So I'm going to be ordering a red or green soon and I cant decide if I want to wait and find a twinscroll red or just pick up the new style.

Do the twin scrolls have the typical boost taper up top from the iwg?

It's just a street car that I drag and autox with a few times a year. Still has the Stock block. Comming from a maxed out 9 turbo. Just getting bored of the car.

I figured you guys would help me make a decision.

In one hand i already have am nice jmf o2 housing and twin scroll manifold in the other I have a 38mm mvs gate too.

Help meee

 

I'd say unless you're buying used, the SS housing is the only option for you. However, to my knowledge, the SS housing spools a little better. Only downside really is getting new parts to make everything work.

 

SS housing spools 500rpm slower. And has slower transient response.

 

Why?

I haven't been following the SS housing threads, but I always remember reading they spool slower. That's the price you pay for better top-end performance.

Choosing really depends on your needs and budget.

 

I have seen the sheets and the ss housing is 200 slower spool but I can deal with that if the boost control is rock solid on the mvs vs the iwg. That is the the only up side that i see besides if I go mhi it's going to be a used turbo. Ugh

 

All you need is the hotside off the turbo and they can machine it for the red. If you have the 9 turbo I would go that route.

 

Idk where you saw it being only 200rpm slower, but that isn't accurate. It really is 400-500rpm. And to me, the cut off for a fun street car is boost threshold at 4500rpm's. The SS red will not do that unless its on a stroker motor.

 

Thanks for the info I got a lead on a mhi red. http://forcedperformance.tumblr.com/...ing-innovative

 

This.

I went with a twin scroll housing for my FP Red. We have a four cylinder engine, so it needs all the help it can get

 

For a fun street car the twin scroll red gets my vote Good power by 3800-4000 and goes well to 8000. Port the entry to the wastegate flapper so you have better boost control and run a 18-20 psi actuator and boost control will be good. The Red with MHI will make 450-550whp pretty easy.

The twin scroll has near instant response at any rpm where the SS housing will act more like a vband 5858 and take some time to come up but lacks the flow up top compared to a Vband 5858.

Regardless, even though the SS housing makes much less back pressure it seems to make around the same or just a little more up top. The 58mm wheel has its limits.

I'd gladly trade near instant response for a little more up top every time.

 

We are definitely in the minority, on that one

 

DBB MHI FP RED + 02 dump + Turbosmart EWG + GSC S2 Camshafts + Fuel system to supply 600 HP = One killer setup.

 

Mine just has FP's port job, and with the 25psi gate, it holds 21psi from boost threshold to 8k running wastegate pressure. Maybe my car is just weird. It's never had boost creep on any setup. Stock turbo, the 71hta I had for 500 miles, or the red.

 

Car made 400/400 on a mustang dyno on a 9 turbo. 27 psi tapering to 24 on e83
Best Track time was 11.60 at 120 at the shootout.

Basic build

Twinscroll small runner manifold
Jmf hood dump o2 housing
Kelford 272 camshafts
Kiggly Street valve springs/retainers
GSC Zero tick lifters
Omni 4bar MAp
Aeromotive A1000 AFPR / fp gauge attatched with -6an lines.
Fuel lab filter 1000 micron e85 filter.
-6an lines from tank to return line.
ETS Short rout UICP
ETS LICP gen2
ETS 3.5 FMIC
TialQ 50mm bov
STM SD intake
Ghrim speed 3 port
Megan Down pipe
Megan Test pipe
Buschur SCCA
Deatschwerks 320 LPH pump
FIC BM 1250cc injectors
Fic fuel rail
Cb ported Im and 60mm tb

I think a red will be a good fit for this next summer and build the block next winter.

 

My car had stock cams and would creep after 5000 to 27psi even with an 18psi actuator set soft. I took the turbo off and had the wastegate entry ported and it was fine afterward. Stock cams may have held airflow back but I still made over 600whp later.

The 25psi actuator I got from FP was heavily preloaded from them and held 24psi and would make 40psi with boost control. I've run it two turns softer but it doesn't drive as nice as the 18psi actuator IMO.

Sadly, the 18psi actuator won't make over 30psi above 7300ish.