karlyoung
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Servo vacuum and throttle bodies
Planning a gsxr throttle body conversion on the pinto. Want to keep the brake servo. The gsxr throttle bodies have a vacuum take off on each port, I'm thinking of putting each one to a vacuum rail/collector with extra take offs for the map sensor and vac gauge and one larger one for the brake servo. Any thoughts on whether this will be enough vacuum for the servo?
Cheers
Karl
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2lt_Scort
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Re:Servo vacuum and throttle bodies
2012/07/11 07:38:58
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Hi Karl,
When I still had a brake booster installed I had a vac fitting from each port on inlet manifold and used the take off on each throttle body for map.
Rhys
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Matt75
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Re:Servo vacuum and throttle bodies
2012/07/11 20:21:23
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Hi Mate,
You'll need one take off on each port for the brake booster.
I have heard that it's best to plumb the vaccuum take offs into a plenum of sorts for the MAP sensor otherwise you'll get phasing and it'll be all over the shop.
Can't you use the TPS rather than a MAP sensor?
There is a lot of info on Turbosport about this topic if you haven't already looked.
Cheers
Matt
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karlyoung
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Re:Servo vacuum and throttle bodies
2012/07/17 23:36:43
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Gonna weld a bit of pipe
up and use it as a vac chamber and drill tap some holes for all the vac take offs.
Can I not use TPS and MAP. Gonna be using a megasquirt Ecu?
Cheers for the info will
Check out turbo sport
Karl
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RS 2000
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Re:Servo vacuum and throttle bodies
2012/07/18 09:57:01
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You can use both sensors in either case.
If you run a 'big' camshaft Tps load sensing is the go, map sensor gets used for barometric correction in which case it doesn't get connected to vacuum signal, it just stays open to atmo.
If you go with map load sensing, tps only gets used for transient enrichment calculation. (throttle pump)
Cheers
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Matt75
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Re:Servo vacuum and throttle bodies
2012/07/18 09:58:41
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Are there advantages to using both over just one or the other?
Matt
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Re:Servo vacuum and throttle bodies
2012/07/18 10:26:26
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With T/B vacuum signal becomes 'unusable' for map sensor tuning. A cammed up engine may have very poor vac signal at idle and low engine speeds, also some engines at higher engine speeds may go to 0 vac as early as 60-70% throttle opening(especialy with largish t/Bs) none of which are usable for map tunning. When tuned in 'TPS' you can get all these areas spot on. dont get me wrong, it can be done in 'MAP', but you will get a much better and 'crisp' tune from a TPS load sens. Its something you should decide initialy as changing latter down the track may entail a whole new remap on the dyno.
Cheers
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Re:Servo vacuum and throttle bodies
2012/07/18 10:36:48
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Matt75
Are there advantages to using both over just one or the other?
Matt
You must use both for correct tune in both scenarios. Not using both will be a compromise. MAP alone will not have transient enrichment, and tps alone will not have Barrometric correction. There is also other functions that can be run from these sensors, so you should always run them. Cheers
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Matt75
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Re:Servo vacuum and throttle bodies
2012/07/18 10:38:52
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I never knew that.
If you were to choose one over the other which one would it be?
Matt
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Re:Servo vacuum and throttle bodies
2012/07/18 10:42:08
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FOR n/a engine with T/b's TPS load sens every time.
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Matt75
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Re:Servo vacuum and throttle bodies
2012/07/18 10:43:41
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karlyoung
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Re:Servo vacuum and throttle bodies
2012/07/18 11:14:48
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Excellent, thanks for that. I'll just use the take offs for the servo then.
Karl
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rallyrs
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Re:Servo vacuum and throttle bodies
2012/10/03 22:14:02
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karl,
I use gsxr's tb's off my MSII using the gsxr TPS and injectors. Works a treat, never had an issue in 3years of club work. Did pop a bit off idle, fixed that by sync'ing the TB's
mk2 2dr club car. pinto, stage 1 valves, rl31 cam, gsxr 600 tb running MS2 extra. :-)))
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karlyoung
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Re:Servo vacuum and throttle bodies
2012/10/03 22:25:13
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Thats good news, hoping to get it up and running in the next month, just waiting on pump and px reg. You running this on a pinto? If so could i have a copy of your map to get me started? How did you go about sorting the throttle cable out? any pics would be great i've struggled to find any on the net. Cheers Karl. karl.young80@gmail.com
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rallyrs
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Re:Servo vacuum and throttle bodies
2012/10/07 17:46:54
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using a long cable on a pinto. I'll snap some photos and email them to you with the my settings. Still using the factory nipple type arrangement with the bracket welded to the rocker cover.
mk2 2dr club car. pinto, stage 1 valves, rl31 cam, gsxr 600 tb running MS2 extra. :-)))
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