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.

 

 

I dont really understand turbo math. That's why I'm looking for opinions.

 

i agree and think 76s on each side would take forever to spool on a small ci engine with a mild build.

 

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

 

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.

 

 

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.

 

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.