Hyuk hyuk... Dat dere big motor will be awesome fast in mah truck. Lets talk about facts. See what happens when you run more than 5lbs of boost in a 10.5:1 compression motor, and if your tune is out even a tiny bit... Kaboom. Oh and lets not forget the plastic timing chain guides in the 90-93 motors, not fun when that breaks. Way more to it than, big motor make caveman go fast...
There is alot more to it than that, but the basics of it are 2 engines with very similar layout, one 3.0v6 the other 4.5v8, both tuned correctly and running reliably, pound for pound the v8 will kill the 6. No question about it, will the VH run reliably at 15psi like a VG? no it wont, will it make the same power the vg does at less boost? yes it will. Will a 4.5 ltr engine be more reliable at 400hp than a 3.0? yes it will (generally). If both engines are tuned and running correctly, it is a no brainer that bigger is better, the boosted v8's prove this. When boost is added to all engine configurations, bigger engines make more power more reliably.
I love your wikipedia type generalisations there. No shit bigger displacement and more cylinders boosted = more power. So where's all the boosted VH's making a bazillion hp then? Oh besides that one TT in a boat that Nizpro bulit... lol You'll struggle to find any of these setups running gobs of boost. Why? 10.5:1 + boost = bad. Low comp pistons and forged everything then you're talking. Oh but forget the reality when it comes to building engines... Dictionary type responses are so much better.
Actually that's exactly what it is... We're not talking about general bs we're talking about the VH45 and the potential for it to be turbocharged reliably. There are far more things to take into consideration than your classroom definitions on what makes more power.
Classroom definitions my ass, try actually doing these type of things for a living and then you ill have some kind of experience to back up your googling. Pound for pound, the vh45 will make more power and torque, within the limits of its design brief. At 9psi a vh45 will wipe it's ass with a vg30, why you cant see this I have no idea, maybe do a little more googling to get some more knowledge and then come back.
Thank you! My point exactly... It's easy to just buy a crate motor and call it day. I am referring 100% to the limits of a factory motor (VH45) and it's ability to handle HIGH boost applications without addtional modifications. Make sense yet?
I know what you are saying, but on an even par the bigger engine will make the same if not more hp with less boost. Your comparison of a poorly tuned v8 compared to a finely tuned v6 goes both ways so is irrelevent. The turbo vg doesnt make alot of power reliably without mods, and no, 300rwkw isn't alot of power. A boosted vh45 will walk this figure reliably with about 1/2 the boost level. Both engines have very similar technology, both are very strong engines in stock form and both will make good hp, the vh will make more for less. As far as dropping in a stock vh45 in replacement of the TT, I don't know why you would either. Even if the car was na, it is alot cheaper to put a TT in than to convert to a 45. Doesn't make sense to me, the ls1 is a much better conversion that presents an endless array of possiblities so for me that was a better choice. Chrispy or Stephen may have other ideas as to why use a 45.
Ok cool, now this is making some sense! lol Oh it definately will, I am not doubting that. You just dont see it done. I certainly would love to see someone do this properly and show just how strong the VH45 is when all things have been taken into consideration, and the engine modified accordingly. Although pound for pound it will make more power, up to a point unless u crack it open it's just not going to be safe to do so with such high compression. That's why you see these VH45 motors running 5psi and barely a lb more. How will the motor cope at 25psi even with low comp pistons? What are the weak links in the motor once it's taking so much boost? etc I couldn't agree with you more. The aftermarket support for the LS is incredible, and it's already been proven how much power they can make. As said before, for those wanting to keep it Nissan the VH45 is a cool swap. But to take it to the level where you can run alot of boost effectively (and safely) will take a fair bit of work. It wont be easy either because of the lack of aftermarket support and lack of advice from those who have done it before.
that also applies to the VG, so I don't get your point? There are very very few VG's running 25 psi as you mentioned earlier, to which I put to you - what are the weak links in the VG30 engine at this boost level? You seem to be inciting that the VH is weak, whereas to me they are a very strong engine considering they weren't bought out boosted. So to keep everything fair you should really be comparing the implications of turboing a stock VG vs a stock VH...then it will start to make more sense.
Well primarily that alot of r&d went into the turbocharged VG and shares alot of the same fundamental parts as the NA engine wise (block/heads etc). The VH didn't have this luxury. Not that it would be so horrendously weak, not at all... It's just an unknown. I suppose one could compare it more equally to turbocharging a VG30DE and leaving the compression the same versus a VH45 as is.
exactly my point, boosting an NA VG to the same power level or more as a VH at 5psi will result in an epci fail on the VG's behalf. Push them both to the limits of a stock setup and the VH rolls the VG. It's as big a dick length contest trying to say a better running VG30DETT is more powerful than a poorly tuned VH45 T or TT, than to say a V8 ALWAYS wins. I don't know why everyone keeps bloody arguing the point lol :bash:
Yes let's talk facts. You claim this is a theory. "All things EXACTLY even, built by the same person with all the same gear then yes in THEORY." I say it's not theory but fact and you come back with some caveman yokel stuff. BAH
As far as I know ... stock internals As far as I know ... the engine has all stock internals. Though during the major service he replaced a lot of the OEM parts such as water-pump, thermostat, timing-chain, timing-chain guides, seals & gaskets, and cleaning out the crap. I believe he was ordering two of everything when getting parts for my engine (as I ended up using his water-pump after an alignment issue) and mine is completely stock. There were some under-plenum fuel injector piping additions for LPG; but Mark has ditched LPG to continue with petrol so I think it is back to stock in that department. The engine is currently using stock injectors and is just about to run out of puff. He is using an aftermarket computer... Autronic I think. Aftermarket exhaust, custom headers, and Z32 5-speed box. Oh and the dual throttle plenum using either RB20 or RB25 throttle bodies. I believe he could be considering different cams (and pistons) for the future given we had a very quick non-committal discussion about cams and a possible 5.0 litre stroker-kit for my engine from some guy in NZ.
Interesting, do you have any guess as to what the standard (high compression non turbo) pistons are up to, or indeed the rest of the standard internals? Aside from looking a bit naff what was the rationale for losing the standard plenum? Given that the VH45 throttle body and MAF are legendary for their size why go to a twin throttle body setup? Ben
There is a S14 with a big single I know of in the states, another one with 550rwhp I had the vid of the dyno run somewhere. Then there is Jerry's vortech blown S14, maxed out at 430rwhp due to AFM and injectors. Should be sorted soon. There is that TT VH Z32, which apperently has 600hp but hasn't been verified because the owner is a dick. Darin's Patrol, t04z, big muddies and auto and that was 320rwkw+ again restricted by AFM and injectors, 3rd gear AWD wheelspin at 100kph on the highway. The crank, girdle and rods in the VH are all significantly larger than the VG. All the failures I have seen of the VH with boost have been spun big ends, mainly due to oil surge from retaining the front sump.
