Community Member Credit: Rob T.
Community Member Credit: Unklejoe
I am working on a custom intake manifold (with a TON of help from a fellow engineer and friend) that is a rip-off of spark’s design. Basically, it will consist of a butchered stock 02 UIM with a custom plenum. I will use a 3.5″ aluminum bend with 3.5″ velocity stack on the plenum (to replace the elbow) as well as a 3.5″ MAF/Intake Pipe/Velocity Stack/Filter.
I also plan on running it with a GM 87mm DBW throttle body. This will give me a straight 3.5″ intake path.
Some people on the Titan and 350z forums have been able to run 87mm TB’s (like three people total) but the information is very scarce. Some people say that you need UPREV so that you can reflash the ECU to run the larger TB, but I do not believe that BS.
A couple of guys called “PGM” made a 90mm TB kit for the Titan a while back that used the Corvette TB and DID NOT require the use of UPREV; there was a small “conversion” box that was in line with the harness. This proves to me that it can be done. I can’t see there being anything too complex inside that little 1″ square box. Maybe an op-amp altering the value of the TPS signal…who knows.
Both the stock Nissan and the GM 87mm throttle bodies are made by Hitachi and use the exact same sensor and servo configuration.
One guy ran the 87mm GM tb on his 350z before with NO conversion box and NO reflash. It worked but he said there were “idle surge” problems. I believe that this can be corrected by following the idle relearn TSB procedure. I still need to do some research on how the TB motor is controlled (if the ECU uses feedback from the TPS or if the stepper motor is controlled directly).
We shall see. I will make it work and report back what I did (after I finish the manifold of course).
As far as pics:
The throttle body
Cutting the stock manifold
Cutting the stock manifold (again)
Final Product (I have a lot of work to do )
From NiZMo1o1
Small Update Started polishing the ports on the stock manifold and removing some excess material…
Also, here’s a pic of the parts (minus the sheet metal which was in the other room)
Community Member Credit: Caleb A.
This is a Holley EFI plenum adapter for the Gen2 VQ35DE gen de. I can get them made for the FWD DE, RWD DE, RWD HR and even the 3.7. I’ve got a lot invested in this and those who are interested in this you need to be 100% interested in doing it because it’s gonna cost you about 1200 in total for everything and you’ll need to cut your hood.
This will make a lot more power but will make a major difference in the higher RPMs. More specifically over 7k RPMs. This is a baller mod, for those who are serious and want to make serious power. The kit will consist of a lower adapter plenum upper plenum (Holley EFI 95mm) gm 90mm throttle body and a plug and play wiring harness for the throttle body. Dyno sheets will be up soon for direct comparison but you will need a tune to run this. This can fit a variety of cars if your willing to make it fit!
Updated 5.5.2021
Community Member Credit: Unklejoe
This is “version 2″ of my manifold. The previous design had the inlet coming in from the side and my car made 260whp with that setup. I re-designed it to have the inlet come in from the rear for better flow. I haven’t dyno’d the car on the second version of the manifold but the MAF voltage is slightly higher in the upper RPM’s indicating better flow.
The manifold is made from 1/8″ aluminum, all tig welded by a friend. The piping is 3.5” all the way. The throttle body flange is for a 2009 throttle body. This throttle body will work on the 02-08 as well, you’ll just need the harness. The 09 throttle body is better because it is 75mm as opposed to 70.
This fits on my 2002 perfectly and clears everything. I had to re-route some vacuum lines (obviously) because of where I made the vacuum ports. As far as throttle body placement, it works in my car, but PLEASE COMPARE PICTURES TO MAKE SURE IT WILL CLEAR EVERYTHING IN YOUR CAR. I had to move my battery to the trunk for the filter to fit. You could probably get away with a silicone bend right before the battery though.
Community Member Credit: Unklejoe
Cutting the stock manifold
Cutting the stock manifold (again)
Final Product (I have a lot of work to do )
From NiZMo1o1
Small Update Started polishing the ports on the stock manifold and removing some excess material…
Also, here’s a pic of the parts (minus the sheet metal which was in the other room)
If you want to add an easy 25WHP to your Altima or Maxima then look no further. Our SFR high-velocity manifold is an easy bolt-on and adds 25WHP to an NA car and up to 50WHP on turbo cars. We also offer an aluminum engine cover that goes with it to really dress up the engine We also offer the intake manifold for the later models Altimas and Maximas.
Nissan Club
I was fortunate enough to have the first SFR High-Velocity Manifold put on a N/A vq35. From what Tim at Speed Force Racing told me this manifold is slightly different from the manifold made for forced induction cars.
I have had the manifold for months. When I first received it I was impressed with what I saw. The design is wicked and looks waaaayyy better than stock. It took me a while to slap it on at first because I had to find and purchase the correct barb fitting to hook up the vacuum hoses. At first, the installation was a bit time-consuming because I didn’t know what I was doing. I have installed the manifold on and off about 6 times already so installation for me is under an hour.
The sound is pretty cool. At low revs during soft acceleration, you hear a humming/growl from under the hood. Under hard acceleration, the engine sounds great! it isn’t loud and obnoxious. It’s more of a deeper growl, nothing too crazy or far from stock, but noticeable.
At first, I could only go off of the butt dyno and my butt dyno liked what I felt. To me, the mid-range was increased a lot. I knew the torque was increased a lot (dyno showed 10wtq at peak). Up top, the car felt great as well. My car just easily pulled to higher RPMs. I could definitely feel the car breathing MUCH better. Even while cruising at lower RPMs the car had sooo much better response.
Here are some pics of what it looks like on my car:
Some graphs got mixed up at the shop but I managed to get the most important ones. The graph shows the highest dyno from the stock manifold with the highest dyno with the SFR manifold. the other graph has the highest stock vs. a couple runs with the SFR manifold but also shows the torques as well.
I picked up almost 30whp at redline alone.
I was amazed at how much power was picked up at redline. this isn’t your average SSIM dyno graph only showing gains up top. You can clearly see there are gains on the ENTIRE powerband. Peak rose 5whp (wish it was more). What’s important here is the area under the curve. midrange you can see ~12whp gains as well!
I like this manifold very much! yes, it’s not a cheap mod but for the overall power, it’s worth it. It adds power where cams don’t and cost half the price. Plus install isn’t that hard. To me, it was well worth the money spent.
Additional Reference Photos
