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Sc36 vs a vf35

Old 13 June 2019, 10:46 PM
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Jonnylk prodrive
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Default Sc36 vs a vf35

I currently running standard car . I have sti topmount and pink injectors and a 225 pump and a full 3inc exhust system to go on the car and pannel filter. I can't dicide on wat turbo to get tho . I dont want a laggy turbo . I thinking a vf35 or a sc36 cause later on I'll be building it and I'll be fit to turn up the sc36. . Any one have a idea on spool time or when you have full boost. On each turbo with these mods? My car atm is wrx ppp pack tdo4 as standard I guess. The td04 has me spoiled with no lag 😂
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Old 14 June 2019, 09:33 AM
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What year car? Is it a 2.0 or a 2.5 engine?

As your car is a WRX when you upgrade to either of these turbos you get to the point of gearbox failure. The Hawkeye 06-07 WRX 5 speed gearbox is much stronger than the older 2.0L engine versions so will cope with 400bhp and similar torque, but the older gearboxes won't last too long at 350bhp which will be your target on both of those turbos realistically.

Rather than going down the SC36 route, why don't you contact a turbo builder like Craig Belworthy at Central Turbos who can provide you with a fully rebuilt turbo with a billet compressor wheel conversion for 550.

If 2.0L engine then I's suggest billet VF35 and if 2.5 later engine than I'd suggest billet VF48 turbo.

With the 2.5 engines, once you raise the boost there is a very realistic chance the head gaskets will let go or you'll promote the ringland failure issue and you'll need a full rebuild. So be careful, you have been warned!
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Old 14 June 2019, 10:42 AM
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Jonnylk prodrive
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Originally Posted by BrownPantsRacing View Post
What year car? Is it a 2.0 or a 2.5 engine?

As your car is a WRX when you upgrade to either of these turbos you get to the point of gearbox failure. The Hawkeye 06-07 WRX 5 speed gearbox is much stronger than the older 2.0L engine versions so will cope with 400bhp and similar torque, but the older gearboxes won't last too long at 350bhp which will be your target on both of those turbos realistically.

Rather than going down the SC36 route, why don't you contact a turbo builder like Craig Belworthy at Central Turbos who can provide you with a fully rebuilt turbo with a billet compressor wheel conversion for 550.

If 2.0L engine then I's suggest billet VF35 and if 2.5 later engine than I'd suggest billet VF48 turbo.

With the 2.5 engines, once you raise the boost there is a very realistic chance the head gaskets will let go or you'll promote the ringland failure issue and you'll need a full rebuild. So be careful, you have been warned!
Cheers for the info . Yeah it's a 2.0.
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Old 14 June 2019, 11:04 AM
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Originally Posted by Jonnylk prodrive View Post
Cheers for the info . Yeah it's a 2.0.
In which case I'd stick with a standard VF35 for now or maybe a hybrid TD04 turbo and try to be a little sympathetic with your gearbox.
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Old 14 June 2019, 01:37 PM
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If you are looking for a VF35 turbo I have one forsale in excellent condition. Good strong boost from the turbo.
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Old 14 June 2019, 04:02 PM
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I recently swapped from a TD0516G to the SC36 for my MY 05 WRX , in my view the SC36 develops torque earlier than the TD0516G of course if you are used to a TD04 then you will not have quiet the same response , but it is a good step up.

Brown pants has this all leveled for a gear box disarster , and to be fair many here will agree with him. But you should remember that it is torque that kills gear boxes and not bhp. so to a certain extent the capability of the gearbox to handle a turbo that will reach 350-360 bhp ( the Sc36 can only reach 360bhp with all appropriate mods ) will depend on how you map the ECU , If you go all out for 1,5 bar of boost at 3500 rpm then yes I can imagine a higher wear rate and evtl failure. If however you ask your mapper to call for say 1,2 bar till say 4000 rpm then you can protect your gear box and yet still have very decent performance. The point about the 2.0 is that it really needs to have forged pistons fitted , i have used in the past Sti pistons on the TD05 16g and these were perfectly ok , for a couple of years , until i had a problem with them expanding faster than the cylinder walls in very cold weather and causing a big end failure and scuff on all 4 bores. I have now changed to a semi closed deck and use Mahle pistons with more ring clearance than the Sti pistons had.

I dont' have experience of the VF35 but it is supposed to spool well enough , I choose the SC36 as it is basically a Blouch design that has a 30% lighter wheel , in my case i have combined this with a Harvey uppipe of middle size diameter and have kept a top mount IC and some mild head chamber work in order to get spooled up a bit quicker. I use a 3 inch 200 cpi cat , 3 port , 255 FP, 550cc Injectors. The combination of these mods with the new SC36 turbo, produces a much better drivability than with the TD05 16G. The down side is the cost of the turbo of course.

I think the TD04 Hybrid option could be a good alternative if you want the low down torque, but either way you go don't exoect your 5 speed to handle 1/4 mile starts for ever , as it wont. If you want a bit of a fuse in the drivetrain , you might consider only going to the Exceedy blue clutch. This I find has a less agressive bite than the Pink which lots use for >400 bhp of course it won't last as long , but mine has done 30 k and looked fine last time when I replaced the engine in jan .

Hope this helps
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Old 14 June 2019, 04:20 PM
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I'm not peddling gearbox failure, but it is a fact. Any of the turbos in question with the exception of the TD04 will make around 350bhp which on a 2.0L engine will make similar torque levels 350lb/ft as we know. At those torque levels the 2.0L WRX 5 speed box will not realistically last too long. The Hawkeye WRX 5 speed is slightly stronger but that doesn't really help the OP.

Thankfully, as it's a 2.0L engine than the failures I mentioned of head gasket and ringland are pretty much non-existent so that's a big benefit. With a standard WRX I wouldn't really be considering anything like the SC36 as it can push well above these levels and considering the amount of other things the OP has to upgrade here it's just another grand on top of a good VF35 turbo that will do just as well realistically.

As above, bear in mind the clutch may also be at its limits and the injectors will need changing fro the standard 440's currently fitted to STI 550 injectors.

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Old 14 June 2019, 04:40 PM
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True, and in my case I m going to be looking for a Re-map that gives me a nice 330lb/ft and then hold / increase at the higher rev range.
The clutch idea threw in as it will be softer on the box.
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