Had a productive afternoon. Debadged the tail end of the 'ol girl (both the MAXIMA and the NISSAN emblem) Kinda thinking maybe it needs the NISSAN emblem....

Then I got the itch to make a BOP. Made the left(drivers) side and installed it. Had a pieace of 1/4" diamond plate laying around. Went smooth as budd'ah. Gonna make another out of 1/4" smooth AL when I have time to pick up some. The chrome diamond plate screams...LOOK, I VOIDED MY WARRANTY! I know I can paint it black but that will still stick out like a sore thumb. I didn't clear the ECU and I fought the eurge to get pushed back into the seat. I want to see what 1 BOP will do then I'll make and install the right side BOP.

I was thinking over the 2hrs it took to make and install the BOP that could you install a second air intake on the right side??? I know it would need a mass air flow sensor and a throttle plate but can you have have 2? It could open up around a little over half throttle on to WOT. Maybe that degree in mechanical engineering will pay off after all...

What do you guys that know more about ECU cars than me, is that possible? It could be like a tri-powered carb setup...with progressive linkage

 

yea, It is possible for this engine to have two air intakes. I am sure as you know the final years of the g35 sedan had dual MAF and intakes along with dual throttle bodies. My concern would be it will be a whole lot more of an issue and time consuming to get a working ECU to recognize the dual set up. Not saying impossible.... but if you do decide to test your engineering degree, this will definitely be an under taking! Go for it dude and let us know how it works out. I am sure you could source some engine components off of a G35 that some young tool box put around a tree.

 

Thanks for the help! Off hand, I don't know much about newer cars electronics. I'm an old muscle car hot rodder...back before computers were even on a desk much less a car.

 

The ECU is learning fast. I had no drop in MPG after I installed the left BOP and did not clear the computer. MPG seem to have improved and the drop in low RPM torque is getting less noticeable. Throttle response is awesome from 30 MPH and up. Kicked her from around 65MPH to 100 in about 1.5sec or less.

 

65mph to 100 in 1.5 sec or less??? Thats not possible sorry.

 

I know...it just felt like it

 

loll, im not gonna lie 100 comes so quick (Thats what she said) so I cant imagine how much better it feels with BOP's.

 

Been through half of a tank of fuel since installing the one left BOP and it looks like my avg MPG has gone from 21.4 to 23.5 MPG

 

curious, what is the VIAS assembly doing right now since you put on only one BOP? Is it still half-working?

are you expecting further gains from a second BOP?

to be honest i thought putting on just one wouldn't work or break something, so im curious what the second BOP will do to your install

 

I need to pop the hood and watch the VIAS to see what it's up to. I assume it's still working...but u know what they say about assuming

I'm not expecting much difference after removing the 2nd VIAS since the right one is the smaller assembly. I would not b surprised if removing the smaller hurts my low end torque tho. That was the whole point of this experiment...to see what does what...

What did you think would break with just 1 BOP?

All this BOP'n has gotten me thinking about a custom AL intake manifold...that would be a hell'of-ah weekend project huh?

 

I figured the air had to pass through both for the VIAS to work at all and that one would mess that up somehow. Obviously you know quite a bit more about engines than I do, good luck with your project I'm curious what the second one will do.

Custom intake manifold? Lol again good luck this is something I'd only trust a pro with

 

I think it's safe to say the one BOP(left) has produced an avg MPG gain of 2 with no ECU clearing. When I have time i'm going to make and install the other(right) BOP and still not clear the ECU and see what happens. oh and BTW the diamond plate is gone, replaced with an 1/8" FLAT AL plate painted flat black

 

looks great. i commend a fellow fabricator

 

in about 1.5hrs I removed, made and installed the BOP on the harder side(right). I was very surprised at how smooth it went. The butt dyno was much more of a letdown tho. I first drove it around town for about 10min then got on the HWY and I accelerated kinda hard to merge and it felt wimpy and mushy. I know the ECU has to learn but my 1st impression is that BOP is not needed....only time will tell.

 

looks good again. im not butt hurt by the redesign at all.

 

The second BOP(right side) def hurt the low end torque big time. City MPG seems to have taken a nose dive but Hwy MPG seems better. Still gonna continue to let the ECU learn before I change anything.

 

been about a tank and a half now with the 2nd BOP and it looks like the MPG has leveled off at about +4 increase in combined city/HWY driving. Still feel the low end bog (which I hate). I might give it another tank full and if the low end torque doesn't improve, I will clear the ECU.

 

is the loss that noticeable to hate?

 

I second this quote.. I'm looking for gains, no doubt, but I don't want to get in the Max to go to Home Depot and it feels like i'm driving my 5cyl H3..

 

the lose is getting better. I'm still not convinced the right valve should be removed. if you do a lot of highway driving, removing both seems to be the best option but if you do a lot of city driving, just the left valve should be removed is what i'm thinking right now. I will clear the ECU soon and see what happens. Just give me a little more drive time and I'll update.

 

ok, something weird is happening now. been through another tank and a quarter and as the ECU seems to be learning more it looks like my MPG is dropping a little. Low end torque is getting better tho.

 

Understand, the ECU's adapt to your driving. If ur mashing, it is always going to be ready to go. If ur cruising, it is going to be sluggish. I realize this with my stock Max. It takes some serious beating for the car to be Peppy again and since I do a lot of highway miles, its constantly sluggish.

 

My concern and im not genius by any means with only one BOP is that the side with the VIAS will get most of the air going into the manifold. By creating that restriction(Valve) the air moves faster which causes us to get low end torque(faster response). So by getting more air to VIAS side of intake, it will PROBABLY cause the other side(no valve) to run leaner and require ECU to dump more fuel to compensate. No way to know for sure unless data logging of all cylinders EGT's. This is my assumption.

Without the VIAS all together, highway driving is great due to no restrictions in the manifold. I'm going to fab a CAI and purchase BOP and that should make it fly like a bat out of hell. But only when i find the a company that can tune in my area.
Once again, my assumptions.

 

Great job OP

 

I think it's safe to say I have lost 1 mile per gallon as the ECM has learned about the changes. I'm averaging about 21 miles per gallon. what do you guys think, should I clear the ecm?

 

yes

 

Even without a tune it will fly like a bat out of hell. I'm waiting to see if headers are made available in the next 6 months before I personally look at a tune

 

cleared the ECU and haven't really had much drive time yet but I think the weak low end torque is better and the MPG took a slight hit. I don't see any other improvements as of yet.

 

looks like it has leveled off at around 23MPG avg. The results are a little skewed because I put a K&N filter in about half way through the tank

 

wish I hadn't clear the ECU. I don't see any improvement in perf and now my MPG is going south and I added a K&N filter....

 

I was looking at http://x.nissanhelp.com/forums/Knowl...html?catid=160 and saw a bulletin about the ECU not learning and it said to unplug the mass air flow sensor while the engine is running and wait for a code then plug it back up. Anyone know anything about this? If you cause a error code, don't you have to clear the ECU to clear the code out? I don't think mine is learing very well...it's learing impaired!!

 

nice and there is no way to do a dual manifold unless u get the harness from a HR motor ....but good luck with that ur better off redesigning a bigger SINGLE manifold as the kinetix manifold gives the vq35 a 50whp+

 

are you talking about my last post on here? about unplugging the MAP?

 

This is a copy and paste of the bulletin I was talking about. Does anyone know what the MIL (P0102 or P010C) is? I assume it's the error codes.


INTAKE AIR VOLUME LEARN WILL NOT COMPLETE
APPLIED VEHICLES: All APPLIED DATES: 2007 - 2012
SERVICE INFORMATION
If IAVL will not complete using CONSULT:
a. While the engine is running, disconnect “Mass Air Flow” (MAF) sensor for 10-15 seconds until MIL (P0102 or P010C) comes on, and then reconnect before performing “Intake Air Volume Learn” (IAVL).
􀂾 If vehicle has two MAF sensors, disconnect only one in prior step and leave the second one connected; then reconnect.
􀂾 Engine may stop running when idle reduction occurs. Reconnect MAF sensor and continue to step “b”.
NOTE: If P0102 or P010C were not stored when DTC was confirmed, repeat step “a” until idle is reduced.
a. Clear any DTC’s that may have set during MAF disconnect.
b. Perform IAVL.
c. Confirm that idle is now within specification for model and year of vehicle being worked on.

 

 

 

 

How did the one BOP ever workout throughout the years? Because of this article I actually took off the bigger BOP and have been ruining just one for about 3-4 months. It does seem to have gained back some lower end power but not really sure if it has any adverse effect on the car

 

This thread is fail.