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Old 10-17-2013, 10:25 PM   #1
JungleFevre
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Join Date: Oct 2010
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Location: Milton, WV
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5-Speed

Default Swapping from 7cm to 8cm on 68hta

I have a Baja Turbo with a FP 68hta and supporting mods. Motor is coming out tomorrow for either valve or rings (will find out when its out). I figured might as well do some minor mods while everything is out because I'm going to need a new tune regardless. So the FP 68hta that I have been running has a 7cm hotside and I'm looking to swap it to an 8cm.

FP wants $295 for theirs. I found them on Kinugawa for $135. They are both TD05H 8cm housings...

Will theirs work?
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Old 10-18-2013, 10:24 AM   #2
JungleFevre
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looking to order soon bump
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Old 10-18-2013, 10:52 AM   #3
wrxlaunch
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Buy the fp... you may end up needing a new snail if u mix brands...
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Old 10-18-2013, 11:02 AM   #4
Subian
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The 2.0L that could

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I purchased an FP 8cm housing before from someone here on nasioc. Paid $150 for it slightly used. Here's some additional info on the 7cm vs 8cm. http://www.mainelysubarus.com/forums...68-8cm-on-25l/
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Old 10-18-2013, 12:08 PM   #5
boostkreeep
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Did it before when I had a 68HTA, any TD05H 8cm housing should work, I bought mine off ebay
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Old 10-18-2013, 04:17 PM   #6
bswilmington
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321WHP 422WTQ dynojet SAE

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If your going larger, why not go ahead and do the 10cm?
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Old 10-18-2013, 05:19 PM   #7
JungleFevre
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I feel like 10cm would be way too lopsided for the 68hta. I was just wondering why one would cost twice as much as the other...
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Old 10-21-2013, 02:16 PM   #8
Subian
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Dave D. had pretty good luck with his, from what i've read/saw 8cm might be a bit small on 2.5L cars with avcs. http://forums.nasioc.com/forums/show...ght=hta68+10cm
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Old 10-22-2013, 04:24 PM   #9
Dave D.
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Yes, my tuner, Dom recommended the 10cm and the build has been very strong as hta68's go.

Eventually I am going to go to a 1.5xtr as the '68 is more sensitive to heatsoak from what I gather from Dom and examination of many dyno charts.

That's why this is such a good E-85 turbo. For example, my best dyno #'s were at 50 degrees. Dom did some fine-tuning last summer at 80 degrees and the same setup was up in relative hp when he was done, but still down almost 30hp on the dyno.

I did a few 60-90 4th gear pulls in the heat and got about 3.9 seconds consistently. The other day when it was 47 degrees I was getting 3.2 over several pulls (this is right in there with my 6.0 second 50-100 time in winter). The 10cm does help with the heat soak, especially on pump. If you run pump, 10cm is a no-brainer.

(By the way, I managed 5.4 sec 50-100 all in 4th without my cargo rack, but all I had was a stopwatch at the time. )

Last edited by Dave D.; 10-22-2013 at 04:34 PM.
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Old 10-22-2013, 06:05 PM   #10
Leafy
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The kinugawa and FP housings are most likely both made by kinugawa.
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Old 10-22-2013, 07:39 PM   #11
alexandern05
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agile tuned 389hp 342ftlb

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If anyone has dyno charts of their hta 68 or one with each exhaust housing I'd be interested to see I have a hta68 on my ej207 it holds out good till around 7600 it starts dying pretty bad I was considering doing the 10 cm exhausting housing for better top end
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Old 10-23-2013, 12:34 AM   #12
Dave D.
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I need a new tuner!

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Old 10-23-2013, 07:23 AM   #13
alexandern05
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agile tuned 389hp 342ftlb

Default

Thanks I may try the 10cm housing on mine if I do ill post results over my current hta68 setup
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