Last Updated: 09/08/2025 @ 05:52 am
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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)
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