Nel Tornado Depth Comparison.

[Rhencullen]

Has anyone done "in the ground" depth tests of the Nel Tornado coil versus the stock coil on the 400i, and if so what were the results?
And besides a little extra weight and more tricky pinpointing (so I've heard), any other impressions of this coil over the stock one? (Which itself is pretty good!).

[Koala]

there's so many variables

Coils are mass produced and vary slightly

Hot stock vs poor nel
Hot nel vs poor stock

are the two extreme's

heres an air test



look closely you will see the Nel coil targets are pushed more into the scratchy zone so the difference isnt as big as it looks

Here in Cheshire I normally loose 1/3 or more of any depth increase in the ground. So a depth increase of one cm is closer to 5 or 6 mm in the ground

Depth isnt everything. Stability, coverage being two of many.

Confidence is another. If you change coil and spend more time with the new coil you will eventually find something, reinforcing' the belief its much better.

to think by changing coil you will find a lot more on the same ground is not the case. The amount targets extra is extremely small

and on some fields you will find less due to iron masking

[Rhencullen]

Thanks Koala - some food for thought there.
So aside from the quality control variations you mention, in a head to head test does the Tornado have the edge purely on depth? Talking specifically about the 400i.

[Koala]

Thanks Koala - some food for thought there.
So aside from the quality control variations you mention, in a head to head test does the Tornado have the edge purely on depth? Talking specifically about the 400i.

yes and no

depends on target size and ground conditions

but all things equal

on dry sand

Aluminium cans quite a bit deeper

pre decimal coppers a bit deeper

and the smaller you go the less the difference

The worse the ground condition the less the difference

and there becomes a point where it will become worse.

dont ask me where the swap on size is. I would "guess" around a modern copper 1p be fairly close in depth which is quite a thick coin.

On the wet beach the standard coil normally produces better results than a tornado on a AT Pro here in the NW your mileage might be different especially if you are on SW beaches

[Rhencullen]

Thanks Koala, good information as always
As I mainly hunt on open pasture that hasn't been turned over for many years, I'm hoping for a little more depth, even if its marginal. If nothing else, the extra ground coverage of the bigger coil might be useful in that environment.

[Bypass2]

Im in a grassed field whitch as not been turned over for 30years at least grassed with horses on it. using a garrett ace 400i standard coil the 400i very good detector found some coins and buttons and other things. going back over the same field with 400i and nel tornando coil and found more coins and other things. I will show you a picture with what I found with the 400i standard coil. and what i found with the 400i and the nel tornado coil on it. with the nel tornado coil for me I have found things at least 3/4 inches deeper approx than the standard coil with what I have found on the second time round the field

[Rhencullen]

That would be very interesting to me - thanks.
For clarification, is the "at least 3/4 inches" depth increase (as you have written it) three-quarters of an inch, or three to four inches?

[Bypass2]

First picture 400i standard coil. Second picture 400i with nel tornado coil. 3inches/4inches deeper on the same field where I have already been with the standard coil. The 400i with the standard coil is a great detector.

[ma larkin]

I have recently changed from the stock coil to the tornado. My own paddock, which I thought I had done to the bitter end threw up 3 more coins and 4 buttons ( It is only 1 acre so not bad... and as I will explain in a minute I can only detect on about 1/4 of it, maybe less). Other fields I have detected on before with the stock coil have again given more things with the tornado.
The downsides are that pinpointing is awful. I often have to dig a big hole, and then another hole next to it! It also finds more deep, bigger targets which give off very good signals I have found. I have found more deep large iron than ever before.
The reason I can only detect in a small part of my paddock is because we have national grid pylon wires running over it. The tornado really is super sensitive and if we get even close to the wires the machine goes crazy, to the extent that I have to turn the sensitivity down to about 2 or 3 bars which seems pointless. The stock coil wasn't so bad with the wires and I could detect right the way around. The tornado does take some getting used to, but all in all I think I have found previously missed items with it.

[Bypass2]

Found these yesterday also on the same field with the garrett 400i and the nel tornado coil same field I had done with the 400i with the standard coil

[theoriginalfatcat]

I’m not sure this ‘second time around’ comparison is totally accurate.

I have a 400i stock coil. And if I go back over previously detected fields it’s quite common to pick up new items. I always go low and slow and quite often use lines too.

[Bypass2]

I am on my second time around the same field with the 400i with the nel tornado coil and I am still finding things. First time around the field was with the 400i with standard coil i found loads of things so in my case the 400i with the nel tornado coil is still finding more things. have not finished the field yet so maybe more to find ?

[Dave The Slave]

I’m not sure this ‘second time around’ comparison is totally accurate.

I have a 400i stock coil. And if I go back over previously detected fields it’s quite common to pick up new items. I always go low and slow and quite often use lines too.

Have to agree with this, you will always find the odd item that you have missed from an area you have checked several times.
Only went to the Nel Tornado as the stock coil was damaged after 4 seasons of stony ground made it unusable. Was going to replace with the stock coil but the Nel was actually cheaper. Better balance and gets thru stubble slightly easier. Inland cannot compare depth, as the ground is stony and fairly shallow. On the beach, have not noticed any significant change of depth.
Cheers,
Dave.

[Koala]

I’m not sure this ‘second time around’ comparison is totally accurate.

I have a 400i stock coil. And if I go back over previously detected fields it’s quite common to pick up new items. I always go low and slow and quite often use lines too.

correct

I know people that are still finding things from fields that they have been detecting on regularly for many years with exactly the same setup.

[Bypass2]

I’m not sure this ‘second time around’ comparison is totally accurate.

I have a 400i stock coil. And if I go back over previously detected fields it’s quite common to pick up new items. I always go low and slow and quite often use lines too.

Second time around the field I have found at least 35 more things with the garrett 400i with the nel tornado coil deeper finds than the first time round with the garrett 400i standard coil.