I've been looking at building a divided 6 into 2 turbo header for my 2JZ. I will be using 1.5" schedule 10 SS piping for the manifold. Here is an interesting model I did in solidworks comparing the T4 and T6 divided flanges when used for a 6 into 2 collector. It seems to me that the T6 collector would be much easier to build since the tubes match up much better to the turbine flange inlets. From my models it looks like you would have to crush down each 3-1 collector on the t4 flange for it to fit up properly. What yall think?

Justin









Modified by Justin Olson at 8:44 PM 11/6/2007

 

I would go T6 on the motor

 

More renderings: The T6 collector is about 4.25" tall w/ flange. The T4 collector is 5.25" long w/ flange due to the smaller area it is merging into.







Regards,
Justin

 

Nice solidworks drawings man!

IMO though, the decision to go with one or the other would be the overall turbo choice. Its not like you can really get any turbo in a T6 application. however, if the turbo your looking at can be had with either flange type, I'd definetly go T6.

 

T6 rookie beyotch!

 

Whats your overall goal for the car?

 

I think I'm the only one with Solidworks that doesn't even use it....wtf.

 

8's and street driven

I'm going with a S480 BW turbo. There is a option between Divided T6 and Divided T4 housings. I'm going to try the Divided T6 first. I can bolt on a divided T4 turbine housing later if I decide to.

Regards,
Justin

 

I've fabbed up plenty of the t4 divided 6-3 style collectors, use a 30 degree angle, My collector is only 3.5" tall. 1.5" shc40

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dave@passenger &raquo;</TD></TR><TR><TD CLASS="quote">I've fabbed up plenty of the t4 divided 6-3 style collectors, use a 30 degree angle, My collector is only 3.5" tall. 1.5" shc40</TD></TR></TABLE>

Thanks for the tip. I'll model this up when I get home.

Regards,
Justin

 

If you wanna run 8s...theres no reason to even look at the T4.

That is definetly one ginormous turbo.

Just don't crash.

 

That is the ultimate goal. I need to get my car running first. Then take it to the track and run some numbers.

A guy in florida has done 8.9's with a T76GTS w/ n20 on his 2JZ in his 240z.

http://videos.streetfire.net/v...d.htm

Justin

 

Dave, I dont see how you get the tubes to meet up to the turbine entrance without squeezing them down in a press after you've welded up the individual 3-1 collectors. I rendered 3.5" long tubes of sch 40 1.5" material into a divided t4 collector w/ a 30 degree angle between the two collectors. As you can see, as the angle between the two 3-1 collectors increases, the less the tubes will match up to the turbine entrance without forming them.






This picture is a sectioned down view of the collector so you can easily see the collector to turbine flange inlet.




<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dave@passenger &raquo;</TD></TR><TR><TD CLASS="quote">I've fabbed up plenty of the t4 divided 6-3 style collectors, use a 30 degree angle, My collector is only 3.5" tall. 1.5" shc40</TD></TR></TABLE>




Modified by Justin Olson at 9:58 PM 11/7/2007

 

They don't fit perfect, theres no way they will, but its close enough that 5 minutes of porting later its smooth in there. I don't squeeze anything its all cutting.

 

I'd go with the T6 if you're trying for 8's in a street car. You'll either have a 6-spd to select a low gear or a 3-spd in which one gear change brings the revs up ~30%. Or just play catchup when ANYTHING trys to race you

 

I've seen a 71GTQ supra run a 9.3 ET so stripping some weight and switching to a 74mm GT42R will do the work with a T-4 exhaust and be way more streetable than a T-6 turbo equipped since all of the T-6 have a 1.15+AR and lag till the next season is approaching. But to each his own. The supra guys solution : 300 shot of giggle gas.

 

I'm doing a TH400 transmission behind it with some nitrous to flash the converter and spoolup.

Justin

 

deng building a beast..gl

 

I was modeling the amount of grinding necessary to match the t4 flange outlet to the collector outlet. That can be seen in green. Also, this does simulate going in a welding up the four interior corners of the collector/flange merge as there is a abrupt shoulder there. Anyway, heres the picture.



Justin

 

Justin... I would recommend making your inner circumference match the port circumference....then beating it with a hammer against an anvil to match the exact shape. This reduces the amount of time you'll spend porting by a ton and make your collector looks tons better as well.

Go with the T6. the bigger turbine housing wont sacrifice "that" much spool up time but will give you large gains on the top end (100+whp)

If you're going to run the auto...and spray on it... I would go with the 4780R. :D

Give John Reed a call at RRev...its not like they've never built a supra before

 

Yeah, I've been bugging the RREV guys a lot lately. Looks like a found my TH400 setup complete so I'm pretty excited. I'm going with a T6 for sure. I think I'm going with a Borg Warner turbo so I can do a divided T6 turbine housing. I want to see how that would work.

Justin

 

i'm planning on running the same setup on my sc300. if your still stuck with how to make this fit, i made a "pipe squisher" out of a bottle jack and some bar stock. i use it to port match runners, but you could use it for what your trying to do. probably more helpful with the t4 obviously.

that t6 borg warner is a big boy though. from what i remember, it's not even on the efficency map until your about 12 psi.

good turbo for $500~$600

 

The problem with the s400 off the shelf is its 96mm turbine wheel. Just massive for any import engine. Not bad for a v8 turbo engine. Its a pretty sweet turbo for $585 though since it will support 925whp+ though a manual trans.

I going to try and build a divided t4 collector since I have the material here. If it turns out decent, I'm just going to run a t4 turbine housing.

Justin

 

I re-read your post justin... FYI the T6 manifolds for supra's are all made from 1.25" sch 10 piping. not 1.5" like you have modeled maybe this will help you a little bit

 

I checked into this and the exhaust port ID is ~1.6". I wouldn't use the 1.25" sch10 as its steps the size down too much IMO.

Justin

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by .RTErnie &raquo;</TD></TR><TR><TD CLASS="quote">I re-read your post justin... FYI the T6 manifolds for supra's are all made from 1.25" sch 10 piping. not 1.5" like you have modeled maybe this will help you a little bit

</TD></TR></TABLE>