BlackIce
Nov 16 2002, 10:32 AM
This is a follow on from the Smoked D2 thread.
We all know there's a lotta mods out there for the D2.. list 'em in this thread so we may all void our D2's warranty !
Not that I own one, but one day..
BTW, try and list a bit more than "You can make them 1ohm stable".. thats pretty useless .
Step by step instructions including componant lists, or links to sites/forums that explain the mods would be great.
For anyone who doesn't know what a D2 is:
http://www.earthquakesound.com/phd2.htm
ripped
Nov 16 2002, 04:19 PM
i think some of the mods come straight from EQ
BlackIce
Nov 18 2002, 01:02 PM
Yeah but have you ever tried getting the info outta EQ USA ? Even the Aussie distro's for EQ can't get a straight answer out of them most of the time .
So if you guys have any web links, or know any mods, please do share.
ripped
Nov 18 2002, 01:11 PM
even some of the top level competitors don't know what mods have been done!
all they know is that the mod does x to the amp, they don't know how it is done.
the more simple mods, like the fuse mod or whatever it is, people in australia would know how to do that one. but for the more hardcore mods, i think only EQ would know, and they wouldn't tell you i don't think
NUTTTR
Nov 19 2002, 02:35 AM
Depends on what type of mod you are trying to do.... If it's a regulated power supply, or semi regulated, then you'd be looking at changing the mosfets on the power supply side with ones that handle a MUCH higher current (lower ohmage stability), and the output transistors/fets to ones that handle higher current... But, the main p/s must be able to handle the current, otherwise it won't be more powerful at all, essentially, once changing the fets, you'll have a "high current" amplifer, which will increase it's power output into 1 ohm, simply by having more amps available for "peaks", the voltage, however, usually stays the same.... Voltage on an amp, is hard to change, however, amps, generally is a much simpler way...
Hope this helps
Aaron
WeaponX
Nov 23 2002, 09:34 PM
Yeh there is a heap of different mods you can do,
Yeh no-one wants to tell you because they dont wanna get blamed if something goes wrong.
Check out Termpro under "Advanced Topics" and search for D2 mods ,there was a good thread there with type of caps to add to the filter stage.
Another ex-factory mod was to cut a resistor leg to increase output.
I modded my old four (extra caps) and looking back at it dont know if it really made them put out that much extra, this is a sport of decimal places though so every little bit does help.
The D2 punches out enough in stock trim anyway I reckon, good enough for Cameron to be in the 150's in Street 1-2..
Earthquake
Dec 7 2002, 04:23 PM
I have heard of this guy on Termpro lurking the D2 schematics off a Earthquake guru in the US, and with this he waqs able to sucessfully mod his amplifier to handle 0.5ohm loads without smoking.
I should try and find it again!
Bodyjar
Dec 7 2002, 04:45 PM
But that wouldnt be Street legal?
Bassaholic
Dec 7 2002, 05:41 PM
It has to be "commercially available" meaning Earthquake (the company, not the CAA user..) has to be the one that does the mod..
But there is ABSOLUTELY NO WAY that the amp is 0.5 ohm stable.. even for burps.. you will find that the actual impedance required for it not to smoke will be significantly higher
ripped
Dec 7 2002, 09:51 PM
pig75 has a d2 schematic...
bassA. people have burped a d2 at 0.25ohms without blowing up. i know there would be a little rise, but the main concern is voltage. if you keep the voltage up the amp will live and play lower loads.
Andu
Dec 7 2002, 10:30 PM
QUOTE
Originally posted by Bassaholic:
But there is ABSOLUTELY NO WAY that the amp is 0.5 ohm stable.. even for burps.. you will find that the actual impedance required for it not to smoke will be significantly higher
Kickerboy was running a D2 in his car at 0.5ohm for a week after final battle daily driven!!! crazy bastard
In my quest to run 0.5ohm I bought a clamp ammeter today... anyways my box is tuned no where near where I thought it was lol 37hz it hits rock bottom impedence of 2.136ohms.... and impedence peaks at 47hz at 3.917ohms, so if I load my amp down to 0.5 it'll be seeing a 0.97ohm load at 47hz... hmmm not much impedence rise
WinISD says it should rise to 6ohms @ 50hz lol so much for WinISD's impedence plot
Bassaholic
Dec 7 2002, 11:40 PM
By "stable" at a load, I mean at full volume.. For burps I mean for 3 seconds or so.. Actual impedance will most likely be at least around 1 ohm..
rippedskin - have you ever considered that the extra voltage drop might be a side effect of the amp drawing too much current?
Just trying to save those poor innocent phd2s from being *accidentally* fried
BlackIce
Dec 8 2002, 11:24 AM
I'm only asking so I can say to Mr.EQ "Hey, can you do *insert mod* for me ?" .
Tarwahh
Dec 8 2002, 01:07 PM
QUOTE
Originally posted by BlackIce:
I'm only asking so I can say to Mr.EQ "Hey, can you do *insert mod* for me ?" .
Think of the shipping cost, system down time etc.
I've read heaps of threads and info on mods is very vague but from what i've pieced together I think there is:
resistor mod
chip mod
fet mod
cap mod
cutting a resisitor leg removes some kind of protection allowing for more power I think.
fet mod allows more power from the power supply I guess so can run lower loads
and cap mod just helps stability at lower loads but have read that it reduces power very slightly.
dunno what the chip does... prolly more power again at cost of stability lol
This is what i've read and tried to piece together, as I said the info is very vague... point is your better off buying a pre-modded D2
Bodyjar
Dec 8 2002, 03:20 PM
I'm pretty sure the Cap mod gives more power at 4ohm loads?
ripped
Dec 8 2002, 10:14 PM
bassA i understand what you are saying that lower impedance = more current draw... but if you keep the voltage up while playing at low impedances (which is hard to do in street), then you'll have less problems in the amp smoking... plus if you only play a burp or two per run, then it's less likely to blow then when you play 30 sec burps... 30 sec sine waves rather, not really a burp anymore
WeaponX
Dec 9 2002, 09:01 AM
Yeh Jar is right,
the cap mod lets the amp do more power into a higher impedance, the resistor mod does the same..
very hard to "magically" mod an amp to make it do more power, it can only ever put out its rail limit.
Andu
Dec 15 2002, 09:35 PM
stole this off a thread on splenduro:
I had all my D2s modded at the db drag finals. Fady (EQ Tech) changed a couple of small resistors and a resistor bank or module. He would have changed the fuse also, but I all ready had the 40amp fuse in. Total cost in parts, less then 8 bucks, time to do the job, about 5 minutes per amp. He explaind to me that the amps are good to go down to "0" Ohms. You won't get any more power, it's just a safety feature in case the sub blows and shorts out your speaker wires, resulting in a "0" ohm load. Only your 40 amp fuse will blow. Nothing will go wrong with the amp. You can wire the amp for a .5 or .25 ohms for burps only, no daily driving at high volume levels at this impeadance, he said the amp will get very hot, and we all know what heat does to am amplifier. Also, the amp can now put out up to 90 Volts to your subs. A stock D2 at best, puts out only about 65 Volts.
If you want to use this amp for daily driving, with the above mods, use your head, wire it 2 ohms, you'll still be able to blow your ear drums out, and you amp will thank you for it!!.
One other thing, EQ will not do the mods if you send your amp in, they did it for all competiters who were competing during the weekend.
Gary
Weapon: I thought the cap mod was just adding 2 more caps to the 4 in the centre?
the[K]id
Dec 16 2002, 12:31 AM
I'd like to see a before and after bench test of the D2 (real bench test, ie, open it up, and measure voltage on rails and output stage) before I believe it can get 25V more from a mod. As I said before, it's either a BIG mod, or there is something really wrong with a D2 to start with that this mod fixes.
ripped
Dec 16 2002, 12:56 PM
0.25ohms hey... should have gotten a pair of dual 1's, lol...
Andu
Dec 16 2002, 07:22 PM
QUOTE
Originally posted by the[K]id:
I'd like to see a before and after bench test of the D2 (real bench test, ie, open it up, and measure voltage on rails and output stage) before I believe it can get 25V more from a mod. As I said before, it's either a BIG mod, or there is something really wrong with a D2 to start with that this mod fixes.
so would I... 25V up in output voltage is huge lol
QUOTE
Originally posted by rippedskin:
0.25ohms hey... should have gotten a pair of dual 1's, lol...
no! me first
Bodyjar
Dec 17 2002, 10:14 PM
QUOTE
Originally posted by Andu:
Weapon: I thought the cap mod was just adding 2 more caps to the 4 in the centre?
Yeah, thats the mod...
On other news, I put my D2 in today, and am heaps impressed! Only running 4ohm, but absolutely cranks, and I luv the remote gain control for RICE factor
But I did notice it gets quite hot at 4ohm...
Andu
Dec 17 2002, 10:40 PM
Can't wait till mine gets here... hopefully before summernats
NUTTTR
Dec 18 2002, 01:56 AM
bah, thats nothing, i got my ppi today i haven't tried in the car yet tho Gotta wait till thursday when i can run my 2x8ga for positive and 2x8ga for negative into the power terminals..... lol!!! Hmmmm..... sq AND power
How are the d2's for pure sq? any good?
Aaron
ripped
Dec 18 2002, 12:24 PM
richie, i'm running mine at 2ohms and it gets fairly hot when i crank it. how high are your gains? i have mine just off minimum... bah, the remote gain control is a waste of space. doesn't the pioneer have sub control?
Bodyjar
Dec 18 2002, 05:29 PM
I have gains on zero on the amp, and zero on the remote gain control. Yes the pioneer has sub control, but I installed the remote control anyways, I luv it! not that I use it much...
Andu
Dec 18 2002, 09:00 PM
QUOTE
Originally posted by ubugger:
bah, thats nothing, i got my ppi today i haven't tried in the car yet tho Gotta wait till thursday when i can run my 2x8ga for positive and 2x8ga for negative into the power terminals..... lol!!! Hmmmm..... sq AND power
How are the d2's for pure sq? any good?
Aaron
Thats one damn sexy amp you own there.... just animal.
lol your joking about the D2 and SQ aren't u? apparently THD can be up to around 10% at full noise 1ohm
BlackIce
Jan 7 2003, 06:57 PM
Aside from the Bodyjar/Rippedskin smoke mod ( ), anyone ? At all ?
I spoke with the distro.. all he could say was "an amps output is limited by its power rails. I've heard similar rumours of D2's modded to near-D3 power output but thats non-sense." etc etc. hrmmm . I made it quite clear I'd be prepared to pay for such mods, but to no avail.
Bodyjar
Jan 7 2003, 07:03 PM
Yeah, EQ technicians arent allowed to do the D3 mod apparently. It was just done for finals last year or something similar to that...
You can buy mine if you want? hahaha
Andu
Jan 7 2003, 09:02 PM
QUOTE
Originally posted by BlackIce:
Aside from the Bodyjar/Rippedskin smoke mod ( ), anyone ? At all ?
I spoke with the distro.. all he could say was "an amps output is limited by its power rails. I've heard similar rumours of D2's modded to near-D3 power output but thats non-sense." etc etc. hrmmm . I made it quite clear I'd be prepared to pay for such mods, but to no avail.
Well doing some testing on IGN17E's D2 the other day the highest voltage at 2ohm I saw out of it was 70V and highest current out of it was 21A, although not at the same frequency... As a rough indication of the power rail limits the D2 has 100V caps in it.
BlackIce
Jan 8 2003, 11:30 AM
Bodyjar: Will you throw in a can of replacement smoke ?
ripped
Jan 8 2003, 12:53 PM
smoke mods??? lol. bodyjr just got a dodgy one. mine burps at 0.5ohms with no smoke
bodyjar's one burped at 4ohms with smoke
[ January 08, 2003, 10:54: Message edited by: rippedskin ]
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