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Old 09-14-2017, 11:05 AM   #1201
soobaviator
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Quote:
Originally Posted by N-Bomb View Post
Just to be clear, since my tuner/mechanic says otherwise - the VF-36 and VF-37 use the same flange, yes? As in one would be entirely drop-in for the other?
Your tuner is right and wrong...

The exhaust inlet and outlet flanges are the same however the VF36 uses a RHF5H form factor CHRA while the VF37 uses the RHF55. The two are not interchangeable. If you are converting a ball bearing VF turbo such as a VF34, VF22 etc you need to use a VF36 housing. For journal bearing turbos live VF48, VF52 etc you need to use VF37 housing.

Sometimes pictures help:



Right RHF5HB (VF36) Left RHF55 (VF37) You can see that the tail length of the VF37 is quite a bit longer than the VF36. If you put the turbine housings side by side you will see that while flanges are same length from exhaust flange to V-band face is longer for the VF36.

The Kinugawa housings for MHI based turbos are from VF36 turbine housings. You'll see "5HB" lettering cast on the inlet flange. The VF37 wil have "55" in the same place. The RHF5H and TD05/TD06 CHRA's happen to have the same (well almost the same) tail length and the same V-band size so you can machine a VF36 housing to fit an MHI turbo without much difficulty.

-soobaviator
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Last edited by soobaviator; 09-14-2017 at 11:39 AM.
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Old 09-14-2017, 11:21 AM   #1202
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Default Stock loction Twin scroll turbo option thread

Quote:
Originally Posted by N-Bomb View Post
Just to be clear, since my tuner/mechanic says otherwise - the VF-36 and VF-37 use the same flange, yes? As in one would be entirely drop-in for the other?


correct. twinscrolls share the same flange type.
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Old 09-15-2017, 12:46 PM   #1203
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Quote:
Originally Posted by soobaviator View Post
Your tuner is right and wrong...

The exhaust inlet and outlet flanges are the same however the VF36 uses a RHF5H form factor CHRA while the VF37 uses the RHF55. The two are not interchangeable. If you are converting a ball bearing VF turbo such as a VF34, VF22 etc you need to use a VF36 housing. For journal bearing turbos live VF48, VF52 etc you need to use VF37 housing.

Thanks for the picture! However I'm still unclear - the turbos - the entire units, not just the housings or CHRAs, are not interchangable? Meaning if I took one entire turbo out, and wanted to put an entire of the other in, the UP/DP/oil lines/vacuum lines/etc wouldn't match?
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Old 09-15-2017, 01:24 PM   #1204
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Quote:
Originally Posted by N-Bomb View Post
Thanks for the picture! However I'm still unclear - the turbos - the entire units, not just the housings or CHRAs, are not interchangable? Meaning if I took one entire turbo out, and wanted to put an entire of the other in, the UP/DP/oil lines/vacuum lines/etc wouldn't match?
Right, you can swap an entire VF37 for a VF36. The components are not interchangeable however. That was the point for those looking to modify/convert other turbos.

-soobaviator
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Old 09-16-2017, 05:53 AM   #1205
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The VF36 and VF37 uses the same flange, meaning to say, you can use the same uppipe for either turbos. This is my understanding and experience.

I swapped from a VF49 (Non Ball Bearing) to VF53 (BB) previously with no problems
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Old 09-16-2017, 02:14 PM   #1206
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Default Stock loction Twin scroll turbo option thread

Yes, all the STI Spec C type RHF55 and RHF5HB TS are interchangeable as far as mounting.

The RHF5H turbos, VF38, VF44, VF45 are a different manifold, uppipe and downpipe from the STI. Those are from EJ20X/Y motors and won't fit the STI exhaust parts.
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Old 09-19-2017, 02:21 AM   #1207
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Okay cool. I was fairly sure that was the case. I just wanted to be sure before I hunt up a VF-36.

Thanks for confirmation
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Old 05-23-2020, 07:43 AM   #1208
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Default Stock loction Twin scroll turbo option thread

Hi all

Bumping this thread to extol the virtues of the blouch 1.5xtr stock location twin scroll with respect to boost threshold.

Running this on my v8 ej207 with Grb sti tmic and all other supporting mods - 3 port bcs and full 3Ē catless tbe - e85

From a data log I pulled a couple of days ago, Iím achieving 20psi by 3000rpm, 23psj by 3250rpm and 24psi by 3500rpm

There is still some fine tuning to go on my carberry rom

This is all in 4th gear on a ppg built 5 speed (audm 99/00 wrx transmission with 3.54 final drive)

In third gear boost threshold is 200rpm higher.

Iím extemely and pleasantly surprised by the above results and canít speak highly enough of this turbo for the ej207.

Will post an update when I complete some more fine tuning.

Mick

*Edit - I should note the reason I believe the boost is limited to 20psi by 3000rpm and 23psi by 3250 is my target boost table which I was conservative with when setting up - I will update once Iíve completed the final target boost table with higher boost levels lower in the rpm
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Old 05-24-2020, 07:13 PM   #1209
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The 1.5xtr 10CM T/S will likely be my next turbo.
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Old 05-26-2020, 04:14 PM   #1210
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What is the longevity of those turbos like ?

I have seen some friends here in the states have reliability issues back in 2014-2016 with them.
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Old 05-26-2020, 09:49 PM   #1211
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We ran one really hard for 2-3 years on my buddies car, made around 400whp and never had any issues.
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Old 05-26-2020, 11:04 PM   #1212
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Quote:
Originally Posted by Bansheeboy11 View Post
We ran one really hard for 2-3 years on my buddies car, made around 400whp and never had any issues.


Good to hear! Hope to eventually push mine to 28/29 psi once I install my headstuds and maybe cams

Mick
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Old 05-27-2020, 09:15 AM   #1213
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Yeh his car was in the 26-28 range with e85 if i recall, really solid powerband too.
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Old 06-05-2020, 12:18 PM   #1214
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Glad to see more information out here on twin-scrolls.

I'm pushing 451whp & 409tq @22psi on 93 out of the Blouch 1.5 XT-R T/S. Granted it required dual ewg's to get there. I'm seeing peak spool around 4300rpms. Then the S2 cams take over right after 5500rpms. I'm pleasantly happy with these results. Will eventually go E85 but just for cleaner aspect not for more power.
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Old 06-05-2020, 06:03 PM   #1215
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Quote:
Originally Posted by dud3tt3 View Post
Glad to see more information out here on twin-scrolls.



I'm pushing 451whp & 409tq @22psi on 93 out of the Blouch 1.5 XT-R T/S. Granted it required dual ewg's to get there. I'm seeing peak spool around 4300rpms. Then the S2 cams take over right after 5500rpms. I'm pleasantly happy with these results. Will eventually go E85 but just for cleaner aspect not for more power.


Those numbers are super impressive on 98 wow!

I really think the key here is the twin ewg. On the Blouch 1.5, the compressor wheel has enough potential flow for close to 500whp (71mm comp wheel is good for close to 500whp at the right PR and efficiency etc), limited by the clipped gt29 turbine wheel slightly AND more importantly, the mhi style housing.

Twin gates remove a hell of a lot of pre turbo EMAP / Backpressure, thus allowing greater AVCS optimization and therefore better VE

Iím a big fan of this style and should I get up going for more power once studs are done, Iíll definitely be going at least a single 48mm gate with divider (rhd car makes it extremely hard to fab twin gates on twin scroll header due to steering knuckle)

Mick
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Old 06-05-2020, 08:54 PM   #1216
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I would highly recommend that you reconsider running dual. Especially with twin-scroll, from what I understand, running a single EWG will suffice, but you'll want to bleed off pressure from both tubes. Granted, I've read strong arguments on both sides. Some say its negligible others are adamant on dual ewgs for twinscrolls. I understand they are pricey, but I would seriously ask your tuner or an expert.
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Old 06-05-2020, 08:56 PM   #1217
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Thanks mate. I am my tuner

Issue is not the cost - itís the physical space constraint for the dual gates. Will sus it out when i get to that stage

Point is though that the ewg definitely helps with ebp up top and will allow more timing / avcs overlap and therefore VE

Mick
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Old 06-05-2020, 10:07 PM   #1218
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Quote:
Originally Posted by dr20t View Post
Thanks mate. I am my tuner

Issue is not the cost - itís the physical space constraint for the dual gates. Will sus it out when i get to that stage

Point is though that the ewg definitely helps with ebp up top and will allow more timing / avcs overlap and therefore VE

Mick
LOL well, then you know what you're doing and will have a better idea/understanding of what the car wants/needs. I also, read over rhd....****. you are very limited on space. here's how I did it...(although it likely will not help you any)
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Old 06-05-2020, 10:08 PM   #1219
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can't seem to get the photo to work....but if you're curious, check out my Instagram @dud3tt3

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Old 06-29-2020, 11:16 PM   #1220
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Quote:
Originally Posted by dr20t View Post
Hi all

Bumping this thread to extol the virtues of the blouch 1.5xtr stock location twin scroll with respect to boost threshold.

Running this on my v8 ej207 with Grb sti tmic and all other supporting mods - 3 port bcs and full 3Ē catless tbe - e85

From a data log I pulled a couple of days ago, Iím achieving 20psi by 3000rpm, 23psj by 3250rpm and 24psi by 3500rpm

There is still some fine tuning to go on my carberry rom

This is all in 4th gear on a ppg built 5 speed (audm 99/00 wrx transmission with 3.54 final drive)

In third gear boost threshold is 200rpm higher.

Iím extemely and pleasantly surprised by the above results and canít speak highly enough of this turbo for the ej207.

Will post an update when I complete some more fine tuning.

Mick

*Edit - I should note the reason I believe the boost is limited to 20psi by 3000rpm and 23psi by 3250 is my target boost table which I was conservative with when setting up - I will update once Iíve completed the final target boost table with higher boost levels lower in the rpm

What boost will it hold until 8000 rpm?
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Old 06-30-2020, 06:05 AM   #1221
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Quote:
Originally Posted by suprabats View Post
What boost will it hold until 8000 rpm?


Itís holding 24psi but torque drops off around 7500rpm. I do have some more timing headroom up top though which could be causing it. Just havenít been game to add more timing until I hit the dyno and measure torque differential.
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Old 06-30-2020, 06:59 PM   #1222
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Quote:
Originally Posted by dr20t View Post
Hi all

Bumping this thread to extol the virtues of the blouch 1.5xtr stock location twin scroll with respect to boost threshold.

Running this on my v8 ej207 with Grb sti tmic and all other supporting mods - 3 port bcs and full 3Ē catless tbe - e85

From a data log I pulled a couple of days ago, Iím achieving 20psi by 3000rpm, 23psj by 3250rpm and 24psi by 3500rpm ...
Would you happen to know what your boost curve is on 93? My VF37 has always felt a little lazy until 4k-ish.
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Old 07-06-2020, 03:18 PM   #1223
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Quote:
Originally Posted by ether947 View Post
Would you happen to know what your boost curve is on 93? My VF37 has always felt a little lazy until 4k-ish.
Needs more EJ25X.
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