07 Hr fit a 03 6mt g35 coupe? - 6MT.net Infiniti G35/G37/GTR Forums
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post #1 of 2 Old 07-19-2018, 05:32 PM Thread Starter
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Default 07 Hr fit a 03 6mt g35 coupe?

Hey guys sorry for the dumb question but im looking into getting a vq35hr, but i wanna know if it will fit the 03 tranny i have on it, is it plug and play? Will it fit the cd009 tranny it comes with? What modifications will i need to do? Thanks
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post #2 of 2 Old 09-17-2019, 06:23 PM
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Items you will need to do a VQ35VHR conversion on any G35 coupe:
The engine, obviously, but it needs to have all of the accessories, the exhaust manifolds and cats or test pipes. You can always buy long-tube headers or HR headers and test pipes.
The JK41B transmission - You cannot use a CD009 or any DE transmission. It will not bolt to the HR. But the JK trans will hook to your existing driveshaft.
A wiring harness built from combining the ECU from a 2007-08 350Z 6MT or G35 Sedan 6MT with the DE wiring harness. Harnesses must all be from manual transmission cars. You also need the piece of cable and connector that connects to the third connector on the HR ECU. The DE
That's mostly it, but the harness is the tricky part. Z-Fever makes a supposedly 100% plug and play harness, but it is $1,750 plus both ECUs. You can buy a 2007-08 350Z ECU from them, but it's like another $800.
Supposedly the HR can use the same engine mounts and the transmission will bolt right up to the driveshaft. This would be a great time to pick up a carbon-fiber driveshaft, although that's another $1,200.
Here's the thing, though: unless you already have the engine and transmission, both ECUs, and the harnesses, this is going to be more expensive than a used twin-turbo kit or supercharger.
Also, if you have to pay labor on the installation, it's going to come close to a new turbo kit or supercharger kit.
The HR probably gets about 35 more WHP than the old DE (not the rev-up). A good turbo/supercharger will get you to 400whp on stock internals with room to go higher if you rebuild your DE with better internals.
Having a rev-up doesn't make much difference on a turbo/supercharger setup because you are still limiting yourself to 400whp.
If you were looking to build a monster NA setup using an HR, you can rebuild an HR and get 9000rpm easily.
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