Why does the VX sound

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Originally Posted by Luna X

like an F15 fighter jet on the runway?

I have an aftermarket air filter on it, and I recently replaced the fan clutch. But this thing is loud! My 350Z (same size engine btw) creates a beautiful growl but doesn't have anywhere near the loud, whirring noise that comes from the engine of the VX...

any idears?... :_shrug:

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Though not coming from the engine compartment, I wonder if you have a PV2 muffler on. Power Vault made mufflers specifically for our VX and the second generation PV was VERY loud. Too loud for many.

Mine got louder after taking the restrictive elbow off.

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Originally Posted by Bob Barker

I had no idea they weighed that much.

I remember reading though that the factory transmissions can only hold around 300hp before they grenade. Maybe that's some of the reason why they didn't put a stronger motor in there.:_confused

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If it makes you feel better, the 4l30e tranny we have is the same that is used in the Chevy Aveo. High quality...

Does the JDM version of the VX use the same trans.?

I don't know about the JDM version, but we don't have the same 4L30-E tranny as all those other makes and models. We don't even have the same 4L30-E that's used in most other Isuzu's. The 4L30-E has been around a long time and it gets changes almost every year. Our version of this tranny is only used in a '98+ 3.5L Trooper, that's it. It gets different components based on what specific vehicle it's gonna be used in. So they're not all the same.

This is what Isuzu says about our tranny-
"Though similar to the 4L30-E transmission used in other Isuzu models, the 4L30-E in the Vehicross has been modified to deal with the added horsepower and torque."

My tranny is rock solid at 234,000 miles and I wouldn't be surprised if I get 400,000 miles out of it.

Mark Griffin

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Originally Posted by Luna X

like an F15 fighter jet on the runway?
\

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Is the not a good thing :)

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Originally Posted by Gussie2000

Isuzu just don't wanna spend more cash to design & develope an stronger and better engine for the VX,

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That's not entirely true...Isuzu was working on a V8 for the Trooper, but when it became clear the US market was a no-go, they dropped the program.

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Originally Posted by Luna X

like an F15 fighter jet on the runway?

I have an aftermarket air filter on it, and I recently replaced the fan clutch. But this thing is loud! My 350Z (same size engine btw) creates a beautiful growl but doesn't have anywhere near the loud, whirring noise that comes from the engine of the VX...

... that leads me to another question.

How does Nissan get 75 more horses from their 3.5 than what Isuzu produces? Is it mostly in the computer? Would remapping work? (If it can even be done)
I'd love to get a little more power, but since the supercharger is no longer available, and turbo kits are more of a piece together, it seems like choices are quite limited.

any idears?... :_shrug:

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Also the 350Z has about 10.3:1 compression and the Isuzu 3.5 is a bit over 9:1, just increasing the compression ratio and nothing else, you're only looking at maybe a 10-15hp increase at the engine at most. Also there is no tuning software for our trucks that we can just plug in and mess around with which sucks and I wouldn't trust a JET computer on anything I own. You can wire up a megasquirt to control the fuel/timing on our engines though which will help, HP Heaven can custom grind cams for the Isuzu V6's but they are in australia and the price will be a little expensive. Also, engine design plays a big part, just because one engine puts out the same displacement as another, doesn't mean they should be equal. Valve timing, ignition/fuel curves, stroke/bore, etc. The Nissan engine uses a shorter stroke and larger bore. We really have no "bolt-on" ways of making alot more HP out of these things so it's all going to be a custom [project until someone decides to start producing stuff. You can send your piston/rod off to someone who will make forged/billet versions of them, slap them in there, slap a turbocharger on it, megasquirt computer and tune it with 10-15psi of boost and you'll have a pretty peppy engine lol

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Originally Posted by RamAirZ

Also the 350Z has about 10.3:1 compression and the Isuzu 3.5 is a bit over 9:1, just increasing the compression ratio and nothing else, you're only looking at maybe a 10-15hp increase at the engine at most. Also there is no tuning software for our trucks that we can just plug in and mess around with which sucks and I wouldn't trust a JET computer on anything I own. You can wire up a megasquirt to control the fuel/timing on our engines though which will help, HP Heaven can custom grind cams for the Isuzu V6's but they are in australia and the price will be a little expensive. Also, engine design plays a big part, just because one engine puts out the same displacement as another, doesn't mean they should be equal. Valve timing, ignition/fuel curves, stroke/bore, etc. The Nissan engine uses a shorter stroke and larger bore. We really have no "bolt-on" ways of making alot more HP out of these things so it's all going to be a custom [project until someone decides to start producing stuff. You can send your piston/rod off to someone who will make forged/billet versions of them, slap them in there, slap a turbocharger on it, megasquirt computer and tune it with 10-15psi of boost and you'll have a pretty peppy engine lol

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The answer to all of lifes problems can be found here...:yesgray:

You're results may vary.

http://www.facebook.com/pages/Nitrou...e/270465350733

that's like, all crazy, and stuff.... :yesgray:

Tis true Dub, and I have used it many times. Probably going to run it on the 68' too. Just wouldn't run it on the VX for anything over a 50hp shot without better internals and a way to retard the timing + colder plugs. Nitrous is the cure for all things slow lol

You got to think of the VX engine as an agricultural setup. It just aint a performance engine, also sounds pretty crap for a V6!!!! But hey, it still grumbles!

thanks for backing me up, c-r... ;)

Tone ran Nos on his VX before the supercgarger....unfortunately all those threads are on the old board which no longer exists.

I am hopeing that by the time my VX engine gives up the ghost that there will be a few of those 2011 mustang v6's floating around the parts yards. Similar small package, 30mph (probably a bit less in the heavy VX) and 305hp stock. Would make a nice swap me thinks!:bwgy:

Backing you up for what lol, don't think most of us actually consider the 3.5 to be a performance engine, but it gets the job done for what it was intended for, and you can always make it faster, just takes time, money and effort, like with anything else in this world. Also my VX doesn't make the sounds yours seems to, I actually like the sound of mine until the AC compressor bearing started going out. Oh and CR has the 3.2 so it'd be all the 6VD1 and 6VE1's that must sound like crap to some.