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It's a stock Ls3, I can't decide if I wanna go ahead and do cam first though,
End result would be 650whp ish, really just would like a very fast spooling setup, I've had turbo cars in the past and played with different turbo sizes, and a smaller fast spooling turbo is way more fun on the street than a laggier big turbo. Never messed with a rear mount setup before and there is limited info on 6spd cars with rear setups that I could find. Your's will be the closest setup to the one I'm going with even as far as I was going to go with the spinmonster cam if I did cam first.
I would wait on the cam and do a more turbo specific cam. As for turbo you can go with a faster spooling turbo over a s475 for those power goals.
Yea that is another thing I keep debating but for the price the BW are awesome units for the money, I'm eager to see how your setup spools so that I may judge which way I'd like to go.
looking good! I believe comp and a few others have special cams spec'd for rear mounts also that are supposed to help with spool a bit so that may be an option for the guy above too
Looking Good Are you losing any ground clearance running the cac pipes under the front? Any reason you couldn't go up through the engine bay and back down to the cooler?
Looking Good Are you losing any ground clearance running the cac pipes under the front? Any reason you couldn't go up through the engine bay and back down to the cooler?
Yes you can go through the bay but I'm not a fan of it visually. You can also go under the drivers manifold and next to the steering shaft but you'll have to remove the manifold to get the ic pipe in there which is a lot of work. I may go that route eventually if this has issues with ground clearance. Vengance has gone under the subframe with a few of their builds with good results
Been slacking lately due to my day job. Been out of town for work. I drove the car around the parking lot of my shop the other day. All that's left is mounting an iat in the intake manifold, finishing up my intake and filter mounts.
This is another project I'm working on as well. Stock rebuild 5.3 going in a fox with twin billet s366s and a th400
Ive been looking for a clean and reasonably priced notchback for a couple years now. Id like to do a 364ci with a single S480...
Yea that's the plan, gutted caged, already has a built 9", and 15-20psi. We were gonna do a single 80 like mine but decided to switch it up, since I've never built a Tt setup yet.
Yea that's the plan, gutted caged, already has a built 9", and 15-20psi. We were gonna do a single 80 like mine but decided to switch it up, since I've never built a Tt setup yet.
twin 366's is going to be sluggish on that 5.3. That's 1500 hp worth of air in those turbos. I'd look at 256's or 258's. How much power are you guys trying to make?
Just so you know. 100% VE is hard to get. That's like huge cam, intake, heads, etc... Looks like you guys have some of that. Stock VE is closer to 85%. As the VE drops the engine requires less air, ultimately making less power. So for instance, 100% VE 20 psi @ 7000 rpm = 106 lbs/hr (~1000 whp), 85% VE 20 psi @ 7000 rpm = 90 lbs/hr (~900 whp)
I also wasn't sure how high you're going to spin it, so I stopped at 7k
Here's a 5.3L twin mapped on a 366. It'll be doggy for sure. Not even on the map until after 3k.
Here's a 5.3L with a single 475 with 85% VE. Way better
Twin S256's on a 6.0L with 95% VE
Last edited by manifoldmike; 04-05-2015 at 01:19 AM.
twin 366's is going to be sluggish on that 5.3. That's 1500 hp worth of air in those turbos. I'd look at 256's or 258's. How much power are you guys trying to make?
Just so you know. 100% VE is hard to get. That's like huge cam, intake, heads, etc... Looks like you guys have some of that. Stock VE is closer to 85%. As the VE drops the engine requires less air, ultimately making less power. So for instance, 100% VE 20 psi @ 7000 rpm = 106 lbs/hr (~1000 whp), 85% VE 20 psi @ 7000 rpm = 90 lbs/hr (~900 whp)
I also wasn't sure how high you're going to spin it, so I stopped at 7k
Here's a 5.3L twin mapped on a 366. It'll be doggy for sure. Not even on the map until after 3k.
Here's a 5.3L with a single 475 with 85% VE. Way better
Twin S256's on a 6.0L with 95% VE
We put a lot of that into consideration when deciding turbos. With the th400 and 9" rear to make roughly 1000whp it'll be well over 1250crank. This is just on the stock motor. Well either end up building the 5.3 or go with a bigger 6.0 down the road. So the s366s are a little big now, on this motor but it's more for future plans instead of doing it twice.
Sorry for the lack of updates. I was out of the country for a week. I relocated the battery and took everything off the get coated and wrapped tonight. Should have it all back together by the weekend. Tell me what you think of the new exhaust
Agreed 256s would be better. Made 1100rwhp on an ls3 with s256s not even maxing them out.
You're comparing a manual car vs a stalled auto th400 with a 9" rear. Which has roughly a 25-30% drive train loss. Yes, I agree that the billet s366s are a little big, but at the price I get them for its worth it.
03-09-2015, 07:31 PM
Are you losing any ground clearance running the cac pipes under the front? Any reason you couldn't go up through the engine bay and back down to the cooler?
