MarkSubaruLegacy Posted May 15, 2015 Posted May 15, 2015 Is it possible to swap an H6 engine and possibly the transmission into my 1999 legacy GT Sedan Automatic. My current 2.5 is a slow slug and I would like my car to be unique and have good power to climb the mountains here in Colorado. I am not interested in a turbo system due to reliability issue with the turbos. What would be the best years H6 engine with most power and reliability and would the joining transmission fit where mine currently lives? I realize I would probably have to change the entire wiring harness. Did any of the H6 set-up have a Limited slip diff? thanks for positive input. Respectfully, Mark
SockMonkey Posted May 15, 2015 Posted May 15, 2015 It's physically possible. They bolt right up, but issue is wiring from my understanding. It's not just a bolt in swap. You either have to run the H6 ECU and merge the wiring harness (I don't know whats involved) or run a stand alone ECU for just the engine. What I hate about this forums search function is that you can't search just 'h6' because it's only 2 letters.
johnegg Posted May 15, 2015 Posted May 15, 2015 you can't search just 'h6' because it's only 2 letters. . what happens if you search H6** ?
whitetiger Posted May 15, 2015 Posted May 15, 2015 there is a lot involved for a daily driver. OP you gonna be doing the work? If not, better off getting a different car.
Gt_Legacy Posted May 16, 2015 Posted May 16, 2015 mighty car mods did it in a wagon, they have the whole build on a youtube series
digdug18 Posted May 18, 2015 Posted May 18, 2015 I am not interested in a turbo system due to reliability issue with the turbos. What reliability issue? So long as you don't aren't going for massive hp/tq numbers, then there isn't an issue. Stay with the 5psi on the stock motor that others on the board are getting and you'll be fine. Although in all honesty I think while a h6 or turbo are fun and worthwhile upgrades, you'd find that the weak link will be your transmission. The H6, as in the SVX, will destroy your transmission if you don't first do some upgrades, a transmission cooler mainly. Many other people in colorado get around just fine without a bigger engine. I lived there for 5 years, and was able to easily make it over mountain passes with a 1994 civic. For easier driving though I'd suggest that you spend the money that you would be spending on the swap on front and rear lsd's, a mild lift and a transmission cooler to keep your transmission's temperatures lower to increase transmission life at lower rpm's. HP is great, but if you can't get grip then it doesn't matter. Andrew
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