SC46 will see how laggy it is ,but from what I've read and seen it spools up very well.

Immy

My mate has a 46 on his forged 2.0ltr P1 and it spools up nicley.;)

^ but not as nice as the 42 billet will spool on yours glen.

You'v deffo made the right choice,forget about pub talk/how fast it looks in numbers on a dyno pal,its all about how it pulls out of corners on the ROAD.

And we will see soon how well another 2.1/GT30 billet spools/performs.
Cheers kev/scoobyclinic.

Kev, i know you have an epic thread going, full of graphs and results but yet people keep asking about the turbo or results you dont yet have:Whatever_, so apologies if this pisses the hell out of you mate:D,
But before you mentioned an SC46 with Bigger wheel, did you ever do anymore on this or try one??

Hay pete ...
Mine hits 1 bar nice and early on a sc46 Thankyou very much lol

Hi,

as far as I am aware I have never mentioned a bigger 46 Billet wheel only a bigger exhaust housing, these are now in stock. :thumb:

cheers
Kev

When is the billet SC42 likely to be in stock, Twinscroll that is?

Thanks, Gaz.

Yours has avcs mick.

Hi,

as stated many times before the problem with the twin scroll billets is we need the old exhaust housings back so we can machine them and go again, this is a bit messy as most people want to keep their old turbo complete. :(

I had six housings originally which I could rotate and therefore keep a few on the shelf, problem is they have now all gone so until I get my hands on some I am stuck. :brickwall

However, there maybe light at the end of the tunnel, we are about to test an SC36 Billet twin scroll, if this works the housing used is a custom cast one we can purchase in bulk as a blank, the good thing is its machinable up to an SC46 exhaust wheel so that may be the answer. :thumb:

Meanwhile send me your old exhaust housing and we can make an SC42 twin scroll for you straight away. :D

Cheers

Kev

Kev is that 46 ready to go? ;)

Thanks for that Kev, I have read so many pages of this thread but couldn`t find a definitive answer regarding the twinscroll, I would love to send you my exhaust housing but i need the use of my car so i will have to get a complete one when things are sorted, Once again thanks for your help, Gaz.

Hi,

yes, was awaiting your call, sorry been that busy it slipped my mind. :thumb:

Give us a shout and will will despatch it straight away.

cheers
Kev

Sorry Kev i ment to say bigger housing:sleep:
Have you had a chance to test any of them or sell any yet:wonder:, interested to know what extra power it made and what difference was to spool over standard sc46...

I went through the same dilemma myself. I wanted to retain TMIC and was shooting for ~420hp. I went for the 46 in the end for the following reasons:

• Proven turbo with plenty of graphs
• Future proof for when I decide ~420 is not enough!
• Probably marginal later spool than an SC42, so I can deal with ~200 rpm.
• Bigger turbo than SC42, so in theory should be able to run less boost than SC42 to achieve same BHP = lower intake temps (think TMIC).

However, I'm by no means a turbo expert so please don't treat me as one :-)

By the way, I'm loving the SC46 on my 08 STI hatch, it's still on a running in map and it puts a grin on my face @ just 1.0bar!

HTH

Well ive decided on the SC42 as in theory it should give me the same performance as the SC46 but with better spool,well thats what im hoping for anyway.The car will be mapped at the same time as my mates car who has the SC46 fitted,both cars are 2.0ltr with similar mods and capable of running high boost so it will be interesting to see how they match up against each other on the day.;)

The OE TMIC will struggle at 450 bhp and I would be interested to know what ACTs you are seeing at that power level. It may be OK on short bursts but from what we have done it certainly struggles on anything like a serious cross country drive.

If they make the same power mate but your spools better the 46 will be coming off!!!!!!

Hi,

just a quick update before confusion sets in. :wonder:

Please do not mix up the single scroll units with the twin scroll ones, they are not the same animal. ;)

When I update the thread with results on billet 46 turbo's or Billet 42 ones I am always referring to the single scroll units, if we happen to do the odd twin scroll I will state "twin scroll" after the turbo's part number. :thumb:

Have to mention also that there are a few spurious figures appearing on top mounts, its my experience that 380 BHP is pushing it on the STI top mount, although I did run 450BHP for 3 years on an up rated hyperflow TMIC but it was only used for short sprints and shortish blasts, as Harvey states earlier on this thread it wouldn't last on a spirited cross country drive or a circuit race for sure. :eek:

cheers
Kev

white wagon when are you getting the 42 fitted and mapped as im so need to see your graphs dude

Fitted this monday but not mapped until the 16th september when jgm gets his hands on it,looking forward to seeeing the results myself,my car has every possible supporting mod so it should be positively rocket propelled and not to be sniffed at.:thumb::lol1:

I'm running a 46 on an STI TMIC and it drive superb, got avci heads though but an absolutle animal on the spool.

Good look glen
It's ages away that though mate

sound good dude i look forward to hearing your results as im very keen on this sc42 if it can hit a good 400 to 410 and spool well then ill be having one of them, i take it your a 2.0 engine forged with the usall mods to go with it dude

If past results on my car are anything to go by then it should easily see over 400,last turbo was a harvey smith ported 18g which made 385bhp,previous to that was a vf28 which made 363bhp both on vpower.I`ve fitted a jdm sti 8 twinscroll bottom end which seem to be happy at well over 450bhp so good things should come from the 42 when JGM is let loose on her next month,fingers crossed.;)

I seem to remember on the road in "normal" road use it was quite a lively combo tho ;) Most people tended to run out of brave pills on the road...

I've had one customer run a MY05 spec c with 450 and 500bhp with Nos for the past few years on the standard JDM engine with top mount and it's never missed a beat. the car ran in the MLR sprint for two years in a row and he tracked it.

SC42 billet Twinscroll!!! Pics and info below

https://www.scoobynet.com/scoobynet-...l#post10199072

Help...
 

Hi

I am picking up a DEI turbo blanket from the states for SC46 what size do I buy ?

T3, T25/28, T4, or T6 ?

Thanks

A

Immy you been on the crack pipe again! :D

Rob was using a FMIC. :p

Agh sh@t you know I love my crack, I was under the impression he was running a top mount. :D
Are you going front mount when you change turbo?

Immy