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Hi Guys
I am currently fitting gsxr600 slabside bike carbs onto my VW Lupo 1.4 - They have been jetted, I have a manifold, fuel pressure regulators and gauge already set up and they are jetted etc. so fitting shouldn't be hard.
Main questions:
- Ignition - will my standard ECU continue to run the ignition or will it go into some kind of limp mode? - I'm not fussed about warning lights, I just don't want it to pink or retard the spark so far I lose power.
- Throttle cable onto standard pedal box - Its not a cable throttle currently, I have sketched out a bracket design that involves me using a bicycle brake cable, drilling a hole in the pedal and having a solid point like a bicycle brake coupled with a second spring on the pedal itself, but I was wondering if anyone else had any great ideas?
Planning to get this done over the next few weeks, its not my daily so I can afford a bit of trial and error, but really keen to get it sorted. |
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mk2cossie
Club Retro Rides Member
Posts: 3,031 
Club RR Member Number: 77
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the biggest issue is going to be to get it to go through a basic emissions test come MoT testing time  The ecu may have a basic look up file for just supplying the ignition but it may be in limp mode and only supply a limited rev range  |
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Your ECU will need to have a signal from a TPS and or the MAF/MAP to determine the load on the engine and adjust the timing accordingly. The easiest way to do this would be to use the tps that you have already and graft that onto the side of the carbs. I think your lupo has a MAF sensor which will also have a temperature sensor in which has an effect on the ignition advance (but if its just unplugged the ECU will disregard this and throw up a check engine light ( which is an MOT fail i think)
To be honest, i would buy a Megajolt and use that. At least you will know what that is going to be doing!
When setting up your throttle cable you'll probably need to move the bit that the cable connects to on the pedal closer to the fulcrum as less cable will need to be pulled through to fully open the throttles compared to the amount of cable needed to fully open the throttle body currently on. A bit of trial and error will be required but you'll get there (i've just been through this with my net itb's on my hillman)
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Too many projects, not enough time.
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Fit a peddle box from a non fly by wire lupo/Arosa? That would probably be more straightforward than trying to convert your peddle box to run a throttle cable.
The way to go with ignition would be to use an aftermarket management like megajolt. Although people have modified that generation of 16v 1.4/1.6 heads to take the dizzy from a mk2 polo and use the ignition set up from that car with it. MikeyMK on here has a build thread for his mk2 on club polo which I think shows how he did it. It's a very basic set up and the ignition curve won't he ideal for the engine, but it will work an people have set them up to give decent enough results.
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Last Edit: Mar 4, 2016 8:24:08 GMT by roccoguy
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Kieran
Posted a lot
Posts: 1,092
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How about using a form of injector emulator like used with LPG conversions
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The Ashby Jackson fleet:-
1979 Mini Clubman 1.8 K series
1978 Skoda 110r Project 130RS K-oupe
1978 Austin Allegro 1500 SDL Estate
1984 BMW K100 Sidecar outfit
1999 Yamaha FZS 1000 Fazer
1991 Kawasaki ZXR400 race bike
2002 Kawasaki ZX9r race bike
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Okay, and does the megajolt use my cars standard crank position sensor etc?
Do I leave my standard ecu in to run the clocks etc?
In regards to the MOT it's going to be getting a fresh one just before I put these on, but they shouldnt be a problem in the future anyway
I do have a couple of dizzys given to ME with the carbs so I'll try and find that thread
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There are lads on cp running bike carbs on mid to late 90's polo's who haven't had issues come mot time. I guess it's all down to how they are set up
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VIP
South East
Posts: 8,293
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...check engine light ( which is an MOT fail i think) Nope, Check Engine lamps aren't tested on the MOT, only ABS, Airbags, or associated warning lights will result in a fail. |
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hario
Part of things
S202 C300STD
Posts: 421
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Like hillmanjames said, if you retain all the OEM ECU sensors by grafting them onto the carburettors (surely you would be doing that anyway?). Then there will be no ignition issues because the ECU will not 'be aware' of your carburettor change..
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*S202 C300TD Wagon*
Installed:
OM606 & 722.6, Evo6 IC, S600AMG callipers & 345mm rotors. No catz. Leatherish seats.. Rust..
Future:
DIY manifolds & turbo compound build.
Built IP, & some kind of software. Less rust..
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froggy
Posted a lot
Posts: 1,099
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You'll need a vac tree to get a smooth vac signal if it uses map Tps and the lambda sensor will throw up codes trying to get it in closed loop . Makes sense to mega jolt it so you can get the best from it
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Last Edit: Mar 8, 2016 12:13:05 GMT by froggy
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I
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Last Edit: Mar 28, 2016 10:29:04 GMT by oscarmax
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Kieran
Posted a lot
Posts: 1,092
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You can, they just don't last due to drowning in petrol!
Lada sold catalyst cars with ozone carburettors.
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The Ashby Jackson fleet:-
1979 Mini Clubman 1.8 K series
1978 Skoda 110r Project 130RS K-oupe
1978 Austin Allegro 1500 SDL Estate
1984 BMW K100 Sidecar outfit
1999 Yamaha FZS 1000 Fazer
1991 Kawasaki ZXR400 race bike
2002 Kawasaki ZX9r race bike
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froggy
Posted a lot
Posts: 1,099
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Suzuki super carry had carb / cat set up which actually worked pretty well as I ran one for a few years as a dog carrier and it went through cat test every year until It rotted beyond saving
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Mar 10, 2016 20:09:37 GMT
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I
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Last Edit: Mar 28, 2016 10:29:46 GMT by oscarmax
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