Anyone had a GPX 4500 modified - does it work??

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Post  Kon61gold on Sun Dec 01, 2019 2:29 pm

My mistake fellas. Thanks for correcting me on this one koeh/rowdy. I should have said bored out to a 161. The original EH Holdens did first come out with a 149ci 2400cc attached to a 3 speed manual gearbox, or 3 speed automatic transmission with column shift.
The 179ci 2900cc was first introduced on the EH Holden with a manual gearbox & called the EH-S4.

Cheers Kon. T25


Last edited by Kon61gold on Sun Dec 01, 2019 5:28 pm; edited 2 times in total
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Post  koeh on Sun Dec 01, 2019 5:08 pm

ozgold 041 wrote:
One can't just go putting in a 327 Chevy V8, in a 161 EH Holden without re-engineering the chassis & who knows what else, to suit the extra horsepower.  Shocked
Everything (within reason) can be spruced up to look better or perform better. It all comes down to what the modder states can be achieved & what to expect & or what the clients expectations are from such a modification, for this is the purpose of all/any designed aftermarket part or modification.
Bottom line, its not what an aftermarket part or modification costs, but more in the fact that ones expectations have been met/satisfied, then that's all there is to it. 

Cheers Kon. T25

The EH never came out with a 161 [/quote]

=================================================================================


Hello Koeh.


I beg to differ.      Re, the EH Holden on release, had a 161 new motor in them.


My uncle Jack bought a 161 wagon early on, not long after you could have a choice of the 161 or a 179 engine.


My dad bought the 179 in a wagon, I used to drive this when I turned 18 just months later.

Cheers ozgold.[/quote]

I don’t think so buddy
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Post  Kon61gold on Sun Dec 01, 2019 5:41 pm

Thanks for correcting me on this one Koeh. It brought back some memories, driving modded, done up EH sedans, back in the the late 70's as young fellas.

Cheers Kon. T25
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Post  akko on Sun Dec 01, 2019 9:04 pm

My memory is failing me these days, but long term is not too bad. I thought the EH came out with a 149 and 179, then the 161 came with the HD model and 161 and 186 for the HR

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Post  Kon61gold on Sun Dec 01, 2019 10:10 pm

Only the Holden HR produced from 66 to 68 came with a standard 2.6L or 161 motor, except for the premier version, which came with a 186cu 3.0L in line six cylinder.
The HD series (released early 1965) was offered with 3 versions of the red inline 6 cylinder motor. The 149cu 2.4L being standard, a 179cu 2.9L for the premier versions as well as being an option in place of the 149cu & a 140hp X2 version, modified with twin carburettors, high lift cam shaft, new inlet & exhaust manifolds, coupled to a low restriction exhaust system.
Shocked What am I saying, how did I get caught up in all this? V02 Damn that 161 mistake. V04
Hey fellas, are we still on the subject of modifications on detectors & their performance? Shocked Q35

Cheers Kon. Q11 T25
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Post  Pebbles on Mon Dec 02, 2019 12:55 pm

The fact that the 4500 has been around for so long in its factory form should tell you something.

AFAIK the only modification of any significance to the 4500 was a fine gold timing. It was done by Minelab when it became the GPX 5000!
From many posts on various forums it is clear, that for the average punter, an aftermarket coil is probably their best option for improved performance.

On another topic, this might help throw some light on the EH motor discussion: http://holdenpaedia.oldholden.com/Holden_History_EH

As a young bloke, I always wanted an EH station wagon, but it was more than I could afford then.  The EH Premier wagon was an impossible dream

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Post  Kon61gold on Mon Dec 02, 2019 3:11 pm

Well said Pebbles. I too believe there is more improvement in way of coil design.
One thing I cannot understand is, why even introduce an Enhance mode (GPX series) or audio smoothing modes (such that in the 7000) or any form of ground noise cancelling feature, or the option of a "Normal Timing" where it can only be used only under the most favourable of ground conditions?  Why not leave the detectors output frequency/power at its maximum, without introducing any form of dumbing down ground noise filters & work around a coil type/winding, which brings out the best of all worlds, for I'm sure it can be achieved.
There is nothing worse than knowing one has another, say 30% extra power under the bonnet (so to speak) of which one cannot use, less under the most perfect/favourable of ground conditions (detector wise), or as in the car part, road/track.

Cheers Kon.  T25
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Post  joe82 on Mon Dec 02, 2019 5:30 pm

I try to not use the ground and audio smoothings on the 7000, I have done tests proving that by using these smoothings you are missing gold, I have gone over a patch a few times (gridded areas ) turned off the ground and audio settings and gone over the same gridded area and got 8 more small nuggets over the 6'deep mark mind you also upping the sens from 13 to 17

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Post  Kon61gold on Mon Dec 02, 2019 6:16 pm

Spot on Joe. Now imagine having a coil, wound to run quietly/smooth in Normal General on the GPZ 7000, or whilst in Normal mode on the GPX series detectors, capable of handling most type of in-ground mineralization,  "with" the added advantage of upping the gain Shocked cheers
If spiral wound coils introduced/manufactured by our leading Australian coil & overseas manufacturers were no good, (so to speak) would they be wasting their time/money making them for general detecting?
Out of the myriad of coil types/windings out there, surely there'd be one or two, that would best suit being run in the "Genera Normal" (for the GPZ 7000) & or in Normal for the GPX series detectors, giving maximum coil performance, with minimum ground noise, without the use of any ground noise reducing filters?

Cheers Kon.  T25
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Post  koeh on Mon Dec 02, 2019 6:52 pm

akko wrote:My memory is failing me these days, but long term is not too bad. I thought the EH came out with a 149 and 179, then the 161 came with the HD model and 161 and 186 for the HR

Yeah you are correct 149 and 179 release date 13th August 1963,same as my birthday just not the year,my EH has a fuel injected Holden 304,twice as many gears as original it’s got 6 forward gears now,spent way too much money on it to stop,
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Post  joe82 on Tue Dec 03, 2019 6:32 am

the x coil mabie I found using the 12x6 xcoil on my 5000 I could run normal max gain and sensitivity superised the shist out of me Cool

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