5th Generation Maxima (2000-2003) Learn more about the 5th Generation Maxima, including the VQ30DE-K and VQ35DE engines.

big maf tuning

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Old Aug 17, 2010 | 01:51 PM
  #161  
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Got the AEM UEGO for 170 shipped brand new on ebay.
Old Aug 17, 2010 | 02:10 PM
  #162  
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not doing this mod just learning.Here is a link to a place where i just got hoses for my '09 i noticed they have upto 8" dia and connectors for those of you looking for larger intake tubing and adapters.
http://www.hiprospeed.com/
Old Aug 17, 2010 | 02:38 PM
  #163  
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Once upon a time people said catbacks don't do anything at all for our car. Then came the dyno proven results of Cattman's 3" system.

Now we see the increase of performance with the BBMAF, after I read up a little people said boring out the TB's wouldn't make any difference as well, so shouldn't all three mods in conjunction = basically pure awesomeness and super WHP?
Old Aug 17, 2010 | 02:49 PM
  #164  
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I remember those days..... but ur about right with all of the above it should be like sex
Old Aug 18, 2010 | 06:18 AM
  #165  
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Instead of 'boring it out' (TB), maybe we should fine a compatible unit that's larger, say from a Mustang or something.
Old Aug 18, 2010 | 09:23 AM
  #166  
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Originally Posted by NmexMAX
Instead of 'boring it out' (TB), maybe we should fine a compatible unit that's larger, say from a Mustang or something.
Would finding a compatible TB be easier for Drive-by wire or Drive by cable applications?
Old Aug 18, 2010 | 10:03 AM
  #167  
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This looks interesting.
Old Aug 18, 2010 | 10:08 AM
  #168  
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Originally Posted by NmexMAX
Instead of 'boring it out' (TB), maybe we should fine a compatible unit that's larger, say from a Mustang or something.
Originally Posted by McSteve
Would finding a compatible TB be easier for Drive-by wire or Drive by cable applications?
5.5gen+ guys will have the most trouble finding an application. I know SGmotorsports used a 90mm chevy TB for their 350z with custom IM, but that car is far from stock as far as electronics go.

Us 5th gens and our 4th gen couterparts have it way easier. The mustang TB has already been done. The hardest part for us is finding a way to mount the TB to the intake manifold...
Old Aug 18, 2010 | 11:25 AM
  #169  
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Originally Posted by tedo007
TBW Mustang units seem to be almost a direct fit.
Old Aug 18, 2010 | 11:49 AM
  #170  
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$300 for a tb O_0! However 70mm is a lot more than I could do with a drill press probably. That's like .8cm bigger than our OD isn't it?

EDIT: ohhh stock replacement tho... soooo a junkyard spare one + some machining time = big@$$ TB yeeees?

EDIT 2: Ahhh yes car-parts.com has some for $75.... sounds A LOT better!

Last edited by McSteve; Aug 18, 2010 at 11:53 AM.
Old Aug 21, 2010 | 09:02 PM
  #171  
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track should be happening on thursday, the only difference is i have a34 Nismo wheels now so i got more weight so my times may drop. for the record the setup isnt as light as people make it seem. total of 48 lbs with re40a tires. still running this crappy air filter though . money is getting tighter
Old Aug 23, 2010 | 06:29 AM
  #172  
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Originally Posted by rayac88
track should be happening on thursday, the only difference is i have a34 Nismo wheels now so i got more weight so my times may drop. for the record the setup isnt as light as people make it seem. total of 48 lbs with re40a tires. still running this crappy air filter though . money is getting tighter
That's horrible. 19" diameter wont help either.

My MMEV5's were 52#'s w/tire in 18" trim,
Old Aug 23, 2010 | 07:31 AM
  #173  
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Originally Posted by rayac88
track should be happening on thursday, the only difference is i have a34 Nismo wheels now so i got more weight so my times may drop. for the record the setup isnt as light as people make it seem. total of 48 lbs with re40a tires. still running this crappy air filter though . money is getting tighter
love those A34 nismo's loose at least the 2 fronts
Old Aug 28, 2010 | 05:27 PM
  #174  
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no luck on the 1/4 mile details. the track was flooded out so no results with that.
Old Nov 8, 2010 | 10:36 PM
  #175  
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time to reopen this thread i still have some questions.
i ran a 15.8 on my 1/4, 10.3 on 1/8, 2.5 60ft... does anyone have stock 3.0 at times i can compare to?
w/ the 3.5" intake aem dryflow i feel like its taking my torque away. i have my narr lvt tuned @+39 idle then taper down to from 20 to about 8 after 1800rpm til hvt switchover. my a/f reads avg 0f 13.4 up top n 14.7 til oovi kicks in.
my pressure reading says its about 5psi until the engine hits 4500k ad shoots up to 9psi, thats WOT. i set my intake pressure scale to 0%. whats is everyone else reading out?
any advice on gaining better speed down low?
i ran w/ 17x8 41lbs total wheel weight in front and a34 nismos in back
Old Nov 9, 2010 | 12:20 AM
  #176  
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Get your 60 foots down, try dropping the tire pressure.

Your AFR is too lean, shoot for 12.9-13.1. What's your AFR like at idle? Is it consistent? How about part throttle and cruising?

Those A34s are light for their size, actually. Track-wise, if you wanna get off the line faster, you can run smaller wheels up front (16" or 15") and as long as you can make it stick you'll be quicker down low.
Old Nov 9, 2010 | 04:09 AM
  #177  
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I don't have a lot of details on times but my auto 5th gen ran a 15.0@93 with an ebay cold air intake and greddy evo 2 exhaust... that's all I had, I've been to the track maybe 3 times with that car, never went as low as 15.8 though
Old Nov 9, 2010 | 12:21 PM
  #178  
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Originally Posted by MoncefA33
Get your 60 foots down, try dropping the tire pressure.

Your AFR is too lean, shoot for 12.9-13.1. What's your AFR like at idle? Is it consistent? How about part throttle and cruising?

Those A34s are light for their size, actually. Track-wise, if you wanna get off the line faster, you can run smaller wheels up front (16" or 15") and as long as you can make it stick you'll be quicker down low.
my a/f is 14.4 - 15.2 on idle w/ the bbmaf cruising 14.7 and 13.5 partial
i dont have a problem with launching and thats whats got me stumped. a quick chirp and im off, everyone hear talks about getting the launch and even flooring it i get a chirp or two then im off.
ever since i got my WS ypipe my torque has really dropped so im debating if i should go back to stock.
i have had a lot of front end problems recently but nothing that should affect my speed.
Old Nov 10, 2010 | 04:20 AM
  #179  
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Originally Posted by rayac88
my a/f is 14.4 - 15.2 on idle w/ the bbmaf cruising 14.7 and 13.5 partial
i dont have a problem with launching and thats whats got me stumped. a quick chirp and im off, everyone hear talks about getting the launch and even flooring it i get a chirp or two then im off.
ever since i got my WS ypipe my torque has really dropped so im debating if i should go back to stock.
i have had a lot of front end problems recently but nothing that should affect my speed.
How'd you figure your TQ dropped???
Old Nov 10, 2010 | 04:28 AM
  #180  
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Originally Posted by Grand_hustle17
How'd you figure your TQ dropped???
Old Nov 10, 2010 | 05:21 AM
  #181  
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Im willing to bet the **** had suttn to do with this smmfh!

Last edited by Grand_hustle17; Nov 10, 2010 at 05:35 AM.
Old Nov 10, 2010 | 05:25 AM
  #182  
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Originally Posted by rayac88
i have my narr lvt tuned @+39 idle then taper down to from 20 to about 8 after 1800rpm til hvt switchover.
You're probably pulling alot of timing... That could be the reason it feels like your TQ dropped.
Old Nov 10, 2010 | 08:26 AM
  #183  
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Originally Posted by essential1
You're probably pulling alot of timing... That could be the reason it feels like your TQ dropped.
I say he needs to stop listening to his ****......
Old Nov 10, 2010 | 08:35 AM
  #184  
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Butt dyno FTL,

Get it on a dyno and look at the shape of the curve. A y-pipe adds torque. But adding fuel through the VAFC pulls timing since it bends the MAF signal.

At this point honestly toss the VAFC and get an SAFC2 or e-Manage Blue/Ultimate, it'll make your task a lot easier and make more power.
Old Nov 10, 2010 | 10:21 AM
  #185  
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Originally Posted by MoncefA33
Butt dyno FTL,

Get it on a dyno and look at the shape of the curve. A y-pipe adds torque. But adding fuel through the VAFC pulls timing since it bends the MAF signal.

At this point honestly toss the VAFC and get an SAFC2 or e-Manage Blue/Ultimate, it'll make your task a lot easier and make more power.
This ^^^... and preferably when you post anything about HP, TQ, or tune, please leave your **** out of it... it makes things more complicated and its a good way to wreck your ride and mind
Old Nov 10, 2010 | 07:49 PM
  #186  
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once i put the y-pipe on i noticed my acceleration down low had dropped horrifically but after time it corrected slightly. then i put the bbmaf on i may just ditch the vafc2 and go to a neo of SAFC. i cant see myself spending much more money on this car, but i do want it running right.
i will start leaving my **** out of it... i didnt consider since i had to tune the idle that it would effect my timing. if i found a way to advance my timing 17 degrees would that help or should just go for the SAFC? the NEO has the 1in17out setting right?

Last edited by rayac88; Nov 10, 2010 at 07:53 PM.
Old Nov 11, 2010 | 03:01 AM
  #187  
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Idk about the neo
Old Nov 11, 2010 | 06:38 PM
  #188  
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i just bought a neo is has setting up to 26in/out so im hoping this will take care of it. all the wires are the same color from the vafc2 so ii think i dont have to re-splice everything just unclip the extended harness and connect it to the NEO. but im going to quadrouple check it before i do that.
Old Nov 22, 2010 | 02:32 PM
  #189  
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the neo is not a direct harness swap i had to rewire it. it was too easy to tune i set it 1-17 and tuned it with a handful of runs... i think the vafc tuned so much for idle affected my fuel pump cuz when i go into gear now the revs drop low and sometimes it stalls.
Old Nov 22, 2010 | 03:21 PM
  #190  
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Nice to know that the sensor type settings are the same on the SAFCII and NEO for a larger MAF (1 IN 17 OUT). No one seemed sure about that before. Only problem is if I ever decide to get a bigger MAF, I'll have to get rid of the VAFCII I just bought ... Oh well, I'll probably never go for a BBMAF...
Old Nov 22, 2010 | 04:44 PM
  #191  
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i will work with the vafc2 but you got to tune for more gas. i havent been to the track to see the difference in times between the vafc and the neo... i dont really know if there will be a difference.... maybe in my 60ft times
Old Jan 20, 2011 | 05:13 PM
  #192  
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well im bumping this thread.
i changed my valve covers today and when i put everything back together and started the maxima up it started to run lean. around 18.8 a/f ratio. so i looked around to see if things werent connected correctly but everything was good. so i decided to mess with the sensor type on my NEO. it was at 1 and 17 then i put it to 1 and 1 and it was running even leaner.
i changed it to 1 and 4 WOT was about -8 points. now it is at -12 from about 3500 rpm. with my previous settings everything before the VI kicked in was 14.7 until The VI hit and then it gave me the ability to tune. now i can tune it from anywhere as long as im in WOT. At WOT before the VI kicks in the a/f is around 13.8 which i never saw under 4k rpm.
do any of you experts have any idea why that happened?
Old Jan 30, 2013 | 10:06 PM
  #193  
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Originally Posted by rayac88
well im bumping this thread.
i changed my valve covers today and when i put everything back together and started the maxima up it started to run lean. around 18.8 a/f ratio. so i looked around to see if things werent connected correctly but everything was good. so i decided to mess with the sensor type on my NEO. it was at 1 and 17 then i put it to 1 and 1 and it was running even leaner.
i changed it to 1 and 4 WOT was about -8 points. now it is at -12 from about 3500 rpm. with my previous settings everything before the VI kicked in was 14.7 until The VI hit and then it gave me the ability to tune. now i can tune it from anywhere as long as im in WOT. At WOT before the VI kicks in the a/f is around 13.8 which i never saw under 4k rpm.
do any of you experts have any idea why that happened?
Samething is happening to me ever since I installed nwp spacers and new valve cover. What's going on? It idles at 17.0 to 18.0
Old Jan 31, 2013 | 08:47 AM
  #194  
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It sounds like an obvious vacuum leak as air is getting in unmetered and causing a lean condition. Look for vac leaks, and if you need to go back and check everything.
Old Jan 31, 2013 | 08:54 AM
  #195  
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Thanks bro. Me and mechanic friend went over it and it seems like the kinetix manifold does not line up that good with the nwp spacer and I may need to make an additional spacer out of cork car will go under the scissors ASAP. Lol
Old Jan 31, 2013 | 08:55 AM
  #196  
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Is it safe to drive like this by the way?
Old Jan 31, 2013 | 09:18 AM
  #197  
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Seems a little lean to me. What are your normal driving AFR's?
Old Jan 31, 2013 | 09:20 AM
  #198  
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Need a pinout for the MAFS on the VQ35DE, assistance?
The FSM's I've checked give pins that don't seem to be correct, looking for verification
Old Jan 31, 2013 | 09:31 AM
  #199  
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What do you need?
Old Jan 31, 2013 | 09:31 AM
  #200  
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Originally Posted by nmexmax
seems a little lean to me. What are your normal driving afr's?
14.7 15.1



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