Butt Dyno with my 3'' MAF
#1
Butt Dyno with my 3'' MAF
Well my mods are in my sig... I have a custome CAI, i relocated my battery made a hole in the area where the batter use to sit and the filter SITS right behind my driver fog light. ANYWAYS... I built a CUSTOM 3'' MAF, SS with a flange and all, threw it on , and the cars idle was a bit rough to begin with... i drove thecar about 200 miles and now its fine.
Ok the cars throttle response is SOOO much better, just tapping on the gas the car launches forward ! HIGH END is CRAZY ! the cars runnign SOOO much better, it pulls like crazy up top, im able to break tires after 4.5k in 2nd when i smash it.
1 thing i noticed is that my exhasut is POPING alot more, it has the cracking sound from it everytime i let off.
Ok the cars throttle response is SOOO much better, just tapping on the gas the car launches forward ! HIGH END is CRAZY ! the cars runnign SOOO much better, it pulls like crazy up top, im able to break tires after 4.5k in 2nd when i smash it.
1 thing i noticed is that my exhasut is POPING alot more, it has the cracking sound from it everytime i let off.
#4
Originally Posted by NiSmOVQ35
1 thing i noticed is that my exhasut is POPING alot more, it has the cracking sound from it everytime i let off.
#5
Originally Posted by Red Lion
might be spitting fire. When my car ran pig rich with no cat, I'd spit flames occasionally. Yours might be running rich due to lack of a/f adjustment?
#7
"I installed a larger MAF without reading or ignoring the countless posts that told me I am supposed to re-tune my AFR. But hey, they're only pistons."
1. NiSmOVQ35
2.
I expect this list to grow quickly.
1. NiSmOVQ35
2.
I expect this list to grow quickly.
#8
How do yo know i didnt do my research ?
Do you know my plans ? what im ganan do next etc ?
NO.
THe guy whose going to be tunning my car has a nice little list of people ahead of him, currently im putting on all my bolt ons b4 i get it tunned. Im not worried about blowing my motor, cuz its in the body shop till vinney ten is ready to tune my car.
i just wanted to share how it felt after the 3' MAF, my car HAS been runnign EXTREMELY RICH, being able to tell via my aem ugeo, now WITH the 3' maf YES it has less rich but not to lean.. where as my pistons would go.
Thank you.. have a nice day
Do you know my plans ? what im ganan do next etc ?
NO.
THe guy whose going to be tunning my car has a nice little list of people ahead of him, currently im putting on all my bolt ons b4 i get it tunned. Im not worried about blowing my motor, cuz its in the body shop till vinney ten is ready to tune my car.
i just wanted to share how it felt after the 3' MAF, my car HAS been runnign EXTREMELY RICH, being able to tell via my aem ugeo, now WITH the 3' maf YES it has less rich but not to lean.. where as my pistons would go.
Thank you.. have a nice day
#11
Originally Posted by NiSmOVQ35
How do yo know i didnt do my research ?
Do you know my plans ? what im ganan do next etc ?
NO.
THe guy whose going to be tunning my car has a nice little list of people ahead of him, currently im putting on all my bolt ons b4 i get it tunned. Im not worried about blowing my motor, cuz its in the body shop till vinney ten is ready to tune my car.
i just wanted to share how it felt after the 3' MAF, my car HAS been runnign EXTREMELY RICH, being able to tell via my aem ugeo, now WITH the 3' maf YES it has less rich but not to lean.. where as my pistons would go.
Thank you.. have a nice day
Do you know my plans ? what im ganan do next etc ?
NO.
THe guy whose going to be tunning my car has a nice little list of people ahead of him, currently im putting on all my bolt ons b4 i get it tunned. Im not worried about blowing my motor, cuz its in the body shop till vinney ten is ready to tune my car.
i just wanted to share how it felt after the 3' MAF, my car HAS been runnign EXTREMELY RICH, being able to tell via my aem ugeo, now WITH the 3' maf YES it has less rich but not to lean.. where as my pistons would go.
Thank you.. have a nice day
btw, it's "tuned," not "tunned."
#12
Originally Posted by irish44j
wow, a 3-foot MAF? that's sick!
btw, it's "tuned," not "tunned."
btw, it's "tuned," not "tunned."
#13
Originally Posted by NiSmOVQ35
sorry my grammer wasnt up to your standards .. and you had to be mr. wise ***? what are you a english teacher ?
Just thought you might want to know the correct spelling since it's in your sig....
#21
no guys sorry i dont have data, the only bit of info i can share is the car went from runnign PIG rich to Less pig rich it went toward being a lil lean but nothing major, i examined that from my aem wideband. I will dyno the car soon, but i wont be able to tell you what the 3" maf did for me on paper since i have many mods i havent dynoed.
lemme get a pic this week and throw it up =), this will also show my custom intake.
lemme get a pic this week and throw it up =), this will also show my custom intake.
#22
Originally Posted by NiSmOVQ35
no guys sorry i dont have data, the only bit of info i can share is the car went from runnign PIG rich to Less pig rich it went toward being a lil lean but nothing major, examined that from my aem wideband.
Originally Posted by NiSmOVQ35
I will dyno the car soon, but i wont be able to tell you what the 3" maf did for me on paper since i have many mods i havent dynoed.
#24
For stock software'd A33B's, yes it is. I've never seen an 04 A34 AFR, so I cannot comment about those. But on the Altima forum, it seems as if they're about 12.5 ish with the addition of stock WB's (05+). I would imagine it's the same for 05+ A34's.
#25
Guest
Posts: n/a
Originally Posted by NmexMAX
Never a good thing for comparisons, but all too common around here. I am in the same boat as the only base run that I have is headers and everything else completely stock. That and my dyno wasn't the most informative since I pretty much didn't know much about dynoing an auto.
#26
hey whats up guys....
for some reason no matter how much fuel i take out from my SAFC, my wideband shows similar readings, and currently im running more towards the rich side. (12.8-13.1)
So im thinking, with this larger MAF 3", will this correct a bit better? since im guessing larger MAF, more air, run more lean, and maybe it'll put me on the 13's on my A/F...? Correct me if im wrong.
for some reason no matter how much fuel i take out from my SAFC, my wideband shows similar readings, and currently im running more towards the rich side. (12.8-13.1)
So im thinking, with this larger MAF 3", will this correct a bit better? since im guessing larger MAF, more air, run more lean, and maybe it'll put me on the 13's on my A/F...? Correct me if im wrong.
#27
Exactly ho much are you taking out (%)? Also, are these numbers (12.8-13.1) when WOT?
You're making out to seem as if the ECU cannot compensate fast enough. But this is what's REALLY happening.
Post # 6 of this very thread
Originally Posted by Maximus_95
since im guessing larger MAF, more air, run more lean,
Post # 6 of this very thread
Originally Posted by nismology
Larger MAF housings make the AFR more lean due to the reduced velocity of the air passing over the hot wire.
#28
Originally Posted by NmexMAX
Exactly ho much are you taking out (%)? Also, are these numbers (12.8-13.1) when WOT?
Yes, those readings are showing under WOT....
i was taking out about for instance 14% before and reading 12.8 so i have decided to take out about 16%-17% and it still reads the same.
#29
Originally Posted by Maximus_95
Yes, those readings are showing under WOT....
i was taking out about for instance 14% before and reading 12.8 so i have decided to take out about 16%-17% and it still reads the same.
i was taking out about for instance 14% before and reading 12.8 so i have decided to take out about 16%-17% and it still reads the same.
#30
Originally Posted by 95BLKMAX
Does it still do that thing that once you go above -"X"% correction the a/f all of a sudden jumps from ~13.1 to mid 14s?
but my main concern is that it feels like my SAFC is not able to take out anymore fuel, no matter how much % i take off, ill still be running at around 12.8-13.1 or so. i've tried taking out as much as 22% before, but no change either.... its very hard for me to get my a/f to read at a steady 13.5. i also dont want to overdo it, because im afraid that it might catch on and cause my car to go superlean and mess something up.
#31
Originally Posted by Maximus_95
it does that sometimes.... i actually noticed one thing today is when i was at high rpms, my a/f read super lean like 18's for a split second then dropped to 12.8ish when i was on WOT.
but my main concern is that it feels like my SAFC is not able to take out anymore fuel, no matter how much % i take off, ill still be running at around 12.8-13.1 or so. i've tried taking out as much as 22% before, but no change either.... its very hard for me to get my a/f to read at a steady 13.5. i also dont want to overdo it, because im afraid that it might catch on and cause my car to go superlean and mess something up.
but my main concern is that it feels like my SAFC is not able to take out anymore fuel, no matter how much % i take off, ill still be running at around 12.8-13.1 or so. i've tried taking out as much as 22% before, but no change either.... its very hard for me to get my a/f to read at a steady 13.5. i also dont want to overdo it, because im afraid that it might catch on and cause my car to go superlean and mess something up.
SAFC should be more than enough to take out up to 50% fuel, so thats not it. There's something else going on... that something else is whats been bugging you for months now, lol. Just like my ignition timing
#34
Originally Posted by 95turbo gxe
I would like to see a pic of a 3inch maf or better yet a custom 3inch maf
Post #76 and down
Right now its got a coat of silver paint, and a filter on it
#35
ok I got ya im wondering how well it would work with a z32 Maf. I would use some 3ich steel pipe and fit the sensor into it. How would it affect timing?
Also im boosted with 555cc injectors what would be the gains for me doing this and would thier be any power increase?
Also im boosted with 555cc injectors what would be the gains for me doing this and would thier be any power increase?
#36
Originally Posted by 95turbo gxe
ok I got ya im wondering how well it would work with a z32 Maf. I would use some 3ich steel pipe and fit the sensor into it. How would it affect timing?
Also im boosted with 555cc injectors what would be the gains for me doing this and would thier be any power increase?
Also im boosted with 555cc injectors what would be the gains for me doing this and would thier be any power increase?
- 70mm MAF (A32) reads say 78.9% airflow on my 3.5, this exerts theoretical load value X to curve ignition timing in a certain way
- 75mm custom MAF (my rig, lol) reads 58.6% airflow, this exerts a LESSER theoretical load value than X, and thus curves ign timing to allow for more timing
In your case being boosted, thats a bad thing obviously. However, (and excuse me for not knowing if you have said so before, must have missed it) if you have an SAFC/ E-Manage, you can select the MAF to be read, so instead of using the A32 MAF input curve, you can use the Z32 input MAF curve (that MAF is 75mm ID, and a 3" ID pipe= 76.5mm, close enough) so that it should not affect your timing to a noticeable degree, because the ECU will think it has the right MAF.
I know I wrote it a bit confusing at the end there, lol. I understand my geberish, I just hope you guys can make sense of it,
#37
Originally Posted by 95BLKMAX
Ok the way I understand this theory... lets use stock ECU (no SAFC) as an example...
- 70mm MAF (A32) reads say 78.9% airflow on my 3.5, this exerts theoretical load value X to curve ignition timing in a certain way
- 75mm custom MAF (my rig, lol) reads 58.6% airflow, this exerts a LESSER theoretical load value than X, and thus curves ign timing to allow for more timing
In your case being boosted, thats a bad thing obviously. However, (and excuse me for not knowing if you have said so before, must have missed it) if you have an SAFC/ E-Manage, you can select the MAF to be read, so instead of using the A32 MAF input curve, you can use the Z32 input MAF curve (that MAF is 75mm ID, and a 3" ID pipe= 76.5mm, close enough) so that it should not affect your timing to a noticeable degree, because the ECU will think it has the right MAF.
I know I wrote it a bit confusing at the end there, lol. I understand my geberish, I just hope you guys can make sense of it,
- 70mm MAF (A32) reads say 78.9% airflow on my 3.5, this exerts theoretical load value X to curve ignition timing in a certain way
- 75mm custom MAF (my rig, lol) reads 58.6% airflow, this exerts a LESSER theoretical load value than X, and thus curves ign timing to allow for more timing
In your case being boosted, thats a bad thing obviously. However, (and excuse me for not knowing if you have said so before, must have missed it) if you have an SAFC/ E-Manage, you can select the MAF to be read, so instead of using the A32 MAF input curve, you can use the Z32 input MAF curve (that MAF is 75mm ID, and a 3" ID pipe= 76.5mm, close enough) so that it should not affect your timing to a noticeable degree, because the ECU will think it has the right MAF.
I know I wrote it a bit confusing at the end there, lol. I understand my geberish, I just hope you guys can make sense of it,
#38
Originally Posted by 95turbo gxe
Yes Im using a eu. But I guess with it only being a 1.5mm differance I wont see any power gains. Correct me if Im wrong
Keep in mind the ID of the intake tubing, with me it used to be...
3" cone> 70mm MAF (2.75ish)> 3"midpipe> 3" (75mm) TB OPENING (happy NMexMax? )
The MAF itself acts like a restrictor in a way, so when you do a 3" MAF, it keeps the ID of the intake piping at 3". I cant even guess as to what #s it would yield on a boosted applications, but im sure the response improvement is going to be noticeable throughout the powerband.
Its evident to me daily driving, WOT its obvious on the top end. You boosted probably flow as much air at X partial throttle as I do at WOT, so I'd only assume that your gains would be ubber, but only dyno will tell.
#39
Originally Posted by 95BLKMAX
Oh yes you will, from the share improvement in airflow by itself. Im not sure how evident it would be under boosted conditions, but from my buttdyno (and real dyno) I got 10whp at redline from this, and better respsonse.
Keep in mind the ID of the intake tubing, with me it used to be...
3" cone> 70mm MAF (2.75ish)> 3"midpipe> 3" (75mm) TB OPENING (happy NMexMax? )
The MAF itself acts like a restrictor in a way, so when you do a 3" MAF, it keeps the ID of the intake piping at 3". I cant even guess as to what #s it would yield on a boosted applications, but im sure the response improvement is going to be noticeable throughout the powerband.
Its evident to me daily driving, WOT its obvious on the top end. You boosted probably flow as much air at X partial throttle as I do at WOT, so I'd only assume that your gains would be ubber, but only dyno will tell.
Keep in mind the ID of the intake tubing, with me it used to be...
3" cone> 70mm MAF (2.75ish)> 3"midpipe> 3" (75mm) TB OPENING (happy NMexMax? )
The MAF itself acts like a restrictor in a way, so when you do a 3" MAF, it keeps the ID of the intake piping at 3". I cant even guess as to what #s it would yield on a boosted applications, but im sure the response improvement is going to be noticeable throughout the powerband.
Its evident to me daily driving, WOT its obvious on the top end. You boosted probably flow as much air at X partial throttle as I do at WOT, so I'd only assume that your gains would be ubber, but only dyno will tell.
#40
Originally Posted by 95turbo gxe
Yeah but remember im only going up 1.5mm in size! Do you think their would be a 5whp increse for me?