ORB 227 1 Cars Posted August 1, 2007 Is the twin barrel throttle body off a 405 SRi the same as the one off an MI16? They look the same, but I actually have not put them next to each other to compare? Share this post Link to post Share on other sites
ORB 227 1 Cars Posted August 1, 2007 Hmm, just went to bolt on the body to the manifold and it seemed to be the correct size. After looking at it, I notice its a weber? Any thoughts if this will be ok? Share this post Link to post Share on other sites
Baz 421 Posted August 1, 2007 It will fit, but just check the throttle butterflies are the same size, iirc the SRi ones are smaller, therefore not ideal, although it will work. Share this post Link to post Share on other sites
jackherer 543 Posted August 1, 2007 It will fit, but just check the throttle butterflies are the same size, iirc the SRi ones are smaller, therefore not ideal, although it will work. The SRi TB definitely has smaller butterflies. Share this post Link to post Share on other sites
ORB 227 1 Cars Posted August 1, 2007 What kind of power diff will there be over the standard MI16 item? Here are some pics i took a few mins ago, not that they help, its just I am not actually sure what car i took this from, I just assumed it was from an SRI engine I had? Share this post Link to post Share on other sites
taylorspug 7 Posted August 1, 2007 Looks like an MI tb to me... Share this post Link to post Share on other sites
welshpug 1,677 Posted August 1, 2007 definitely looks like a throttle switch rather than potentiometer... Share this post Link to post Share on other sites
ORB 227 1 Cars Posted August 1, 2007 Call me stupid (although, i would rather you did'nt ) Whats that mean them Mr Welshpug? Share this post Link to post Share on other sites
welshpug 1,677 Posted August 1, 2007 oh, the Mi16 uses a switch rather than a throttle potentiometer (i.e on/off rather than a variable resistance), the SRi uses MP3.1 which is a map sensor and coilpack equipped management and uses a pot not switch. but thats just me waffling on! measure both butterflies and post up your findings, someone willbe able to confirm what sies they should be. Share this post Link to post Share on other sites
pug_ham 245 3 Cars Posted August 1, 2007 The butterflies are definately smaller, I've measured them before & iirc there is at least 1mm difference between the Mi & SRi butteflies. oh, the Mi16 uses a switch rather than a throttle potentiometer (i.e on/off rather than a variable resistance), the SRi uses MP3.1 which is a map sensor and coilpack equipped management and uses a pot not switch. That is a switch just like those fitted to the 205 8v & the Mi16 but not all 405 SRi's have MP3.1 fitted, some have L3.1 jetronic (D6A engine code, MP3.1 is D6D). Graham. Share this post Link to post Share on other sites
Baz 421 Posted August 2, 2007 (edited) The pic posted above *looks* like an Mi one as the SRi ones do, but it looks like it's the smaller type, you can see the step down where the bore gets smaller just before the butterflies, the Mi one is barely noticable. Edited August 2, 2007 by BazGTMi Share this post Link to post Share on other sites
KRISKARRERA 2 1 Cars Posted August 2, 2007 I reckon that's the 8 valve's TB too. Share this post Link to post Share on other sites
Sandy 191 Posted August 2, 2007 Simple to spot difference, the SRi opens one throttle first then the second catches up when the first's mostly open, like a two stage carb. The Mi16 opens both at virtually the same time. I fitted the SRi linkage to my first Mi16 and it made it less jerky. Share this post Link to post Share on other sites
