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blow through or draw through

Thread: blow through or draw through

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Posts: 21-30 of 34
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2012-03-30 15:58:47
#21
Originally Posted by ashtonsser
Depends,

Yeah DE maf will not be able to go anywhere near 325whp safely. Youll basicly lose fuel tuning ability past 250whp because it will be maxed out.

You can get an n62maf for like 40-50 bucks now a days. 300zx or Infiniti J30, I bought 3 of them from a junkyard and paid 40 a piece for them with pigtails and sold them for 60 a piece.

As for blowthrough or draw through.

Ive always ran my turbo setups in blowthrough without issues. Ive used stock DE mafs in blowthrough up till the point they were maxed then switched to n62 maf. Ive done many many turbo setups on friends and customer cars and my own all blowthrough and not one issue. Run open bov all you want with no reprocussion. Pop a chargepipe off (as long as its not between the maf and throttle body) and you can still drive the car home. Overall better response going from drawthrough to blowthrough. As for a/f ratio differences, I really didnt see any. Maybe .1-.2 difference leaner on blowthrough. If your on a basic ecu upping the fuel pressure 1-2psi will take care of that. On a realtime, well just fine tune it. Simple as that.

Youll have your hatas of blowthrough (specificly BenFenner) that will come in and say that the proper way its supposed to be ran is drawthrough and bov recirculated. But pfff, In all my experience with it, blowthrough owns drawthrough in every way. Yes its not the way factory set it up but thats probably because they did it for longevity of the maf but soo far ive yet to kill a maf having it in blowthrough config.


I plan on running stock boost for awhile so i dont see me getting past 250 whp right now. I will be running stock ecu with a safc II piggyback. Stock boost on a rwd sr20det t25 is 7psi I believe?

If I wanna push it past that i will prly find me a n62 maf.

Blow through seems to be the best from what i have been hearing. Pros- can still drive car home if charge pipe blows off and can go open bov which i want to do. Is there any cons? Other than not lasting as long.
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2012-03-30 16:03:49
#22
The not lasting long is a myth so far. Ive yet to hear anyone kill a maf on blow through. I believe b15's had maf problems anyways but ive got several buddies still running their b13 stock mafs in blowthrough for years now without problems.

Youll be fine on 7 lbs with a stock maf. Even to 10 lbs or so.

After that upgrade is in order.
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2012-03-30 16:07:01
#23
Well that pretty much sums that up. Gonna go blow through and never look back!
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2012-03-30 16:08:46
#24
RR maf are not the same as DE maf's. They are similar to the specv/1.8 sentra maf. They work fine blow through, most spec v guys down here run them blow through with no issues.
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2012-03-30 16:12:01
#25
Guys his DE maf is is not the same DE maf that B13's and B14's have. His is plastic and is 3", the Roller Rocker DE maf. It can read up to the same rate as E60/N60/VE mafs since they are very similar.

On G20.net we have a saying... car troubles? It's always the MAF.

The problem with them is sensitive wires, they are sensitive to vibrations and probably to air flow. I've replaced mine once already on a 50k car. Regular DE maf with 130k miles was just about brand new.
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2012-03-30 16:12:59
#26
Looking back at miko's thread on the mafs, the DE maf is weaker than the RR maf.
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2012-03-30 16:19:30
#27
I understand the RR mafs are not the same. Like I said, b15's and p11's had maf problems galore. Either way Id recommend the n62 anyways. You can correct your fuel with the SAFCII hotwire option.

Just spend the money now if you have it.
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2012-03-30 16:36:03
#28
Originally Posted by ashtonsser
I understand the RR mafs are not the same. Like I said, b15's and p11's had maf problems galore. Either way Id recommend the n62 anyways. You can correct your fuel with the SAFCII hotwire option.

Just spend the money now if you have it.


yep the b15/p11 maf suffers from vibration related failure.
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2012-03-30 17:07:39
#29
Originally Posted by 01_Sentra2.0
Looking back at miko's thread on the mafs, the DE maf is weaker than the RR maf.


It's not "weaker" for say, it's actually much stronger. It just can't read the air above a certain horsepower point. Regular DE mafs are horrible for blow through because they get piped down to 2" hole.

Just run the RR maf, your set on it, why bother wasting your time hearing it from us. It probably will last, just not as long as the others, just make sure it's mounted well.
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2012-03-30 17:15:35
#30
uhh oh vadim is getting mad

only problem i ever saw with a maf on blowthrough is the top blowing off on high boost
Last edited by morgans432 on 2012-03-30 at 17-23-01.
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