Custom 3.5" (90mm) CAI in the works
#76
08-23-2009, 10:27 PM
^ no need to post unhelpful criticisms folks. To address the MAF housing restriction, I believe the OP already purchased a MAF bung from Speed Force Racing to weld into the 3.5" pipe when able to retune (Osiris).
If you take a look at the powerlab kit, it has a similar set up - and the OP did mention going to FI eventually. While I think the gains will be minimal for a NA setup, you never know. I don't think it will lose power over stock. I don't think you need a shield in front of the filter. There is no need to worry about water - the filter will keep out large amounts of direct water ingestion, which is all that matters (a little humid air won't hurt).
Good luck.
If you take a look at the powerlab kit, it has a similar set up - and the OP did mention going to FI eventually. While I think the gains will be minimal for a NA setup, you never know. I don't think it will lose power over stock. I don't think you need a shield in front of the filter. There is no need to worry about water - the filter will keep out large amounts of direct water ingestion, which is all that matters (a little humid air won't hurt).
Good luck.
Last edited by rcdash; 08-23-2009 at 10:32 PM.
#77
08-24-2009, 08:46 AM
I am sorry but now this just became even more pointless. You put a giant tube and filter behind the grill (where it blocks the majority of the radiator) for increased flow. But you are covering the huge filter with a huge metal shield??
So you are going to have your filter sandwiched between a hot radiator on one side and hot piece of metal on the other? All of this is going though a 2.25 inch stock throttle body? Am I missing something here?
So you are going to have your filter sandwiched between a hot radiator on one side and hot piece of metal on the other? All of this is going though a 2.25 inch stock throttle body? Am I missing something here?
It's not as if the intake is blocking the ENTIRE grille so air still moves over the intake. There is still plenty of air that's going to go past the intake and hit the radiator at cruising speeds. And the radiator fans pull in plenty of air sitting in traffic. And I have no idea why you think the shield I plan on using will be hot or get hot at all. If anything it's going to stay quite cool in front of the grille. And I've placed my hand behind the grille while the car is sitting after running it and the air in there is cold so the radiator being hot and heat soaking my intake isn't a concern for me especially since the radiator fans pull in cold air and don't push out hot engine bay air to my intake.The stock TB on a VQ35 is 3". The VQ40 TB is 3.25" and but I don't think the VQ40 TB bolts up to the stock VQ30 top plenum.
This is going to be the best intake over any other intake offered by any aftermarket manufacturer. And even though it's 3.5" it will perform just like a 3" but with much better results. I am sure I'll see really good gains like I did when I got rid of the stock intake.
Last edited by Andrei; 08-24-2009 at 09:00 AM.
#78
08-24-2009, 12:25 PM
The radiator being blocked by the intake is the least of my concern. It's not as if the intake is blocking the ENTIRE grille so air still moves over the intake. There is still plenty of air that's going to go past the intake and hit the radiator at cruising speeds. And the radiator fans pull in plenty of air sitting in traffic. And I have no idea why you think the shield I plan on using will be hot or get hot at all. If anything it's going to stay quite cool in front of the grille. And I've placed my hand behind the grille while the car is sitting after running it and the air in there is cold so the radiator being hot and heat soaking my intake isn't a concern for me especially since the radiator fans pull in cold air and don't push out hot engine bay air to my intake.
The stock TB on a VQ35 is 3". The VQ40 TB is 3.25" and but I don't think the VQ40 TB bolts up to the stock VQ30 top plenum.
This is going to be the best intake over any other intake offered by any aftermarket manufacturer. And even though it's 3.5" it will perform just like a 3" but with much better results. I am sure I'll see really good gains like I did when I got rid of the stock intake.
It's not as if the intake is blocking the ENTIRE grille so air still moves over the intake. There is still plenty of air that's going to go past the intake and hit the radiator at cruising speeds. And the radiator fans pull in plenty of air sitting in traffic. And I have no idea why you think the shield I plan on using will be hot or get hot at all. If anything it's going to stay quite cool in front of the grille. And I've placed my hand behind the grille while the car is sitting after running it and the air in there is cold so the radiator being hot and heat soaking my intake isn't a concern for me especially since the radiator fans pull in cold air and don't push out hot engine bay air to my intake.The stock TB on a VQ35 is 3". The VQ40 TB is 3.25" and but I don't think the VQ40 TB bolts up to the stock VQ30 top plenum.
This is going to be the best intake over any other intake offered by any aftermarket manufacturer. And even though it's 3.5" it will perform just like a 3" but with much better results. I am sure I'll see really good gains like I did when I got rid of the stock intake.
#79
08-24-2009, 01:34 PM
heat soak will always be an issue w/the DE. that's why didn't make the HR plenum out of metal. that's why all this work to fab a new CAI isn't really worth it. as long as ur not pulling strait hot air like the Fujita you'll be fine. a higher flowing filters will help ur motor breath easier and get you into higher RPMs quicker but they don't make any "big" hp gains, just the characteristics of more power.
#80
08-24-2009, 03:20 PM
The ID (inside diameter) is 70mm and I have no idea if it is 70mm because I didn't measure ID myself. I have a 3" coupler on it now. That's why I said 3.
I am hoping the DM2 coolant bypass will help me with that problem. And down the road a Cosworth plenum.
heat soak will always be an issue w/the DE. that's why didn't make the HR plenum out of metal. that's why all this work to fab a new CAI isn't really worth it. as long as ur not pulling strait hot air like the Fujita you'll be fine. a higher flowing filters will help ur motor breath easier and get you into higher RPMs quicker but they don't make any "big" hp gains, just the characteristics of more power.
#82
08-30-2009, 09:17 AM
I compared the VQ40 and VQ35 throttle body and they are identical and they both start at about 2.9" and narrow down. The only different is that the VQ40 uses a 3" inlet and outlet MAF housing so the VQ40 MAF sensor could probably be used in a 3" pipe on the VQ35 without tuning but it would not be worth it with FI since the MAF sensor is only used to stop a SES light.
The only option I think is a dual throttle body setup that's been done before by speedforceracing.com
The VQ40 car is a Pathfinder that flipped over.
The only option I think is a dual throttle body setup that's been done before by speedforceracing.com
The VQ40 car is a Pathfinder that flipped over.
Last edited by Andrei; 08-30-2009 at 09:38 AM.
#83
08-30-2009, 12:30 PM
#84
09-02-2009, 03:14 PM
Here is an interesting conversation on some FX50 forums when I asked them about the TB on the FX50. http://www.infinitifx.org/viewtopic....249298#p249298 Unbelievable.
#85
09-22-2009, 02:55 PM
#88
06-06-2010, 03:59 PM
#89
06-06-2010, 11:02 PM
There is a GM TB that works. I will soon have it on the car.
FYI: There is a 90mm GM throttle body that is made by Hitachi (same manufacturer for the Z/G TB). It uses the exact same actuator and sensors, so the opperation is the same, just with more surface area.
The GM part number is 12602800
The pigtail that you will need to adapt the harness is 88988106
We did some testing here with a 90mm intake tube and the above mentioned TB, but the gains we saw were minimal, so we never took the development any further. In the test that we ran it responded really well under load, but it had some pretty bad idle surge. Since we never took it any further, I don't know what it would take to correct the surge, but I'm sure it could be fixed with some tuning.
We also have a couple extra VERY nice CNC adapter plates to fit this TB to a Z/G manifold (all out of the VK ones), and a MAF seat for a 90mm tube. They are $35 and $25 respectfully. Fitting to the stock manifold is not great since you can only bore it out to ~82mm before you cut into the mounting threads for the TB, but that's still better than the factory 70mm.
Just putting that out there in case anyone was interested in picking up on the development where we left off.
Jared@UpRev.com
The GM part number is 12602800
The pigtail that you will need to adapt the harness is 88988106
We did some testing here with a 90mm intake tube and the above mentioned TB, but the gains we saw were minimal, so we never took the development any further. In the test that we ran it responded really well under load, but it had some pretty bad idle surge. Since we never took it any further, I don't know what it would take to correct the surge, but I'm sure it could be fixed with some tuning.
We also have a couple extra VERY nice CNC adapter plates to fit this TB to a Z/G manifold (all out of the VK ones), and a MAF seat for a 90mm tube. They are $35 and $25 respectfully. Fitting to the stock manifold is not great since you can only bore it out to ~82mm before you cut into the mounting threads for the TB, but that's still better than the factory 70mm.
Just putting that out there in case anyone was interested in picking up on the development where we left off.
Jared@UpRev.com
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