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| anyone tried single point? https://www.ausmini.com/forums/viewtopic.php?f=2&t=66233 |
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| Author: | woodwormm [ Sun Oct 10, 2010 2:06 pm ] |
| Post subject: | anyone tried single point? |
was browsing and dreaming about efi and i remembered that in the changeover from carbs to efi in mass production, there was a time when lots of small cars had single point injection... has anyone replaced their carbies with this set up? i'm just dreaming now, i think when i go efi it'll be in conjuction with an sc12 or a xflow head.... but that's probably a good lotto ticket away. |
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| Author: | Kennomini [ Sun Oct 10, 2010 4:07 pm ] |
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I'm pretty sure most mini's with fuel injection have the SPI instead of the MPI as MPI only came out for a few years. I'd assume SPI is slightly better for fuel consumption than a carby and MPI will only be a little better than SPI  I think the main benefit is the "green effect" slightly less emissions for no real power gain. (Correct me if I'm wrong.)
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| Author: | drmini in aust [ Sun Oct 10, 2010 6:13 pm ] |
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Main benefit of SPI was better emissions and fuel economy, for a HP LOSS. Hence why folks in the UK bin the injection and retrofit a carby or 2. |
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| Author: | Harley [ Sun Oct 10, 2010 6:18 pm ] |
| Post subject: | |
SPIs aren't that crash hot for fuel consumption anyway, they still average about 8-9 L/100km. |
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| Author: | Lillee [ Sun Oct 10, 2010 6:28 pm ] |
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The only time SPI should be considered is in an intercooled turbo configuration 
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| Author: | pristic [ Mon Oct 11, 2010 8:13 am ] |
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Lillee wrote: The only time SPI should be considered is in an intercooled turbo configuration
The only time SPI should be considered is in an 8-port intercooled turbo configuration
Wouldn't do it on an N/A nor on a siamese port personally. Pete |
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| Author: | drmini in aust [ Mon Oct 11, 2010 6:26 pm ] |
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pristic wrote: Lillee wrote: The only time SPI should be considered is in an intercooled turbo configuration The only time SPI should be considered is in an 8-port intercooled turbo configuration Wouldn't do it on an N/A nor on a siamese port personally. Pete Maybe I'm dumb or old (yes to the latter) but why would you bother to use SPI on an 8 (or 7) port head when you have 4 nice separate inlet ports?? 
Surely MPI is the way to go then. |
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| Author: | EST-071 [ Mon Oct 11, 2010 7:03 pm ] |
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Harley wrote: SPIs aren't that crash hot for fuel consumption anyway, they still average about 8-9 L/100km.
I don't know about that, I get 41 mpg driving around Sydney out of mine. And no I am not driving Miss Daisy. 
Cheers Pete |
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| Author: | blue_deluxe [ Mon Oct 11, 2010 10:45 pm ] |
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drmini in aust wrote: pristic wrote: Lillee wrote: The only time SPI should be considered is in an intercooled turbo configuration The only time SPI should be considered is in an 8-port intercooled turbo configuration Wouldn't do it on an N/A nor on a siamese port personally. Pete Maybe I'm dumb or old (yes to the latter) but why would you bother to use SPI on an 8 (or 7) port head when you have 4 nice separate inlet ports?? Surely MPI is the way to go then. I always figured with mpi (or individual throttle bodies to be precise) are for n/a only as its wasted effort to direct air more smoothly when its being forced through at 10-15psi. Its easier just to chuck a single big throttle body and let everything be pressurised. Nowadays the usual way is to have a single throttle body leading into one injector per cylinder. |
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| Author: | pristic [ Tue Oct 12, 2010 7:52 am ] |
| Post subject: | |
drmini in aust wrote: pristic wrote: Lillee wrote: The only time SPI should be considered is in an intercooled turbo configuration The only time SPI should be considered is in an 8-port intercooled turbo configuration Wouldn't do it on an N/A nor on a siamese port personally. Pete Maybe I'm dumb or old (yes to the latter) but why would you bother to use SPI on an 8 (or 7) port head when you have 4 nice separate inlet ports?? Surely MPI is the way to go then. True - my point was I wouldnt INJECT a siamese port period... N/A or Turbo... but 7/8 port... absolutely. SPI, MPI, whatever setup but point being about 5 porters... thats all. If I had the $$ I would get an 8 port and inject it, would look into all injection options and then work out what works best (and fits lol) Pete |
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