GM MAF in draw through

[Spades]

Are there any disadvantages in using a GM MAF in a draw/pull through type configuration? I have no interest in BOV venting, im just wanting to know from actual performance or reliability perspective

 

[diambo4life]

No, however, if you got a blown coupler you wouldn't get stranded or have an undrivable car with a blowthru setup. That's one big reason I like the blow through setup. It has saved my ass several times.

 

[knochgoon24]

No, however, if you got a blown coupler you wouldn't get stranded or have an undrivable car with a blowthru setup. That's one big reason I like the blow through setup. It has saved my ass several times.

That's the same reason why I'm switching to SD. I've had couplers blow twice and neither was in a good spot to fix it.

I really don't see why you'd want to use it in draw through.

 

[myturbo]

I think it worked better as a suck threw.

It is even posted on ecmlink that it works better that way . (or they think, idk)

 

[diambo4life]

Yes, you have fewer metering issues (with DSM/ECMlink) with it in draw-through. I personally have not tested this since I run a 4" inlet on my turbo and there's no way I'm putting a 3" anything in front of it.

 

[Spades]

No, however, if you got a blown coupler you wouldn't get stranded or have an undrivable car with a blowthru setup. That's one big reason I like the blow through setup. It has saved my ass several times.

Im not understanding this?/\ /\ If you are getting blown couplers wouldnt you want to place the maf on the side that sees no pressure? It is, after all, the pressure that is causing the couplers to get blown off in the 1st place

 

[skatershawn]

No.. with a blow through setup the gm maf is placed right before the throttle body elbow.. and with a draw throught its infront of the turbo!
When you blow a coupler with draw through and have a boost leak it causes your ecu to read more air entering then is actually getting used during combustion! If you have it setup blow through and have a boost leak some where before the gm maf you are only loosing that air the turbo is taking in and its not causing you to run a rich mixture! (IF... its before the gm maf)

Now most people get the gm maf for blow through so they can vent the BOV!
NOT all do, but most do! The gm maf let alot more air flow through it than the 1g maf or the 2g maf!
but if you not looking to vent your bov then are you planing on over running your 2g maf?
if so you can still get a evo maf and that is good for up to 600+ hp apps!

Or you can get it for the use of ME and diambo4life like it for... the fact that its blow through and its at the end of you intake system!

And you being in cali, i dont see that working with the state laws!!!
I know their tough out there with this kind of sh*t!

Hope this helps.. if so.. tag it so.

Hope you figure it out, and good luck!

 

[diambo4life]

Thanks skatershawn. You nailed the reasoning perfectly.

 

[dsm-onster]

Personally I've seen a more stable maf reading ind drawthrough and consequently a more consistant tune vs. running the gm maf in blowthough. Less headaches. I use t-bolt clamps decent couplers with beeded joints. I don't blow pipes off at over 30psi.

 

[Boosted98gsx]

You WILL get a more accurate airflow reading with the MAF in pull through, as it's not designed to be run in the pressurized conditions that we put them in while they are in blow through. Pull through will give you the most accuracy, but if you're doing that, you might as well do to an EVO maf or retain the 2g MAF, they are FAR more accurate.

You will lose drivability if you blow a coupler off, or a hole through them, and you will also have to account for every boost leak between the MAF and the engine, this is the same as with blow through, but obviously, there will be less places for boost leaks to occur in a blow through setup that will affect A/F metering.

Alternatively, you can switch to SD, which simply calculates fuel enrichment based on a base VE chart of your engine. You don't need to worry about ANY boost leaks with SD affecting your A/F ratios, only overworking your turbocharger. You can completely disconnect your charge piping, and your engine will still operate normally and let you drive home, as long as your MAP sensor and AIT sensor are still reading the airflow entering the engine.

Each setup has pros and cons.

Draw through
Pros - Accurate
Cons-Boost leaks are a large factor

Blow through-
Pros - Less to worry about in terms of boost leaks affecting A/F
Cons - Inaccurate (comparatively to draw through)

SD
Cons - Relatively difficult to dial in
Pros - accurate and less restrictions in the path of your airflow

 

[turbowop]

Blown couplers would be a non-issue if people would just use bead rolled pipe ends. I've *never* had a coupler blow off and my car sees 30psi everytime I take it out of the garage.