Little Toe Posted January 27, 2008 Share Posted January 27, 2008 Hi folk's, I've recently acquired a V8, 3.5L that's on SU carbs at the moment. It originally came out of a RoverSD1 and I'm about to get it transplanted into my truck. I'm thinking of going down the MegaJolt route so that the engine can run when wading. Now for the question... I'm not sure where to go for the TPS or MAP options - can anyone advise on the pros and cons of each option? Thanks Shaun Quote Link to comment Share on other sites More sharing options...
Jon White Posted January 28, 2008 Share Posted January 28, 2008 Go with the MAP sensor. There is no poncing about with sensitive electronics in a wet engine bay with that set up! Its wot I ran on my carbed V8. Jon Quote Link to comment Share on other sites More sharing options...
edwardatherton Posted January 28, 2008 Share Posted January 28, 2008 Now for the question... I'm not sure where to go for the TPS or MAP options - can anyone advise on the pros and cons of each option?Thanks Shaun There is plent of more detailed info on the autosportlabs forum, but basically I'd go with the MAP option for the reasons above! Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 28, 2008 Share Posted January 28, 2008 MAP every time. Quote Link to comment Share on other sites More sharing options...
Little Toe Posted February 6, 2008 Author Share Posted February 6, 2008 Thanks for the advice folks. Cheers Shaun Quote Link to comment Share on other sites More sharing options...
Little Toe Posted February 6, 2008 Author Share Posted February 6, 2008 Go with the MAP sensor.There is no poncing about with sensitive electronics in a wet engine bay with that set up! Its wot I ran on my carbed V8. Jon Jon, how/where did you tap into the inlet manifold to feed the MAP sensor? Cheers Shaun Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted February 7, 2008 Share Posted February 7, 2008 Jon, how/where did you tap into the inlet manifold to feed the MAP sensor?Cheers Shaun I used a spare port on the plenum: Quote Link to comment Share on other sites More sharing options...
ThreeSheds Posted February 7, 2008 Share Posted February 7, 2008 There is an interesting discussion of just this point (Rover v8 with SUs) at the Autosport Labs site which might help TwoSheds Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted February 7, 2008 Share Posted February 7, 2008 Ooops, I forgot you were running SU's. Ignore me Quote Link to comment Share on other sites More sharing options...
Jon White Posted February 7, 2008 Share Posted February 7, 2008 I didnt drill anything - i just used the standard take off on the inlet manifold that the vacuum advance was previously connected to. Jon Quote Link to comment Share on other sites More sharing options...
landmannnn Posted February 7, 2008 Share Posted February 7, 2008 I didnt drill anything - i just used the standard take off on the inlet manifold that the vacuum advance was previously connected to.Jon Jon, I tried mine like this and got it running ok. Then attached it like fridge has shown. The vac advance/retard take off gives a different map reading than direct to the plenum, I think it is not the right place to get map. I am sure fridge will be able to comment with more knowledge than me. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted February 8, 2008 Share Posted February 8, 2008 I've heard it said that the vac advance takeoff is a bit near the throttle butterfly and gets affected by turbulence or such like. On the RR (MS & Dizzy) I teed the dizzy feed into the same takeoff as my picture using a T connector in place of the elbow one. Quote Link to comment Share on other sites More sharing options...
Jon White Posted February 8, 2008 Share Posted February 8, 2008 Er.........plenium??? I was running on twin Su's!!!! Jon Quote Link to comment Share on other sites More sharing options...
steve_d Posted February 8, 2008 Share Posted February 8, 2008 You need a take the MAP vacuum direct from the manifold not from the base of one of the carbs. Some ignition systems take the vac for the dizzy from the carb base but the hole is either partially covered by the butterfly at tickover or is even the other side of the butterfly. If there is a takeoff for the brake servo a tee into that would be fine. Steve Quote Link to comment Share on other sites More sharing options...
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