TB Project
TB Project
I have been researching a larger TB for the 4g Max, and it seems as if the 01+ Pathfinder 70mmunit will do the job. The TPS harness plugs fit and the throttle and cruise cables work also. I just had to get a custom adapter plate made and will need to port the intake manifold and the adapter plate by hand to open them up to as close to 70mm as possible. And may need to move the throttle and cruise cable mounting plate up a but because of the adapter plate thickness. I also ported my MAF sesnor a bit. My friend made me a 3" cross over pipe to replace the 2.5" one that cam with the kit. I should have it all on the car by next week end. I'm looking for more boost from volume, we shall see...
Originally posted by BBaker025
what exactley would a wider tb do. Im hoping to turbo my car someday!
what exactley would a wider tb do. Im hoping to turbo my car someday!
Supporting Maxima.org Member
Joined: Jul 2002
Posts: 286
Originally posted by ericdwong
Man you never cease to amaze me
Man you never cease to amaze me
Senior Member
Joined: Aug 2000
Posts: 2,530
Originally posted by raga55
hey! what kinda tint do you have on your car?? (in terms of % and type i mean) i have the same color and am looking for something similar like that for my windows thanks man
hey! what kinda tint do you have on your car?? (in terms of % and type i mean) i have the same color and am looking for something similar like that for my windows thanks man
Matt: how did you enlarge the MAF? How much HP do you think it can handle? I remember reading people using Mustang Cobra MAF's on their sentra's with 400 HP.
Originally posted by ericdwong
how did you enlarge the MAF? How much HP do you think it can handle? I remember reading people using Mustang Cobra MAF's on their sentra's with 400 HP.
how did you enlarge the MAF? How much HP do you think it can handle? I remember reading people using Mustang Cobra MAF's on their sentra's with 400 HP.
Props for the R&D work you did, you should see some decent gains from this IMO. Do you know if the 2002 maxima TB is 70mm like the pathfinder's? And how are you going to port your intake manifold your self? I was thinking about trying to port mine myself, I did a little sanding in there 
Just open up and port match the intake port and spacer to the 70mm TB, not the whole thing like extrude hoan. I will get some aluminum grinding bits for an industrial supply store and go to town. I bet the Max/Alty TB is also 70mm, but drive by wire.
Update
After some trial and error on the adapter plate I finally got it installed. It bolted up pretty good. I had to make a custom throttle cable bracket spacer to move the bracket forward 1" and some custom gaskets but it all works fine just fine! The TPS harness plugs are a squeeze but work. It's ideling a bit rough but the ECU may just need to adapt. I only had time to do just one WOT run, and my but dyno was very happy! I now need to bore out the intake manifold TB port and port match it all nice and smooth. I dont think I will be able to safely get the intake port open to the 70mm size of the TB maybe 67mm if I'm luckey.
Re: Update
Originally posted by MardiGrasMax
After some trial and error on the adapter plate I finally got it installed. It bolted up pretty good. I had to make a custom throttle cable bracket spacer to move the bracket forward 1" and some custom gaskets but it all works fine just fine! The TPS harness plugs are a squeeze but work. It's ideling a bit rough but the ECU may just need to adapt. I only had time to do just one WOT run, and my but dyno was very happy! I now need to bore out the intake manifold TB port and port match it all nice and smooth. I dont think I will be able to safely get the intake port open to the 70mm size of the TB maybe 67mm if I'm luckey.
After some trial and error on the adapter plate I finally got it installed. It bolted up pretty good. I had to make a custom throttle cable bracket spacer to move the bracket forward 1" and some custom gaskets but it all works fine just fine! The TPS harness plugs are a squeeze but work. It's ideling a bit rough but the ECU may just need to adapt. I only had time to do just one WOT run, and my but dyno was very happy! I now need to bore out the intake manifold TB port and port match it all nice and smooth. I dont think I will be able to safely get the intake port open to the 70mm size of the TB maybe 67mm if I'm luckey.
hrmm.. do you have pix of this stuff?
hrmm... thanx for taking the bold step.. i remeber for hondas enlarging the tb gave 7hp to the wheel NA. i thot that was the best bang for the buck mod.. if all goes well with your tb mod then i mite do the same too.. i would definately be buggin' u about all that when that times comes tho..
After some trial and error on the adapter plate I finally got it installed. It bolted up pretty good. I had to make a custom throttle cable bracket spacer to move the bracket forward 1" and some custom gaskets but it all works fine just fine! The TPS harness plugs are a squeeze but work. It's ideling a bit rough but the ECU may just need to adapt. I only had time to do just one WOT run, and my but dyno was very happy! I now need to bore out the intake manifold TB port and port match it all nice and smooth. I dont think I will be able to safely get the intake port open to the 70mm size of the TB maybe 67mm if I'm luckey.
MardiGrasMax Just open up and port match the intake port and spacer to the 70mm TB, not the whole thing like extrude hoan. I will get some aluminum grinding bits for an industrial supply store and go to town. I bet the Max/Alty TB is also 70mm, but drive by wire.
MardiGrasMax Just open up and port match the intake port and spacer to the 70mm TB, not the whole thing like extrude hoan. I will get some aluminum grinding bits for an industrial supply store and go to town. I bet the Max/Alty TB is also 70mm, but drive by wire.
Originally posted by MardiGrasMax
I dunno, but I bet you can do somting to make the maf and tb bigger on a VQ30 5th gen
I dunno, but I bet you can do somting to make the maf and tb bigger on a VQ30 5th gen
Hey Matt I got a quick question. I noticed that a stock MAF has a plastic post on the top and the bottom of the actual sensor. It looks like you removed one of those. I guess the wire to the sensor runs through only one of them. Which one did you remove? I would assume that it is the one on the bottom of the MAF, since the electronics and connector sit on the top of the MAF. Also, do you think a simple polish job on the stock TB would do anything, or would it be a waste of time? ANy help would be appreciated.
Matt
Matt
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I know I'm not Matt, but years ago I hand-polished the inside of my (stock) throttle body. The results was improved throttle response, especially when just barely pushing the accelerator. Max power was unchanged. The downside is that the car is touchier when I'm trying to granny the car in traffic. It's hard to drive the car smoothly in heavy traffic. Overall, I don't regret having done it but wouldn't do it again if I had the choice. I'd recommend you just leave it alone.
Originally posted by 96sleeper
Hey Matt I got a quick question. I noticed that a stock MAF has a plastic post on the top and the bottom of the actual sensor. It looks like you removed one of those. I guess the wire to the sensor runs through only one of them. Which one did you remove? I would assume that it is the one on the bottom of the MAF, since the electronics and connector sit on the top of the MAF. Also, do you think a simple polish job on the stock TB would do anything, or would it be a waste of time? ANy help would be appreciated.
Matt
Hey Matt I got a quick question. I noticed that a stock MAF has a plastic post on the top and the bottom of the actual sensor. It looks like you removed one of those. I guess the wire to the sensor runs through only one of them. Which one did you remove? I would assume that it is the one on the bottom of the MAF, since the electronics and connector sit on the top of the MAF. Also, do you think a simple polish job on the stock TB would do anything, or would it be a waste of time? ANy help would be appreciated.
Matt
Originally posted by 96sleeper
I guess the wire to the sensor runs through only one of them. Which one did you remove? I would assume that it is the one on the bottom of the MAF, since the electronics and connector sit on the top of the MAF. Also, do you think a simple polish job on the stock TB would do anything, or would it be a waste of time? ANy help would be appreciated.
Matt
I guess the wire to the sensor runs through only one of them. Which one did you remove? I would assume that it is the one on the bottom of the MAF, since the electronics and connector sit on the top of the MAF. Also, do you think a simple polish job on the stock TB would do anything, or would it be a waste of time? ANy help would be appreciated.
Matt
Kev is right about the polish job.
Originally posted by Ramius83
Where and how much did you get that TB for? I am really looking into this. Thanks Matt.....
Where and how much did you get that TB for? I am really looking into this. Thanks Matt.....
Thanks for the help. I have one more question though. Did you find any other throttle bodies that might fit the max? I saw where you asked about the Q45 one on their board, but its too big. The SR20DE has a 60mm throttle body stock, so I was thinking maybe its the same one, and a company makes a 65mm throttle body for that engine I believe. I know there will be very little gains from doing a TB on a N/A car, but I am looking for some little things to do to pick up a few more hp. I think I will port the MAF and maybe port the VI when it gets here before I put it on the car. I might get boost or nitrous one day, so it will help then anyway. Sorry for all these random thoughts, but I know you just researched it for your car, so you might know...Plus you are the man when it comes to mods.
I have one more question though. Did you find any other throttle bodies that might fit the max? I saw where you asked about the Q45 one on their board, but its too big. The SR20DE has a 60mm throttle body stock, so I was thinking maybe its the same one, and a company makes a 65mm throttle body for that engine I believe. I know there will be very little gains from doing a TB on a N/A car, but I am looking for some little things to do to pick up a few more hp. I think I will port the MAF and maybe port the VI when it gets here before I put it on the car. I might get boost or nitrous one day, so it will help then anyway. Sorry for all these random thoughts, but I know you just researched it for your car, so you might know...Plus you are the man when it comes to mods.
Originally posted by MardiGrasMax
Q TB's are 77mm, which is way too big. Check into that sentra one it might work.
Q TB's are 77mm, which is way too big. Check into that sentra one it might work.
Originally posted by Ramius83
Sorry to bring this back from the grave.
Matt, can you get those pics back up. I have one coming in....
Sorry to bring this back from the grave.
Matt, can you get those pics back up. I have one coming in....
I now have the TB and i noticed that in your pics mardigrasmax that you took the plunger of the top and the whole piece of the bottom off the pathfinder TB ,are those not neccasary? and did you plug the slits and holes with something, thanks . chris L.
Originally posted by krismax
I now have the TB and i noticed that in your pics mardigrasmax that you took the plunger of the top and the whole piece of the bottom off the pathfinder TB ,are those not neccasary? and did you plug the slits and holes with something, thanks . chris L.
I now have the TB and i noticed that in your pics mardigrasmax that you took the plunger of the top and the whole piece of the bottom off the pathfinder TB ,are those not neccasary? and did you plug the slits and holes with something, thanks . chris L.
Do you have pics of what you are talking about?
Originally posted by MardiGrasMax
I just put a plate on the bottom of the TB used 3 screws and the factory gasket, Inside the tb the slits are still their.
Do you have pics of what you are talking about?
I just put a plate on the bottom of the TB used 3 screws and the factory gasket, Inside the tb the slits are still their.
Do you have pics of what you are talking about?
