of the inter cooler are two different things. So getting the correct readings are important.
2. Less restriction in front of the turbo. Granted the stock MAF is not very restrictive. However most intakes that have to house them can be. So eliminating that from the intake and putting it post turbo will allow you to run a much larger intake with a larger filter. Larger filters have more surface area and lend to a less restrictive setup. This will improve spool and performance of the turbo charger across the board.
3. You can run a BOV and dump to atmosphere with no issues.
The only thing you want to keep in mind is that when you run it blow thru that if you have an oil leak from your turbo your chances of damaging the sensor are greater.
1. The IAT sensor is in the MAF. You want the most accurate IAT readings possible and what is under the hood and what is coming out of the inter cooler are two different things. So getting the correct readings are important.
2. Less restriction in front of the turbo. Granted the stock MAF is not very restrictive. However most intakes that have to house them can be. So eliminating that from the intake and putting it post turbo will allow you to run a much larger intake with a larger filter. Larger filters have more surface area and lend to a less restrictive setup. This will improve spool and performance of the turbo charger across the board.
3. You can run a BOV and dump to atmosphere with no issues.
The only thing you want to keep in mind is that when you run it blow thru that if you have an oil leak from your turbo your chances of damaging the sensor are greater.
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Scionetics
KAD
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Joined: Oct 2005
Posts: 11,936
From: Western NY
Good info, thanks Don. I'd like to go blow-thru but have one concern. Since I'm tuning off the MAF with the X1 I really should keep the MAF in a 3" tube but that would mean having 2" tubing from turbo to IC, 2.75" IC out into 3" tube and then reduced to 2.5" at the TB. I'm unsure about the ramifications of running a large 3" tube between the IC and TB. What do you think? TIA
Yes, but only so that the MAF sits in a oem size tube. I'm thinking that as long as I'm making a new intake, why not go blow-thru and vent the BOV to atmosphere. I'd still make a new 3" air intake for the turbo.
I'm just not sure how well a 3" tube would work in this location.
I'm just not sure how well a 3" tube would work in this location.
Personally I would do after the turbo for a few reasons.
1. The IAT sensor is in the MAF. You want the most accurate IAT readings possible and what is under the hood and what is coming out of the inter cooler are two different things. So getting the correct readings are important.
2. Less restriction in front of the turbo. Granted the stock MAF is not very restrictive. However most intakes that have to house them can be. So eliminating that from the intake and putting it post turbo will allow you to run a much larger intake with a larger filter. Larger filters have more surface area and lend to a less restrictive setup. This will improve spool and performance of the turbo charger across the board.
3. You can run a BOV and dump to atmosphere with no issues.
The only thing you want to keep in mind is that when you run it blow thru that if you have an oil leak from your turbo your chances of damaging the sensor are greater.
1. The IAT sensor is in the MAF. You want the most accurate IAT readings possible and what is under the hood and what is coming out of the inter cooler are two different things. So getting the correct readings are important.
2. Less restriction in front of the turbo. Granted the stock MAF is not very restrictive. However most intakes that have to house them can be. So eliminating that from the intake and putting it post turbo will allow you to run a much larger intake with a larger filter. Larger filters have more surface area and lend to a less restrictive setup. This will improve spool and performance of the turbo charger across the board.
3. You can run a BOV and dump to atmosphere with no issues.
The only thing you want to keep in mind is that when you run it blow thru that if you have an oil leak from your turbo your chances of damaging the sensor are greater.
*When I was speaking with Paul about blow through set ups he mentioned that success with running the BOV to atmosphere is contingent to the design of each set up. That makes sense since there are certain precautions that must be made in order to prevent turbulence. Could you or Paul elaborate on those guidelines ie MAF must be 6inches or further from the BOV and away from bends?
((((((((((((((((((((((deathbyc4 When your charge pipe blows off at 100 mph, you can still drive the car with the maf after the turbo.
I can vouch for this last night
))))))))))))))
doh
I can vouch for this last night
))))))))))))))doh
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