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2013-14 Shelby GT500
10% Lower + 2.5 Upper on a '13
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<blockquote data-quote="Jam421" data-source="post: 15600415" data-attributes="member: 110985"><p>Sometimes I regret starting with the 2.4 upper. I should have gone 10% lower from the jump and I'd likely be an added 1 psi and be safer at mid 17's. Regretfully I don't have the stock upper. Maybe I could consider the VMP hub with a 2.5 or even 2.6 upper + 10% ? Fuel Pump Booster no doubt also a consideration.</p><p></p><p>A friend of mine just mounted a 13-14 stock upper pulley trinity on an 5.4L '07. He thought he had a 10% IW below but pulled 650rwhp on a Mustang Dyno at 19.8psi max boost. That's 5-6psi over stock ! Maybe his lower was 15% ..don't know. Oh...#52 Injectors. On a Dynojet that could be 690-700rw.</p><p>NO BAP. Stock 2007 fuel pumps. I'm dying because I'm was almost pleading for him to get bigger than 52 injectors + definitely BAP ! Dyno pulls were on stock clutch which let go. He's breaking in a new clutch so hasn't jumped on it. He is hard on the car and will go drag racing. I can't EVER imagine that combo on my once owned 2008 coupe. I feel bad because I don't want to be a PIA.</p><p>I hoped he'd at least reconsider the BAP. NOPE.</p><p></p><p>So I hear you fellas. Engine Safety First. It's not worth the risk.</p><p>And....I appreciate all the advice. Thx....Jam</p></blockquote><p></p>
[QUOTE="Jam421, post: 15600415, member: 110985"] Sometimes I regret starting with the 2.4 upper. I should have gone 10% lower from the jump and I'd likely be an added 1 psi and be safer at mid 17's. Regretfully I don't have the stock upper. Maybe I could consider the VMP hub with a 2.5 or even 2.6 upper + 10% ? Fuel Pump Booster no doubt also a consideration. A friend of mine just mounted a 13-14 stock upper pulley trinity on an 5.4L '07. He thought he had a 10% IW below but pulled 650rwhp on a Mustang Dyno at 19.8psi max boost. That's 5-6psi over stock ! Maybe his lower was 15% ..don't know. Oh...#52 Injectors. On a Dynojet that could be 690-700rw. NO BAP. Stock 2007 fuel pumps. I'm dying because I'm was almost pleading for him to get bigger than 52 injectors + definitely BAP ! Dyno pulls were on stock clutch which let go. He's breaking in a new clutch so hasn't jumped on it. He is hard on the car and will go drag racing. I can't EVER imagine that combo on my once owned 2008 coupe. I feel bad because I don't want to be a PIA. I hoped he'd at least reconsider the BAP. NOPE. So I hear you fellas. Engine Safety First. It's not worth the risk. And....I appreciate all the advice. Thx....Jam [/QUOTE]
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2013-14 Shelby GT500
10% Lower + 2.5 Upper on a '13
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