Chipwizards

12/10/2026

I've been developing a MAP/TPS conversion setup for older Bosch systems that originally have a 'vane' type Air Flow Meter and two throttle switches (one for idle and the other for full throttle).

I've converted one of the old throttle switch inputs into a 5V reference output and the other switch input to a 0-5V TPS input. This means that throttle movement is now used for acceleration enrichment and activates from any throttle position. Idle position and full throttle position are now set in software.

It uses the AFM supply, ground and signal wires for the same functions in the MAP sensor, with a separate Air Temperature Sensor.

I'm also going to use the 'barometric' input channel for the idle mixture adjustment. I haven't actually DONE it yet but I know what I need to do in order to do it. The original AFM has an air bypass channel for mixture adjustment, which increases or reduces the 'load' value slightly to change the mixture. Since it's not possible to do that with a MAP sensor (not without some nasty air bleed or something) I'm doing it with an analogue input that I can reconfigure to make a small injector duty adjustment using a potentiometer under the left front seat by the ECU.

I'm going to expand the maps too, for better resolution, and I've already made the idle and full throttle maps into tables. They are normally just a 2D 'line' referenced to RPM, but making the idle map into a 3D table with a load axis will give better speed control and mixture stability with changes in load; and making the full throttle 2D line into a 3D table will allow for boosted applications, should somebody want to do that.

29/09/2026

Buyers and Sellers beware.

This is my GT2, some of you will have seen this if you've been to my place. Registration number GT08TOO, VIN WP0ZZZ99Z8S794536.

I was having some minor work done to it by someone called Jack prior to an arranged sale to The Octane Collection. They had acknowledged that they were going to pay me for the car, but Jack somehow managed to convince them to pay him for it when he didn't have permission to sell it.
They bought it without ANY documents or evidence that Jack had any authority to sell it. Under British law 'nemo quod non habet' applies, which means that for legal title to pass, the seller has to have the permission to sell, so the car is still legally mine.

I don't believe that The Octane Collection have done anything unlawful, but they have been extremely foolish buying a car without documents from someone who they barely knew, especially a car of this value.

If anyone is interested in buying it from The Octane Collection you must understand that the car is still legally mine, and a month, a year or ten years down the line, regardless who the current 'keeper' is, a bailiff or the police could take the car from you to return it to its legal owner.

I have written evidence to support my claim so this is not in any way defamatory or slanderous.

Please share.

24/03/2026

Juicy

12/12/2025

It was a pleasure to be involved with Taylor Made's supercharged 540i touring.

Luck landed nicely in my lap a little bit because I was involved with a Life Racing ECU conversion on a 993 GT2 at the same time, which meant that there was a MAF going spare that just happened to be perfect for the 540. Those things are rarer than hen's dentures so it was super lucky. :-)

In this episode I modify my 1 of 1 supercharged BMW 540i Manual touring but unfortunately it goes completely wrong…Find James here: https://www.bmwtuning.inf...

10/11/2025

You don't see these every day.
MGB GT V8.

16/10/2025

I haven't posted anything in a while but I thought someone might find a few videos interesting.
This is a Supercharged 540i 4.4 that I've been asked to do for a YouTuber 'Taylor Made'.
With any job like this you need to make sure you have the basics covered, the 'foundations' if you will. I fitted the emulator so I can see exactly what is going on inside the ECU, and made some rudametary changes to enable some safe dyno pulls. It turned out that the fuel flow to the rail was more than adequate, but the MAF and the injection duty cycle were both maxing out before the top end.

19/04/2025

Well done team J-Mec on yesterday's pole and class lead after today's part of the Spa 12h. Good luck for tomorrow boys and girls.

05/10/2024

Congratulations to Mark Sumpter , Marino Franchitti and Kyle Tilley for their GT2 class 1st and 2nd places at Estoril this evening.

After a long time resting, the Blue Coral GT2 still has it.

https://www.instagram.com/reel/DAsqAl8NeOV/?utm_source=ig_web_button_share_sheet

17/01/2023

Just thought I'd share a little video of what effect inlet flows resonance has on MAF readings. There's a gentle change in load initially, to show what should happen normally as the mass flow increases and decreases, then at around 12-14 seconds enough throttle is applied to cause resonance.

28/12/2022

I thought somebody might find this interesting. The top trace is the primary injector, and you can see that the duty cycle reduces as the revs rise and more duty is applied to the secondary injector, which is the lower trace.
These are actually primary and secondary from different cylinders, hence the offset in the flyback voltage, but the timing of the secondary injectors is usually not critical anyway, with so much port being 'wet'.