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06-18-2010, 01:34 AM | #26 | |
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Applying logic: 18g-XT will outflow 18g therefore 18g-XT 8cm2 will outflow HTA68 10cm2 And that pretty much sums up the top-end debate. (As if it was ever really a question, the HTA68 is more like a 16g-XT and probably should be compared to a 16g-XT, not an 18g-XT.)
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06-18-2010, 11:21 AM | #27 | ||
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but like i said before.........if they wanna play like that, you should really compare the 47 lb HTA68 to the 47lb 20gxtr. Anywhoo.....heres a HTA68 on e85....on a DJ....380whp......vf turbos do that Quote:
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06-18-2010, 11:31 AM | #28 |
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Its very nice to see that the this HTA68 hype is finally coming to an end !
-- Ed |
06-18-2010, 02:21 PM | #29 |
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The other thing those HTA68 vs. 18g graphs demonstrate is the really minor effect that the billet wheel really has.
non-billet 18g is essentially identical peak HP, with the billet HTA68 showing a minor 3% average torque advantage... However, that 3% gain is less than the difference between the worst and best run on the three dynos of the 18g. Meaning the advantage is 100% in the noise. In other words, a non-billet wheel will perform, for all practical purposes, identically if it's sized comparably. So bargain hunters, watch the classifieds as those who don't understand physics dump their 'old tech' turbos in favor of the new hot thing that will net them a virtually unmeasurable gain. I already picked up an 18g for CHEAP, cheap enough that even if it needs rebuilt, I'll come out ahead. |
06-18-2010, 02:32 PM | #30 |
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Will a td06 8cm2 20g outflow the turbos mentioned in here?
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06-18-2010, 02:39 PM | #31 |
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I just noticed (using the 18g's best pull) that the hta68 has +9 average hp and +9 average torque through the powerband. I will be going full 3" soon for a fully valid comparison. Edit: now I see the 3%!
Dom thinks I'll pick up 25 hp or so. I'll post the results within a few weeks. Last edited by Dave D.; 06-18-2010 at 03:16 PM. |
06-18-2010, 03:03 PM | #32 | |
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-- Ed |
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06-18-2010, 03:16 PM | #33 |
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From Airboy 's own car. Calgary elevation is 3438ft.
http://www.westernsubaruclub.com/smf...2750#msg122750 |
06-18-2010, 03:35 PM | #34 | |
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Can you tell that statistical analysis is part of my job? Full 3" will help some, I guess we have to wait and see to determine just how much of these turbos are magic. I'll be surprised to see identical spool (as these two graphs clearly show) and 25HP peak difference, but we'll see. I'll gladly eat my words if the data shows it. That's the thing about a well thought out objective analysis, you can actually get people to change their minds. Last edited by Concillian; 06-18-2010 at 03:42 PM. |
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06-18-2010, 03:48 PM | #35 |
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It makes a MASSIVE difference compared to a stock exhaust! Spool up is way better and makes more power too.
(and I think a 10cm turbine housing is way to big for the HTA68, doesn't really give any gain compared to a 8cm housing) So if you run the HTA68 with 8cm housing and 3" full exhaust it will be quite a bit better compared to the regular 18G in the lower RPM range. The response time when at 4000 - 5000 RPM is much better too. (due to the lighter compressor wheel) Mark. |
06-18-2010, 03:59 PM | #36 | |
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There were plenty of other pulls, ranging from 340/370 to 305/350. There were several 325/360 pulls, but the motor started to heat soak and pull timing up top, which Dom said was mainly due to a restrictive exhaust. He said this was as balanced as he could get on the STi catback. The pull I have showing was a maintainable pull on a heat-soaked engine. So I guess I really need the 3" exhaust (q300 is on order) to have a fully valid comparison with all else equal. I would be quite satisfied with a consistent 340/370! |
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06-18-2010, 04:02 PM | #37 |
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06-18-2010, 04:02 PM | #38 |
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MTL_SLVR_WRX- You sir have PM...send your turbo in for a rebuild to include their new billet wheel!!!!
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06-18-2010, 04:50 PM | #39 |
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This should've been comparison between Hta68 vs EvoIII16G. Sounds fair?
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06-18-2010, 05:09 PM | #40 | |
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I thought it might be fun to try the hta68 and go for the upper end of the data pool, myself. |
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06-18-2010, 06:14 PM | #41 | |
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Regardless, that was only on 23psi for the 68hta, it will hold 28-29psi to redline, I'd love to see a vf do that. I still say if you max out any vf series turbo and a 68hta, the 68 will make more power. Also, is FP offering the 68hta in different sizes now? I checked their website and it didn't mention any options other than the td05 16g housing. It seems everyone has been sending them to Blouch to get the larger hotsides, that seems to me to be a waste of money. Just buy at 20gxt-r from Blouch. Of course, if you already have the turbo, not such a bad idea. |
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06-19-2010, 04:34 AM | #42 | |
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If you want to run it that high boost, you need VERY efficient intercooler and/or E85 to cool down the charge. Otherwise you need to take out soooooo much timing to avoid knock that it's wiser to run a bit less boost. (which will give you more power overall) This turbo works (very) well on EJ205/207 on pump fuel with decent FMIC, but not with stock TMIC. On EJ255/257 it works very nice also on TMIC and pump fuel. It really shines with E85 (on either 2.0 or 2.5 engines) even with TMIC. I am talking about the stock FP version with 7cm turbine housing. Mark. |
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06-19-2010, 09:30 AM | #43 | |
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The hta68 hype was really frustrating and although most have realised the dynojet results were bloatedbs, there are still some fanbois who just don't get it. Go a 20G or 30R and and be happy Leslie |
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06-19-2010, 11:28 AM | #44 | |
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Im looking for a stock location, hard hitting, spooled by 4k or so turbo |
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06-19-2010, 02:37 PM | #45 | |
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I was holding 29psi to 6500rpm, then dropping to 28 at 8k redline. |
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06-19-2010, 03:58 PM | #46 | |
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It is a great setup and although it goes very hard, I wouldn't say it hits hard - with current tune, power comes on fairly linear: It might be just a little on the large side for you though from the soiunds of it. Maybe a TD05-18G would be more suitable for you, as it hits peak torque about 1000rpm sooner then the 30R. Leslie Last edited by wrxsti.l; 06-19-2010 at 05:42 PM. |
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06-19-2010, 05:29 PM | #47 |
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i might get a 20g-XT but wich one is better? 7cm or 8cms?
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06-19-2010, 07:03 PM | #48 |
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i've got a 8 cm and it runs like a raped date puttin down 365whp 386wtq the tuner says it has alot left in it too we just stopped because we were worried about my tranny
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06-19-2010, 07:13 PM | #49 | |
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-- Ed |
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06-19-2010, 08:48 PM | #50 |
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