SoarerCentral: Uni chip application with forced Induction....

SoarerCentral General Soarer Chat Uni chip application with forced Induction....

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Mike Beck
Goo Roo
New Zealand
Soarer JZZ31 I6

Posts: 1943
Reg: 11-2005

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Friday, April 11, 2008 - 05:26 pm, by: Mike Beck (Gold_40gt)

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Recently I was talking to the key man at a Garage in Auckland that is the only Uni Chip installer as far as I know. They dyno tune them and all that as well as deal other auto electrical bits and pieces.

I was discussing with him if a Uni Chip would be a decent solution to get a reasonably good tune with my supercharged 2JZ soarer once its completed, with supporting mods such as intake and exhaust too.

He says they can be used on a 2JZ no problem, but what I was most interested in was that he said it would not a great idea using a uni-chip on a low boosting Supercharged or turbocharged 2JZ as in his words 'you would never get the tune just right.... it would always be a bit off' And recommended that it would be most ideal to go for a full stand alone system, forget the brand he mentioned. He said it would work but just wont be quite right....

However, from what Ive gathered with the V8 guys and their supercharged Soarers, Uni-chips fitted to those have given a big advantage and allowed for more boost. Easily worth the money therefore.

So would it be most logical to still go for a Uni-chip on my project to get it running at more safe fuel ratios etc, as a start Ill be running 5.5 Psi which should run with out any ECU tunning like the V8s tend to with the same s/c, shall be interesting to see how they compare... but once any other issues have been worked out Im changing the pulley to go up to 7psi which is what I preferably want it set at making it more desirable and probably need for a a/f and ignition tune on the dyno.

Really I think it just comes down to the Money figures to how well each device performs, Uni chip fitted and tuned is around $1400, the Stand alone system almost $3500, so theres a big difference in that sense.

Im sure Uni-chip will be the way to go even still, anyone got their thoughts on the issue?

David Vaughan
Goo Roo
ACT
V8 Ltd manual

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Friday, April 11, 2008 - 06:20 pm, by: David Vaughan (Davidv)

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What did he say would be wrong? A Unichip is a programmable piggyback adaptable to whatever profile is needed based on dyno evidence. I see no obvious reason why its profile might not be matched to forced induction, which is only more air. Did the alternative cost more, by any chance?

Cihan Aday
Moderator
www.etuner.com.au
JZZ30

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Friday, April 11, 2008 - 07:19 pm, by: Cihan Aday (Cihan)

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Mike, the unichip's limitations become apparent when you step up the boost and start to look into bigger injectors ETC. The reason is that you're stuck with simple MAP sensor signal manipulation to trim the extra fuel, and, there is a 7.5degree limit to the ignition you can add or trim before experiencing an ECU error code and subsequent limp home mode.

Another problem is the fact you can't actually add more fuel than the factory ECU allows. So, if maximum the factory ECU is programmed to run is %80 duty cycle, then you can't add more than that without a fuel pressure reg, or larger injectors.

Forgive me for 'selling' the Emanage Blue, but i think it will suit your needs much better; Especially when you decide 5psi isn't enough.

Mike Beck
Goo Roo
New Zealand
Soarer JZZ31 I6

Posts: 1945
Reg: 11-2005

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Friday, April 11, 2008 - 09:15 pm, by: Mike Beck (Gold_40gt)

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Cihan Aday wrote on Friday, April 11, 2008 - 07:19 pm:
Another problem is the fact you can't actually add more fuel than the factory ECU allows. So, if maximum the factory ECU is programmed to run is %80 duty cycle, then you can't add more than that without a fuel pressure reg, or larger injectors.

Ah yeah thats right, he also mentioned that, it can be difficult to add fuel into the system. Need to look into it when the time comes though.

At 5.5 or where abouts it should theoretically run on the factory ECU with an upgraded fuel pump, I've see NA-T supras basically the same, accept turbo running 8-11psi with factory ECU/Injectors/HG so dont see my quite small 5.5 trial psi level being too much of an issue. Be wise to get a dyno run to see what the A/F ratio to get more of an a picture of whats happening though.

In regards to the projects progress I'm almost there parts wise,

Only left to receive is the Pulley Boys Quick change pulley kit Ive ordered from USA...

I'm currently having the Intake manifold the S/C sits on started sorted out tomorrow and continued into next week. Left to fabricate after that are the brackets for the Intercooler & Fan, and importantly the tensioner which will require a fairly heavy duty custom bracket, taking up some of the battery space so that will be relocated to the boot in a box with a decent grade cable and fuse etc. Once thats sorted the easy part of getting some lengths of S/S pipping with the vacuum line connections made up to the plans plus a number of clamps and silicone joiners/reducers Ill need to buy....

When the S/C is ready to be bolted on with the new manifold Ill be looking at removing the factory bonnet and putting the modified one put on very soon too, at the moment will only feature a tidy large cut out so the s/c will have clearance and stick out. Should look quite interesting! later the Fibre glass/Steel reversed swooping scoop will be sorted though.

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