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SN95 Cobras
98 cobra vortech boost ?
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<blockquote data-quote="ZeroDCX" data-source="post: 15594750" data-attributes="member: 91953"><p>You could remove the power pipe to drop boost some (~-2psi) and reduce timing to de-tune power output to safe levels. How much timing are you running?</p><p></p><p>In all actuality, if I were in your position, I would run a wastegated setup (assuming you're air-to-air intercooled). Run the stock 3.6'' pulley and release all boost pressures above 8psi to atmosphere. You would have the best of both worlds, higher centrifugal increased adiabatic efficiency and more torque at lower RPMs (sooner and flatter power/torque curves).</p><p></p><p>Regarding your fuel issue, are you seeing black smoke at WOT? You could just be running rich. I'm sure your tuner did this to ensure some form of safety too (Cooler combustion temperatures to prevent pre-detonation). Did you try to run the car w/ the FPR vacuum line disconnected and check for leaks? (It can take a while at times). Also are you sure you don't have any exhaust leaks. Remember that you have a catless x-pipe and possibly a rich tune, so there will be some associated unburned fuel smells. Do you have a wideband to monitor A/F ratio? What do your spark plugs look like after a WOT pull? Also post MAF boost leaks will cause the car to run rich as metered air is escaping and not being consumed by the engine, while the ECM is commanding fuel to meet metered MAF demand. Just something else to look out for.</p><p></p><p>Edit: Just saw your comment concerning the schrader valve. I would replace it. It could be leaking under increased pressures (under boost). Fuel pressure increases w/ boost one-to-one above 0inHg, so a force induced system will see greater fuel pressures than naturally aspirated systems; Highlighting issues previously not seen before.</p></blockquote><p></p>
[QUOTE="ZeroDCX, post: 15594750, member: 91953"] You could remove the power pipe to drop boost some (~-2psi) and reduce timing to de-tune power output to safe levels. How much timing are you running? In all actuality, if I were in your position, I would run a wastegated setup (assuming you're air-to-air intercooled). Run the stock 3.6'' pulley and release all boost pressures above 8psi to atmosphere. You would have the best of both worlds, higher centrifugal increased adiabatic efficiency and more torque at lower RPMs (sooner and flatter power/torque curves). Regarding your fuel issue, are you seeing black smoke at WOT? You could just be running rich. I'm sure your tuner did this to ensure some form of safety too (Cooler combustion temperatures to prevent pre-detonation). Did you try to run the car w/ the FPR vacuum line disconnected and check for leaks? (It can take a while at times). Also are you sure you don't have any exhaust leaks. Remember that you have a catless x-pipe and possibly a rich tune, so there will be some associated unburned fuel smells. Do you have a wideband to monitor A/F ratio? What do your spark plugs look like after a WOT pull? Also post MAF boost leaks will cause the car to run rich as metered air is escaping and not being consumed by the engine, while the ECM is commanding fuel to meet metered MAF demand. Just something else to look out for. Edit: Just saw your comment concerning the schrader valve. I would replace it. It could be leaking under increased pressures (under boost). Fuel pressure increases w/ boost one-to-one above 0inHg, so a force induced system will see greater fuel pressures than naturally aspirated systems; Highlighting issues previously not seen before. [/QUOTE]
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