20 replies to this topic

[timmy850]

Locking up the advance weights is super easy. There’s also no reason why you couldn’t cut the tie wires and go back to mechanical advance if you are gentle with the springs

I’ve got the Accuspark blackbox 1 and it’s got similar features in regards to timing curve’s & rev limiters

[lsto]

I run an accuspark stealth black box 2. It's a unit you wire in between the coil and dizzy and you can set your own advance curves with it, and it can hold 3 maps, also you can adjust it on the unit, no computer required. I've had it for nearly 2 years now, no problems. You can adjust it to your hearts content.
If you google it they have some videos on YouTube, you keep your standard dizzy and go from there. Good luck.

Hi Isto,

There's actually a deal on at the minute and they're £170
For the stealth 3. Doesn't seem bad value for money. How did you find the 3 maps already installed?
I coincidentally watched some of those videos tonight. Once thing I wasn't sure of is actually making your own "nap" as such.

Is it just a case of stating what advance you require at set rev ranges? Can you also still run your vac advance?

Cheers,

When I purchased my black box 2 you could buy it either with or without vac advance in the module. Because I am running a boosted engine I chose the non-vac version because I didn't know if boost pressure would damage the unit. That said I still have the vacuum advance connected on the distributor so although I have locked the centrifugal advance with the locking wire supplied, it still has vacuum advance for if I'm cruising at part throttle.
I didn't try the pre installed maps again because I already knew what advance I wanted to run, on one of AC Dodds live chats we spoke about engine spec and he kindly gave me a rough advance curve to try, but it's really easy to adjust. When I was dialling it in it was literally a case of drive down the road, pull over, add or minus some timing at X rpm, drive again till I got a nice aggressive curve without pinking etc.

Edited by lsto, 22 April 2025 - 05:28 PM.

[Spider]

I did try a Black Stealth some time ago. They are quite good for what they are, but on some distributors, in particular the 45D and 54D series, there can be an issue that's easy to overlook - the rotor button.

Because the mechanical advance is locked out, the rotor button doesn't advance to line up with the contact in the cap. If you only need small advance numbers, this usually isn't an issue, but if you have around 20 degrees* total distributor advance (mechanical and vacuum) or more, there can become quite a gap that can result in misfire and short cap and button life. * I did work out what the maximum angle was but off hand, I can't recall it now.

These systems don't actually provide any advance - they can't predict the future ! But how they do work is by providing retard and lower speeds, reducing as the rpms increase in line with what ever curve you've dialed in on the software.

 

Ideally, when locking up the mechanism, it needs to be filed back so it's retarded rather than just at zero or modify the backing plate to compensate.

[timmy850]

I’ve not had any misfire problems with mine.

I set mine up to idle at 10 degrees using the distributor, then started the advance curve from there and added another 20 degrees using the black box

The manual said to have it idling at zero degrees and then add your total 30 degrees. I feel like this has a higher chance of rotor phasing problems & also if you ever had a problem and needed to bypass the unit having 10 degrees is better than zero if you need to limp it somewhere safe

You can get extended tip rotors which can reduce the chance of missing a spark

[babsbrown]

Thanks chaps

A real insight reading all of this. I've contacted minispares and their evo dizzy is back I stock next week. I'm half tempted to Tey this first as it's meant to be matched to their evo001 cam I have in the engine. It almost seems daft not to given the price point. Failing that I'll try the csi.

Cheers again

[Steam]

You don't need an all singing, all dancing overly technical system, you need a dissy that suits your engine so your last post is spot on. The matched unit is the best option for you.