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Discussion Starter #1
The traditional option from Radium Automotive now (?) has competition:
T4 ECU connector part numbers included.

---Radium:
ECU header: $59.95 (17-0009)
T4 ECU Header for 04-05 Lotus

Connector: $99.95 (17-0010)
includes all pins and backshell, but no rubber wire seal grommets
T4 ECU Connectors & Pins for 04-05 Lotus

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---Tyco Electronics (via Mouser, but others sell this too):
ECU header: $33.07 (8-1393476-0, but not in stock yet)
https://www.mouser.com/ProductDetail/TE-Connectivity/8-1393476-0?qs=fBk%2bzusEudjbYZt21%2bem0A==

Connector:
52 pin connector: $8.77 (1393450-5)
https://www.mouser.com/ProductDetail/TE-Connectivity-AMP/1393450-5?qs=/ha2pyFadugQHljWEMOX9awSY3ES84UZvZbF5AG1CiU=

28 pin connector: $5.39 (1393436-4)
https://www.mouser.com/ProductDetail/TE-Connectivity/1393436-4?qs=/ha2pyFaduiQLG7dLy8luCKiEHmQMeW9cAPTEb18bk8=

small back shell: $1.37 (1393454-5)
https://www.mouser.com/ProductDetail/?qs=EVI5SOJzNydlFcnCyLSgVA==

large back shell: $2.09 (1393454-9)
https://www.mouser.com/ProductDetail/?qs=EVI5SOJzNyeglazldSdUxg==

76 wire grommets: $0.23x76 = $14.21 (963530-1)
https://www.mouser.com/ProductDetail/?qs=vYRnAgBhxgT/9FnxMr9w0Q==

76 pins: $0.75x76 = $48.49 (2-1411573-1)
https://www.mouser.com/ProductDetail/?qs=u4fy/sgLU9P0rKodQl0ryA==
I think this part is too expensive, so I'm trying something else that is close...

4 wire grommets: $0.30x4 = $1.3 (1393457-4)
https://www.mouser.com/ProductDetail/?qs=7I5KAOYEosyh0BiPYE5qsg==

4 wide pins: $0.43x4 = $1.72 (1411594-1)
https://www.mouser.com/ProductDetail/?qs=eqe8eff%2bweQEANc5TUluxg==

Total for connector: $83.34
 

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2007 Lotus Exige S
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Thanks for posting this up. Any idea if those pins will fit the '06+ ECU for those that have to replace one and don't want to replace the whole connector?
 

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2005 Elise LSS Saffron Yellow
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Very interesting. Great job tracking down the Tyco parts. BTW, I'm about to pull the trigger on a VAG COM cable and join you in the wonderful world of poking at T4 ECUs...
 

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Discussion Starter #4
Very interesting. Great job tracking down the Tyco parts. BTW, I'm about to pull the trigger on a VAG COM cable and join you in the wonderful world of poking at T4 ECUs...
This is exciting. If the one you get fails to have the FTDI microchip in it, post pictures of the wiring and microchip and I'll see if there's a java API that I could adapt to my code..

I am also excited to finally find a source for ECU connectors, but disappointed that the ECU side is not cheaply available.

I intend to make a splice connector that allows me to attach to/repurpose ECU pins without modifying my cars wiring harness - the ECU has a bunch of unused pins, including two 0-5V analog inputs (pins 50 and 32, out of the 16 total AtoD pins) that are brought out of the PCB. I'd like to start with an intake pressure/temp sensor (TMAP) and a UEGO (innovate has 0-5V analog output). Then I can compare the car's current behavior (calc'd intake vacuum, fuel trims) to the sensor behavior and maybe even switch to updated sensor driven operation.
 

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2005 Elise LSS Saffron Yellow
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What you are building is called a 'breakout box' and is a standard diagnostic gizmo anywhere you have a black box component with a fat connector on it and you want to know what it is seeing and what it is doing without abusing the wiring harness.

See also:
https://www.diyautotune.com/support/tech/hardware/diybob/

I'd expect that measured values are going to be available for a lot of these things through OBD - maybe not at the time resolution you want, but there. It will be interesting to see how calculated MAP agrees with your measured MAP, though.

I would expect that the only time a WB EGO is going to tell you much is going to be cold starts, transitions, and open loop operation at high RPM. That said, if we ever get to the tuning stage, it's extremely useful - indeed nobody with any sense tunes without one anymore.

Most WB EGO boxes can, incidentally, be told to create a 0-1 V output with any desired relationship to the measured mixture for lying to the ECU as a doctored EGO input. this can be quite handy as well for exploring alternate operating regimes or just to save you needing to put a second bung in your exhaust plumbing. Do be careful of peak temperature limitations on the WB EGO sensor, though - they're generally lower than the standard EGOs have.
 

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Discussion Starter #6
T4e connector guess

Thanks for posting this up. Any idea if those pins will fit the '06+ ECU for those that have to replace one and don't want to replace the whole connector?
Here's my best guess for the connector for the T4e. Be aware that I have not actually seen a T4e ECU in person, so this could be way off.

This one is a molex part:

https://www.molex.com/molex/products/datasheet.jsp?part=active/0366380003_PCB_HEADERS.xml


Header: 2x Molex (36638-0003) $9.12 ea.
https://www.mouser.com/ProductDetail/Molex/36638-0003?qs=sGAEpiMZZMs7eK6h2EBtKn3iiSKfEiGr63PO2GAs39o=


connectors:
Molex (64320-1311) $12.20
https://www.mouser.com/ProductDetail/?qs=WeK9NnMzqvcXVNoZVfEo8A==

Molex (64320-1319) $12.20
https://www.mouser.com/ProductDetail/?qs=WeK9NnMzqvc5OyjiVEjwQw==

pins: (64322-1039) $0.142 ea. (need 80, buy 100 to get discount price).
https://www.mouser.com/ProductDetail/Molex/64322-1039-Cut-Strip?qs=sGAEpiMZZMsE7cRVS4xF2NXwZKt8xdft

larger pins: (64323-1029) $0.33 ea. (need 16)
https://www.mouser.com/ProductDetail/Molex/64323-1029-Loose-Piece?qs=sGAEpiMZZMurOll/asxKYcBbXr5xwoVNbpJTDheOOnk=

As a word of caution, I see that radium advises that their pins are not compatible with the Lotus OE connector, so I think these may also not work. You'd have to give it a try yourself (or rebuild the connector side you're interested in). Also, others beside Mouser sell these parts.

The attached data sheets list other part numbers for the pins too, as does the first link.
 

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Discussion Starter #7
\I would expect that the only time a WB EGO is going to tell you much is going to be cold starts, transitions, and open loop operation at high RPM. That said, if we ever get to the tuning stage, it's extremely useful - indeed nobody with any sense tunes without one anymore.
if all works intuitively, I'd like to rewrite the ECU control to work on the UEGO for closed loop fueling (not on the UEGO's simulated HEGO output). This, I expect, would give a more ideal control signal. The only place (apart from OBD) that the ECU uses the front O2 sensor is in the STFT algorithm. For now this is a pipe dream.. but there's no point giving up without trying. I figure its safer to try watching the two sensors side by side before and after switching which one controls the car.
 

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2005 Elise LSS Saffron Yellow
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Well, you've already sussed out that the STFT's purpose has to do with emissions control (specifically for reducing NO to N2 - you need CO for this, which would normally be oxidized to CO2 by the oxidizing catalyst bed - alternating between lean and rich mixtures allows both halves of the catalyst to work).

If you don't live in a place with frequent thermal inversions (like Southern California) or a few other urban centers with NOx issues, then we can just pitch this and get exactly the tuning we want. If there's an unused pin we can pull low/high with a switch, we can enable/disable a performance tune on the fly.

If you're running with a WB EGO and ignoring the cat, you can do things like the original Honda Insight did and go into lean cruise for best fuel economy (and better knock resistance, because lean mixtures burn slower). So you'd have something like the optimized tune (performed by the flight engineer) used on WWII bombers - best power mixture (rich) at high power settings, reverting to best economy (lean) at cruise. This has the benefit of reducing mixture knock sensitivity, so you can run more ignition advance, ditch EGR, or both (although EGR should help with cylinder filling at very low BMEP like level cruise at 60 MPH in 6th gear). Lean cruise also removes carbon deposits from the combustion chamber and exhaust tract, resulting in more consistent engine behavior over its life.
 

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There are two different T4e headers.

Molex 36638-0002 (black tabs) and 36638-0003 (brown tabs), as mentioned above. -0002 is on the left and -0003 is on the right. This matches the T4e ECU orientation, as well. The pin dimensions and layout are the same, but the key features are different.

 

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There are two different T4e headers.

Molex 36638-0002 (black tabs) and 36638-0003 (brown tabs), as mentioned above. -0002 is on the left and -0003 is on the right. This matches the T4e ECU orientation, as well. The pin dimensions and layout are the same, but the key features are different.
I'm looking to wire up a standard EMU Black instead of the PnP because I plan to do a K-swap later. Are you saying these are keyed differently from each other and will connect to the factory harness?

Thanks,
Kevin
 

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I'm looking to wire up a standard EMU Black instead of the PnP because I plan to do a K-swap later. Are you saying these are keyed differently from each other and will connect to the factory harness?

Thanks,
Kevin
Yes - you need one of each header connectors shown, P/Ns ending in -0002 and -0003. Those are the header connectors I used to make a jumper harness between a Haltech and the stock engine harness/chassis harness.

 

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Yes - you need one of each header connectors shown, P/Ns ending in -0002 and -0003. Those are the header connectors I used to make a jumper harness between a Haltech and the stock engine harness/chassis harness.
Great!

Thanks,
Kevin
 
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