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SVTPerformance's Chain of Restaurants
Tuning À la carte
SCT Prp help
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<blockquote data-quote="01blckcobra" data-source="post: 16069007" data-attributes="member: 92039"><p>Decipha was right, MAF functions needed adjustment. As much as 45% so far. </p><p></p><p><u>Addition information</u> - <u>might be helpful to someone later on.</u></p><p></p><p>Previous tune was for bone stock engine. Cars best run was 9.5 at 143.5 mph </p><p></p><p>It melted a piston on the street with 14psi </p><p></p><p>So after the rebuild, the car would always fluctuate A/F at above 4K pretty rapidly. Figured the tune was off. Tried to tune it but no change. Tried different injectors with good known data. No change. </p><p></p><p>Ended up going through the whole fuel system, vac line, lol you name it. everything pretty much had been replaced with new. </p><p></p><p>Well long story short the MagnaFuel 9950-B goes bad pretty quick. They will "bench test" okay but in real world it didn't work. The brass plunger wears very quickly against the stainless seat. I mean 4-6 good hits and the plunger is shot. Will not regulate fuel properly. "hold pressure" Would have a 3,5, 6, and whatever it felt like psi drop across.. Took 3 regulators to figure this out for me. lol new doesn't always mean good i guess.</p><p></p><p>Ended up going with FORE. Only experience a 2psi drop. Had no more issues and the car taking adjustments perfectly. Still not sure why the MAF is off so much but getting her dialed back in nicely now.</p></blockquote><p></p>
[QUOTE="01blckcobra, post: 16069007, member: 92039"] Decipha was right, MAF functions needed adjustment. As much as 45% so far. [U]Addition information[/U] - [U]might be helpful to someone later on.[/U] Previous tune was for bone stock engine. Cars best run was 9.5 at 143.5 mph It melted a piston on the street with 14psi So after the rebuild, the car would always fluctuate A/F at above 4K pretty rapidly. Figured the tune was off. Tried to tune it but no change. Tried different injectors with good known data. No change. Ended up going through the whole fuel system, vac line, lol you name it. everything pretty much had been replaced with new. Well long story short the MagnaFuel 9950-B goes bad pretty quick. They will "bench test" okay but in real world it didn't work. The brass plunger wears very quickly against the stainless seat. I mean 4-6 good hits and the plunger is shot. Will not regulate fuel properly. "hold pressure" Would have a 3,5, 6, and whatever it felt like psi drop across.. Took 3 regulators to figure this out for me. lol new doesn't always mean good i guess. Ended up going with FORE. Only experience a 2psi drop. Had no more issues and the car taking adjustments perfectly. Still not sure why the MAF is off so much but getting her dialed back in nicely now. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Tuning À la carte
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