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Old 07-24-2002, 11:50 AM   #1
atomicapples
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Member#: 12626
Join Date: Nov 2001
Location: morristown, nj
Vehicle:
02 2.5 rs
silver

Default vishnu unichip vs. turbo xs unichip

currently running...

hks cf/ti exhaust
blitz intake
hks ssbov

coming soon...

hks super afr
hks EVC IV (Electronic Valve Controller) Boost Controller
up-pipe (deciding on either waiting for the hks or just get the vishnu)
downpipe (same dilema as the up-pipe)
blitz front mount
vf34
sti injectors
walbro fuel pump
hks exhaust manifold

so my question is.

which unichip would be best for this setup?
also is there anything missing in my setup?
please feel free to correct me on my setup.

thanks guys

ant
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Old 07-24-2002, 12:40 PM   #2
beobe99
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Join Date: May 2001
Location: Philadelphia PA. USA
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1999 rs/wrx hybrid
silver

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as far as i know there the same chips...i have a turbo xs chip, that vishnu is now tuning for me...they both get the chips from a Company called dastek...

bob
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Old 07-24-2002, 01:23 PM   #3
lstepnio
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Chapter/Region: South East
Location: Tampabay, Florida
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2004 STi (fuxor3d!!)
2004 Forester X

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I really like the idea of some of the additional features TurboXS uses like the ECU controlled boost that addresses part throttle boost unlike the Vishnu.
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Old 07-24-2002, 03:13 PM   #4
Rich10
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Location: Long Island
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WRB

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If you are going to get an HKS Super AFR and an HKS EVC IV, you don't really need a unichip. The only additional thing that a unichip gives is timing control.

Rich
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Old 07-24-2002, 03:30 PM   #5
stimpy
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A Unichip can control timing, boost, air/fuel ratios, and launch control (or some other output). You already have listed plans of things to control boost and air/fuel ratios. No sense in buying the Unichip if you are going to already be using those piggy-backs.

The Vishnu controls boost via MBC and not the Unichip tho. It can be programmed to control the factory boost controller. The TurboXS probably has a slightly larger database of maps to pull from. However, that is only temporary. I think it all comes down to tuning philosophy and implementation of the tuner. The hardware is technically the same.

-Jon
www.nothingserious.net
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Old 07-24-2002, 07:14 PM   #6
atomicapples
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silver

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thanks for the info,

but if the vishnu chip controls the boost

why do they offer a manual boost controller in one of their package (stage 0 ) ?
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Old 07-24-2002, 07:14 PM   #7
atomicapples
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Location: morristown, nj
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02 2.5 rs
silver

Default

thanks for the info,

but if the vishnu chip controls the boost

why do they offer a manual boost controller in one of their package (stage 0 ) ?
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Old 07-24-2002, 09:15 PM   #8
lstepnio
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2004 Forester X

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My guess has been that Vishnu is using the MBC to cut costs on the kit. From my understanding the TurboXS harness has something to do with controlling the boost and the harness adds about $100 to the cost of the UNICHIP. Its sounds like Vishnu will be adding some type of electronic method of boost control to the package to deal with the part throttle boost issues. I'm speculating that Vishnu will be using the same method that TurboXS or BoostMonkey use to control the boost.

edit: I have heard the launch control mentioned in the past and I'm wondering does anyone with a UNICHIP on the 02WRX has this feature enabled? Any details or results?
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Old 07-24-2002, 09:31 PM   #9
Vishnu Performance
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blue & black

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FWIW, we did not use the boost control option for a very simple reason: we wanted to let the user adjust the boost themselves. This would allow them to lower the boost during situations were octane is limited or temps are unusually high. Or conversely, raise the boost when running race gas or when conditions are very favorable. Keep in mind that we use manifold pressure as our boost reference, not TPS. This means that we can tune fuel/spark for different levels of boost in one single unichip calibration file. Cost isn't much of an issue since the optional Unichip driver/boost controller box costs us about as much as the MBC.

Cheers,
Shiv
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