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| Widening Spi Throttle Body https://www.ausmini.com/forums/viewtopic.php?f=2&t=87864 |
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| Author: | BRGmini [ Wed Nov 26, 2014 9:25 pm ] |
| Post subject: | Widening Spi Throttle Body |
So i have been doing a little research on the topic of increaseing the diameter of the Rover Mini SPI throttle body. I have concluded that it is possible and that its quite a comman modification in Japan, they uprated the standard 41mm throttle body to 45mm.   My question is has anyone here attempted it and if so was there a noticably diffrence in power ? |
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| Author: | Harley [ Wed Nov 26, 2014 10:22 pm ] |
| Post subject: | Re: Widening Spi Throttle Body |
This is the first i've heard of a bigger throttle body on an spi (though i do have an spi manifold thats been ported out to flow better)......its done on mpi's cause its easy and serves a benefit but on the spi's the throttle body isn't the power restrictor. Realistically, the most power you would get from that modification alone would be about 1 hp, if you've already got extractors and exhaust, ported head, sports air filter and raised compression, then maybe it could work. |
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| Author: | timmy201 [ Thu Nov 27, 2014 6:44 am ] |
| Post subject: | Re: Widening Spi Throttle Body |
Specialised Components make an upgraded throttle body kit. It's one of the few places that do parts for spi engines http://www.twinkam.co.uk/shop/article_S ... 218.001%26 |
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| Author: | KLAS [ Thu Nov 27, 2014 6:56 am ] |
| Post subject: | Re: Widening Spi Throttle Body |
i offer this modification since years. not worth any HP if your engine is unter 85 - 90 HP. remember this TB was original fitted to Rover K series engines with up to 95HP before it found its way to the A series |
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