Strawman Posted June 17, 2013 Report Share Posted June 17, 2013 OK, so I've dusted off the cobwebs from my 2008 GT/SC automatic, now what? Had the Kenne Bell installed at SAI, car runs great (not quite like the 700hp+ Lingenfelter ZR1 I had until recently, but nice nonetheless), but how much meat is left on the bone? I assume the SAI tune is on the soft side, what kind of numbers am I likely at now, and what can I expect to get out of it within reason? Link to comment Share on other sites More sharing options...
HARALD KELLEY Posted June 17, 2013 Report Share Posted June 17, 2013 I think Shelby puts an automatic trans car tune at about 460ish give or take at the crank. The Paxton was at 460 +/-, Whipple I think is 475. Automatic, 4.6 not forged internals, anything north of 500 RWHP (if possible with the auto) and I think you have a grenade. Unless your not hard on the car. That said, others may have more info and are more optimistic. Link to comment Share on other sites More sharing options...
Strawman Posted June 17, 2013 Author Report Share Posted June 17, 2013 If there is a 20% auto driveline loss, 460 at the crank yields about 370 rwhp. If I could see something in the 425 rwhp range I'd be happy, but I'm not interested in a grenade. Link to comment Share on other sites More sharing options...
HARALD KELLEY Posted June 18, 2013 Report Share Posted June 18, 2013 If there is a 20% auto driveline loss, 460 at the crank yields about 370 rwhp. If I could see something in the 425 rwhp range I'd be happy, but I'm not interested in a grenade. Not sure about the 20% loss. My GT-H is at 424 RWHP with 367 tq. It was dyno at SAI. Some others may have more insight & info. Link to comment Share on other sites More sharing options...
speedyburd33 Posted June 19, 2013 Report Share Posted June 19, 2013 I've been told by several experienced dyno tuners that automatic cars have 20% loss and manual cars have 18%. A new tune will help get those HP numbers up for sure. Like H0050 said though, anything over 500 at the wheels is a ticking time bomb. I decided to do completely forged internals balanced and blueprinted, with custom cams, ported heads, etc. I am expecting to get my car back from Tasca next week and we are expecting about 600-610 at the wheels. Link to comment Share on other sites More sharing options...
springer Posted June 20, 2013 Report Share Posted June 20, 2013 450 hp at the rear wheels pretty much has the engine maxed out. I would leave well enough alone. They don't look pretty when they go. Even if you squeaked another 50 hp out of it, I doubt it would make any significant difference in performance, except for more tire spin. Link to comment Share on other sites More sharing options...
Strawman Posted June 22, 2013 Author Report Share Posted June 22, 2013 This from the guy with 501 RWHP? I agree, though, the more I drive it the more content I've become, it aint no rocket ship, but it sure has style. Link to comment Share on other sites More sharing options...
twobjshelbys Posted June 22, 2013 Report Share Posted June 22, 2013 Also discussed here: http://www.teamshelby.com/forums/index.php/topic/81141-max-hp-you-can-get-with-an-automatic Link to comment Share on other sites More sharing options...
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