turbo's - sc36 or sc40
 

hi guys,
right time is almost here and my mock up engine is nearly completed so its time to choose a turbo,

ive been speaking to my mapper and narrowed it down to 2 - sc36-40.

anyone here ever/is using these turbos as i need your help in which to choose,

the setup i got now is too laggy for me, or do i got external wastegate??

no bull**** answers as ive got 2 weeks to order one.

thanks

What engine and internals have you had done and what car is it going into. Also what gearbox?

I've got an SC38.
I find it a bit laggy on the road, but on trackdays it is no problem

right ok, can you explain how laggy?:thumb:

got a 2.0 sti bug with supporting mods

I had a good chat with the clinic about this.

Final question, is it for the track or just the road?

its my main everyday car and will be used for fun trackdays and local hillclimbs lol

Well..... Coming from the Clinic. They have a V4 type R with a 2.5 sti lump in it. They've put a SC36 on it and absolutely love it.

They said that, on the road it's awesome and pulls easily away from the "track day monsters".

However, on a track it's a different kettle of fish. I don't know if this helps really but if it's an "every day car" i think i'd be swaying towards the sc36. I'd rather loose producing 360ish and have a good excuse and oppose to the opposite :)

To note the SC36, they've produced a lot more out it than 360.....

my mapper told me to go for the sc36 as hes mapper one over 370.

been looking at every thread about these turbos, ive been told it will spool as fast as a vf35 but meaner. which sounds like a good turbo.

there is a part in my brain telling me to go for more power and to get the figure 400 on the graph.

i just dont know, there are a lot of excellent reviews on the sc36 but not many on the sc38 as thats an option aswell

Why not an sc42?

That would be your testicles talking, don't worry, it happens to the very best of us :)

You're talking about £1k +for the turbo fitted plus mapping etc .....

Worst case scenario = Two tanks of fuel £140, a night at a travel inn £60 + a day of car porn.

What i mean is..... Give the clinic a call and ask to go and see them and have a guided tour. Explain your dilemma and they may even be able to show you the differences.

£200 could be a massive saving on making and replacing the wrong choice. Obviously all IMO.

I would guess it would give me too much lag so it will be exactly what i got now

I'm told that the sc42 isn't that laggy compared to some td05 20g's due to the bearings and billet wheels. As said above your probably best speaking to Clinic and see what they say :)

I just found I got more immediate power delivery with the original turbo - VF43 I think. Slightly earlier in the revs as well.
How laggy? Hard to quantify - I would guess between a half and one second to fully boost, with not much going on below 3000 rpm in lower gears, but you'd really have to test back to back. I tend to notice most when I go to overtake (now needs a bit more "planning") or when cruising at 3000 rpm in top gear and I put my foot down - tend to drop it down a gear or two these days, where I didn't before.
Anything is a compromise.
When I look at some of the power graphs shown on this site, I think, why bother with boost so high up the rev range? I am guessing must be rather laggy as well.
That said, I do about 15,000 miles a year in mine and track it a half dozen times a year, so don't really want to be changing down or building up boost to overtake.
My personal advice would be go down the SC36 route if mainly used on the road and you are not chasing numbers.
Having said that, I agree 100% with the others on here - have a chat with the guys at Scoobyclinic.
You know it makes sense!

I have a nice MDX555 Billet for sale!

i have an sc38 billet and it is in no way laggy, mapped by simon to 390bhp on vpower.

think it makes a full bar of boost before 3000rpm. excellent turbo, on standard injectors aswell.

sc38 id say as im not sure they done as much with the sc40 think its just a billeted td20g were as the 38 has a better design if i remember rightly.

All turbos have lag. It is just that some aren't as bad as others.
Mine is also mapped by JGM, so I guess whatever opinion we have is subjective to our own circumstances/experiences.
As a comparison, how do you find the SC38 compares with the original one and what type was that?

I previously had an APS SR40 which was extremely laggy (notoriously laggy - 1 bar not until 4300 rpm or something silly), I have however driven a 2004 sti with a VF35 and it really did not feel any quicker to spool then the SC38, the SC38 obviously has more power aswell.

If you have a decent set of headers and upipe this will also help, I got H+S EL headers and a H+S matched upipe which improves spool massively.

Hi there

If you are looking for quick spool I would go down the route SC36,but still worth the consider SC38 too

Jura

just looking over things, what about going rotated?? :D

with something like sc38, gt30?

Going rotated with SC38 is pointless,you will not gain too much which will justify the amount the money

With GT30 on 2.0L without the AVCS,you will have laggy car and really its not the worth

Best turbo for WRX is like VF34,SC36/38 or MD321H(MDX-555/400)


Jura

I run a rotated s206. And it is brilliant, things start going on at 3k so over taking no issue.

To be honest if you have lag you are in the wrong gear. Just drop it a couple of cogs it won't be laggy then!

ive got a blob sti engine in mine with working avcs heads jura :D

I got a sc40 on a Sti v3 type r not laggy at all but I got Harvey's trick up pipe and gt spec 2 headers . If I was you 100 % sc42 as said before the spool is really good for that size turbo it's minimal difference to sc40. If you got a 38 or 36 you will always wish I had 42

This is bang on the money, if you are in the right gear you won't get any noticeable lag;) no matter what turbo you get unless you learn how to drive with regards to right gearing and revs when needed you will get some lag, especially using 6th gear at 40-60mph cruise speed.


What are you future plans with power ie would you like to reach 400+?

Go twinscroll :D

Lm450 on standard engine, full boost @1.8 bar at a little over 3200rpm, spools just as quick as my standard vf35 did, considering its a big(ish) ass turbo it dun half pull well from low down in the revs, starts to make boost at 1500rpm ish and quickly pulls its way through revs, I personally think its great, bit of a shoot out between power vs lag, but can honesty say that this is a good compromise, if I wanted earlier spool could drop to an lm400 which is on song by 2800rpm ish, just a thought :D

+1 - If you are cruising along at 4000 rpm, lag is not generally an issue.
I do like the idea of doing 70 mph in top gear and just being able to boot it. With 2.5 STI (JGM mapped) VF43, this area of performance was pretty reasonable - with the SC38, it is a matter of dropping down to 4th gear.

I had the sc36 on a 2.1. It was boring, as there was no shove in the back, as it came on boost so early. Even a td05-16g on a 2.0 is much more amusing to drive IMO, even though it makes less power, due to the power delivery.

You are probably forget,UK AVCS heads are totally different(bigger ports,better cams are in JDM) from yours what you are have,due this I would twice rethink about the going twin scroll

SC42 or SC40 will spool nicely on 2.0L with AVCS,if not above Matt selling nice MDX-555/400 which is very similar to the MDX321H

Jura