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SC42 or 46 on newage STI block?
I'm going yo be having a newage short block fitted soon, I was going to go for a sc42 but was wondering if it would be worth going for the 46, keeping in mind it could also be used for a further down the line bigger build.
Would it be too laggy, I'm going to be using my uk2000 heads for now. What are your thoughts guys? |
sc46 with a std 8cm exhaust housing will be too laggy on a 2.0l
you need a 7cm exh housing and ported headers with maybe a Harvey smith trick up pipe for decent spool, the 46 is more suited to a 2.5 |
wot e sed
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I have gone for the billet SC42 which was on Fuds old spec-c it has the SC46 billet front wheel fitted on it I believe giving more power higher in the rpm than the standard billet SC42 but with the SC42 rear wheel and housing it still has the same spool up as a standard SC42 admittedly this was on a 2.1 but as this is fitted on my spec-c 2ltr engine that will rev to 8 plus a few other bits to help it on its way should be ok.
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Yup, I thought as much, I guess the 42 will be an easy sale come upgrade time anyway. :)
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Does this go the same for my 2003 blob sti uk. I want to upgrade turbo for 400bhp. Which would have best spool. ??
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By the way what kind of boost will be required to achieve the stated 420 BHP on the SC42?
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Originally Posted by SmurfyBhoy
(Post 11479831)
Does this go the same for my 2003 blob sti uk. I want to upgrade turbo for 400bhp. Which would have best spool. ??
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Yea so what boost would sc38 be at to give 400 ?? Supporting mods required i guess. Fuel pump. Fmic. Decat. ??
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The clue is in the number of the turbo, 38 so you'd be looking at circa 380bhp not 400 but it would probably do 400+ with a splash of meth if that particular number really matters to you.
You mentioned spool so that's why I said go with the billet SC38, you'll be as near as makes no difference number wise but with much quicker spool, so will be able to keep it on song lower down in the rev range but still have a very decent pull to the point of max power at about 6.5k rpm. As for the amount of boost you'll be running, that's something you'll find out on the day you map it, as it will depend on what the mapper hears through his det cans and your spec. I notice your in Glasgow, so Braveheart sti is your turbo man and Andy Forest is your mapper, you lucky bugger.:cool: |
Right I'm going to throw a spanner in the works. Not many people have run an billet sc46 on a 2.0 but I have. This was even a conversation I had with Matty at mb developments who helped fud with his car.
The 46 was absolutely ballistic and was touching 500 with a dash of meth on a jdm 2.0 engine with matching jdm heads. The 46 have a lot better punch than the 42. They are worlds apart in how they perform. The 46 was ballistic all the way to the redline with no drop off and more than made up for any additional lag over the 42. |
cookie, give clinic a bell direct mate and have a chat about application. As suggested above 42 will prob be better on the 2.0, but they have the new SC42+ which is seeing some good results.
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Originally Posted by birchy2010
(Post 11479895)
Right I'm going to throw a spanner in the works. Not many people have run an billet sc46 on a 2.0 but I have. This was even a conversation I had with Matty at mb developments who helped fud with his car.
The 46 was absolutely ballistic and was touching 500 with a dash of meth on a jdm 2.0 engine with matching jdm heads. The 46 have a lot better punch than the 42. They are worlds apart in how they perform. The 46 was ballistic all the way to the redline with no drop off and more than made up for any additional lag over the 42. got a graph to see spool etc matey? |
Would the 46 be pushing a stock uk 2.0 too far ? All depends on boost levels of course. Im guessing jdm engines can take a little more ??
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Originally Posted by Tidgy
(Post 11479921)
cookie, give clinic a bell direct mate and have a chat about application. As suggested above 42 will prob be better on the 2.0, but they have the new SC42+ which is seeing some good results.
Will do matey, what the difference with the + now! I tried reading the billet thread,but one of my eyes fell out after about 100 pages. :D |
Originally Posted by birchy2010
(Post 11479895)
Right I'm going to throw a spanner in the works. Not many people have run an billet sc46 on a 2.0 but I have. This was even a conversation I had with Matty at mb developments who helped fud with his car.
The 46 was absolutely ballistic and was touching 500 with a dash of meth on a jdm 2.0 engine with matching jdm heads. The 46 have a lot better punch than the 42. They are worlds apart in how they perform. The 46 was ballistic all the way to the redline with no drop off and more than made up for any additional lag over the 42. Good to hear, again what boost is required? As I'm of the understanding ecutek can only run 1.5 ish bar. And this is the ECU I'll be running until funds allow otherwise. |
Originally Posted by birchy2010
(Post 11479895)
Right I'm going to throw a spanner in the works. Not many people have run an billet sc46 on a 2.0 but I have. This was even a conversation I had with Matty at mb developments who helped fud with his car.
The 46 was absolutely ballistic and was touching 500 with a dash of meth on a jdm 2.0 engine with matching jdm heads. The 46 have a lot better punch than the 42. They are worlds apart in how they perform. The 46 was ballistic all the way to the redline with no drop off and more than made up for any additional lag over the 42. The opinions of those who recommend the 38 over the 42, or 42 over the 46, have to be treated with caution. How many have tried all three on the same 2ltr car? My guess is very few so the others are relying on hearsay not actual experience. Humble apologies to those who actually have tried all three but the rest should prefix their comments with 'I hear that'..... ;) |
Originally Posted by Paben
(Post 11479949)
As above I have a billet SC46 on my 2ltr Bug. I have no idea how the car might have gone with an SC38 or 42, never having had either fitted, but I can state that the 46 makes for a very fast car, with minimal lag. If the car is driven like a diesel, using high gears and low revs, then of course it's laggy. But engage the right gear (3k rpm will do it) and it just takes off like a rocket and gets stronger and stronger all the way to the red line. My turbo progression was TD05 20g (OK but nothing special), a S/H MD321T non billet (much better until a bearing collapsed) but the billet 46 is in an entirely different league.
The opinions of those who recommend the 38 over the 42, or 42 over the 46, have to be treated with caution. How many have tried all three on the same 2ltr car? My guess is very few so the others are relying on hearsay not actual experience. Humble apologies to those who actually have tried all three but the rest should prefix their comments with 'I hear that'..... ;) Really nice to hear form an actual user of the turbo in question. What power/boost etc are you running? |
Are these all stock not forged 2.0 sti engines tht the 38 42 and 46 are used on ??
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Originally Posted by cookstar
(Post 11479955)
Really nice to hear form an actual user of the turbo in question.
What power/boost etc are you running? |
Originally Posted by SmurfyBhoy
(Post 11479960)
Are these all stock not forged 2.0 sti engines tht the 38 42 and 46 are used on ??
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Originally Posted by Paben
(Post 11479964)
Without getting into a 'mine is bigger than yours' exchange suffice to say it's running very well over 400bhp, max boost 1.6 bar, and still using the standard ECU and Maf. It will doodle along quite happily at 30mph in 4th and pull strongly from 70mph in 6th. Maybe quite a lot of urban myths busted there!
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Originally Posted by birchy2010
(Post 11479895)
Right I'm going to throw a spanner in the works. Not many people have run an billet sc46 on a 2.0 but I have. This was even a conversation I had with Matty at mb developments who helped fud with his car.
The 46 was absolutely ballistic and was touching 500 with a dash of meth on a jdm 2.0 engine with matching jdm heads. The 46 have a lot better punch than the 42. They are worlds apart in how they perform. The 46 was ballistic all the way to the redline with no drop off and more than made up for any additional lag over the 42. |
Originally Posted by cookstar
(Post 11479945)
Will do matey, what the difference with the + now! I tried reading the billet thread,but one of my eyes fell out after about 100 pages. :D
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Mines due to get mapped today @ 3pm, going for 1.6 bar on a 2.0L v9 sti short engine and v3 sti heads, simtek, hrc 340 fuel pump, 740cc infectors, hdi gt spec 2 fmi, ported headers, Harvey smith trick up pipe and a SC46 (non billet) with 7cm exhaust housing - looking for 420ish (maybe more??)
its currently running 1.45 bar of boost with the same set up apart from the injectors (currently 550's) and its a beast at approx. 400bhp getting it rolling roaded tomorrow so should be interesting |
Mine was stock jdm so nitrade crank. Avcs heads helped along with the gt headers etc. Was using a simtek feeding a fpr behind some 800cc injectors and 20% meth.
Was also a billet 46. Mine was fine until it ran too hot with too much anti lag on a 30degree plus day at Shakespeare and cracked two pistons but it was on meth too at the time. |
cookstar,
If you set-up is 2ltr without AVCS heads, stay with the smallest turbo to achieve your goal. The SC42 is a good fit. I personally run a LM450 Billet which is similar to a SC46 size wise, on a Newage 2ltr with AVCS jap heads. I personally wouldn't want to run this size turbo without AVCS. |
To the OP, remember that how a turbo performs on a certain car, is no guarantee that it would be performing the same on a similar but slightly different car.
Also one persons ballistic from 3k is another's lag monster. At this point you just have to make as informed a decision as you can and to a certain extent hope that it works out as you hope. |
I'm building the car with track and 1/4 mile in mind more than day to day road use, so if it's a bit laggy it won't be too much of an issue. I'd trade a bit of lag for a much bigger kick in the back. :D
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Well after a chat with Scoobyclinic, I have decided to opt for the SC42. It seems these turbos hold their values pretty well so upgrading it in future should be easy enough when the time comes.
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