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Old 11-02-2001, 12:30 PM   #1
hkwan
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2005 WRX STi

Default TurboXS Unichip!!

I am kind of surprised that no one has done a review on this bad-boy.

Here we go -->
Set-Up: Engine wise, I have the silcener removed, ITG filter, stock exhaust, and now, the Unichip. I had the Joe P. MBC installed prior to the Unichip. Using CA pumped gas - 91 Octane.

Installation:
Literally a snap. Just snap off the stock harness and snap on the Unichip. The biggest PITA is re-installing the factory kick-panel top mount onto the TurboXS "J" bracket. Took me like 20 mins and still could get the supplied bolt and nut back in. I gave up, didn't put the screw & nut back in. Anybody, please let me know if that's going to hurt anything because I ain't going back in there!

Suggestions:
It would make life much easier if the "J" brkt is pre-tapped with threads and the screw is an allen screw instead of the phillips screw - easier to hold on to.

Driveability:
at sub 3000 RPM, definitely drives like stock. Otherwise, very smooth throughout the power band. Comparing to the MBC, Unichip has no hestiation when I slam on the gas pedal in 4th or 5th. I believe the hestiation comes from the stock ECM dumping gas into the engine due to the increased air flow. 2nd & 3rd gears pull noticeably harder than the MBC set at same boost level (~14.x psi). 1st gear, feels like it pulls smoother, not necessary harder comparing to the MBC set at same boost level. 4th & 5th gear, the Unichip runs at a higher boost level (~16.5psi vs. MBC's 14.7 psi) than my MBC. I notice a very slight increase in engine noise under acceleration.

Supply:
Very nicely written sets of instruction. Top grade material, top grade workmanship - PCB, stand-offs, harness, etc. Very nicely thought out hardware supply for fitment of the unit.
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Old 11-02-2001, 07:10 PM   #2
jclick
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Default

So did we get the same boost maps as everyone else in the country? I don't have my gauge hooked up yet. I am waiting for my pod.
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Old 11-02-2001, 07:16 PM   #3
hkwan
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I asked Phil what is the difference b/w the CA program from the others. He indicates that the timing is pulled back a little. I don't believe the boost is any different. Fuel could be a tad richer. Of course, TurboXS can add to what I know here.
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Old 11-07-2001, 08:42 AM   #4
Tex-WReX2
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Default bracket solving problem

I, like you guys, was tired of the nut dropping down onto the ECU. After 20 mins of watching what I would call " a monkey trying to f uck a football" I had a vision. Ok, not really, but my engineering degree paid off. Went to the work bench, cut a piece of duct tape, secured the bolt in place(taped it to the back of the bracket), facing up, reached back in there and placed the nut on and was done. I then just moved the plate a bit to align the rest of the extension screws. Done.


Hope this helps.

John
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Old 11-07-2001, 08:56 AM   #5
Sergeant_V
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Quote:
but my engineering degree paid off
LOL!
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Old 11-07-2001, 12:09 PM   #6
Tex-WReX2
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Sergeant_V, you get your yet? Didn't you say you were on the list ?

Later

John
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Old 11-07-2001, 04:11 PM   #7
WRX-U
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Talking The Shiznit....

I am glad that someone finally commented on this chip....I am very impressed with this product, I picked up my Unichip from TurboXS yesterday and installed it in all of 20min (30 if you include having to fiddle with the restrictor hose). The chip is just like the title of this post "The Shiznit", for all of those people leary of spending $700 on this peace of art work, GO GET ON THE LIST and get one! Take my word for it, this is probably the best bit of money you could spend for your baby/WRX. I am not trying to say that no one such as Cobb, or Metric's chip isn't a good product, I am just speaking from my experience, and for the money you can't beat it.
Fortunatly I am only a half an hour away from TurboXS, but the greatest feature of the Unichip is the tunability, (not to mention it comes out in a jiffy, for those worried about SOA) any thing you do to you car, the Unichip can be retuned farely easy.

The perfornance side of things has already been explaned from the above reviewies, but to sum it up this Unichip really makes the car perform like it should of from the factory...Like the "Rally inspired WRX"

Thanks for listning, ~ Brian

P.S. I am not an english major so please excuse the spelling and run on centences.
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Old 11-07-2001, 04:25 PM   #8
Sergeant_V
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Quote:
Sergeant_V, you get your yet?
Should be seeing it shortly. I believe mine is shipping on the 9th (fingers crossed). Needless to say I'm pretty anxious. Thanks for the helpful hint Tex. That and hkwan's write-up will make the install that much quicker.

-V
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Old 11-07-2001, 05:02 PM   #9
hkwan
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After close to a week's driving, here is what I've notice:

1) Performance - the car got faster than when I first installed the Unichip. It is definitely NOT in my head. The car is actually faster. I don't have any numbers to show, but right when the needle hit a little below 3000rpm in 1st - 3rd gear (especially in 1st & 2nd gear), there is this "kick" that I didn't notice after the first couple of days of installation. The "kick" is like someone has bumped their car into your bumper from behind. Some say it is contributed by the stock ECM's learning/adapting to the new chip.

2) Boost spike - there is another thread in the Factory Forced Induction Forum that discusses this in length. I do notice, in 4th & 5th gear, that the boost level goes to ~18.X psi when I floor the gas under 75, 80mph without downshifting. Some has done the needle-valve mod (discussed in that post) that controls the spiking, but I'd want to hear from Mark from TurboXS directly before I proceed with the modification. Couple of us, including myself, have emailed Mark with the link to the boost spike with Unichip post, but am rather surprise Mark has not come out to give his valuable $0.02. Usually he is very responsive.
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Old 11-07-2001, 05:09 PM   #10
Sergeant_V
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Quote:
but am rather surprise Mark has not come out to give his valuable $0.02. Usually he is very responsive
He's probably packing up a large batch of chips and harnesses (fingers crossed)!

-V
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Old 11-07-2001, 05:16 PM   #11
WRX-U
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Thumbs up Boost spikes

Yeh I was there yesterday, and they are very busy...So Mark hardly has time to do much of anything it seems. But they both told me that thier high performance MBC helps alot with the boost spike problem if you set it at around 17 psi. I actually saw the dyno plot.

~Brian
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Old 11-07-2001, 05:21 PM   #12
hkwan
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Yep, almost any MBC will work in controlling boost spiking. Problems with MBC is that it will allow the boost to max out even at partial throttle. Not good. With the Unichip set up running with the supplied blue restrictor tubing, the boost don't max out unless you are hard on the gas pedal. If I were to go with the MBC, I'd rather go with the needle valve mod. For reasons that it is easier to tune and cheaper to obtain.

WRX-U, what does the dyno plot say on what type of mod set-up?
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Old 11-08-2001, 12:40 PM   #13
WRX-U
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Default Dyno

Hkwan, the dyno that I saw was a comparison of the stage 1 kit WRX with Unichip and their High Performance boost control set at 18psi and 17psi, by having the boost controler set at 18psi the turbo is doing to much work. With the boost set at 17psi the car made 215whp.
My understanding is with the restritor hose, Unichip, and MBC set at 17psi this is the best combo. Please correct me if this does not make sence.
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Old 11-11-2001, 04:59 PM   #14
bayWRX
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I also have the Unichip and their HP MBC. So are you saying that the best combo to have would be their MBC to control spiking + restrictor hose to prevent full boost at partial throttle + Unichip? I am finding that even with factory boost controller and blue restrictor hose that with partial throttle I am getting alot of boost not much different than with a just the MBC w/o unichip.
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Old 11-12-2001, 12:23 PM   #15
hkwan
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bayWRX, the Unichip should be less sensitive to full boosting with partial throttle relative to the MBC. With the MBC, I can just engage throttle 1/4 way and the boost will slowly build up to full boost level. Unichip keeps the boost at certain level and not allow full boost. Now, you are correct, seems like if you have the throttle past 65%, Unichip still allows full boost level to be obtained.

There is a post already in the Factory Forced Induction forum titled "Boost with Unichip". Please go there for this sort of discussion. Many more experts is engaged in that post.
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