20+HP gain for your G50

[BlackBirdVQ]

Like it says in the title, are you interested in a 20+ HP gain in your G50 ?

Say hello to PULLEY set design for our G50.Crank Pulley approx 1.5lbs in weight vs the OEM 20lbs Water Pump pulley- not much weight shead off this item but it will look much cooler than the stocker. This picture is of a SR20VE water pump pulley, VH45DE will be different and finished in polished aluminum.

I have sent a set of STOCK pulleys to have done for us, friend of mine is taking care of all the work etc.

These pulleys will sell for approx 250 dollars or less,

WHO IS INTERESTED ? IF sales do good I will have a custom Cold air intake, headers and exhaust made for our Qs. With Robs ECU and the following mentioned we should have no problem making 400HP and getting BETTER gas mileage with our Qs.

[heywier427]

youve got my attention...

[MileHighQ]

Ok, now I have to get another Q, anyone know of a 94-95 silver, preferbly a T for sale?

[chinaonnitrous]

If Mr. Jes is doing this. Im in.

[jamesmost]

I'm in lmk when ready will PayPalget the headers rolling out as well

[Q45tech]

we should have no problem making 400HP and getting BETTER gas mileage with our Qs..Don't make promises that defy the Laws of Physics............340 Flywheel HP on a accurate engine dyno would be possible. How do you propose improving highway cruise MPG .......All the pre 96 must be emission tested on a dyno and pass the look test [headers].317-319 HP is/was the highest FLYWHEEL obtainable with loud exhaust [no cats], cone filter, and ecu tuning in 65F dyno room. 11,000 mile Motor was out of car!

The last thing an old car with an old radiator needs is underdrive water pump and fan pullies in Summer.

Now pretty polished engine acessories are visually pleasing.

[jamesmost]

we should have no problem making 400HP and getting BETTER gas mileage with our Qs..Don't make promises that defy the Laws of Physics............340 Flywheel HP on a accurate engine dyno would be possible. How do you propose improving highway cruise MPG .......All the pre 96 must be emission tested on a dyno and pass the look test [headers].317-319 HP is/was the highest FLYWHEEL obtainable with loud exhaust [no cats], cone filter, and ecu tuning in 65F dyno room. 11,000 mile Motor was out of car!

The last thing an old car with an old radiator needs is underdrive water pump and fan pullies in Summer.

Now pretty polished engine acessories are visually pleasing.

good point But most of us are more expressive than exacting.bty think i had bad gas w/ the pinging.

[Raxephon]

The last thing an old car with an old radiator needs is underdrive water pump and fan pullies in Summer.

What about a water pump pulley that retains the stock diameter but has less rotational mass?

It wouldn't be a great benefit, but it would still be a benefit.

[Q45tech]

Let me tell you getting 20% above manufacturers specs is something to really crowe about ...................333 Flywheel HP installed in the engine bay without internal mods.

Changing cams and redesigning the intakes and plenum is the best source of power [higher rpm peak HP]............unlikely to gain much low rpm torque beyond the 330-335lb/feet..... a good retune can coax out with real 93 octane [85 MON FUEL]............now using 114 octane another 10-15 lb/ft is possible.

[tkd_q45]

Please tell me how much MPG increase I can get so I can sell the wife on it!

Seriously it would be good to have Dyno sheet proof.

[BlackBirdVQ]

I disagree here on the power....

Have you seen dyno charts of pulleys on a Twin Turbo Z ? They gain some VERY good numbers with just a crank pulley. We are not going to underdrive anything, the pulleys will remain stock size- just light weight. 95% of the power gained with aftermarket pulleys is from the weight reduction- aka rotational mass at the crank.

As for the 20% gain in power, I do NOT see a problem with that what so ever. My Maxima for instance dynos 195WHP stock, with the modifications and tuning I am able to hit 249WHP and I still have factory intake manifold and cams. I have managed to gain 54WHP over stock with simple add ons. Why do you think I can't do the same with the Q ? Properly designed long tube headers with Xpipe 2.5" exhaust I don't see why I wouldn't be able to pick up a total of 30WHP, especially after looking at the OEM manifolds.

ECU has not been tested, but Rob put down almost 300WHP in his Q45 and that was with a JWT ECU. Considering stock Q puts out around 235WHP through its automatic and he put down almost 300 I don't see 400 CRANK HP unreal.

On the side note, since you increase VE of the engine by letting it breathe better your gas mileage WILL increase. I have no problems getting better than EPA estimates of my Maxima. Since you can accelerate better with less strain on the engine in your daily driving, your MPG will increase.

Recap- pulleys will be billet aluminum, NO underdriving just light weight vs heavy weight of the stockers.

In IL they do not do any visual checks, and they won't dyno my Q45 as I made sure the TCS is not disabled so the car will NOT do anything for them on the dyno. They just do a idle test. My 01 Max has zero cats, zero DTCs and I passed emissions with flying colors last year. There is always a way to get through the loop holes in the IM240 testing....

[Q45denver]

No silver, but I have a black 1995 for sale for $4K in Denver.

What are the downsides if any of using a lighter crank pulley? Isn't this also commonly referred to as the harmonic balancer?

[BlackBirdVQ]

Harmonic balancer or crankshaft pulley....

Our engines like all Nissan engines of the last 20 years are internally balanced with no need for any external balancers.

I will have the 1st set soon, and will test it to make sure that the front crank seal doesn't leak (common thing with poorly designed aftermarket pulleys) and then it will be sold to the public.

I am gauging interest in these pulleys to see if there is any interest. You will use the same belts as you have been using to date, there is no extra noise associated with this mod, and the power will be avalible all the time from idle to redline no matter what.

If there is enough interest in this, I will go ahead and get started with other items. I can also get some of the hard to get parts from Japan, if I can get the part # for them from Nissan - I can order em- who wants some chrome mirrors :P ?

[Q45tech]

Flywheel steady state power as measured on an engine water brake dyno not rear wheel tire drum corrected compensated fudged power............is the criteria!

Have you viewed the Q45 crankshaft pulley dampener with its drilled and added weights in individual different locations unit from unit. Each Q45 engine was fine rebalanced via this pulley..........a unique feature of this engine.

[BlackBirdVQ]

Tech,

I compared the pulleys I send out to the ones I have on my Q and they looked identical down to the drilled out spots on the back of the crank pulley.

I hope you didn't assume I was talking bout 400 WHEEL HP here, I was nearly talking bout making 400 CRANK HP.

To me CRANK HP numbers do not mean anything as I do not have a engine dyno to dyno my VQ and VH on. I dyno on a DynoJet 248c which is pretty much industry standard for measuring wheel HP. I do TUNE on a Mustang dyno which is able to simulate load on a engine, letting me tune my A/F and timing maps for different situations.

I doubt Nissan would go to such extreme measures to balance each crankshaft and the pulley. Unless they had some kinda dedicated team of engine builders like AMG does for their engines.... I find it hard to belive Nissan would go to that nuts on this engine. Like I said both of my crank pulleys looked indentical.....

[Q45tech]

I have seen more than 300 1989-90 Q45 engines that appear to be individually balanced..........they seemed to have slowed/stopped this expense in later years or as they saw the correction weights were small in mass. Up to 1993 you ocassionally see corrections weights on the crank pulley.

AS you well know chassis dyno misrepresent rear wheel HP due to faster than possible on the road acceleration due to the drum not weighing as much as the car! Thus making pullies appear better than they really are in gains. Mustang is more accurate when loaded to slow the motor down to real quarter mile and in our case 152 mph redline accelerations.

I have AMG engines [in personal cars] that are not nearly as well balanced as were the early Q engines............they had to, because the larger engines exceeded the optimum bore size and stroke for V8.

Any way the SAE only uses ENGINE DYNOS as a true representation of engine power. Every professional engine builder, I know has an engine dyno.

Don't cofuse the initial engines with the later productions.

[MileHighQ]

Really? Got any pictures? shoot me an email

[email protected]

I am very interested!

[ddrumman]

Don't cofuse the initial engines with the later productions.

Can you expand a little more?It makes sense that they (Nissan) would want to come out with a bang.What about the "chain guide" issue? When you say "initial" do you mean G50 vs. Y33 etc?

[elwesso]

No we're just talking G50.. The later engines probably were not as well made as the earlier ones, but it seems as if they last nearly as long...

Surely more later engines have survived due to the chain guides.

[squeefoo]

Can you expand a little more?

Way off topic... Is that a picture of Harvey Mason in your avatar?

[ddrumman]

Way off topic... Is that a picture of Harvey Mason in your avatar?

Why is it way off topic?

No it's Elvin.

[rsiwicki]

Looking like a really nice good modification, IMO. Thank goodness I no longer have the Q as I would be all over these with the first set on my car. I know the Vh45 has an ulimate limit on HP figures, but I say what the hell...these will at least allow the engine to rev faster to redline than without and thereby reducing 1/4 ET's so either way 10HP on the crank or faster rev's to redline you still reduce your acceleration times.

Hell....look at my dyno graphs. Even if you don't believe the increase in peak HP you got to believe the flatline HP curve. I am putting down a significant amount of average HP per rpm band from 3,500~7,000rpms. What I am trying to say is that even if my overall peak HP did not increase significantly (I do believe it did), my average HP over the same range did significantly and therefore translates to faster acceleration rates. There is more than one way to lower 1/4 ET's.
Modified by rsiwicki at 4:49 PM 4/18/2006

[elwesso]

I agree Rob... I will be slapping this bad boy on my Q as soon as I have one for an active/HICAS Q made

[Q45tech]

Had a discussion with the techs at other shops, they inform me that they still see balance weights and drilled points on even late model engine [94] crank pullies.

[elwesso]

I know i have a balance weight on my VH45.

[heywier427]

so what does all this balacing crap mean??? will it just not idle as smooth. will it rob horsepower?

will it internally disrupt or wear out the motor faster?

were all looking for free or close free to horsepower. some people want to keep the elegance and smootheness, and some people dont care as much. i personally dont care as much. as long as im not compromising performance, or my pocket.

all opinionated post should keep this in mind. dont just give your 2 cents back it up with some kind of informative...something

[heywier427]

and wes this is not a poke at you, i just youre reply.

[Rex]

Not to oversimplifiy or use too much generalization, but if the pulley is "weight balanced", then it is similar to a Harmonic Balancer. Here's a little something (I stole) that might help.

Harmonic Balancer (vibration Damper) The harmonic balancer, or vibration damper, is a device connected to the crankshaft to lessen the torsional vibration. When the cylinders fire, power gets transmitted through the crankshaft. The front of the crankshaft takes the brunt of this power, so it often moves before the rear of the crankshaft. This causes a twisting motion. Then, when the power is removed from the front, the halfway twisted shaft unwinds and snaps back in the opposite direction. Although this unwinding process is quite small, it causes "torsional vibration." To prevent this vibration, a harmonic balancer is attached to the front part of the crankshaft that's causing all the trouble. The balancer is made of two pieces connected by rubber plugs, spring loaded friction discs, or both.

When the power from the cylinder hits the front of the crankshaft, it tries to twist the heavy part of the damper, but ends up twisting the rubber or discs connecting the two parts of the damper. The front of the crank can't speed up as much with the damper attached; the force is used to twist the rubber and speed up the damper wheel. This keeps the crankshaft operation calm.

[Q45tech]

Hard for people to understand that the early Q engine was very exotic compared to most all production and even specialty custom engines. Sure there was cost cutting in some areas but way over spending in others. It was way over built because it was Nissans first V8..........they have learned to progressively decontent V8 to reduce costs over the 15 years.

Other than the chain guide material [selected by chain manufacturer] and valve cover leaks what goes wrong with the use of as designed fuels and 90 day maintenance.

[maxnix]

so what does all this balacing crap mean??? will it just not idle as smooth. will it rob horsepower?

will it internally disrupt or wear out the motor faster?

Yes to all latter three, in as much as they are understandable.