Engine Modifications

Does anyone know of some performance upgrades for the Supercharged Xterra? I was thinking along the lines of headers and possibly a twin turbo kit. Also, computer upgrades and maybe a different gear pulley for the supercharger?

Just curious.


Thanks,


minigts

Try search, it is easy to use!

What the hell? A twin turbo kit in addition to the supercharger? You're out of your mind! Stick to the slow lane pal, your brain can't keep up.

I used to drive a 10 ton wrecker with a turbo-supercharged diesel. Of course, it did have pistons as big around as Arnold Schwarzneggers legs and you could have 4 people do the Hokey Pokey on the valve cover... :biggrin: And that 40,000 lb winch was no slouch either...

Sorry, but can't just stick with the plain old thing. Besides, 210HP out of a SC v-6 is somewhat weak. My friend has a 2002 Maxima that has 255HP, normally aspirated. And the truck has all kinds of potential with the motor in it. I was just curious if anyone had done any engine mods or had heard of some worth doing.

If you are really serious about getting more power, there was a thread about boring out the cylinders, putting in a new cam, Infinity pistons and some more mods that I can't think of off the top of my head. It was supposed to get you over 250 HP, but he also warned that the tranny probably wouldn't take more than 250HP very well.

Another option is a 3.5L engine swap, which is the one in the Maxima, Pathfinder, and in some form, the 350Z.

Richard

Thanks for the information. I found a site the other day where a guy has a twin turbo kit on his Xterra, but the link has been down the last couple of days.

But thanks for the information on that.

Jon

Originally posted by minigts
Thanks for the information. I found a site the other day where a guy has a twin turbo kit on his Xterra, but the link has been down the last couple of days.

But thanks for the information on that.

Jon

Yeah, I remember that. Some impressive work he did.

Just so you know, if you try to chain in turbos with a super-charger on a gas motor odds are you will hand-grenade the motor. The bottom end in the X motor isn't overly tough and I don't know that I would boost it too extensively trying to make more power. There are a few folks who have been reworking the SC and odds are if you keep looking you will find someone who has done it with info for you.

the only problem with doing some of these swaps is that there is not enough torque

who cares if it has horsepower what all the wheelers want is Torque

who cares if it has horsepower what all the wheelers want is Torque

well said!!

With all of the money that ur looking to dump to get the results you want, ya may as well buy another vehicle and slap a nissan and an xterra decal on it.
SHEESH!

Twin turbo + supercharger can be done.....but there's so many other things you should do before going that stupidly extreme.

Get a smaller pully for the supercharger snout. That'll up boost, and consequently horsepower by a LOT. Not sure on sizes being that I know nothing about the 3.3l....(just purchased it yesterday)....but I have dealt with boosted cars a lot.

I know on a Grand Prix GTP, if you run a 3.2" pully instead of the stock 3.8", you'll be seeing an increase of about 80whp.

Suggestions: Get a smaller pully, cai, headers, high flow cats, exhaust, and get a dyno tune (smaller pully's usually mean advanced timing maps and fuel tables).

Then when you're done with all of that, you can think about your monster twin turbo, lol.

After some research, I found that the supercharger on the Xterra S/C is an Eaton M-62. Weak superchager, guys usually put them on their 2.4l cavi's and ford focus's.

Look at www.whipplesuperchager.com , more specifically model 1600ax. It's similarly sized to the m62, may even bolt up to the manifold just fine. BUT it's a twin screw.....meaning it'll put out almost double the boost, with minimal strain on the acc belt, and yields a very low temperature charge in the intake manifold because it creates more boost at lower rpms'.

Another nice thing about the whipple..... it creates full boost at ~1800rpm. Very good for low end torque and mid range horsepower. You'd see amazing gains with that setup.

Model # 1600ax: it'll work very well with the given displacement, and would prove to pound out some major power.

http://www.automotive.eaton.com/product/engine_controls/M62.html
The Eaton Supercharger Model 62 is designed for 2.5L to 4.0L passenger car and light truck engines, but may also be suitable for other engine sizes, depending on total system performance requirements.

Take it from someone who had one on his 3.4l V6 Grand Am GT, then switched to a Whipple 1600ax...... the eaton blowers suck.

Don't spin up as fast, yield very hot air charges, suck on top end, are usually overrated as for engine placement.

and yields a very low temperature charge in the intake manifold because it creates more boost at lower rpms'..


The fact that it may create more boost at lower RPMs doesn't mean that it will "yield a very low temperature charge in the intake manifold". The temperature charge is dependant on the pressure rise across the compressor (boost) regardless of the RPM at which it's running. So two compressors producing the same amount of boost at different RPMs will be producing nearly identical "temperature charge".

The fact that it may create more boost at lower RPMs doesn't mean that it will "yield a very low temperature charge in the intake manifold". The temperature charge is dependant on the pressure rise across the compressor (boost) regardless of the RPM at which it's running. So two compressors producing the same amount of boost at different RPMs will be producing nearly identical "temperature charge".
Being that there's less friction, since it can create boost at lower rpm's........there's less temperature change.

Temp is not completely dependant on boost levels. If that were the case, centrifugal's would create the same high temps as a roots style supercharger.

Intake temps dropped 40 degrees on average, at the same boost levels, between my roots and twin screw superchargers.

That was going from the Eaton m62 to the Whipple Twin Screw 1600ax. 40 degrees is a lot.....

So you're saying that you got a 40 deg temperature drop because one supercharger had less friction than the other?

So your compressor was dumping heat into the air flow at a rate high enough to raise the temperature by 40 degs higher than the other compressor? And you're attributing the temperature rise to internal FRICTION???? :screwy:

I'm not saying that you didn't actually measure this temperature delta, I just think it's highly more likely that something else was causing it, such as differing air mass flow rates, a misplaced thermo-couple or different pressure deltas across the compressor. In order for the air flow to have been 40 degrees hotter in one product vs. the other (at steady state, with everything else the same) the surface temp of the actual compressor must have been MUCH higher than 40 degrees hotter than the cooler compressor, which as you correctly stated, would be pretty stinkin' hot.