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Intake-Manifold

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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

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Cutting the stock manifold

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Cutting the stock manifold (again)

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Final Product (I have a lot of work to do )

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From NiZMo1o1

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Small Update Started polishing the ports on the stock manifold and removing some excess material…

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Also, here’s a pic of the parts (minus the sheet metal which was in the other room)

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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

Community Member Credit: vbxmaxima

Well, if you’re here, you are probably experiencing some trouble because the TPS is not a regular maintenance item! Unfortunately, TPS failure seems rather common. It’s happened to me, and I see it in one to two other Maxima enthusiasts a year. Heck when Edmunds.com was evaluating the new 2K Max, they had problems with the TPS. And the car was brand-spanking new!

WHAT IS THE TPS?
The throttle position sensor is a potentiometer – a variable resistor. The ECU sends the TPS a 5V signal. Depending on the position of the throttle, the TPS will send back to the ECU a voltage proportional to how open the throttle is.

Here is a pic of the TPS.

This is the back. Notice the metal bracket that connects to the throttle body. This bracket is rotated by the throttle to change the TPS’s internal resistance.

Symptoms: The most obvious is if the TPS just up and dies. You’ll get a check engine light and the 0403 trouble code. (Trouble codes will be covered at a later date). However, if the TPS is still gasping its last few breaths, you won’t necessarily get the light. But you will get inexplicable, “spontaneous” drops in RPMs. It’s most pronounced when you are at idle or the engine is coasting to idle after disengaging the clutch. I have yet to see someone tell of problems when the car was moving/accelerating.

TROUBLESHOOTING:

Here is the TPS in the engine bay (red arrow).

You want to pull out the connector away from you (yellow arrow). Do this when the engine is OFF.

You will then expose the pins on the connector.

1. Connect the positive lead of your multimeter (voltage checker) to pin 1.

2. Then connect the negative lead to a ground in the engine bay.

3. Turn your key to the ON position (Do NOT start the car)

4. You should see about 5 volts on the multimeter, indicating the ECU is sending the proper signal.

5. Reconnect the harness to the TPS and start the car.

6. Warm up the car. (This is because heat affects resistance)

7. When warm, turn the engine off, and put the ignition switch to OFF.

8. Connect your meter to pins 2 & 3.

9. With the throttle completely closed (foot off the gas pedal), you should read about 500 ohms of resistance.

10. Start pushing on the gas pedal – resistance should rise. When the gas is fully depressed (wide open throttle), the resistance should be about 4000 ohms.

11. If you are slightly off, you can still adjust the TPS to compensate.

12. Notice that the holes that the screws go into on the TPS are slotted, giving you some clearance. Loosen the screws so that you can turn the TPS in place. If you can twist the TPS so that the values are correct for the different throttle positions, retighten the screws – you’re done.

13. Otherwise, you are out of luck. Time to pick up a new TPS.

A new TPS will cost about $60-$70. Just unscrew the two screws holding the old TPS and put the new one in and adjust until the resistances are right. Then, tighten down the screws. (Yes, the 2nd screw on the other side not shown in the pic is a pain to unscrew) (And yes, these are not the OEM screws. I galled the OEM screws unscrewing them out. These screws are bought from “Home Depot Motorsports” hehe.

Community Member Credit: Stephen Max

Here are the steps involved in converting to a 70mm Pathfinder throttle body:

1. Make or purchase adapter plate,

2. When you first do a trial fitting of the adapter plate to the intake manifold, you will see that the 70mm opening is considerably larger than the bore of the intake manifold. I got my high speed drill (cordless drills are too slow) and a bag of coarse grit 2” sanding drums and started opening up the intake to match. First scribe or mark the 70mm diameter of the adapter plate bore onto the mating surface of the intake. Then start removing material. I did it with the intake manifold removed from the engine. If you do it on the engine, stuff several rags down the throat to keep aluminum dust out of the engine and then use a shop vac to suck all the dust up. It’s a good idea to have the shop vac running with the nozzle fixed in place at the grinding area so that the dust immediately gets sucked away. Note that the outer surface of the intake necks down several millimeters just beyond the mating surface. For that reason I was not comfortable increasing the bore all the way out to 70mm in that region, rather I tapered down to a 68mm bore to keep from breaking through the wall of the intake. I removed material for about 3-4 inches into the intake, and followed up with a nice polishing job with a Dremel. I wish I had a picture to show you, it was very pretty.

3. If you bought a TB that had the Pathfinder IAC and coolant passageway attached, you will have to remove them because there is not enough space beneath the TB for the IAC stuff.

4. You will have to make a plate that bolts to the bottom of the TB to seal it off, otherwise you will have a massive vacuum leak. See the attached jpg below. You can reuse the fancy o-ring gasket if your TB came with it, otherwise you will have to buy a new one from the dealer. I drilled a hole in the bottom of the plate and attached a hose nipple for the EGR control valve solenoid vacuum hose.

5. Some people have left the TPS as is, with the connectors pointing away from the intake manifold. This really stretches the TPS harness and in my case there was not enough slack in the harness to reach, so I took the TPS off and rotated it 180 degrees so that the connectors point backward to the intake manifold. The harness connectors can now easily reach the TPS.

6. After you remove the Maxima TB you will have to connect together the two coolant lines that connect to the TB, since you removed the coolant passageway and IAC from the Pathfinder TB. But you’ve always wanted to do the useless TB coolant bypass, now, haven’t you? Admit it.

7. At this time you can bolt the adapter plate to the intake manifold (if you haven’t already) and then bolt the TB to the adapter plate with a new gasket. The Pathfinder TB gasket is a fancy metal one, similar to our IAC gasket. You may have to connect the TPS to its harness as you are mounting the TB.

8. Attach the throttle and cruise control cables. My .75” thick adapter plate allowed me to attach the throttle cable without having to reposition the throttle cable adjustment bracket, but the cruise control cable was just a hair too short. I don’t care since my cruise control hasn’t worked since I did the tranny conversion anyway, but if you want cruise control you will have to do some repositioning of the bracket. I’ll do it eventually since I don’t like the looks of a loose cable.

9. Attach the intake pipe to the TB and you’re done. On my setup, the TB sticks out about .25” further than the Maxima TB did. The Pathfinder TB is shorter axially than the Maxima TB, which helped make up for the .75” thick adapter plate. The extra .25” or so was not enough to cause any problem with the intake pipe.

Community Member Credit: ATTappman

Recently I had to remove my UIM to tighten the hose clamps on the coolant hoses connected to the backside of the UIM. Here’s a description of the job with some photos. The car is a 1997 GLE Fed spec.

Part 1:

First, you have to remove the air intake. Start by popping off the four clips that secure the top of the air filter box:

Disconnect the MAF sensor electrical connector:

Disconnect the two large vacuum hoses and one small hose from the resonator:

Note that I unhooked the IACV end of the second large hose, to keep the hose attached to the resonator.

Part 2:

Loosen the hose clamp on the throttle body, wiggle the air duct off of the throttle body, and lift the whole air intake assembly out of the engine bay:

Disconnect the two electrical connectors from the throttle position sensor:

Disconnect the four electrical connectors from the IACV/fast idle solenoids/EGR temp sensor:

Part 3:

Unhook the cruise control and accelerator cables from the throttle lever. Note that the accelerator cable runs underneath the little tab on top of the throttle lever:

Remove the three 10mm bolts that secure the cable brackets to the UIM. Move the whole assembly to the back of the engine bay:

Disconnect the electrical connector on the EVAP purge volume control valve:

Part 4:

Disconnect the electrical connectors to the ignition coils and the front O2 sensor:

Unhook the wiring harness. It’s secured by plastic clips. With a pair of needle-nose pliers, compress the two “wings” on the bottom of the clip while simultaneously lifting up from the top. Move the wiring harness to the passenger side of the engine bay:

Remove the two 10mm and two 12mm bolts/nuts securing the EVAP purge control valve and the EVAP purge volume control valve to the UIM:

Part 5:

Remove the 10mm bolt holding the EGR temperature sensor bracket onto the IACV. This bolt is hard to see – you can locate it by feel. You’ll need a 3″ extension or a deep socket. The EGR temp sensor wire is in the way – make sure to move it aside to keep from pinching it with the socket. (No pics for this – it’s too hard to see).

Remove the three 12mm bolts holding the IACV to the throttle body. You need an extension for the bottom bolt (my camera battery went dead here and I switched to my cell phone camera – the pics are blurry, sorry):

Lift off the IACV, being careful not to lose the gasket in the engine bay:

Move the EVAP valves back toward the driver’s side of the engine bay. Most of the hoses will still be attached:

Part 6:

Remove the clamps on both ends of the PCV hose assembly, remove the 10mm bolts holding it to the UIM, and remove it:

Unscrew the two screws holding each ignition coil, and pull out the ignition coils. (No pics).

Unhook the vacuum hose from the UIM to the brake booster:

Now comes the hard part. The UIM is bolted onto the rear cylinder head with two support brackets. The EGR guide tube is also bolted to the UIM with two bolts. All of these are 12mm. The best way to locate the support bracket bolts is to feel with your hand along the firewall side of the UIM. Here’s what it looks like with a socket and ratchet on one of the bracket bolts:

You can see one of the EGR tube bolts, but you have to locate the other one by feel. It’s difficult to get a socket on the right UIM bracket bolt. You need a pretty shallow socket and a low-profile flex head ratchet (this is one job where Snap-on tools pay off). If you can’t use a ratchet, try a 12mm offset wrench. Once you loosen the bolts, use a socket to spin them off. Be careful not to drop them.

Taking off the left EGR tube bolt:

Part 7:

At this point, I was soaked with sweat and had a backache, so I stopped taking pictures.

The only remaining bolts are the four 12mm bolts on the front of the UIM. There’s a pattern for tightening these bolts, so I loosened them in the opposite order. If you’re looking down at the UIM from the front of the engine bay, the tightening order is 4-1-2-3 from left to right, so take them off in the reverse order.

Now the only thing holding the UIM on is two coolant hoses in the very back. If the UIM won’t separate from the lower intake manifold, take a thin putty knife and gently pry between the UIM and the gasket, being careful not to gouge the UIM.

Next, get an assistant (I used my wife – she’s a good scout) to hold the UIM as far up in the air as they can. This will reveal the two coolant hoses on the back of the UIM. It’s an extreme PITA to loosen the hose clamps and pull off these hoses. When you pull on them, you just pull the UIM and your assistant toward you. It took me a lot of patience and a lot of swearing to get them off. Getting them back on is no fun either. Maybe somebody can share a trick for this.

With the coolant hoses off, you can lift the UIM out of the engine bay. Here’s what it looks like with the UIM removed:

You can see the two support brackets and the top of the EGR guide tube. Here’s what my EGR guide tube looked like the first time I took the UIM off:

Reinstallation, as they say, is simply the reverse of removal.

Be careful not to knock the EGR tube gasket off into the engine bay. If you put in a new EGR tube gasket before reinstalling the UIM, it helps to tie two loops of fine dental floss through the EGR tube bolt holes and the gasket. This will secure the gasket to the EGR tube and keep it from falling off when you’re putting the UIM back on.

When reinstalling the UIM bracket bolts, get your assistant to move the UIM up and down slightly so that you can align the bolt holes on the UIM with the bolt holes on the cylinder head.

As you may have noticed, I rethreaded most of the bolts into their holes to keep from losing them. The ones you can’t do this with are the IACV/EGR temp sensor bracket bolts, the UIM support bracket bolts, EGR tube bolts, and UIM bolts themselves. I made post-its for each set and put the bolts on the post-its.

I used Permatex gasket adhesive to hold the UIM gasket and the IACV gasket in place during reinstallation. It was mildly successful.

That’s about it. Hope this helps somebody.