Richard's 620ZX Coupe

[260DET]

Baby is home and happily garaged, needs more stuff done though including a dyno tune. Weight. Pro reckons it's about 1000kg with the alloy V8, it's certainly lighter, sitting about an inch higher on 450 lb springs at the front and hardly heavy enough at the front to tip the trailer down when it's loaded. It will have to be moved forwards to get a decent balance. Zed's weight distribution has to be 50/50 now or more at the rear.

 

New camera = pic problem.

[dat2kman]

Pure speculation and guesstimates. Love it.

Morgan Park has weight scales, do it by half, then whole, then other half.

Bit more accurate.

[260DET]

Of course Jason, as I said, the ~1000kg was The Pro's guesstimate. It is what it is, I am surprised how much lighter it appears to be though which is a point that may be of interest to others.

[tir33d]

Don't they weigh a tonne anyway standard.

 

[dat2kman]

Don't they weigh a tonne anyway standard.

2 seaters 1280 kg

2+2 are 1350 kg

[260DET]

Decided to get a cam before the dyno tune, it's going to be a while yet before it's a track goer but something like 400+ horses at the wheels and V8 torque should make the wait worth while. Plan to change the diff from a 3.9 to a 3.7 too.

[PeterAllen]

...Morgan Park has weight scales, do it by half, then whole, then other half.

Bit more accurate.

 

If you weigh the front axle and then weigh the whole car why would need to weigh the rear axle... oh I forgot, you're a Queenslander.

[luvemfast]

If you weigh the front axle and then weigh the whole car why would need to weigh the rear axle... oh I forgot, you're a Queenslander.

BOOM!!!!

[dat2kman]

BECOS

We all know that the weight scales at Morgan Park give out inaccurate readings when you do front half/back half of any car

DER!

When we do whole car, it is accurate, as it is a single large rectangular metal plate, that needs all four wheels on it for accuracy ( it's pretty good, picks up a 2kg change, ie a Fire ext+helmet!)

 

Just putting a pair of wheels on it, whatever is underneath the plate, that registers the wright, it doesnt like it.

 

It's a Queensland thing, you Southern type folk would not understand,,,,,,,

[260DET]

But Jason you said "Morgan Park has weight scales, do it by half, then whole, then other half" So what is the point in weighing half if it's not accurate weighing a half. You wouldn't be giving me false info would you?

[dat2kman]

Take it to Leda or Accurate, they will corner weight it, with your eqivalent weight in driver seat, do it front/rear and diagonals, to get it right.

MP dont like you weighing fronts and backs, as the plate thingy underneath does'nt like it.

The two halves do not equal the whole., hence do the halves, plus the whole!

 

Wendafuq i give you dis/mis-informashons?

[260DET]

Ken Graham measured the corner weightings a few years ago but there was no real scope to move weight around to even it all up, plus I don't agree with adjusting individual coil heights to even things up. So corner weights are only of academic interest to me.

[tir33d]

? I know what mine weighs, you really think your going to be under 1000kg. How heavy with old motor?

 

Doing the cam change is the smart thing, reliable 7000rpm and power all the way.

 

I am currently changing back to 3.9. Work out your top speed with your gearing at 7000rpm. You will find that you don't want to go much faster. The torque will naturally keep you in a higher gear.

 

If you have height separate from preload on your coilovers you must preload to a measurement, I only changed my preload by up to 2mm per corner to move weight around. I spent a whole weekend on scales and ended up with a 50% cross. There was no more gear to move around inside the car. One friend want me to cut some of the rollcage to put it under tension, reweld and pull weight. That I didn't do. I ended up with 40kg heavier in total on drivers side, with fuel and driver. 20kg front and 20kg rear.

 

 

 

 

[260DET]

You have a six speed? Mine is a short fifth gear TKO five speed, assuming 250kph at PI and Bathurst a 3.7 would be kinder to the engine than the present 3.9. The car's lap time limitation will be me, not something to do with the car

 

Weight. I have a Tilta trailer and now have to get more weight forward so it goes down and puts some weight on the tow bar which indicates less front weight as the rear would be pretty much the same. But the total is probably not down to 1000kg although the f'glass doors have saved a heap too.

[260DET]

While I think of it, someone on another forum quoted a LS1 as weighing 195kg and a VG30DETT as 285kg, 90kg difference The LS3 would weigh about the same as a LS1 while the original VG30DET would be about the same as a VG30DETT, maybe a touch lighter. If those figures are correct then this is going to be a very interesting car to drive in anger 

 

Unfortunately the car now has to go into storage for a while but it will be back.

[260DET]

Update note just to say that the car is still in storage simply because there is no room for it at home at present

 

On the engine conversion, in retrospect a DBW accelerator would have been a better option but the present Haltech won't run it anyway although their new Elite ECU will. Now have a 3.7 torsen LSD to use as well as the present 3.9 R200, 3.7 would be better for Phillip Island and Bathurst.

 

And that's about it, no track car is not a good situation to be in so sympathy to those who for whatever reason are in the same situation.

[260DET]

Update. There is a lot about to happen, for the LS3 there is a Crane cam, valve springs and trunnion kit to be fitted which will bring the engine power up to a engine dyno tested 520hp with a performance improvement throughout the rev range over stock.

 

More exciting/crazy is that the Zed is going to be fitted with a GM 4L80E auto together with a Powertrain Control Solutions valve body and 2000 controller. The whole idea is to have an auto that is circuit compatible, particularly concerning engine braking and smooth downshifting. The options that will be available are almost endless eg the torque converter will have a built in clutch that when engaged in effect can change an auto to a manual fully or partially in that the engagement/disengagement points will be entirely programmable. The effect of this might be, for example, that the TC clutch could be dis/engaged during shifts to act as a cushion or help create a seamless shift.

 

This is one of those subjects where pics don't tell much but when the PCS stuff arrives in the next few weeks pics may be sort of appropriate.

[dat2kman]

Once fitted, and running, let us know the neddies at the back wheels.

Be interesting to see how much drop from your engine dyno horsepiwer figure of 520.

 

The PCS thing is programmable? And will throttle blip on downchanges?

[260DET]

With this sort of auto there can be no downshift throttle blip because there is no 'gap' between shifts, later type autos can have a programmable  'gap' which means that a blip can be made between shifts. But there are more ways to skin a cat which is what this PCS stuff is all about, providing programmable options.

[260DET]

Yay, finally booked in to AM Auto, Noosaville, to do all the outstanding work including engine upgrade, drive by wire throttle conversion, Haltech Elite full sequential ECU, dyno tune, 4L80E auto conversion with sequential shift and PCS programmable electronic control unit. Plus a few other minor things

[260DET]

The 4L80E conversion is not going to happen right now, don't ask, but at least in a few weeks there will be a Z that can be taken down the road for some Wednesday practice fun at MP

[C.A.R.]

Turbo Yoda won't be happy about that.

[260DET]

There is a whole heap of other stuff to be done, don't you go around making false assumptions dude.

[260DET]

Drove from Warwick to Brisbane to pick up the Zed, then drove to Noosaville to leave it with the workshop then drove back to Warwick via Brisbane. Towing through Brisbane traffic, oh joy. Anyway, given that the auto guru decided to go on holidays , it's not going to have one fitted right now. The manual will do for a while, I just want to get it out on the track and drive the bloody thing. Hopefully that will happen in a couple of weeks.

[dat2kman]

You're putting the Leylamd Bros to shame, these epic road trips,,,,