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Oct 15, 2007 17:44:49 GMT
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I picked up an MG Montego Turbo SU carb for my project. Foolishly I thought it would just be a case of swapping over the carbs and associated plumbing. No such luck, as Austin Rover saw fit to combine the carb with an ECU. From what I can gather, this controls a stepper motor for cold starting and acceleration enrichment. So... do I need to get hold of one of these mystical black boxes, or is there a way to get around it? Will it run alright without the ECU? What do the Mini Turbo people do? Any advice / links would be spiffing. Cheers
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Oct 15, 2007 18:29:34 GMT
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dean mate , check out the currant ppc. theres a good article about them turboing the roller using su,s. very clever stuff.
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"quote hairnet"
I'm not paying nine pound for a pi$$!
[/quote]
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Oct 15, 2007 18:33:49 GMT
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I think you can use the main body or bits of, from a non-electronic SU. I have an hif44 from a meastro that has electronic choke, looks like it unbolts and then you transfer the ordinary choke aparatus over. the motor is choke only I believe, as the enrichment is vacuum as with normal practice on SU's. I maybe wrong of course, someone else confirm/deny?
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Oct 15, 2007 19:37:03 GMT
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Thanks for that, I haven't bought my copy of PPC yet so I'll have a look.
The carb I have is just a sealed HIF44, so I dare say that a choke off of another HIF44 would fit, but it's the acceleration enrichment that concerns me - I'm not sure that the vacuum system would work on a turbocharged set-up, so they used an electronic stepper motor controlled by an ECU that senses engine speed and throttle position to lob more fuel in.
I might be wrong though. I can live without a choke, but I don't want a flat spot whenever I plant the throttle! ;D
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slater
Club Retro Rides Member
Posts: 6,390
Club RR Member Number: 78
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Oct 15, 2007 20:50:19 GMT
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I don't relly know what the differance between the montego and the metro carbs are but it cant be alot. What your basicly saying is they are using the choke to add extra fuel on boost? I doubt that slightly but it is BL so who knows!
The throttle enrichment will still work. On a SU its basicly the damper on your dashpot that acts like an accel pump and keeps the mixture rich as you boot it. It takes into account the boost pressure.
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Oct 15, 2007 21:01:55 GMT
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I don't relly know what the differance between the montego and the metro carbs are but it cant be alot. What your basicly saying is they are using the choke to add extra fuel on boost? I doubt that slightly but it is BL so who knows! The throttle enrichment will still work. On a SU its basicly the damper on your dashpot that acts like an accel pump and keeps the mixture rich as you boot it. It takes into account the boost pressure. Ah, thanks Slater. I was going off the Haynes manual which says that this particular carb has "variable choke with mixture control" which I could have misread as having something to do with acceleration as well as cold starting. A lot of people use these carbs and I'm sure they're not all using the black boxes as well... maybe it is just for the choke, in which case I could switch it for something else... I think the best thing to do is plough ahead without the ECU. I don't mind electronics being in my car, but BL electronics? I'd have to be desparate! ;D ;D
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I removed it from mine, ran without it!
Boost enrichment was fine, and the choke stuff from the metro one fits on (i think the shaft is a different length, i used a rebuild kit for the metro turbo one)
J
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Oct 16, 2007 15:14:36 GMT
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That's good news! Lucas electronics? No thanks! ;D I'll look out for a manual choke and use that... or just suffer the winter with no choke. It's what I'm doing at the moment! ;D
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