Preface: I really hope that I'm not opening a religious war with this question; that's not my intent! I've seen the thread on stage 1 upgrades and the consensus seems to be that when it comes to SC tuning, there are three "standards," and they seem to be somewhat equivalent with happy customers advocating each mod path.
In my GT research there seems to be two routes to improved horsepower for those seeking to enter the 850+ range: twin turbo installations by either Heffner or Hennessey. As near as I can tell, they seem to take different approaches (I'm sure someone will correct me if I'm wrong!).
As nearly as I can tell, the Heffner approach is to replace the supercharger with twin turbo chargers, while the Hennessey solution seems to be built around the stock supercharger with the addition of the twin turbos, so you have a car with a supercharger AND twin turbos.
Both seem capable of approximately equivalent hp gains. Anecdotally (and based on company marketecture) the Hennessey approach to adding the twin turbos to the supercharged solution moves the available torque lower in the rpm band and eliminates turbo lag (at least to some degree). That seems to my inexperienced judgement to seem more nicely suited to day-to-day driving (and here is where you chime in to opine whether it makes any sense at all to do much street driving with a 1000hp GT!).
So, experts, can you provide your real-world experience and opinions as to the pros and cons of the TT paths?
As a near-future GT or GTX1 owner, this will be very helpful in my purchase and after-market decisions! Those of you with wives will understand that it's sometimes easier to buy a car that's already been tuned than it is to finagle the budget for expensive aftermarket mods once the car's in the garage!
And here's the second question, where everyone gets to vent their opinion: In the GT pricing I've done there are commonly both Heffner and Hennessey TT GT's available on the market and against all expectation, people who're selling them seem to have the expectation that a modded car not only holds its value, but that the cost of the mods themselves should be largely recouped (seemingly around 75-90%+)!
I haven't found this to be the case with other cars, where people seem happy to get back 15-40% of the cost of their mods (usually without labor!). But since it seems to be the case with GT's, I had to ask: Do you have an opinion which of the three hp upgrade paths (SC tune, Heffner TT, or Hennessey TT) tends to fare best when it comes to resale value (and why)?
Discuss.
In my GT research there seems to be two routes to improved horsepower for those seeking to enter the 850+ range: twin turbo installations by either Heffner or Hennessey. As near as I can tell, they seem to take different approaches (I'm sure someone will correct me if I'm wrong!).
As nearly as I can tell, the Heffner approach is to replace the supercharger with twin turbo chargers, while the Hennessey solution seems to be built around the stock supercharger with the addition of the twin turbos, so you have a car with a supercharger AND twin turbos.
Both seem capable of approximately equivalent hp gains. Anecdotally (and based on company marketecture) the Hennessey approach to adding the twin turbos to the supercharged solution moves the available torque lower in the rpm band and eliminates turbo lag (at least to some degree). That seems to my inexperienced judgement to seem more nicely suited to day-to-day driving (and here is where you chime in to opine whether it makes any sense at all to do much street driving with a 1000hp GT!).
So, experts, can you provide your real-world experience and opinions as to the pros and cons of the TT paths?
As a near-future GT or GTX1 owner, this will be very helpful in my purchase and after-market decisions! Those of you with wives will understand that it's sometimes easier to buy a car that's already been tuned than it is to finagle the budget for expensive aftermarket mods once the car's in the garage!
And here's the second question, where everyone gets to vent their opinion: In the GT pricing I've done there are commonly both Heffner and Hennessey TT GT's available on the market and against all expectation, people who're selling them seem to have the expectation that a modded car not only holds its value, but that the cost of the mods themselves should be largely recouped (seemingly around 75-90%+)!
I haven't found this to be the case with other cars, where people seem happy to get back 15-40% of the cost of their mods (usually without labor!). But since it seems to be the case with GT's, I had to ask: Do you have an opinion which of the three hp upgrade paths (SC tune, Heffner TT, or Hennessey TT) tends to fare best when it comes to resale value (and why)?
Discuss.
