Ok, so I'm open to suggestions... Twin Turbo & EFI
Posted: Sun Feb 02, 2014 6:12 pm
Ok campers, help me out here.
If I was interested in swapping my dual carbs and roots setup for either blow-through or EFI behind twin turbos, what and where would you suggest I start ?
My 'little' 427 big block has a good bottom end, high flow (for this build) dart heads and a pretty hard core top end (billet cam, solid bush rollers, thick wall push rods and shaft rockers, etc.). I'm making somewhere quite a bit north of 800 hp at the flywheel but there is a lot of engine weight and old school iron in the build. Add to that all the original sheet metal and glass in the body together with the heavy back half frame components, etc. - it's a lot of iron to push down the track. My best ET with this build is 9.75 @ 139 mph. The current build is pretty stout, but it takes a lot of grunt to get it across the stripe that quickly.
All this is great, but I'm getting the itch to try something different and I need to start gathering info and facts.
I have a pretty big investment in this OEM 4-bolt 454 block, blower pistons and eagle bottom end. It's 4340 stuff with heavy forged pistons and it's been malloried out the kazoo for balancing. Pretty smooth and pretty tough, but resulting in a pretty small displacement motor. And, I call this a 427, but at .030 over, it's actually around 434 ci. 427 just sounds better, ya know ?
Would it be worth the horsepower and torque gain to swap out the current crank, rods and pistons for a bigger displacement stroker kit ? I could prolly push this 4-bolt 454 block to what, 505 ci or so ? More cubes, but would the cost be worth the gain ? My little 427 performs like a small block with the short throw and sweet power band and it works well with my roots system. I don't know how a bigger displacement motor works with blow-through or EFI behind a turbo system. Is my current 427 build a good base for this new turbo setup ?
If I step up the displacement I would end up needing to push more air and could hit the wall with these virgin Dart 310's. They have the bigger 2.30 intakes and have been port matched but otherwise are virgin. I don't know where the 310's might stop working. I'd prefer not to have to port the heads or swap them out, but I don't have a clue when these puppies will stop working.
Then, there's the whole matching the turbo plenum diameter and injector size with the EFI or blow through system, spec'ed to work with my cam profile and advance setup, TH400 and t-brake, gearing, etc.
Without spinning this too far out, what would you guys suggest ? Would you take the easy route and just hang a set of turbos with a blow through carb on this little motor ? Or what ? Keeping the current small displacement motor and swapping out the power adder *might* make more horsepower, will certainly do it with less weight, but other than having some fun new hardware to play with, am I gaining anything ?
I'm open to suggestions and know there's a ton of talent and experience out there with you guys.
If I was interested in swapping my dual carbs and roots setup for either blow-through or EFI behind twin turbos, what and where would you suggest I start ?
My 'little' 427 big block has a good bottom end, high flow (for this build) dart heads and a pretty hard core top end (billet cam, solid bush rollers, thick wall push rods and shaft rockers, etc.). I'm making somewhere quite a bit north of 800 hp at the flywheel but there is a lot of engine weight and old school iron in the build. Add to that all the original sheet metal and glass in the body together with the heavy back half frame components, etc. - it's a lot of iron to push down the track. My best ET with this build is 9.75 @ 139 mph. The current build is pretty stout, but it takes a lot of grunt to get it across the stripe that quickly.
All this is great, but I'm getting the itch to try something different and I need to start gathering info and facts.
I have a pretty big investment in this OEM 4-bolt 454 block, blower pistons and eagle bottom end. It's 4340 stuff with heavy forged pistons and it's been malloried out the kazoo for balancing. Pretty smooth and pretty tough, but resulting in a pretty small displacement motor. And, I call this a 427, but at .030 over, it's actually around 434 ci. 427 just sounds better, ya know ?
Would it be worth the horsepower and torque gain to swap out the current crank, rods and pistons for a bigger displacement stroker kit ? I could prolly push this 4-bolt 454 block to what, 505 ci or so ? More cubes, but would the cost be worth the gain ? My little 427 performs like a small block with the short throw and sweet power band and it works well with my roots system. I don't know how a bigger displacement motor works with blow-through or EFI behind a turbo system. Is my current 427 build a good base for this new turbo setup ?
If I step up the displacement I would end up needing to push more air and could hit the wall with these virgin Dart 310's. They have the bigger 2.30 intakes and have been port matched but otherwise are virgin. I don't know where the 310's might stop working. I'd prefer not to have to port the heads or swap them out, but I don't have a clue when these puppies will stop working.
Then, there's the whole matching the turbo plenum diameter and injector size with the EFI or blow through system, spec'ed to work with my cam profile and advance setup, TH400 and t-brake, gearing, etc.
Without spinning this too far out, what would you guys suggest ? Would you take the easy route and just hang a set of turbos with a blow through carb on this little motor ? Or what ? Keeping the current small displacement motor and swapping out the power adder *might* make more horsepower, will certainly do it with less weight, but other than having some fun new hardware to play with, am I gaining anything ?
I'm open to suggestions and know there's a ton of talent and experience out there with you guys.