Mk II Black boxes

P.Lindblom
Posting Freak

821

09-12-2019, 09:10 AM

#1

I have now finished my second, slightly improved batch of black boxes. It still does exactly the same thing as the original TTE black box, but it should be more reliable.

The casings are smaller (60 x 35 x 20mm) which makes them even easier to fit under the ECU lid.
The tantalum capacitor is probably the weakest point of the original Black box from TTE. I've asked around and it seems these are the components that are prone to breaking. For my second batch of black boxes I've used polypropylene capacitors instead.

The price is the same as before though. £70 + £2.50 postage to any country in Europe

[Image: dsc5628fixmeas.jpg]

If you didn't see my first Black box thread, here's the reason why I replaced my HKS FCD with a Black box.

P.Lindblom Not sure if all supercharged IS200s behave the same way with the HKS FCD, but at least some do. When you give your car full throttle at under 3000rpm the engine feels choked and it sometimes judders depending on what setting your FCD is on.

Stav explained it really well a couple of years ago.

Sparkystav The FCD works by taking the input and only sending out a percentage of that figure back out to the ECU. Depending on what number you have it on. (the lower the number the lower the percentage). So you have to make sure the output at full boost is lower than the fuel cut voltage. But obviously your putting less air flow through the range so the ECU sends out less fuel than needed for the actual air amount right through the range. Not enough to cause the engine to go bang obviously but a lower AFR non the less.

The TTE black box on the other hand is pre set. It tops out the figure at the fuel cut (4.34v, on a 0-5v range incidentally) so at that figure it just sends out the same airflow signal to the ECU regardless. But there isnt a lot of range above that with the standard setup so its not too lean.
But heres the difference. Going up the range the TTE box actually sends out a HIGHER airflow to the ECU so it causes the ecu to send MORE fuel out, giving you a better AFR and maybe even some more power.

Hope this helps you understand. While the FCD does the job, its not a perfect replacement for the TTE black box.

And edeath explained it in another thread not so long ago

edeath The black box has a peak level of airflow it allows the ECU to see, wheras the FCD lies by a percentage throughout the rev range.

P.Lindblom
Posting Freak

821

09-12-2019, 09:12 AM

#2

And if anyone is interested, this is how I make them

[Image: dsc5549fix.jpg]

Rabster
Posting Freak

10,234

09-12-2019, 09:35 AM

#3

Very well made Indeed mate

:offtopic:
Are you still flying over for Japfest if so if I emailed over a few schematics could you get them etched for me ? I'll pay of course ?

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P.Lindblom
Posting Freak

821

09-12-2019, 11:03 AM

#4

Rabster Very well made Indeed mate

:offtopic:
Are you still flying over for Japfest if so if I emailed over a few schematics could you get them etched for me ? I'll pay of course ?

Thanks mate Smile

I'll send you a pm about Japfest and possible etching.

Sparkystav
Administrator

14,683

09-12-2019, 02:35 PM

#5

look great mate, love the little test box

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jay_russell
Posting Freak

3,005

09-12-2019, 02:45 PM

#6

is mine a mk 1 or mk2 ?

posty
Senior Member

610

09-12-2019, 05:28 PM

#7

I'm saving my pennies, I am sick of the lag below 3krpm

P.Lindblom
Posting Freak

821

09-12-2019, 07:02 PM

#8

Sparkystav look great mate, love the little test box

Glad you like my Black box calibrator 2000 :tongue_smilie:

jay_russell is mine a mk 1 or mk2 ?

Yours is number 8 of the first batch (Mk I). It works the same way as the new one, but it has exactly the same components as the original TTE black box. If it breaks in the future I'll repair/replace it for you.

Marsdendean I no doubt will have one when i get a charger again, looks like a far bit of money for £70!

posty I'm saving my pennies, I am sick of the lag below 3krpm

I'll have BBs ready for you when you want them Smile

S
Banned

1,153

11-12-2019, 07:19 PM

#9

ill be having one of these soon hopefully!

Jon
Member

189

11-12-2019, 07:33 PM

#10

Stix44 ill be having one of these soon hopefully!

Ive just paid for one, hopefully be here some time this week!

Hope its better than the HKS FCD

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