The one thing I'm wondering about is the systemax being able to keep building power up to that range. I have a feeling that the powerband will flatten out in the 6-6800 range. For example let's say you see 500rwhp @6200and that may stay relatively flat maybe 520@66/6800. With a single plane/elbow system I would imagine your peak will be higher and still climb towards the top of the curve. Now if you're wanting to make max power/drag car/etc I definetly think the proper way would be a different intake than the systemax. Maybe a box r or a single plane/elbow(super Vic efi or equivalent). If you really plan to just occasionally make a trip to the track and enjoy the crap out of it on the street the Holley will work great.
Either will get the job done, systemax is a better choice. You will see fuel distribution problems with a spider type intake... How do I know that? 20% fuel correction on most of the cars with imported spider intakes that use an elbo... I have almost 800$ worth of welding and port work into my intake just to get it "right"
Box intake will.kill some tq but will make more HP . ported systemax will support 8000+rpms and 1000 HP all day long. Look at the old school renegade cars! That was the baller intake to have
I've always wondered about that. I'm going to portmatch mine. I think I might send it to T Moss later. Where do you think the most gains are made from? Porting the lower or upper/both? Loosing a little down low for a 363/blower on the street wouldn't be a bad thing imo. I know the opening is slightly smaller than my 75mm accufab and I'm going to clean that up also.
When you say "imported" which ones are we talking about? Because when I go dart block, my plan was to lose the rpm II and go with an efi victor with an elbow.. Please enlighten me.
EDIT: I have access to a nice heli-arc rig, if I need to do welding to one, where?
Port matching is one thing, don't get me wrong that will help but is no replacement for serious porting. These two are vastly different. You will see more gains in porting the lower than the upper with the systemax. The throttle body opening should be port matched to your T/B size as well.
When I say "imported" I'm referring to the Chinese knock off brands. These have less quality control and even more poorly constructed (casting flash ect) when it comes to the name brand stuff. With that being said, any boosted car with an elbow on top of a spyder type intake will have fuel distribution issues( I use a super victor fwiw). The runner lengths are vastly different in the corners and see less air flow. depending on the direction of the elbow you can see the distribution issues move around. When it comes to fixing something like this it isn't something that anyone in there back yard is going to be proficient at. I do 100% of all of my fab work and welding but porting the intake on my car is something that I won't even attempt. Tommy Slowko is who has my intake now fixing the distribution issue. Porting in the runners alone is not enough in my case to fix the issue... They are welding on the dividers and adding material to the floor of the plenum as well as flow testing everything once that process is all said and done. To get even EGT's and good plugs across the motor I've had as much as 25% fuel out of the corners on my motor (this is insanity) to the point where the car would run great WOT but would have issues idling with no real happy medium. ( these are the things that no one talks about and even fewer people will work with you on, welcome to making big HP )
A throttle body helps but does not fix the problem, once the plenum is full of air (under boost) you still have the differing runner lengths and similar distribution problems. Again, these are unique problems to boosted applications. Where the 4150 throttle body helps some, there is the challenge to getting the air into that throttle body. Currently the extreme velocity hat is the best solution but the combination of that and the throttle body create more restriction than an elbow and 105mm throttle body lets say. It's a toss up and in most cases I am talking about the extreme end of things here.