Quote:
Originally Posted by RST
Angelo, a thought / question I’ve got for you and the other guys:
Purely for my own interest as I do a fair bit of control systems at work, but there may be some merit in this project (worth thinking about maybe anyway) -or just discount it LoL).
When some of the MR2 guys have done the ST205 cc conversions on their cars they’ve run the cc pump constantly. Now I think they’ve been using second hand or refurbished pumps –but they’ve commented running the pump all the time reduces the lifespan of the pump (I’ve heard of some failing anyway).
I know on my GT4, the pump starts when you blip the throttle (say when the rpm goes > 1,000) and it stops running say 1min after the revs drop below that again. So when the cars warming up or sitting parked and running or sitting at junctions for long periods the pump stops because it’s not needed.
I know an SC is effectively boost on tap from the word go –but in my eyes anyway it would be a neat trick to use a spare channel on the Motec to switch a relay on/off based on RPM. Should be able to do that I guess? ….maybe I’ll be corrected and it’s not worth it though.
Also, again (I like neatness) I’d install a few sensors as you go along:
Oil temp
Oil pressure -this and the one above on an oil filter sandwich plate
IAT at the manifold (ECU'll need it anyway) -Bosch do a neat sensor
….and wire them into the Motec rather than straight to standalone gauges. I’m assuming that Motec will allow you to pull all those parameters out from the ECU on output channels as well. I’d run a single multi core cable from the engine bay (7 or 9 cores or summit like that) up to the dash and wire-in any gauges you want to the multicore rather than running separate lines etc. Just make sure you leave about 2.5m spare on the multicore at the dash -strip the outer sheath and you can coil up unused cores neatly out of the way for a "rainy day". Or even better IMO (and I’m not sure Motec have this) –is there an LCD display for the ECU available which can show all the engine stuff? Again –bit neater if there is and it would mean when you buy the senders –the money you save on gauges could go towards the display. I’ve never really found a tidy place to put gauges in my MR2 personally.
I’d recommend an oil temp display of some sort anyway –I know it’s warmer were allot of you guys live, but in the UK I’m surprised just how long the oil takes to warm-up to normal temperature sometimes.
One last question –TTS performance (UK) s/c’d a Mitsubishi Colt for one of the Japanese car magazines over here. On that car they said they have to keep an eye on the Rotrex’s oil level. Do Rotrex’s use oil then (I’m guessing so) –can they be plumbed into the engine oil circuit or is a different oil? Just curious!
(sorry for the long post guys –didn’t mean to be that long when I started, maybe some of this is covered already)
....Thanks for the write-up so far by the way. This is a really interesting read and I'm sure it will work out to be a sweet install when it's done!
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ON/OFF switching on the fuel pump was done purely for Emissions, when in boost it would push a bit more current to the pump, from I *think* 9volts up to full 12 to 13 volts....initial starting however is another deal when the pump switches *ON* to *prime* the fuel rail. It should stay on even during idle no matter what, what you hear is probably the emissions voltage control.
Walbro's DO NOT FAIL, not that I know of, never had any fail, nor anyone I know....they should last a good part of forever....think of Direct Injection Diesels those f*ckers run on 1000 psi fuel pumps, they have to be constant on....