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Time to go twin turbo.

Old 02-12-2019, 12:18 AM
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Default Time to go twin turbo.

I think it's time to try a twin setup. Wondering how twin magnum 7675's would work with a 5.7 with triple 12 cam. I would like this setup to spool up quick and be capable of 800 hp to the wheels. I already have one 7675 so figured I get some opinions on turbo selection. Let me know what you think.
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Old 02-12-2019, 04:58 AM
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That’s a lot of turbo for twins, I would think something like twin 6266’s on a 5.7 would even take you along ways. Idk
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Old 02-12-2019, 08:29 AM
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Originally Posted by 03sierraslt View Post
Thatís a lot of turbo for twins, I would think something like twin 6266ís on a 5.7 would even take you along ways. Idk
I dont really understand turbo math. That's why I'm looking for opinions.
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Old 02-12-2019, 08:36 AM
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Originally Posted by 03sierraslt View Post
Thatís a lot of turbo for twins, I would think something like twin 6266ís on a 5.7 would even take you along ways. Idk
i agree and think 76s on each side would take forever to spool on a small ci engine with a mild build.
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Old 02-12-2019, 09:40 AM
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Most likely more turbo than needed. I have a Trick twin kit sitting here for the day I find the right truck but I had it setup for Borg S257sxe's (57/61's) but will be going with a 6.0 most likely. I believe that those turbos will light very quickly, give me a good power band up to 6300-6500rpm, and should be no problem 800whp or better.

A guy I talked with said he made 740/810 @ 16psi on a 6.0 with the S251's which are sized a bit smaller the the SXE models (47lbs./min. vs 65lbs./min airflow) and Borg rates the S257sxe's at 625hp.

Another combo - 383 with a pair of cast Turbonetics 6265's on a manual transmission made 1012/972 @ 19psi. Said the turbos made more steam (around 1200whp) on a smaller cubic inch engine.

Just to give you an idea for comparisons
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Old 02-12-2019, 10:25 AM
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Thanks guys. Glad I asked the cheap side of me wanted to only buy one turbo . So I'll check around for 6265 or 6266's. What about wastegates? How do I size them? Just go by the size of the turbo's? I'm thinking of using a treadstone trttc9 intercooler and turbosmart raceport bov.
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Old 02-12-2019, 10:31 AM
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I would talk to a expert before buying any specific turbos. It’s all about airflow, how much power do you wanna make? And what rpm do you wanna turn? It seems you need roughly 10lb/min of air for every 100hp at the flywheel, someone please correct me if I am wrong.
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Old 02-12-2019, 10:52 AM
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Originally Posted by 03sierraslt View Post
I would talk to a expert before buying any specific turbos. Itís all about airflow, how much power do you wanna make? And what rpm do you wanna turn? It seems you need roughly 10lb/min of air for every 100hp at the flywheel, someone please correct me if I am wrong.
I will want to be capable of 800 to the wheels. I want some more power down low that's why I'm thinking fast spooling. My truck is a daily and it will be more fun having a little more down low. I may need to call a few turbo manufacturers and get there opinions. It definitely needs to beet my nephews ford velociraptor.
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Old 02-12-2019, 11:12 AM
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Check speed engineering's new twin kit. Turbonetics 64mm turbos, you can get a bigger turbine AR (.85 I think) to get the power you want. $3999 complete.

https://www.performancetrucks.net/fo...o-kits-550048/
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Old 02-12-2019, 11:17 AM
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Originally Posted by 1CAMWNDR View Post
Check speed engineering's new twin kit. Turbonetics 64mm turbos, you can get a bigger turbine AR (.85 I think) to get the power you want. $3999 complete.

https://www.performancetrucks.net/fo...o-kits-550048/
I already have trick performance manifolds. If I didn't I probably would have purchased that kit just to try it out.
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