Porting; how much difference?

[Justin14100]

ive never had the experience of running a ported / non ported charger to feel the difference, but surely just removing material from the casings will make minimal difference as its still only compressing the same amount of air going in?

also, got a photo of when i was servicing my charger, to where the arrows are pointing, there seems to be a random large piece sticking out, seen some others dont have this - wouldnt this upset the airflow a lot? Was an R1 done in 2002

im sure porting is quite a complex thing but i can see it making a huge difference (a 500 pound difference?)

[Alexiskayak_7]

If you grind more the left arrow piece you will destroy your g lader. The oil supply (i think) line passes from that piece...

[Justin14100]

If you grind more the left arrow piece you will destroy your g lader. The oil supply (i think) line passes from that piece...

I dont mean the thicker arm to the bearing, i mean the thing that sticks out on both sides (each arrow points to it)


thats what i mean

[Richg40]

It's all about flow baby and resistance to it. Charger might well be creating power but it also saps some in the process. The way i figure it is getting air in and out with the minimal amount of fuss can only help regain a little of that lost power.

Tell you what though, that's quite a tidy job. And those pointy bits,  i've some with and some without. I guess you'd have to ask the man at Jabba.

[hayesey]

the difference between a standard rebuild and an r1 isn't £500 is it?!?!?

[Richg40]

Didn't it used to 165 beans extra for the porting over a standard rebuild?

[Justin14100]

the difference between a standard rebuild and an r1 isn't £500 is it?!?!?

service your own = 180ish with pete's parts?
R1 is £495 + £123 for the induction kit that is 'required' with an r1 now! edit again. its it still says required with an R1 rebuild.

so anyway £450 difference?

[hayesey]

that's not a fair comparison though, you are paying for jabbasport's time to do the actual service too, need to compare jabbasport's price for a service and price for an r1 which is more like £150-ish like Rich said. 

I think porting does make a small difference, not a big one but it helps reap the benefits of using a smaller pulley.  It's not worth £500 but it doesn't cost £500.

[PeteG40]

you get an additional 0.2 bar from a none ported to ported (with a 65mm pulley) which is 25% increase. Though i wouldnt like to say where the main restrictions are - on the outlet or the casting marks - on the shallow part of the charger.

Those two circled parts are just jabbas porting style.  You can port it yourself, but i dont like doing it.  One slip and its byebye.

Yeah - psd used tocharge about £150 over a standard rebuild, but you only pay once.

[Justin14100]

25%? seems like quite a lot. just wondered what the difference actually was.

good point with the costs. half a k is either way is a lot of money.

Thanks guys. just wondered!

[Puncharado]

Like a lot of other people I expect, I went from a standard engine to an R1 charger, 65mm pulley, and chip (engine otherwise still standard). The difference in performance was certainly noticable!

[hardchargin40]

They kept certain bits alone for strength and reliability.  Brian told me he left it alone generally to maintain strength to the oil line to the bearing.  Plus its all a factor of time porting and what to charge etc.  To start porting and smoothing aerodynamically to a fine degree can take time for small gains, such as extreme knife edging etc.

Steve used to spend alot more time porting PSD chargers than Brian did, but again its down to productivity, time, efficiency, money, etc.  Steve undercut Jabba in prices but then he'd spend more time doing them, therefore overall lose time and gross profit. 

I assume you seen some RS2 chargers where they've taken away 3 of the support legs to the centre bearing.