Only a quick question
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Sorry, Tony..I can't see it mate: You dump the charge in the system, instead of keeping it, so the ECU sees MORE air rushing in than it expects and adds more fuel.......for the air that was actually dumped......meaning EXTRA fuel....not less?
After all, the ECU only controls the fuelling, the driver controls the amount of air?
Or am I completely bonkers?
I thought the remapping was to irradicate the richness which resulted from the overfuelling, which could lead to nasties like bore-wash.
[Edited by Turbo_Steve - 6/2/2003 10:51:19 PM]
After all, the ECU only controls the fuelling, the driver controls the amount of air?
Or am I completely bonkers?
I thought the remapping was to irradicate the richness which resulted from the overfuelling, which could lead to nasties like bore-wash.
[Edited by Turbo_Steve - 6/2/2003 10:51:19 PM]
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RE: Dump valves
I've heard the atmospheric type can be a pain in the backside when idling etc, but I've seen an advert for the bailey EVO, dual piston jobbie that's supposed to eliminate these problems. Does anyone run one of these, and are they any good?
I've heard the atmospheric type can be a pain in the backside when idling etc, but I've seen an advert for the bailey EVO, dual piston jobbie that's supposed to eliminate these problems. Does anyone run one of these, and are they any good?
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I used to have an Escort RS Turbo and I put a Bailey dual piston dump valve on that. The dual piston design of the Bailey dump valve overcomes the idling problems. You do not even need to get it set up on the rolling road after! They look good and of course sound brilliant! Go for it mate and get a Bailey dump valve!
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From: 1600cc's of twin scroll fun :)
The downside with dta dv's is that they can lean your mixture out (which isnt a good thing 
)
If you have an ecu thats been mapped to run one of these then there shouldnt be any problems, otherwise it can be a minefield
Tony
)If you have an ecu thats been mapped to run one of these then there shouldnt be any problems, otherwise it can be a minefield
Tony
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How does a VTA lean your mixture? As I understand it, they cause the MAF to read MORE air going into the system because the re-circ isn't there, so the ECU runs rich, not lean? Hence the pops & bangs?
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From: 1600cc's of twin scroll fun :)
Scoobs run rich to start with, hence the pops n bangs on a full decat system, the dta (i shall try to get this right 
) dumps its gasses in one go, the ecu and maf sense this and compensate, unfortunately when they compensate for something they wernt designed to compensate for they add more air (making the mixure leaner as it doesnt need anymore air), this is where you get your lean spot.
Its not long but it can be damaging (hence why scoobs dont like dta dv's unless mapped for them).
Tony
) dumps its gasses in one go, the ecu and maf sense this and compensate, unfortunately when they compensate for something they wernt designed to compensate for they add more air (making the mixure leaner as it doesnt need anymore air), this is where you get your lean spot.Its not long but it can be damaging (hence why scoobs dont like dta dv's unless mapped for them).
Tony
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