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2015+ Shelby GT350 Mustang
Forced Induction: Whipple or Twins
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<blockquote data-quote="ANGREY" data-source="post: 16051797" data-attributes="member: 188865"><p>Some other considerations:</p><p></p><p>1) The whipple option also presents the challenge of the hood and clearance. It's resolved (bandaid) by using lowering engine mounts, but for those already concerned about ground clearance, it's basically just dropping the powertrain lower so it'll fit under the hood. I have yet to see an aftermarket hood/top side solution.</p><p></p><p>2) Turbos are gonna give you a heat source regardless of the boost you run. Lower boost is simply a function of wastegate and running the exhaust through hair dryers is going to create a heater, low boost or not. This is where heat shielding helps with turbos.</p><p></p><p>3) Turbos change the character of the exhaust note. For those of us that love/cherish the way a V-8 sounds, adding hair dryers definitely tames/restricts it (to a noticeable degree). Maybe that's good or bad for you, but the whine of a twin screw and the exhaust note are going to be appreciably different than twins. This probably has to do with the fact that you can still run long tubes with the twin screw setup (which make the car sound glorious).</p><p></p><p>4) Twins seems a bit of a solution to a problem that doesn't exist. The car has plenty of top end go, it's just the low end response that most driver's don't like. Most of us are used to the glorious torque and the ability to be in 6th or 5th at low rpm and feel the car respond when asked. THAT seems to be the biggest complaint of the high revving FPC voodoo motor. You don't hear a lot of guys complaining about running out of ponies at full wail. Turbos would help a LITTLE on the lower end, but not much (especially if you go big hair dryers).</p><p></p><p>5) I know over the years that "turbo lag" has been reduced greatly, but it's still there. Granted, as you point out, the power band of the Voodoo kinda mimics turbo lag, but the twin'd cars I drove (even though they're better than the old big singles) still made me frown because the responsiveness and sudden run up felt jerky.</p><p></p><p>6) I guess it all depends on what you're trying to "solve." Some people like how turbos make the car pedestrian at normal driving conditions with the added getup at WOT/high rpms. But as I've stated above, I think most guys who add a power adder are looking to resolve the biggest knock against the voodoo which is low end seat dyno numbers. If you're just looking for a street/roll race monster, then twins is a better option. If you're looking to have more low end response then twin screw is definitely the ticket. Neither is going to appreciably improve it's track capabilities/characteristics. The turbos aren't going to mess with the balance as much as the TS by putting 60 extra lbs on the front. But both are going to add to overheat/limp worries. Are turbos really going to help with entries and exits in the turns? A twin screw setup might, but as you pointed out, it doesn't do much good to improve your lap times if you can only run a few laps before heat injury. And even then it's an assumption that the added weight and worse balance doesn't negate the added torque.</p><p></p><p>I've thoroughly researched and thought this whole aspect through and I'm still not TOTALLY decided but I've leaned back toward just leaving the car N/A. If I want a street/strip beast I'll get a different vehicle which is MUCH more suited to it.</p></blockquote><p></p>
[QUOTE="ANGREY, post: 16051797, member: 188865"] Some other considerations: 1) The whipple option also presents the challenge of the hood and clearance. It's resolved (bandaid) by using lowering engine mounts, but for those already concerned about ground clearance, it's basically just dropping the powertrain lower so it'll fit under the hood. I have yet to see an aftermarket hood/top side solution. 2) Turbos are gonna give you a heat source regardless of the boost you run. Lower boost is simply a function of wastegate and running the exhaust through hair dryers is going to create a heater, low boost or not. This is where heat shielding helps with turbos. 3) Turbos change the character of the exhaust note. For those of us that love/cherish the way a V-8 sounds, adding hair dryers definitely tames/restricts it (to a noticeable degree). Maybe that's good or bad for you, but the whine of a twin screw and the exhaust note are going to be appreciably different than twins. This probably has to do with the fact that you can still run long tubes with the twin screw setup (which make the car sound glorious). 4) Twins seems a bit of a solution to a problem that doesn't exist. The car has plenty of top end go, it's just the low end response that most driver's don't like. Most of us are used to the glorious torque and the ability to be in 6th or 5th at low rpm and feel the car respond when asked. THAT seems to be the biggest complaint of the high revving FPC voodoo motor. You don't hear a lot of guys complaining about running out of ponies at full wail. Turbos would help a LITTLE on the lower end, but not much (especially if you go big hair dryers). 5) I know over the years that "turbo lag" has been reduced greatly, but it's still there. Granted, as you point out, the power band of the Voodoo kinda mimics turbo lag, but the twin'd cars I drove (even though they're better than the old big singles) still made me frown because the responsiveness and sudden run up felt jerky. 6) I guess it all depends on what you're trying to "solve." Some people like how turbos make the car pedestrian at normal driving conditions with the added getup at WOT/high rpms. But as I've stated above, I think most guys who add a power adder are looking to resolve the biggest knock against the voodoo which is low end seat dyno numbers. If you're just looking for a street/roll race monster, then twins is a better option. If you're looking to have more low end response then twin screw is definitely the ticket. Neither is going to appreciably improve it's track capabilities/characteristics. The turbos aren't going to mess with the balance as much as the TS by putting 60 extra lbs on the front. But both are going to add to overheat/limp worries. Are turbos really going to help with entries and exits in the turns? A twin screw setup might, but as you pointed out, it doesn't do much good to improve your lap times if you can only run a few laps before heat injury. And even then it's an assumption that the added weight and worse balance doesn't negate the added torque. I've thoroughly researched and thought this whole aspect through and I'm still not TOTALLY decided but I've leaned back toward just leaving the car N/A. If I want a street/strip beast I'll get a different vehicle which is MUCH more suited to it. [/QUOTE]
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Forced Induction: Whipple or Twins
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