What turbo md321t, rcm450 or sc46
 

Trying to decide on what turbo to get the garage that did my engine recommend the rcm450 but I have been looking at sc46 and md321t

The spec off my car is

2.5 cdb pinned
Acl racing bearings
RCM rods
RCM pistons
RCM oil pump
RCM 12mm to 14mm head studs

This is in a 08 sti hatch

So what would you go for and how

Thanks alan :thumb:

Sc46. Had one one my 2.0 before and loved it if a little lagged but should be superb on a 2.5

Alan decide how much power you want to run and then pick the smallest quickest spooling turbo out of your choices that can do the job.SJ.

Looking to run about 450bhp and don't won't a lagge turbo don't no much about turbos that's how I am looking for someone to tell me the difference in them all

What I can see is you can pick the md321t up second hand any day off the week and you never see the rcm450 or the sc46 secondhand

I'd possibly consider an sc42, been hearing some good things about that combo lately, makes close to 450 and spools very well getting you up and going.

I agree that a billet SC42 should spool up nicely on your 2.5 and definitely produce the goods.SJ.

MD321V billet works well on the 2.5
Spools well with almost no lag providing you compliment with the right supporting mods,
500 capable / more with meth
It will run 460 with little effort

Sc42 with spash of meth

Don't won't to fanny about we meth so sc42 would be pushed to mack 450 bhp

the MD321V has been recommended to me for my forged/pinned SCB 2.5.
My T spools up quick, full boost by 3700rpm at 1.5bar but is disappointing mid and top-end.
The V can come with an alternative 58mm housing which curbs the power a bit but is still an £1800 outlay new.
Trev

Thay all cost about the same now so not to botherd but you can pic up the md321t second hand

Got a MD321T for sale £900

What about one of Andy Forrest's offering? His gt480 on a 2.5 made circa 470bhp and a whopping 520lbft. Yours is pinned so should in theory be good for it. Oh and he made that on an OE top mount. Comes in at £1395 which seems cheaper than similar turbos.

Does anyone have any experience of Andy gt480 or gt420?

Joe

Dident no Andy was supplying turbos

Andy's been supplying disco potatoes forever

On a 2.5 lag on any of the mentioned turbos won't be an issue. The SC42 is a bit small for 450 on V power only, I'd go for an MDX321T or a V if you fancy close to 500. The RCM turbos are very similar to the MD range & worth considering too. SC46 will do the job too, you have plenty of good options for your power level.

I'd try an SC46 with the new cast 7cm exhaust housing !

These are just standard fit GT30 hybrids AKA 321T's and 321H's AFAIK.

Yeah there a standard position gt30, there a lot cheaper than the md series turbos. You just don't see a lot of people using these. Any reason why?

Joe

It was actually a MD321T Andy had on his old Spec C 'shopping car' that made 480 and 520, think he also ran a 11.0 second 1/4 mile time with it as well.

So there's nothing in it then. I would have thought with Andys being so much cheaper they would be a bit more popular. I mean there nearly £350 cheaper than a md321t

As Martin j says , sc46 will work a treat with right mods :thumb: I run an mdx321v on a fully forged 2.5 hawkeye , still on standard top mount and injectors @ 1.4 bar tailing to 1.3 made 428 bhp and 407 torque ! Next mod will be front mount and bigger Injectors to get me some more power :D

Just double checked Laterals site and it is deffo a 321T Andy was running
http://lateralperformance.co.uk/prod...450bhp__billet

As for prices I'm not sure, most of these guys/places have their own hybrid version of the GT 30 so I woulden't be surprised if Andy has tweaked it to his own design.

So all these turbo will be about the same just some dident tweaks from each suplyer

Basically yes, the average road user would hardly notice the difference between them TBH.

Thanks for that dunk

Have you spoken to John from BRD, his Turbo's are getting rave reviews on SS.net and we have one ourselves for our demo car. Price wise beats most other suppliers and will build you one to specs to suit what you need specifically for you car.

I did Speek to John and he just filld my head off stuff I don't no about I told him what turbos I was looking at and started going on about different size housings what I don't no what it dus I just won't a turbo that has early spool and makes 450bhp or just over

He really knows his stuff with turbo's Ive got a TD05 20G from him if i recall correctly he uses a 7cm housing to keep it fast spooling. His Turbos, are generally the same as all the other brands but cheaper for the same thing.

Will speck to him Agen will get him to tell me in dummy terms how they work