Thread: Another pull-through vs blow through

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This comment demonstrate that you dont know what you are talking....
beacuse if you have a Calum ECU there is a lot of ways to modify the tune if you know how to.... I dont think a B13 MAF will max out on 190 whp.... So their its a problem with the tune....

its not about maxing out a mas air flow sensor... gosh. its about gettting the right readings through the mas air flow so that you can get the most power out of the air. im not maxing my mas air flow at all... read the thread before you talk crap.

Yawn...you obviously havent ever tuned with an SAFC. Going from 10to 12 af range isnt hard at all. Hell my Calum ECU had my car running so rich the wideband gauge wouldnt even read. Threw the SAFC on and tuned it within 5 minutes easy. You also talking about using a DE maf blowthrough and then you also mention how its has an intake the size of a quarter. Who the hell runs a DE maf anyway when they are turbo? This is what IM saying...you keep trying to say that draw through makes more power then blow. Or at least thats what your implying with the title. But I dont agree with that. CLARIFY what your actually trying to say and say that Draw through makes more power then blow through on a DE maf with no tuning from what youve seen. Because that is bascially what your argument here is lol.

This thread isnt helping 95% of the turbo people here because most A. Dont run a DE maf turbo lol much less will you see anyone running one blow through and B. Most people run more to tune with then just a calum basic! You shouldnt make the assumption that most of the people here are just running a calum ECU. Hell if you dont have a Calum Realtime EVEN Calum himself says that its just a base tune and youll probably need something else on top of it. Which is what most people here do...

BTW alot of this wouldve been taken care of if you wouldve noted first that this was a stock bluebird setup with a stock SR20DE maf that you wer trying to run blow through on. I wouldnt have even posted in the thread then. Im done now though...its good to see that the Stock DE maf doesnt run well blow through. But who runs it that way anyway?

Make another thread...swap your cars setup around, retune, and then post the numbers both ways. I bet well see then that it was a waste of time and that the numbers are the same with a Z32/Maxxy style maf(the kind of maf that people who actually want to make power run!).

I agree with this statement. Last year i was running a de with a bb t25, 370's, nismo fpr, walbro, bb ecu and a de maf in blow through, I had no afc and i had the fpr set a 3bar. The problem i was having was the car always ran rich under boost low 10's if not lower than that even at stock boost. I turned the boost up to try and lean it out a bit but it would still run the same mostly because the nismo regulator was doing its job and bringing in more fuel pressure as boost was rising. I have an aem wideband in the car, i have also verified the same readings with a inovate lm1.

I would say if you are running a de or like maf and dont have a way of tuning use it in draw through configuration, as you will most likely run a bit leaner and make more power. I should have been running this way because the blue birds were set up to run like this from the factory.

If you are running an n60, z32, q45 etc and have a way of tuning i would recommend running in blow through.

I have had 4-5 different turbo/ maf set ups on my nx and an n60 in blow through was my favorite, it seemed to have the best driveability and ran great. The only problem i had was maxing out the maf.

1 was a t25/28 jwt ecu bored maf draw through tmic, then i added an safc and upped the boost, next was a gt2871 with a bb det ecu/hks fcon with a water to air i/c, next was a gt2871 with a stock usdm ecu/emanage with a q45 maf draw through same i/c,
Next was the same but a larger trim gt2871r with a 10:1 engine with a stock ecu/emanage. then i went blow through with an n60 with the same set up. And last was a bb set up in blow through configuration.

The set up i am currently working on will be a 9:1 built de, with a jwt ecu 72lb z32 program with either an emanage or an safc to tune, and an undisclosed turbo this will be set up with a blow through maf. The goal of this set up is ultimate drivability and instant boost response with 300+whp on pump gas 93 oct.

I edited my first post

ok, so now.....run to the junk yard, acquire atleast a maxima maf, and re-tune and dyno

Like I said before, the tune is fine. The maf is the issue. You can try and modify the tune, but I don't think it will work with a calum. Here's why: The computer sees the maf voltage and makes adjustments based on what it sees. Now with a datascan you will see that the stock maf goes static in blow-thru. You can not tune this out with the stock computer that I know of because the computer gets confused by what is happening. The maf signal looks like a richter scale during an earthquake when the car gets boost. It doesn't max the maf out, it just fluctuates the voltage wildly so the computer floods the engine with fuel.

I had the same issue on my lightning maf on pull thru. The maf was too close to the blow off valve's recir port. When the BOV would open, the maf would go static because of turbulance and the voltage would swing wildly. The computer would compensate by adding tons of fuel and backing off the timing.

Now when you use an SAFC you can tune out the richness, but I am not sure about refresh rates for that device. If the refresh rate is somewhat slower (doesn't have to be much), then it may act as a "buffer" to the maf signal and the computer may read it just fine. What you need to do is get a way of "smoothing" the maf signal out so that the computer doesn't whack out.

Call JWT, their engineers have had many discussions with me about this same issue. It's about turbulance, not tune.

As per my observations with a Consult adapter:


Thread here:
http://www.sr20-forum.com/tuning/11269-weird-observations-through-consult-logs.html

Since the stock DE MAF relies on basically air moving through the big hole to draw air through the small one, I think what is happening is that it is not liking the air basically being forced through the small one, instead of drawn through it.

Is there a MAF sensor that works similar to the stock one but is open element like the "upgrade" ones that doesn't require a retune?

Thank you for posting that! It helps out a lot. Now we all can see that your maf is making the computer pull timing when it peaks out and pulses injectors to 100%. I haven't looked at a computer signal on the calum software, since I have datascan, so these logs are a lil diff from what I have seen. The thread helped out a lot, though I didn't read the whole thing.

My graph looks a bit different, but doesn't peak out. It spikes up and down rapidly between max voltage and min voltage when it hits full boost.