Hi,
currently i have a 2.1 stroked engine consisting of 2618 mahle pistons,cosworth rods,acl race bearings and stock sti jdm version 8 heads running a vf37 twinscroll turbo.Im looking to buy a bigger turbo in the near future and im considering the md321 and the lm series as they seem the most recommended for a stock location.Im not considering a rotated billet gt30 setup mostly due to its laggier,costier,'uglier' and preferable requires an aftermarket ecu compared for example to the stock location md321V billet and as such i believe its not worth over the 'small' top end gain (circa 50bhp at most).My real question is,I know that a twinscroll setup with the vf37 turbo spools better than the single scroll.But on a turbo big as an md321T or md321V, is a single scroll setup preferred over the twinscroll setup?As i have a single scroll setup as well in the garage and dont know if i should sell it and keep the twinscroll or keep the single scroll for when im upgrading the turbo.And what is the best turbo to settle for on a 2.1 engine,is it the md321T or V?.Car is mainly a weekend car that is used mostly on road,some drag racing (circa 4 times a month though no competition) and ocassional track.What do you think?Thanks

 

If you're going for as LM or MD it makes no difference imo. These turbos are twin entry, not twin scroll. The internal snail is single scroll.

 

I see.Has anyone ever compared the md321 or lm's twin entry to the 'original single scroll' then?

 

Twin scroll SC50 Billet should also be considered, I think it's a bit cheaper than the alternatives

 

In tests does the e.g SC50 Billet true twin scroll give quicker spool than similar sized twin entry turbos such as LM or MD?

 

I think the Sc46 is better suited to a 2.1.I've seen some sc50 spool later than a md321v with the same top end.If i was you i would opt for an md321t or lm450.I've seen some graphs of both the md321T and the V and it clearly shows that the T is faster than the V in most of the tasks as it has approximataly 30bhp more in the midrange.

 

I'm unaware of anyone who has actually tried both on the same car, only way to know for sure

 

Thanks for the replies,keep them coming.

 

Hi,

Maybe people dont know about the all new SC42 + Billet twin scroll, specially designed as a true twin scroll, DIRECT fit turbocharger, it runs an SC46 comp wheel instead of the SC42 comp wheel but retains the SC42 turbine wheel.

Now go !!

In stock at £1495.00 + vat

Cheers
Kev

 

How much power approximatly does your new sc42 twinscroll produces kev?and do you have any graphs of it fitted to a car with similar spec as mine?

cheers