Dastek Unichip...
Discussion
A search reveals minimal talk about these piggyback chips which surprised me. A friend's E30 M3 has one, mapped by Circuit motors (next to castle combe).
I can't disagree with the output (250hp from a 2.3 215hp motor though it does have cams, carbon airbox, exhaust, different pistons) for which you can see a dyno chart here http://www.vr6oc.com/e107_files/public/1225642170_... . I drove the car and it was linear and progressive. Tiny bit stumbly from cold though. However it stank like a racing car when you followed and it was floored, and the owner said fuel consumption was horrific.
Can I put one on my Merc? It has jetronic. I would say ignition would/should not be mapped because it uses a different computer to the injection - do I lose out on that? But the injection has a method of varying fuel control pressure by supplying a current to an electronic actuator so can unichip deal with this? The car does have an air flow sensor... mostly. My fuel consumption is quite good at 28mpg always and I'd rather not lose it. Do they map part throttle as well as full?
I can't disagree with the output (250hp from a 2.3 215hp motor though it does have cams, carbon airbox, exhaust, different pistons) for which you can see a dyno chart here http://www.vr6oc.com/e107_files/public/1225642170_... . I drove the car and it was linear and progressive. Tiny bit stumbly from cold though. However it stank like a racing car when you followed and it was floored, and the owner said fuel consumption was horrific.
Can I put one on my Merc? It has jetronic. I would say ignition would/should not be mapped because it uses a different computer to the injection - do I lose out on that? But the injection has a method of varying fuel control pressure by supplying a current to an electronic actuator so can unichip deal with this? The car does have an air flow sensor... mostly. My fuel consumption is quite good at 28mpg always and I'd rather not lose it. Do they map part throttle as well as full?
Vixpy you didn't even need to post for me to already know what you thought! 
.
Tell me what's wrong with a piggyback on an old basic ECU if mapped well? Compared to the cost, effort and returns of going to aftermarket EFI (which would cost more than my car) it seems sensible from this inexperienced-but-willing mind. The factory map is close to correct, so Unichip can just slightly tweak as necessary (perhaps to take account for modifications) - can't it be trusted to do this basic task?
The guy did spend 3 days mapping this M3 - does that mean it was a b
h to get right or that it's been well done!?
Any comments on that curve there?
.Tell me what's wrong with a piggyback on an old basic ECU if mapped well? Compared to the cost, effort and returns of going to aftermarket EFI (which would cost more than my car) it seems sensible from this inexperienced-but-willing mind. The factory map is close to correct, so Unichip can just slightly tweak as necessary (perhaps to take account for modifications) - can't it be trusted to do this basic task?
The guy did spend 3 days mapping this M3 - does that mean it was a b
h to get right or that it's been well done!?Any comments on that curve there?
agent006 said:
Pentoman said:
Tiny bit stumbly from cold though. However it stank like a racing car when you followed and it was floored, and the owner said fuel consumption was horrific.
My 325 runs a Unichip mapped by Circuit Motors too, with exactly the same symptoms. Nice power and drive but drinks fuel and smells like a B plate fiesta.Did it give a power and torque gain? Do you have figures or a graph?
If it helps anyone my 2.5 Merc does 28mpg all the time so Alec I'd hope your 325 could get close.
Oohh.. interesting.
Did it give a power and torque gain? Do you have figures or a graph? Warren who now owns the M3 has been planning on bringing it back to me, but I hav not seen it as yet. He's too busy cleaning it and taking photos.....
sorry just enjoying the m3 porn. He said he's going to bring it in as he wasn't sure it was 100%.
The 220bhp at the wheels - what gear's that in? Excuse the curiosity I've been reading Circuit Driver back issues while between jobs...
ShepsM3 said:
Pentoman said:
agent006 said:
Pentoman said:
Tiny bit stumbly from cold though. However it stank like a racing car when you followed and it was floored, and the owner said fuel consumption was horrific.
My 325 runs a Unichip mapped by Circuit Motors too, with exactly the same symptoms. Nice power and drive but drinks fuel and smells like a B plate fiesta.Did it give a power and torque gain? Do you have figures or a graph?
sorry just enjoying the m3 porn. He said he's going to bring it in as he wasn't sure it was 100%.
The 220bhp at the wheels - what gear's that in? Excuse the curiosity I've been reading Circuit Driver back issues while between jobs...
said:
The Merc 190 Cosworth is indeed mechanical injection. I wouldnt bother fitting a Unichip to that because of it.
Why?Edited by Pentoman on Thursday 13th November 16:56
Edited by Pentoman on Thursday 13th November 16:57
Good fun... its rare to find a dyno runner that doesn't criticize other dyno runners (this isn't me being mean, just a nature of the fact they are difficult to run I suppose).
The day was a vr6 o/c day so approx 15 VR6 Golfs ran - all made figures which seemed near to stock figures so I thought it was a relatively confident indicator. For me, I went to powerstation 2 years ago so was keen to go there again since I rebuilt the top end a year ago.
Back to my Merc... - the ignition does indeed have a computer. As for the fuel - yes injection is mechanical (a flap is moved by intake airflow, this flap is connected to a lever which when moved lets more fuel to the injectors). However it's KE Jetronic so there's an (electromagnetic) actuator which, when current is applied by the ECU, varies the fuel control pressure that the flap works against. Ergo it leans/richens the mixture. It will do closed loop but not on my pre-cat car.
The day was a vr6 o/c day so approx 15 VR6 Golfs ran - all made figures which seemed near to stock figures so I thought it was a relatively confident indicator. For me, I went to powerstation 2 years ago so was keen to go there again since I rebuilt the top end a year ago.
Back to my Merc... - the ignition does indeed have a computer. As for the fuel - yes injection is mechanical (a flap is moved by intake airflow, this flap is connected to a lever which when moved lets more fuel to the injectors). However it's KE Jetronic so there's an (electromagnetic) actuator which, when current is applied by the ECU, varies the fuel control pressure that the flap works against. Ergo it leans/richens the mixture. It will do closed loop but not on my pre-cat car.
Pumaracing said:
The VR6, at least the 2.9 engine, is not the ideal choice on which to conclude a dyno is accurate. The 2.8 certainly puts out close to its claimed
Probably something daft like 120 at the wheels and supposedly 180 or more at the flywheel.
Precisely right!Probably something daft like 120 at the wheels and supposedly 180 or more at the flywheel.
They all had aftermarket intakes and exhausts, so 180 may or may not be right ish. I did ask the operator, a nice bloke he is too, about the low @wheels figure, because the PH missive said the same thing when I posted my dyno sheet of 2 years ago. Can't remember what he said now but did say in a different gear you'd get different @wheels figure and then different run-down losses but it works out at the same estimate figure.
I rate how powerstation send out pdfs of the dyno results after their dyno days; a nice touch and it seems they're putting themselves out there for criticism too, bravely!
Anyway, anyone want to run my car showing lambda please?
Edited by Pentoman on Wednesday 19th November 15:02
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