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K4L4M1TY

BF to FG plenum conversion

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Hey all just looking for some advice on changing my BF XR6T plenum to an FG turbo one. So I just went through the fun of pulling my intake plenum off to sort out a couple of things around it and have pondered installing an FG one instead of putting the stock one back in.

 

My BF is completely stock and other than cosmetic issues it seems to be in good condition with good compression and is fairly clean for 180k kms. So from what I have looked at in the past the FG plenum is not only easier to work with/around, it's actually a good upgrade that's not too expensive compared to a full aftermarket plenum.

 

Doing the run through(knowing about injectors, fuel rail, etc) it looks like at the least I will need to get the plenum, harness adapter if I choose to run an FG throttle body, cold side piping. This then lead me to my stock intercooler. Other than obviously not being a good option I realised that the stock cooler piping would not be viable thus adding a new cooler(plaz most likely) to my list. After realising that I figured it's basically a complete piping system needed including hot side.

 

I was planning on doing battery relocation to the boot to get turbo side intake anyway so that's fine and after realising this hole I'm getting myself into, I thought it would also require a tune. To top that all off I also know there are a few other supporting mods I thought should probably be done at the same time ie: cat(maybe dump?), injectors and anything else small that I can't think of right now.

 

So after what I thought was not going to be much it seems I'm looking at a couple of grand if not more, which has brought me to the point of wondering if the plenum is worth it for me. I was just originally thinking of doing the PW throttle body relo to get rid of the crossover etc but realise with that alone I would be doing much the same thing just without the FG plenum. I'm looking to get a healthy 400kw and I know I'm not doing that without most of what I've already listed but am unsure on the extra cost of doing the plenum swap being worthwhile. Any thoughts or anything important I'm missing would be greatly appreciated, cheers.

Edited by K4L4M1TY

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if you're keeping it stock, you don't need the FG plenum... if you're modding it considerably (500+kW) then it's a good idea to start with the FG plenum... you say "a couple of grand", but it'll surely be a lot more than that to do the list of mods you have given, let alone the ones you haven't listed :)

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I plan on about 400kw with room to increase if it becomes a weekend car as it's a daily hack to build on currently and I don't do a lot of mileage. I do most of the work myself installation wise so that keeps cost down and not all of it will be new parts considering the amount of stuff out there these days, but by a couple grand I meant 'hopefully' around 3-4k. If it was a newer car or in better condition than it is cosmetically I would do it better but for what it is, I'm content doing it cheaper than with all new bling haha.

Edited by K4L4M1TY

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yeah; if you're super patient and get all of the required mods 2nd hand and do all of the labour yourself and basically only pay for a tune, it'll save you heaps, but it requires a lot of time and patience

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I have both thankfully, only thing that bums me out right now is it will be sitting there not running until I get it all and will be stuck riding and driving a Mazda 3 haha. I've got experience with modifying cars and such but never really done my own to this extent so I'm just stuck weighing up the pros and cons of doing the conversion as opposed to sticking with the stock plenum and seeing what I can do with it. Guess I'll just have to see where funds are at and think about it for a while, I read that there's multiple advantages of going the FG plenum so I'm keen on the idea and after dealing with pulling out the old B series one I'm kicking myself thinking about having to wrestle that thing back in now and any future modifications that might require me doing it all over again.

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You sound lazy-efficient like me, I loathe doing something tricky/time-consuming I know I'll have to re-do not far down the track....

As you pointed out though, you'll want to throw all those other mods at it to make the change worthwhile.

I would sit on it for now, put the stock plenum back on and give yourself a target of 3/6/9/12 months to get together funds, parts & a decent window of time to attack it all at once.

In the meantime, keep researching and tweaking your wishlist, and most importantly work out who is going to tune it and get their input as well.

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Albeit the ba manifold is crap, it's not a deal breaker until you start maxing out standard frame turbos. Then go plenum or FG inlet.

Pretty sure you need coolant lines as well.


Rapid wrap around piping is great for a man on a budget. Tb relo is not much of an upgrade in performance, only looks (personal opinion there).

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10 minutes ago, arronm said:

With a low budget FG plenum should be the last thing on your list. 

Not on a low budget, just wanting to spend less time with it apart now than have to spend the time doing it later and honestly find the b series plenum ugly and a pain to work around. All I'm really concerned about is the efficiency of the stock plenum if and when I decide enough isn't enough

 

1 hour ago, camo86T said:

You sound lazy-efficient like me, I loathe doing something tricky/time-consuming I know I'll have to re-do not far down the track....

As you pointed out though, you'll want to throw all those other mods at it to make the change worthwhile.

I would sit on it for now, put the stock plenum back on and give yourself a target of 3/6/9/12 months to get together funds, parts & a decent window of time to attack it all at once.

In the meantime, keep researching and tweaking your wishlist, and most importantly work out who is going to tune it and get their input as well.

Kinda like that though I don't mind doing it, but I loathe the amount of skin the car took from me doing it(I know, fun times). I've probably got 5k atleast to throw at it but really don't think I'll need that much. If my old work weren't so iffy I'd go there as the tuner is good with barras but from what I've seen jez do with them, dvs will probably do my tuning as he seems to take a lot more pride in his work. My problem is I see, I want, I get, but I do my research which is why I thought I should get advice from some of you here as I'm sure plenty have done it or looked into it at the least.

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How do you figure? I do all my own labour so it's parts and tuning. Seen plenty of cooler and piping kits for round 1500, plenum plus stock fuel setup 700ish, new pump 2-300 injectors 500, valve springs 300, tune 1000, fg tb adapter. What am I missing? Like I said it doesn't have to be and most likely wont be all brand new bling. Not to mention recouping a bit on the parts I take off and probably sell.

 

I understand zf probably won't be happy but I can worry about that if I want to keep the power down a bit to save it. Not sure what else would really be necessary.

Edited by K4L4M1TY

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Exhaust, turbo mods.  500 for injectors will buy junk. Do you reckon you can change valve springs?  Intake.? Surge tank? And that's just the start. 

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Dump is the only part I'd care about buying lol, 3582 can't get near 400kw without flapper mod? Yes I can change valve springs, intake is obvious since I just removed the plenum, don't need a surge tank really, my tank is always full. I can do all the labour myself, could probably rebuild the motor if I had the space and the tools.

Edited by K4L4M1TY

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Good to know a couple years holding off learning and seeing other cars and working for someone who's built monster barras has taught me nothing then mr negative. Cheers.

Edited by K4L4M1TY

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All good mate, I know the attitude, kind of why I left the shop I was working at which has built and tuned many barras including some record breaking cars in their time. I've been sitting on my hands watching and waiting for when I felt I should start down the rabbit hole. Plenty of builds out there and plenty of parts I could buy but don't necessarily feel I need them ie: oil pump gears which I hear is a big thing for limit bashers which I avoid plus I have a zf.

 

Seen parts all over the place at all different prices, I'm not one to  always buy and get burned buying rock bottom cheap stuff so I try to know who I'm buying from when it's used stuff and pay a fair price but god knows there's plenty of good wrecks out there with nice parts just waiting to be bought haha.

Edited by K4L4M1TY

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Absolutely no reason why you cant make a big jump in performance for less than $5k.

The FG intake is a neat setup, you don't necessarily need it but it is neater and works better.

By the sounds of it that's the way you want to go so I would say do it!

Always plenty of good parts for sale from people doing another round of upgrades so keep your eyes out on Facebook groups, etc.

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FG plenum is worth doing, you need the get an FG turbo water/heater pipe from the thermostat housing to the back of the motor. I used the plazmaman hot and cold side piping for the stock ba manifold and modified it to fit the fg setup. Get a plazmaman fuel rail while you're going.

Only thing annoying is it stretches the standard b series wiring for the injectors a little.

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I would keep the stock fuel rail, just install a gfb fuel regulator and your good to put a fairly substantial pump behind it. standard regulators dont like large pumps.

 

ive installed fg manifolds on both my barras simply because I hate the placement of the tb on the b series ones. fg ones are easier to make pipework for, neater looking and easier to maintenance.

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I got a FG plenum for next to nothing and installed on my BF.  Instead of changing thermo I cut the end of plenum and rewelded to have clearance, also welded up throttle body holes and redid them for BF body.

20170904_142401.jpg

20170904_144805.jpg

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27 minutes ago, samhouston said:

I personally don’t see the sense in this, when you can change to a forward facing plenum for virtually the same cost 

I've not seen one for anywhere near the price of a fg one. Most I see are twice the price or more(though the PW one looks sweet).

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