hi power VH45

[AGM]

I have spoken at lenght with JWT about both lower diff gears and the lower first gear in the 51X65. They advise that as long as you bump up your rev limiter in the ECU, there should be no problem. You just rev higher in first and second gear, before each change, which is actually what I am chasing for overall acceleration from a standing start.

The JWT Trimode is identical through all years 1990-1996. If you don't modify the ECU rev limiter, the TCU will bump into the ECU rev limiter, resulting in some strange shifts.

The JWT actually bumps up the transmission shift points as a standard sports modification.

Regards

AGM

[sijoko]

You can have a reputable shop such as LevelTen install the 1st and 2nd gearset from the 90-93 Q into a 94-96 Q transmission.

I had it done when my trans was rebuilt by LevelTen. No problems except for the slight delay in downshift at high speeds which can be corrected with the Jim Wolf TCU.

I would even think that you could even install the trans from a 90-93 Q into a 94-96 without any problems. But, you should check with LevelTen first on that. They are the experts when it comes to the RE4R03A.

-sijoko

[Bart ristuccia]

Q45TECH

Has anybody had any experiance with head porting on the VH45 what sort of flow gains have been acheived, would the 1990 model heads (dual port) have more flow potential than the later models with the single ports?

[AGM]

BART,

The reason I purchased the 89/90 engine was due to the ease of flowtesting and porting the heads, due to the port shape.

Also as stock, the 89-93 has more low down tourque than 94-96.

The 1989/90 intake valves are flush with the head and would be easier to modify for larger valves than the 94-96 heads.

Greg Gower, who builds top fuel cars such as the legendary "Green Machine" has taken the time to look at my engine. He was so blown away by the standard 6 bolt mains, web design, quad cam he is keen to work on the heads.

If you want to get some head work done by Greg Gower, I can organise this for you.

It is the same with John Zappia AKA "ZAPS RAT".

They both thought the Lexus motor was good until they saw the VH45DE

Regards

AGM

[Bart ristuccia]

The torque is lower because the 94/96 is a 4.1L is it?

[AGM]

Bart,

The VH41DE (4.1 Litre) was 96 to ? (I think it was till 2000)

The VH45DE (4.5 Litre) ran from 89 to 96.

The 94 - 96 (second generation) had stricter emmision laws to comply with than the 89-93 (first generation).

Hence a lot of guys favour the first generation VH45DE. Just don't forget to change those chain guides from plastic to metal.

Regards

AGM

[Bart ristuccia]

OK that makes it much clearer.

Thank You

Are their any engine markings to indicate what year model and capacity? ie 4.1 or 4.5

[AGM]

Bart,

My experiance is ONLY with the VH45DE.

The way I would tell the diference between a first and second generation VH45DE from an external inspection only, would be: -

1. Different style injector cover2. Different crank angle sensor location.

No doubt, Q45tech will have more than this.

Regards

AGM

[DAEDALUS]

There are markings (serial number and VH45 stamp), but they are at the very rear of the block and very hard to see. They apply to the block only, so they won't indicate whether the engine is 1st or 2nd gen.

[Chally]

FYI, the 4.1l was built from 92, but it didn't appear in the Infiniti until around 97. It was in the Y32 Cima.

[Bart]

to q45tech

is it true the vh45 can be stroked and bored to 6 litres???

[Q45tech]

They make a $7,000 stroker kit in Japan which increases the volume to 4.95 liters.......wouldn't think you could increase the bore without recasting the heads........bore to bore spacing and water jacket thinness.Aluminum engines usually can't be bumped more than 15%.

The new 5.6 V8 is a total redesign for trucks.

[AZhitman]

That'd be yummy!

Q50.... Love the sound of that!

[szh]

That'd be yummy!

Q50.... Love the sound of that!

No, no, no! They need to make the Z60.

Z60 = 12 cylinder V12.

Z

[peakhp]

Wish me luck guys. The engine came last week and I've already got it torn down, hehe. Finally gonna build the monster..

I need to get in contact with the guy in australia that is doing the VH drag buildup and was published in Zoom mag. Does anyone know him or anything?

Also I'm looking for the bosch split spray pattern fuel injectors like they use in Mercedes. Does anyone know where I can pick up a set of these?

regards,

Peakhp

[PalmerWMD]

peak we have a couple of Aussies her with VH45DE hi hp engines.I <think> the one you are looking for is "AGM" on this board.

Go to "members" section and do a search for him then email via profile.

Fred..

[nlzmo400r]

good luck, this will trulyl be an amazing motor, what kind of car is it going into again? will it make its way back into the Q?

[peakhp]

This motor will be finding its way into a 4th gen 300Z. Most of the complications are mostly packaging related, which is assumed with a swap of this nature. Initially our concern was one of its brute length and width fitting into such a small engine bay, but this was actually less of an issue than its height. The hood slopes down towards the front and the radiator filler neck ends up having something like a 4 inch interferance, either that or a ridiculous looking hood, neither of which I will settle for. So I'll probably weld a new flange for the neck, and will make a new intake plenum for obvious reasons. Other concerns relate to the rack & pinion running under the engine and if there is clearance. Ideally I'd like to mount the engine as low as possible for CG and packaging reasons, which suggests using a dry sump setup with a very shallow oil pan, but is it necessary?, we will see. The rack still needs to be under the engine so how much space can really be found? So these simple things are the sort that are the most difficult to resolve because we can easily fall into the routine of touching everything. First its relocating something, then before you know it we have front halved the car, lol.

My guide for this project is to change as little as possible, keep expenses down by asking what would happen if we didn't do X, or use Y, or have a fancy new Z. Sometimes you just *need* certain things to do the job right and sometimes they are just nice to have.

btw, we are calling it the 450Z not really all that creative, but why break with tradition.

[nlzmo400r]

haha, keeping the tradition alive, i like that , best of luck with the swap, sounds like you're off to one hell of a start so far

[PalmerWMD]

btw, we are calling it the 450Z not really all that creative, but why break with tradition.

Sounds really cool!

Please keep us posted maybe even with progress pics.

Fred...

[sachmo12345]

how much HP does one of those modded Q45 engines make?

[nlzmo400r]

all depends on how modded you go of course

[peakhp]

With everything there are levels of performance that are usually commensurate with the quality of materials, design of components, and engineering involved in building it properly. Likewise the intended use also plays the most important role (during engineering) in its power delivery.

If you are dropping it in a drag car you want ultimate peak hp, and then keep it in that powerband all day long. For a road race car, you want area maximum area under the curve and for easiest driver control you want a pretty much flat torque curve, er line.

Building these two engines is completely different, even though it involves the same basic components. So in a long winded answer peak hp is only a fraction of the answer. Adam Clarke is building a drag motor in the mid thousands, will it be driveable around town? no but thats not the point. I have targeted a 60/40 drag/race design. So you'll still roll big numbers, and it will still have a wide powerband.

Final dyno curve is affected by turbo choice (or super charger choice), intercooler, and tuning. I'm not going to put a number out there, but I'll leave you with this. I worked with the VG30's for a while and they'll put down 500,600,700 hp, not easily or inexpensively, but they'll do it. The infiniti is basically a VG30 * 1.5 (not really, but for illustration purposes of this thread the differences are moot).

So.. my buddy who owns CJmotorsports highly recommended this race engine builder to me. I'm gonna give him a call tomorrow and see what he says he can do with this block. Apparently its the same engine builder that built the block in the venom racing neon drag car.

[s13sr20chris]

i can see your reasoning with the vgX1.5 thing. the vg was developed into the ve(temporarily). the ve has some similar charachteristics the the vh. i cant remember if it was a vh41 or a 45, but i saw one side by side with a ve at nissan tech school recently. the valvetrain was similar, the t-chain and cover was similar, the whole thing just seemed to have like archetechture(sp?).

[Bart1]

hey peakhp how did you go with VH45??

[peakhp]

Still moving forward.. I got a pretty good idea of what I need to do on the engine build side of things. But there's quite a bit to do outside the engine as well. Right now I've got the VH45 hovering in the engine bay of the Z so I can plan the piping, exhaust, engine mounts, transmission clearance in the tunnel, hood clearance, then the tail shaft mount. I'm trying to keep the engine package as modular as I can, but hehe the turbos are huge. The Oil pan interferes with the front anti-sway bar, PS rack and pinion hoses need to be re-routed slightly. But overall I think its a damn fine hybrid.

Our engineer is designing a killer intake plenum to replace the stock aluminum devil incarnation. That will let us run a dual throttle body set up which works best with twin turbos. Also if all goes well nothing should affect the beautiful hood line of the Z32. I just cringe at the thought of mustangs and f-bodies with those obnoxius cowls that stick up 4-6 inches into the sky to make room for their supercharged blow through carburator set up. So I absolutely want this to end up being a drop in.

peakhp

[Bart1]

sounds like it comming along it reminds me of my project, sticking an RB30T in the Torana it has its fair amount of dramas.

Just one more question i dont think this has been answered before but what is the measurement of vh45 in terms of height FROM the cam covers (widest piont of the engine) down to the sump??

I know the over all height has bee done here and the width length etc but this is one measuement i need.

[maxnix]

They seem to feature the VH45DD, which is unavailable outside of Japan.

That should be VK45DD, which is not available in Japan as of the 2004 model year. They went back to the VK45DE.

Too bad members cannot edit posted incorrect information after a few hours. Now we have to add posts, which dilutes the information on the board. The board should not be crippled in this way.

[peakhp]

Bart1,

The measured distance in the vertical from the bottom of the block to the lowest point of the cam cover is approx 9 inches. Add approx 5.5-6 inches for the oil pan. So I hope that helps you with your measurements.

I'll try to snap a few pictures in the meantime..

Peakhp

[PalmerWMD]

Too bad members cannot edit posted incorrect information after a few hours. Now we have to add posts, which dilutes the information on the board. The board should not be crippled in this way.

I agree, I will bring this up with the other admins.

Fred..