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ECMlink Twin Scroll T4 6466 spool Questions & Results

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Archer Fabrications

10+ Year Contributor
9,734
695
May 9, 2011
Scottsdale, Arizona
hello everyone i just got the car up and running last week or so with the new 6466 in the 1.15AR T4 twin scroll housing and getting it dialled in I'm wondering if i got a housing too big, I'm seeing conflicting results on the eve board and i don't think THAT many people are running this turbo let alone in T4 twin scroll on the DSM platform, but i figured id ask here anyway. I switched to this turbo from an HX40 as many of you know and fabricated and Tig welded a top mount manifold for the new turbo after 9 months of sitting while the manifold was getting worked out. so i get to take it out and first of all I'm expecting full boost by somewhere in the 5500rpm range i know the 1.15 is a large housing but still expected as such. I'm not seeing 30 psi tip 6k rpm, are other people getting better spool then this with this housing? just went out a few minutes ago at 36.6psi and it didn't hit until 6850 and ill be posting the logs.

heres a little bit on whats changed/relevent mods on the car (profile is up to date as well)
PTE6466 Gen2 1.15AR t4 TS
Archer Fabrications Top mount Twinscroll T4 manifold
9:1 2.0
2g head with BC272's, stock intake manifold and 1g TB
FIC2150's
Walbro 450 Rewired
-8 Feed to rail, -6 Return
ETS 4" FMIC
Fuel: VP C16
3.5" side exit with a total length of 35inches.

at first i had an open T4 gasket on the turbo because that was what was supplied from precision, and i thought that may account for the lag but after changing to a Vibrant divided gasket it made no difference the thing still spools really late. any thoughts here or personal experience?

the airflow numbers are under inflated because the Boost set is low, so i probably need to lean out the global some more to get that to match, but I'm more worried about how i can get this thing to spool quicker, or if i should look into a smaller TS t4 housing like the 1.00AR or even the .84 AR

first log is a 3rd gear, second log is a little bit of 1,2 and then the 3rd
 

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Well i read that the twin scroll is supposed to spool like a housing 60% of it's size and flow 90% of the power it's size when compaired to an open scroll.

So if a 1.00AR Spools like a .60AR and flows like a .90 that is probably where i wanna be BUT heres my issue with this. My hx40 spooled 38psi by 5500 on the .70AR on a larger turbine exducer and smaller compressor by 4mm...

The 1.15 should spool like a .69AR (or about where my hx40 was although i understand volume difference between t3 and t4) using the 60% rule so WTF?! Should spool like a .69 and flow like a 1.06 or there abouts!!

Does my spool numbers sound right for this housing? If so I'll definately step down to the 1.00 in hopes I'll get the spool down at least 500-800rpm

My buddy @jery1234 close to me is seeing 42.8psi by about 6k flat but he is a 2.3 auto with 10.5:1 same turbo same housing.
 
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Just because everyone says it " should spool like something 60% smaller " doesn't actually mean it will. Everyones car is different. ..on that note im selling a t4 gen2 twin scroll 6466 .84ar turbo.
 
Your primaries are probably way to big.

As a point of reference, my ancient tractor BW 62/91 76/65 made 30psi at 4500 in a .84 t4 t/s. The runners are small, and paired wrong. 1+2, 3+4. Single WG with a divider. That setup made dick for power though. That's also got a huge set of old heavy cast wheels.
 
I'm not sure I believe the twin scroll vs. open scroll theory completely.:hmm: I just feel that you're too big with that housing, or maybe even the 1.00 still may be too big. I think stepping down your housing size will definitely help and I think the 1.00 will get you down at least 500-800rpm like you want. I just think it may be better to get it down even more with the .84 but whatever you choose good luck!
 
I just checked your profile, the manifold looks good but please share some info on how the wastegates on setup on the manifold and there placement. Also can you share the size of your runners.
 
I just think it may be better to get it down even more with the .84 but whatever you choose good luck!
That .84 will get the spool up, but I doubt it's going to be 1000+ rpm. It's also going to cost power.


Smart thing for the OP to do would be to get an EMAP setup and see what the drive pressure is doing. Then you can see if you can afford to goto the tighter housings. I'm sure he could also put it on the dyno to play with cam gears to maybe help get it up a bit earlier.

Pneumo on here was running a 6466 in an open t3 in a header he made, and I think it spools better than this. I'd check his results and compare to what you have going on.
 
I have the same turbo 6466 ts 1.15 ar & I see 42.8 psi @ 6k . I also have 6266 t3 open scroll 0.82 ar & there is only 100 rpm difference in spool on the same engine . True I'm 2.3 but I have full 3 inch exhaust & op has 3.5 inch site exit ,so ts is definitely working for me . If I had 3.5 inch site exit I could probably cut 500 rpm if not more in spool . I also have new 1.32 ar ts housing that I'm going to try very soon to see the difference between 1.15 ar &1.32 ar. Two logs to compare
 

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Thanks for the replies guys. As for manifold design, it's nothing huge. It's what everyone else uses, 1.5" sch10 piping and the gates are equal length something like 3.xxinches

I do not have adjustable cam gears installed,but i do own a set. i think playing with that will help a lot and i dont think I'll switch housings until i install those along with my BC276/276 and dual springs at the same time.

My manifold is 1+4 and 2+3. There is a difference in length between the two volutes about 6ish inches. Longer runners in 1&4 at 32inches, and 2&3 are about 26 inches. Each volute is equal for it's cylinders though. Long runners do decreae spool a little but they increase top end flow. This manifold is a prototype. I do plan to make many more and eventually sell them, i have ice engine works modeling blocks to help with design from now on. The next model will include all 4 runners equal.

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This is the exhaust on the car i dont think drive pressure is an issue at all it's 3.5" ID and 35 inches long:)
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Is the turbo JB or BB?
Mine is Ballbearing.

Edit: I'm compairing logs with jery1234 and he is seeing 44psi by about 6100 on his 2.3 and I'm seeing only 32psi by then on my 2.0. Anyone else run this turbo and AR on a 2.0 that cares to share logs or spool times? It's really not that much bigger in wheel spec then my hx40 and i can't imagine the housing is THAT big.
 
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I can't see the logs but UrbanSmoker did you ever find an answer? With my huge King Kams I get 38psi at 6700rpm on my 1.0 a/r t4 comp turbo 6767. Do you have any idea or know how much whp you are making on spoolup to 36.6psi?
 
huge as in length or huge as in DIA, you have said this before but i use the same material as all the other guys same size same thickness... Not sure how you come to that conclusion. I'm going to track tomorrow hopefully

I'm on BC272's so it isnt cams too big being the issue. I replaced the lower intercooler pipe hopefully that was the issue. But I'll post results and videos tomorrow
 
I used 1.5" sch10 thats 1.5" ID my old stm manifold was the same. And my head flange was socketed for this material (all of them are from SLS)
I'm 100% positive STM, JMF, toxicfab, all use 1.5" sch10 toxic uses sch40 sometimes. And other guys ive talked to that do bmw and ae86 manifolds All inch and a half all of them. Yes a 1.25 may give more velocity and less flow for spool but I'm not trying to choke anything either.

Whats a valve curtain area? Like the valve train?
 
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I used 1.5" sch10 thats 1.5" ID my old stm manifold was the same. And my head flange was socketed for this material (all of them are from SLS)
I'm 100% positive STM, JMF, toxicfab, all use 1.5" sch10 toxic uses sch40 sometimes. All inch and a half.

Whats a valve curtain area? Like the valve train?
It's a value derived from valve diameter and lift.
 
Just saw a diagram. I couldnt tell you that measurement i didn't build this motor my friend back in seattle did. But it's just a stock head with stock springs and BC272's it had a 3 angle valve job and a deck and clean thats it.

I have BC dual springs, cam gears and 276/276 when I'm ready to take the head off.
 
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