I have been contemplating the idea of a roots style blower and turbo for awhile now. I read a few months back that the Meguiars type-R had this set-up. I have read all the posts on this board about this topic, but I still have a few questions.

1. If you were to run the turbo air through the intercooler, then run water/alcohol injection into the blower, it seems to me that the intake charge temp would be drastically reduced. Reduced enough that there shouldnt be any issues with above normal intake temps from the roots blower. Any ideas on this?

2. Say you were running the turbo at 6psi, then running the blower at 6psi would there be interference from the incoming turbocharged air into the blower? I would think that the blades of the eaton blower would have to spin that much faster with the 6psi of turbocharged air being shoved into them. Would this overheat the blower like when using a 10-12psi pulley?

3. I have a b16a in my hatch right now, but I also have a LS longblock sitting in my garage. I know that the b16a responds better to the eaton blowers, but the LS responds better to turbo (Well they make way more torque that is!). Which engine stock would be better to try the twin charger set-up on? I am thinking the LS, lower compression.

4. I am thinking the ideal psi level to push off of each charger would be 6psi on each. The eaton would be pushing the most efficient intake temps, and the turbo would barely be sweating at all. I figure on an LS block 12psi total is obtainable with the right tuning. Any thoughts?

I know that alot of people do not think that the twin charger set-up will work, but I really dont see any problem with having the car run right. Granted tuning will be very challenging, but I have walboro 255lph fuel pump, 440cc injectors, Spearco water injection kit and EFI PMS system, to get things running right (If i go the twin charger route will purchase the standalone software for better tuning window). I already have the MaxRev turbo kit, (3'' downpipe, manifold, t3/t4oe .63 a/r) so the power level at 6psi on that charger will be significant. I am looking at getting a used JRSC kit from somebody for like 1500ish. I already have my fuel set-up, turbo kit and all neccessary components so all that is left is picking up the JRSC and putting that on first.

My plan would be to install the supercharger first, tune that by the butt dyno just so that it doesnt knock at all. Next, install the turbo kit and run it at the .3 bar spring on the Tial wastegate and add some more fuel and take out mostly all of the timing so it doesnt knock. Up the boost to .4~.45 bar when I get to the dyno and tune it for a few hours. I really think that the twin charger set-up would work and produced some wicked power from idle to redline. If I do go with the LS engine, this would really complement the characteristics of the engine. With the 6800 rpm redline I would be making power immediately, and pulling like a crazy bastard till the short redline. The engine already makes decent torque numbers, but with this set-up I should be making V8 torque from idle to redline.

Any thoughts, comments or ideas would be greatly appreciated! Even if you dont like the idea let me know.

Thanks, Jeff

 

I am thinking hp levels at 12psi to be around 300whp and torque numbers 250ft-lbs at the wheels with this set-up.

 

if all you want is 300 whp and 250 tq @ 12 PSI just get a turbo and save yourself the time money and hassel

 

I am thinking that the LS will produce that kind of power with the turbo alone, but I never can get a straight answer out of anyone of exactly how much power I can extract out of the LS running between 10-12 psi. I am figuring with my port matched intake manifold, turbo ported head, open 3'' downpipe and my fuel system that I can pull 300whp out of the LS bone stock internals. With 300whp and 250 ft-lbs of torque at the wheels I should be deep into the 11's with slicks, right? I am still not sure if I will even attempt to try the twin charger, just an idea at this time, I just want to make sure that I can hit low 11's high 10's w/LS stock block in my gutted Eg CX hatch.