T3 to large for stock? - Printable Version +- STD (https://www.superturbodiesel.com/std) +-- Forum: Tuning (https://www.superturbodiesel.com/std/forumdisplay.php?fid=6) +--- Forum: Engine (https://www.superturbodiesel.com/std/forumdisplay.php?fid=7) +--- Thread: T3 to large for stock? (/showthread.php?tid=2735)

T3 to large for stock? - winmutt - 06-21-2011 So I got my HY30W for the w124 and it has a t25 flange. This was a bit of a surprise but it got me thinking. As far as I can tell the hy30w flows about 1.5 better than the stock turbo and at 1.5 more pressure. Each exhaust runner is slightly smaller than the t25. For stock fueling it seems to me that a t25 flanged turbo is a better match than the t3s. As the t3 is used for some quite large turbos this leads me to believe that we are really on the minimum side of usability of the t3 flange. I am hoping the smaller flange makes for quicker spool without much impact on the back pressure. As you can see the t25 flange is about the same or a little larger than the 606. If this works out well I think I will probably get a t25 flanged turbo for my w123 as well. RE: T3 to large for stock? - dieselboy - 06-21-2011 True there are some large t3 flanged turbos. I have a hx40 with a t3 divided flange. My hy35 is a single scroll t3 flange. Finding a t25 flanged turbo isn't as easy and the selection isnt as great as the "standard" t3. You will increase velocity but at the expense of turbo drive pressure and egts. You can try a Mitsubishi turbo. Something like tdo4-4. Still a t3 flange but it's a newer design turbo. I have one at the shop I can take a few pics of. RE: T3 to large for stock? - Captain America - 06-21-2011 I haqve always wondered why the T3 was used on the 617 since it doesn't flow anything really. RE: T3 to large for stock? - randomdude - 06-24-2011 so my 617 uses a "standard" T3 flange? RE: T3 to large for stock? - willbhere4u - 06-24-2011 yes it dose! RE: T3 to large for stock? - randomdude - 06-24-2011 what flange is a nonegr mani? whats the biggest "plug and play" for a nonegr mani? sorry to thread jack RE: T3 to large for stock? - Captain America - 06-24-2011 Non EGR also uses the T3, same as the EGR manifold. Take a look! http://www.superturbodiesel.com/std/showthread.php?tid=1694&highlight=exhaust+manifold RE: T3 to large for stock? - randomdude - 06-24-2011 oh nice! thanks for the linkie. ive had my head under the hood of nothing but volvos for the last 8 years even tho ive been looking for one of these. im trying to soak up as much as i can as fast as i can so i dont have to ask the silly nooob questions lol.