MAF Airflow Straightener Testing

[G26]

So, like I said, is this something you would recommend doing with the stock pull through setup, on a sri?

Btw, I found this site that seems to offer custom Honeycomb sizes cheap.

http://www.saxonpc.com/100mm-cells-for-100.html

[SSinstaller]

Originally Posted by G26 So, like I said, is this something you would recommend doing with the stock pull through setup, on a sri? Btw, I found this site that seems to offer custom Honeycomb sizes cheap. Honeycomb for MAF

If you are not running a larger than OEM maf housing there is no reason to add the straightener.

[MZR165]

So, there wouldn't be any benefit at all if you have an OEM MAF housing or just very negligible.

[SSinstaller]

Unless you have a very shitty intake there will be no benefit..

[Dano]

Just read this whole thread and I have to say my head exploded a couple of times..LOL

now that I have it back together and on the subject of OE maf size and the need or no need for honeycomb.

since the air coming through the filter is very turbulent, will the honeycomb still not have a positive effect on flow. Typical SRI filters are only a few inches away from the MAF itself and I have to believe the airflow is all outta whack...[engineering term there]

1) would it improve idle stability
2) would it improve WOT operation

edit: I guess SS already answered both while I was posting...

[djuosnteisn]

Originally Posted by SSinstaller I'm still running the small filter CP-E sends with the big maf housing, I think that coupled with the maf straightener is creating significant vacuum in the compressor at WOT lowering efficiency as the vacuum rises... I will rectify this problem when I go blow through...will be running a full 4" intake with this filter. I haven't finished the map revisions yet, but it looks like it will be closer to 20~30g/s...so even on my current setup it's not that big of a restriction..

Why not just put the filter on the turbo?

Now you got me thinking between 4" intake vs blow through and filter on turbo.


I think i'll have to do the blow through now hahahaha.

[bcmurphy87]

im doing blow through...i just need to get the car running to tune it. i havnt ordered an air striaghtner yet.

[BlueStreak]

I imagine IATs would be significantly hotter with just a filter on the turbo, no?

[djuosnteisn]

Originally Posted by BlueStreak I imagine IATs would be significantly hotter with just a filter on the turbo, no?

trade offs between pressure ratios and temp inefficiencies.


I kinda want to try my hand at tuning a 4" intake with a maf for giggles, and then fab a blow through as well.

[superskaterxes]

Originally Posted by G26 So, like I said, is this something you would recommend doing with the stock pull through setup, on a sri? Btw, I found this site that seems to offer custom Honeycomb sizes cheap. Honeycomb for MAF

does anyone read the OP these days? lol

[G26]

Originally Posted by superskaterxes does anyone read the OP these days? lol

nah, lol.

[SSinstaller]

Originally Posted by djuosnteisn Why not just put the filter on the turbo? Now you got me thinking between 4" intake vs blow through and filter on turbo. I think i'll have to do the blow through now hahahaha.

It would hit the brake fluid reservoir.. It's not going to be much of an intake really, just a 45deg coupler a few inches of 4" pipe and 14" of filter...

[Dano]

Originally Posted by djuosnteisn trade offs between pressure ratios and temp inefficiencies. I kinda want to try my hand at tuning a 4" intake with a maf for giggles, and then fab a blow through as well.

IMO blow through is waaaaay easier and probably provides more stable AF control.

[djuosnteisn]

Lol, blow thru is far from easy to tune for.... at least the one time i've tried.

Long tubes are a blessing, and this air straightener is probably the key to success. I'll do both tho, because race fabricator.

[Dano]

ok then...I just gathered from this thread and from guys that had big mafs and then went back to OE that it was a PITA to run a big maf.

blowthru wouldn't' require any scaling right?

I could see the need to either negate the IAT tables or split the harness and put another IAT sensor in the intake pre turbo.

[djuosnteisn]

Originally Posted by Dano ok then...I just gathered from this thread and from guys that had big mafs and then went back to OE that it was a PITA to run a big maf. blowthru wouldn't' require any scaling right? I could see the need to either negate the IAT tables or split the harness and put another IAT sensor in the intake pre turbo.

I dunno, i've honestly never had a horrible time calibrating larger intakes. That's the main reason i want to try a 4", just cause i know it should be a pita lol. I want to try nonetheless.

For the temp sensor on the maf, i think you want to keep it with the maf sensor. So that the ecu can account for the density of the air stream blowing across the hot wire. And i think scaling would be necessary if the pipe diameter changes. If / when i do blow through, i'll probably use a 3.25" I.D. pipe like before. Or at least a 3". You can just as easily max the maf in blow thru as draw thru from what i understand. I mean, it's not like the mass of air is changing just cause it's under pressure, right?

Check out these blow through options for wrx (which will fit our maf sensor exactly btw):
MegaMAF Blow-Thru MAF Housing (with couplers)

Notice how they offer different diameters for increased power goals?

[Ziggo]

DJ gets +1 internets.

If a 3" draw-thru is getting maxed, a 3" blow-thru would be maxed as well. The MAF measures mass flow, not velocity.


Zigatapatalka

[djuosnteisn]

Lol @ how my car will look with a 3.25" cold pipe.

[Jackis]

Nice thread... subbed.

Feel myself like dumb actually... Graduated 4yrs ago, didn't have fluid or hydrodynamics course (applied math department), but realized I totally forgot almost all this stuff behind rotors, divergences, Navier-Stocks ODEs....

[Navy_Mech2]

good find. bigger and wayyyyyyyyyyyy cheaper than cpe's 3.25" housing

[G26]

Eh i just ordered one for the hell of it. If it doesn't work out, im out $5. Only thing I am concerned about is the running rich at wot with it.

[MarkyMark]

Originally Posted by djuosnteisn I dunno, i've honestly never had a horrible time calibrating larger intakes. That's the main reason i want to try a 4", just cause i know it should be a pita lol. I want to try nonetheless. For the temp sensor on the maf, i think you want to keep it with the maf sensor. So that the ecu can account for the density of the air stream blowing across the hot wire. And i think scaling would be necessary if the pipe diameter changes. If / when i do blow through, i'll probably use a 3.25" I.D. pipe like before. Or at least a 3". You can just as easily max the maf in blow thru as draw thru from what i understand. I mean, it's not like the mass of air is changing just cause it's under pressure, right? Check out these blow through options for wrx (which will fit our maf sensor exactly btw): MegaMAF Blow-Thru MAF Housing (with couplers) Notice how they offer different diameters for increased power goals?

We have BIg Power Aeros MAF housings finishing next month. 3" ID for big dogs and 3.25" ID for even bigger dogs.

[SSinstaller]

Originally Posted by StreetUnitMark We have BIg Power Aeros MAF housings finishing next month. 3" ID for big dogs and 3.25" ID for even bigger dogs.

You might as well skip the 3".

3.25" and 3.75", would be better...

[86AmishMs3]

Originally Posted by SSinstaller You might as well skip the 3". 3.25" and 3.75", would be better...

Nothing should be wrong with 3" for those staying under 450wheel. Also consider sumark said ID

[J-Liss]

awesome work skates! cant wait to see the outcome, then copy your ass.

[djuosnteisn]

Originally Posted by StreetUnitMark We have BIg Power Aeros MAF housings finishing next month. 3" ID for big dogs and 3.25" ID for even bigger dogs.

If you need help with calibrations, just lemme know. It would be cool if you published maf values for each intake IMHO.

Originally Posted by djuosnteisn I dunno, i've honestly never had a horrible time calibrating larger intakes. That's the main reason i want to try a 4", just cause i know it should be a pita lol. I want to try nonetheless.

Oh, and i just read my quote from a while back about trying a 4" intake... cause it should "theoretically" be difficult. I calibrated my 4" intake in one try... hahaha. Definitely wasn't an issue whatsoever.

[bcmurphy87]

Well i feel safe to safe that im running a blow thru set up perfectly now with just a 4in filter on the turbo. I did not work right until i added the honeycomb in the OP post and put about 8.5in of straight pipe in front of the maf.

[djuosnteisn]

Originally Posted by bcmurphy87 Well i feel safe to safe that im running a blow thru set up perfectly now with just a 4in filter on the turbo. I did not work right until i added the honeycomb in the OP post and put about 8.5in of straight pipe in front of the maf.

IIRC, we tried a honeycomb originally on the shorter section... and while "better", it still wasn't enough, right? The real saving grace was the extra length IMO.

I might be remembering wrong though lol.

[bcmurphy87]

Originally Posted by djuosnteisn IIRC, we tried a honeycomb originally on the shorter section... and while "better", it still wasn't enough, right? The real saving grace was the extra length IMO. I might be remembering wrong though lol.

You are VERY VERY correct! Length is everything. Do not think adding the straightener will compensate for being to short. I think we were having issues at 6 inches. The saving grace was the 8 inches or better.

[MarkyMark]

Originally Posted by djuosnteisn If you need help with calibrations, just lemme know. It would be cool if you published maf values for each intake IMHO. Oh, and i just read my quote from a while back about trying a 4" intake... cause it should "theoretically" be difficult. I calibrated my 4" intake in one try... hahaha. Definitely wasn't an issue whatsoever.

We weren't even going to go that far. We were just going to make available a larger housing with airflow straightener for you guys to calibrate with ATR once you got it.

[wolly6973]

Originally Posted by bcmurphy87 You are VERY VERY correct! Length is everything. I think we were having issues at 6 inches. The saving grace was the 8 inches or better.

That's what she said...

[djuosnteisn]

Originally Posted by bcmurphy87 You are VERY VERY correct! Length is everything. Do not think adding the straightener will compensate for being to short. I think we were having issues at 6 inches. The saving grace was the 8 inches or better.

Originally Posted by wolly6973 That's what she said...

Beat me to it. Just don't beat me with it.

Originally Posted by StreetUnitMark We weren't even going to go that far. We were just going to make available a larger housing with airflow straightener for you guys to calibrate with ATR once you got it.

Well if you want, i'd be happy to dial in a few, and publish the maf values in the perm tuning section. Wouldn't hurt for people to have a starting point. Just lemme know if you want.

[BobtailedSnail]

Originally Posted by djuosnteisn If you need help with calibrations, just lemme know. It would be cool if you published maf values for each intake IMHO. Oh, and i just read my quote from a while back about trying a 4" intake... cause it should "theoretically" be difficult. I calibrated my 4" intake in one try... hahaha. Definitely wasn't an issue whatsoever.

So do have pull through or blow thru?

I'm buying a new block to build and am going topmount BT with this new ground you guys are covering with the Intake manifolds and now this straightener business it brings a lil more hope for a high HP DISI. i think ima bite the bullet and go HTA3794R w/T4 twinscroll 1.00A/R hotside and i believe it does have a 4in. compressor inlet and i think a 2.5 outlet. My concern is that with all the pipe size changes what would be an optimal IC inlet/outlet size and if it could come into play with air uniformity/turbulance.

This peaked my intrest with DJ talking about the 4in intake. Also has anyone ever concidered a different MAF like the Mustang ones that are 3.5in+ and have the components centered in the housing or is this no longer a problem?

sorry my head has been hurting from reading this thread even tho ima Mechanical Engineer major just haven't had these classes yet lol.

[djuosnteisn]

My intake is pull through, like normal... just much much larger.

That's a big fucking turbo your talking about lol. Fuel should be your #1 concern IMO. The rest will be easy, hahaha.

2.5" IC piping will be fine, and there are lots of intercoolers to choose from with that size. If your going blow through, copy what bcmurphy has done, it seems to be working great so far.

[BobtailedSnail]

Originally Posted by djuosnteisn My intake is pull through, like normal... just much much larger. That's a big fucking turbo your talking about lol. Fuel should be your #1 concern IMO. The rest will be easy, hahaha. 2.5" IC piping will be fine, and there are lots of intercoolers to choose from with that size. If your going blow through, copy what bcmurphy has done, it seems to be working great so far.

yeah it is very huge and with prolly be set up for drag alone and with the custom Intake manifold that SilverDemon is heading up it was discussed about a possible additional port injection incorporated into the IM.

EDIT: not trying to hack this into a IM/fueling thread lol

[Tomas]

Had a lot of fun today putting together a 4" intake with MAF screen.
Stock location. Braille light weight battery with DIY mount. Shit is tighter than taliban pussy but it fits.
Vehicle would not start after install of course. This is me not thinking things through as usual . So after pondering whether to put back the old Cobb SRI and getting a reasonable MAF table or doing something to jig it I decided to just use some masking tape to restrict the flow till I could get the car to idle. Fucking LULZ! It worked. After I got home from the shop I had to increase my MAF table 4 times 25% before I could completely remove all of the tape. I kept widening the opening after every revision till I was able to get the car to idle with STFT and LTFTs within +/- 10. hahaha. Fun times.

My maf curve goes to 925 gs now. hehe.
Not sure how the maf screen will work. I'll start calibrating some time this week,

[crazyp]

some sick shit right there lol, nice

[Dano]

Lol

Nice tape job.


Tappin

[86AmishMs3]

Originally Posted by Tomas Had a lot of fun today putting together a 4" intake with MAF screen. Stock location. Braille light weight battery with DIY mount. Shit is tighter than taliban pussy but it fits. Vehicle would not start after install of course. This is me not thinking things through as usual . So after pondering whether to put back the old Cobb SRI and getting a reasonable MAF table or doing something to jig it I decided to just use some masking tape to restrict the flow till I could get the car to idle. Fucking LULZ! It worked. After I got home from the shop I had to increase my MAF table 4 times 25% before I could completely remove all of the tape. I kept widening the opening after every revision till I was able to get the car to idle with STFT and LTFTs within +/- 10. hahaha. Fun times. My maf curve goes to 925 gs now. hehe. Not sure how the maf screen will work. I'll start calibrating some time this week,

haha did you fail geometry in highschool? Should have made a scaled maf cal first based on the squared ratio of ID's

[Tomas]

Originally Posted by 86azms3 haha did you fail geometry in highschool? Should have made a scaled maf cal first based on the squared ratio of ID's

Highschool? I barely passed kindergarten. And that was only cuz I let my priest teacher fondle my wee wee.