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Old 05-12-2009, 01:30 PM   #1
John@Cobb
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Default HTA68 TECH Thread

It has come to my attention that some people may take this thread as a sales pitch or company wide support of the HTA 68. That is not the intended purpose of this review. I wanted to take the time to test a new turbo in the market and provide the community with the most detailed and unbiased report possible. This thread and it's sister thread are here to serve the end user, not the manufacturer. Had this turbo performed poorly or been of poor quality, the review would also have stated that. I(as a rep of Cobb Tuning) only intended to provide useful information to the community that has supported us for so many years. I will always try to give back to this community, as best I can in the form of testing, reviews, or general knowledge. Thank You NASIOC. -John Shafer, Calibrator COBB Tuning

I wanted to start this thread to have a repository for technical data and dyno plots for this turbo. The other thread was getting a bit long, and can be tough for some guys to page through.

I wanted to add some insight I gained from a second round of testing. I installed this on a Stage 2 car. TBE and a Stock Airbox. I wanted to test a few things, one would the gate work well at this level of modification, is fitment consistent and would the stock air box be a restriction. I did not put up a dyno plot for this as I have more testing to do and this is very consistent with what we have seen already from my early tests and Airboys charts.

The test car is a 2006 STI. I am easily able to hit 22.5PSI and taper to 18.5 at 4500' above sea level. This is with a 3 port solenoid, running 70%. I think this data is a bit skewed, due to the airbox(next paragraph). I am satisfied that the internal gate that is on the turbo will hit 24PSi and hold 20 - 21 at redline at sea level. I think this will be more than ample for most users. If you are looking for more boost, I would upgrade to a higher spring rate or go external. This turbo does NOT creep and is very capable of holding boost to redline.

I would also suggest that anyone who wants to see the full potential of this unit, you will need to free up airflow, by going with a cold air or short ram intake. I am normally a very big advocate of the stock airbox, but in this case it IS a restriction. I will be retesting with an intake shortly to quantify the findings.

This turbo will act as a larger unit if the supporting mods are there. I would highlyt suggest 740cc injectors or bigger. A stage 2 car is a must, headers, intake, external gate and meth are all very good options to extract the very last bit of performance. If you jusr drop this into a car with an exhaust, it will perform very similarly to the VF39, however it will hold boost to redline easily. You really unlock the potential of this turbo when you free up the airflow for this unit.

....Follow Up on the install...
-Fitment is excellent, however the coolant line running adjacent to the oil retun can hit the block. As such you can do 3 things. 1. Grind down the block a very small amount. 2. move the coolant line slightly to gain clearance. 3. Leave it alone. It make a very small dent in the line. I have not seen any indication of a potential failure as it is a very minor contact point, but it is worth keeping an eye on. It does not hit like the older turbos from FP. I have reported this and they are (maybe already) going to make a minor adjustment to the compressor housing so the line can swing further out of the way.

...I have not tried putting the VF coolant line in its place, that may also solve the issue if it fits.

Thanks guys!!
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Last edited by John@Cobb; 05-20-2009 at 05:20 PM.
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Old 05-12-2009, 01:51 PM   #2
sorrowfulkiller
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looks good, now get some sort of dyno chart, would like to see what kind of power band you have.

A dyno to dyno comparison between stock airbox and aftermarket would be perfect ^_^
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Old 05-12-2009, 02:14 PM   #3
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so it sounds like it didn't make good power on a typical stage 2 car. why withold the plots?

personally I'd like to see how it faired with the set up the car had, and then show the difference with the aftermarket intake.

it would allow for a more clear picture on what this little turbo really does.

No offense to you john, because I appreciate you testing this turbo, but this is how I read the thread:

we tested on a 06 sti typical stg2
we didn't get the results we wanted
we aren't going to provide power #'s because of this
we think the problem is the stock airbox
we will post dyno sheets when we confirm this
we are going to say it holds boost better at redline than a vf39

Last edited by Illusive; 05-12-2009 at 02:22 PM.
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Old 05-12-2009, 02:22 PM   #4
C J
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I want to see power numbers too
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Old 05-12-2009, 02:36 PM   #5
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Man... stop being paranoid. It made 360TQ and 310 HP. I can get the chart, I just wanted to spend more time with better testing. I will get you comparo dyno plot. I just wanted to let other tuners chime in with their results, as another outside perspective.

J

Quote:
Originally Posted by Illusive View Post
so it sounds like it didn't make good power on a typical stage 2 car. why withold the plots?

personally I'd like to see how it faired with the set up the car had, and then show the difference with the aftermarket intake.

it would allow for a more clear picture on what this little turbo really does.

No offense to you john, because I appreciate you testing this turbo, but this is how I read the thread:

we tested on a 06 sti typical stg2
we didn't get the results we wanted
we aren't going to provide power #'s because of this
we think the problem is the stock airbox
we will post dyno sheets when we confirm this
we are going to say it holds boost better at redline than a vf39
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Old 05-12-2009, 02:40 PM   #6
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Compressor chart, stat.
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Old 05-12-2009, 02:51 PM   #7
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Quote:
Originally Posted by Merp View Post
Compressor chart, stat.
Probably won't happen
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Old 05-12-2009, 02:57 PM   #8
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How about an OTS map for this turbo?
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Old 05-12-2009, 03:09 PM   #9
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HTA v DOM3 22PSI


Ask and ye shal receive...lol

HTA v STG2....The HTA on this is a pure stg2 TMIC, STK Intake(air box). The other two STG 2 cars have headers and an intake, but it was the best curves I had on short notice.....


And this one is a teaser...NOT AN HTA68... Dom3 v HTA Green at 22PSI, but look at the flow on the green!



As you can see in the STG 2 comparo, the power curve is plateauing, and it is struggling to get airflow.

-J

Last edited by John@Cobb; 05-12-2009 at 04:42 PM.
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Old 05-12-2009, 03:18 PM   #10
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Thanks for the dyno charts. Looks good. John, just curious, do you think someone could get 400 hp out of this turbo without doing drastic block/internal modifications?
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Old 05-12-2009, 03:45 PM   #11
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With the HTA on the stock box making 300ish whp tapering to 285, typically on this dyno what would this equate to in trap speed?
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Old 05-12-2009, 04:38 PM   #12
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Quote:
Originally Posted by John@Cobb View Post
Man... stop being paranoid. It made 360TQ and 310 HP. I can get the chart, I just wanted to spend more time with better testing. I will get you comparo dyno plot. I just wanted to let other tuners chime in with their results, as another outside perspective.

J
Thanks for posting the plots
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Old 05-12-2009, 06:00 PM   #13
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Quote:
Originally Posted by STi Mikey View Post
With the HTA on the stock box making 300ish whp tapering to 285, typically on this dyno what would this equate to in trap speed?

Hard to say because we are at elevation and have a crappy track to boot. With my Dom 3 that he so shamelessly posted the comparisons about and 380 whp I trapped at 112-113 pretty consistantly. Take that for what its worth. Most STi's and WRX's here even with a 20G don't hit 12's (mostly driver error) Fastest Stage 2 STi time I have seen in all the 5 years they have been here locally was a 13.25 ET at 98 mph.
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Old 05-12-2009, 06:56 PM   #14
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Not to sidetrack, but can we expect a separate write up on the HTA Green car? That graph looks awesome, and I'm definitely a fan of this turbo so far. Interesting to see it on Cobb's dyno too.
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Old 05-12-2009, 07:03 PM   #15
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Yes. You will see this. Actually, this Green is the 'A' in the test. I will use it against the 'new' one later. It was meant to be a teaser post for a future test in a separate post. I was just really impressed with the results.

Thx.
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Old 05-12-2009, 07:50 PM   #16
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Yeah, can't wait to see.
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Old 05-13-2009, 09:24 PM   #17
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Can someone with this turbo please measure the inducer and exducer diameter? I want to know how the compressor compares with other turbos.
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Old 05-13-2009, 10:37 PM   #18
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Quote:
Originally Posted by Silverpike View Post
Can someone with this turbo please measure the inducer and exducer diameter? I want to know how the compressor compares with other turbos.
many have asked in the other thread with 20+ pages... don't think someone will do it now.
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Old 05-14-2009, 12:08 AM   #19
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most likely not, and they wont sell just the wheel, i assume is a 68mm exducer, and you could roughly measure the inducer with without taking the compressor cover off
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Old 05-14-2009, 12:21 AM   #20
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Quote:
Originally Posted by seanathanq83 View Post
most likely not, and they wont sell just the wheel, i assume is a 68mm exducer, and you could roughly measure the inducer with without taking the compressor cover off
Are you sure they won't sell just the wheel? Did they say so?

I am asking because I am thinking about putting the wheel in another turbo. Hence, the dimensions are relevant. It can always be machined, but I'd like to know it's base dimensions to narrow down candidates.
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Old 05-14-2009, 12:36 AM   #21
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well i have not been able to track it down, i am pretty sure its a 68mm exducer just like all the other 16,18,20g wheels, becuase thats just how they number the compressor wheels, if its the same size as a 20g, which it looks like from the power numbers i would love to have one, i have a vf37 with a 20g wheel, and the HTA is basicly the same as a billet wheel, lighter, and the 7/14 blades allows for better flow
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Old 05-14-2009, 12:54 AM   #22
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Quote:
Originally Posted by Silverpike View Post
Are you sure they won't sell just the wheel? Did they say so?

I am asking because I am thinking about putting the wheel in another turbo. Hence, the dimensions are relevant. It can always be machined, but I'd like to know it's base dimensions to narrow down candidates.

FP won't even upgrade other turbos
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Old 05-14-2009, 01:04 AM   #23
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Quote:
Originally Posted by penusai View Post
FP won't even upgrade other turbos
actually they will upgrade garrett turbos, and a few others, they will also sell their sacred td06sl2, but if we could get dimensions it would be a good starting point, thinking a precision billet wheel would do the same, wonder if they make one small enough to compare to this FP one
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Old 05-14-2009, 01:16 AM   #24
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Quote:
Originally Posted by seanathanq83 View Post
actually they will upgrade garrett turbos, and a few others, they will also sell their sacred td06sl2, but if we could get dimensions it would be a good starting point, thinking a precision billet wheel would do the same, wonder if they make one small enough to compare to this FP one
i'm talking about upgrading, 16g, 18g, 20g...

but i hope a mod comes in here and deletes this post and others not pertaining to the point of John's thread here.
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Old 05-14-2009, 07:24 PM   #25
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Ok guys 2.0L TESTING!! 91 OCTANE STOCK Boost Control

The car has a stock 2.0L motor and a TMIC on 91 Octane gas. The timing is 9 deg tapering to 17 at redline. 11.2AFR Under load.

This is an apples to apples test. I took a 2.0L GC Swapped car and pulled the EVO III 16G out and dropped in an HTA 68. I pulled 4 degrees from the timing map from 1.7 - 2.3 @ 2200 - redline. I then got the boost close and this is the result. The fuel maps are basically the same(OL/CL delays changed. I wanted to keep this as close as possible. The one chart does not go to redline b/c the cluster in the car is the JDM one and the customer did not want to rev it out last time. I was able to talk him into it this time. I can not wait to see what this car will do with race gas or a bit more boost. Thanks for waiting!!

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