Will it help to add hp on F.I. cars to get a bigger sized throttle body, and port out the intake manifold or is that not a good idea?
it cant hurt…
Porting out your intake isn’t that great of an idea, you will only create more “lag” feeling. You see when you increase the volume within the manifold, the turbo now work harder inorder to fill that area.
Think of it like this: If the your turbo outlet (on the compressor side) is 1.5" diameter and you run 3" diameter intercooler piping, the turbo has to fill in that extra amount of space before you feel any boost, creating more of a “lag” feel. In this case, it would be much better to run 1.5" to 2" diameter piping.
So, porting may not be the answer, but polishing would definetly help.
why is everyone such lag bitches these days? you have a FWD car, LAG IS YOUR FRIEND. Without it you’d be breakin’ axles and smoking tires no matter what. What people don’t realize is lag is not an issue in a race. What you give in lag you take in ass loads of top end power.
CRXGSR- No flame intended bro, but your statement is false in this case. I have a B18A motor with 2 1/2 inch intercooler piping going through a bored out throttlebody (stock) in a Skunk2 intake manifold. The Skunk 2 manifold is basically a ported and polished TypeR replica thats way bigger then the stock intake but makes a huge difference. The lag your speaking of comes from 2 things:
- low compression
2)too many bends in your intercooler piping
Ported and polishing if done right by someone who knows what they are doing can only benifit a forced induction application. Its forced induction, the air is going to get there regardless if its ported or not. Porting is a very good idea with turbo cars. I don’t mean hogging out the ports. But porting out the ruff factory abbrations in the manifold (less turbulence) then polishing it for a smooth transition throughout. Hope this helps.
Formz TSi- lag will never be my friend. Good tuning and driving skills conpensate where a heavy gaspedal foot doesn’t. 9 times outta 10, if you pull up beside someone on the street while cruising in 2 nd gear and hit it. You don’t want that lag. Because as the good old saying goes, if you follow you swallow.
Thats where you seperate good drivers from bad ones (not speaking of you particularly but just in general).
But think about, what would you rather have:
(this is assuming traction isnt a problem)
a turbo that spools instantly, but can only support 250hp
or a turbo that spools maybe 700rpm slower, but can support 500
By the time the person with the smaller turbo is MAYBE a car ahead of you, your turbo gets full spool and walk him like he’s standing still.
But think about, what would you rather have:
(this is assuming traction isnt a problem)
a turbo that spools instantly, but can only support 250hp
or a turbo that spools maybe 700rpm slower, but can support 500
By the time the person with the smaller turbo is MAYBE a car ahead of you, your turbo gets full spool and walk him
like he's standing still.
Very true. But what if you don’t have enough to catch him. I think its a personal perference on what you want. I am not disagreeing with you, I just perfer instant response. That way I am utilizing my whole rpm band and not just the top end of every gear. example: If I kick down on my car at 3500rpm and go without lagging. I am using more of my powerband as opposed to kick down at 3500rpm and waiting for 5000or 5500rpm for it to spool. A easy solution to this is to buy the turbo you want (like the 500hp one you were talking about) and putting a smaller exhaust housing on it so you can enjoy the best of both worlds (kinda like LS/VTEC)
oh oh oops… i should of mentioned something. I wasnt talking about turbos that spool till 5000rpm or so. Those I’d call full out drag turbos. I’m thinking turbos that spool up between 3500-4200rpm. Those are streetable turbos with very real power. And with the GT Ballistic series dual BB turbos, they can support massive amounts of hp without sacrificing lag by a lot. The problem (as you know) with smaller turbos is they run out of steam higher up in the RPM band.
Ok I get ya bro. Some of those new roller bearing turbos spool really fast too. I had a PT70 on my Buick then put on a roller bearing PT76 and I got less lag with a bigger turbo and pulls way harder throughout my whole powerband. I also hear Innovative turbos have got a new version of dual roller bearing turbos out that they have patined with next to no lag at all. Technology thats out there now a days is incredible. Skies the limit.
sky is the limit? sounds like we’re talking about prices now! ouch!!
Thanks everyone for the feedback, i thought it would benefit f.i but i wasnt sure so i just figures i go out on a limb and find out so thanks to all for clearing this up for me!