supercharging a nissan v8

[cool__bananas]

hi all, does who knows something about nissan v8s??? im looking at a 4.5 nissan v8 with a supercharger on top, does the m90 off a lexus fit, what can fit it? i want as much hp as i can get without changing internals unless i need to, but hopefully i can get 700hp with heaps off boost and not too much mods, so if anyone knows anything i would be keen to learn, thanks

[skid]

hi all, does who knows something about nissan v8s??? im looking at a 4.5 nissan v8 with a supercharger on top, does the m90 off a lexus fit, what can fit it? i want as much hp as i can get without changing internals unless i need to, but hopefully i can get 700hp with heaps off boost and not too much mods, so if anyone knows anything i would be keen to learn, thanks

don't let that 2nd place go to your head young fella.

are you looking at importing some military axles from the states to handle all that HP you're expecting to get

its not all about how much boogie you have, you just came second with nowhere near that much HP

[cool__bananas]

it wasnt just cuse of 2nd, we have been talking about it for a while cuse dad wants mine as a club truck (but dodgee doesnt think we should supercharge it) but dont worry about diff breaking, were gonna use nissan running gear, so the gearbox is starting to look weak (fwd box)

[doddzee]

Never said dont supercharge it mitch, just if you do make sure its all strong enough. You will not get 700hp out of it by uping the boost alot more is needed. Get that number out of your head

Talk to your boss about what will fit, it will require custom work which he will be doing for ya anyway.

[cool__bananas]

500psi of boost mite get that number while its cranking and then when it idols it will blow up!

[darinz]

You can get 700hp out of a standard motor but it won't last long. That will require about 12to 14psi and at that it will detonate. The limits for a standard motor are about 600hpie 10psi. Beyond that you'll need to run forged pistons and decompress it. The injectors will handle about 550 hp. If you want to run more boost then decompress it and then the bottom end with the exception of pistons will handle 1000hp. With 10psi and a very good tune you will get close to 600hp. I currently have about 530hp with 10psi and that is a standard motor with standard injectors but the injectors are at 87% but that is restricted to 6000rpm (capable of 7500) and the cams are not being switched. I need to fit bigger injectors and a bigger wastegate to enable more revs. But to be honest that won't be happening anytime soon as it already has a huge amount of power.
You will want to run with an auto otherwise you will break things. If you were up here I'd be happy to take you for a drive to show you what can be achieved.
The biggst thing to remember with this motor is it isn't a Lexus so don't rely on anything that works on a Lexus. The VH45 heads flow a huge amount more and the bottom end is far far stronger. This motor was designed by Nissan and Cosworth. A supercharged Lexus is not going to have anywhere near the 600hp you are talking about without some serious work and even then it won't last as long.
If you're serious about using a VH45 then go to the NICO VH&VK forum as most of your questions have already been answered.
I can't coment on supercharging as I have turboed mine but it does have 2psi at 2000rpm and 10psi at 3000rpm. It is very very controlable power and has power from down low.

[cool__bananas]

thanks for the info, i think 10psi will be plenty of grunt its going to be going in a new dclass trials truck with gq front nissan diffs (is going to have rear steering like my old one) and i toyota windom fwd gearbox (which is starting to look really weak!)

[darinz]

I'm running a Patrol auto that has had a fair bit of work done to it including an imported valve body. In it current state it will handle 650hp reliably and for drag racing about 1000hp. I think the likely hood of a 3.0 FWD gearbox handling the power from a motor that started life with 410nm and then is going to be about doubled by blowing it, could be a wee bit hopeful!!!!!!!!!!!!!!!!!! Don't forget the VH has 80% of it's torque at 2000rpm and holds at least that untill 6900rpm and that is without assistance! I fitted the turbo to get more torque and to get it lower down the rev range. Out of the factory peak torque is 4000rpm but I now have full boost at 3000rpm so we are assuming peak torque is somewhere in between. We didn't check that on the dyno so don't know for sure but it sure hauls arse from about 2500rpm and with stall speed about that there is no wait for power as long as the gear is right.

Can't wait to see what you do!

[cool__bananas]

i cant wait to see it aswell!!! il keep you posted, when the project starts il take photos and start a post on it (but it probably wont be until the end of the year

[tweake]

plenty of kits in USA afaik. proberly similar to titan v8's.

http://www.clubfrontier.org/forums/index.php have a bit on it (tho mainly v6's). http://www.titantalk.com/ would problerly have some better info.

[darinz]

The Titan uses a VK56 which is later model motor that while it in theory is similar it doesn't have the same goods and not much is interchangable. The VH has a stronger bottom end and better heads than the VK, typical in that the later model is nowhere near as over engineered but is more fuel efficent and so has less HP potential. Still a good motor but compared to about $1500 tops for a VH not a cost effective option. They also don't rev as high!

[cool__bananas]

do you know how much your motor weighs? cheers

[darinz]

With alternator and PS it is about 220kgs. Heavier than an LS1 due to the quad cams also it is physically a bigger motor than an LS1 ie it is about the same external measurements as a big block chev, so it can be difficult to fit in. At the cam pulleys a VH45 is about 840mm wide and a VH41 is about 800mm due to smaller cam pulleys. Everything else is the same between the 2 motors and in fact you can swap internals to get a VH41 that is 4.5l. The advantages being that the 41 has a duplex cam chain, smaller cam pulleys and the alternator is in the valley from the factory. On the 45 the alternator is on the drivers side down quite low and in factory position it won't fit in a Patrol chassis.

If you are serious about SC and are going to make an inlet manifold then you want 2 sets of the lower inlet runners as you can then very easily make custum inlet that will make SC easier.

[cool__bananas]

i think that just put me off the vh45 i guess it will be an ls3 or a stroked ls1 thanks anyway, il keep you posted

[darinz]

The weght difference is not much. In reality they are about the same but an LS1 is a smaller motor so is space is an issue then it will be better. But if you plan on going for more than 600hp then the VH is the option as it is a cheaper to get this sort of hp out of. ie all you need is pistons and some forced induction, why as the Chev needs crank etc as the crank is limited to about 650hp. They're both good motors you just need to be clear about what you want to achieve.