Hey guys. I know the unichip is not tuner ready and it comes preprogrammed to plug and play. So my question is, do they ask you about all the modifications to your car? Or is it a cookie cutter chip? Reason being that I am getting the APS ST with a APS Plenum and intend to do full exhaust work. Haven't decided brands or what sort of cats etc to go with yet. But, I would imagine that adding these things and having 93 octane pump fuel would mean that my unichip should be programmed for such. So will APS be sending me a chip ready for an open exhaust and the plenum? Or do I have to find a unichip tuner?

~Josh

 

you need to find a unichip dealer. I am in the same situation. You should be fine with the plenum, but the exhaust - mainly test pipes in my situation- will lead to higher boost levels than the unichip is tuned for. Being the ST kit eliminates the test pipes, you may not have as much of an issue with this, but I will still get it tuned.

 

You can run with the preprogrammed map as long as you would like with no issues... I put over 9000 miles on my kit before tuning it and they car always ran great... I was running cat pipes, dual exhaust, etc... If you want to benefit even more, then it would be good to get it tuned.....

 

The Unchip comes factory programmed...and is not mod or car specific. It really depends on the state of your mods, the current level of fuel trim your ECU is experiences. The only way to know if you need tuning, is to run it on a dyno and check. Some of the APS kits run very rich out of the box...so some breathing mods might actually help the situation.

 

This is a direct quote from Peter to someone running no cats on the APS TT.

 

you ran cat deletes (test pipes) on your aps out of the box tune? What PSI were you hitting?

 

Yes I did and was only hitting about 7lbs... I was running the base 91 map... Not sure if the others that are seeing 10lbs are running a different base map...

 

Hmm alrighty then. I intend to put the thing on a dyno if just to get a messure for the HP numbers. We'll see how the boost is and if I need to I'll take it into one of the dealers. I will probably bring it in anyhow damnit I can't wait

~Josh

 

I think I am the only one that is getting 10 PSI out of the box lol....maybe the Injen exhaust is that good lol

 

Tony is getting 10psi out of the box with test pipes and nismo exhaust.

 

The APS twin turbo system with stock Nissan cats will produce approx 8 to 8.5 PSI turbo pressure out of the box with just a good free flowing exhaust system - if you fit APS test pipes then the boost will increase to approx 9.5 to 10 PSI.

With APS test pipes installed the state of engine tune should be thoroughly checked to ensure the AFR is not too lean and the ignition timing strategy may need further retard to ensure safe engine operatiopn (no detonation) hope this helps.

Peter

 

peter, i bought the single turbo from the GB, im thinking about putting a boost activated cutout in the exhaust, so i can keep the stock exhaust but to make it so there will be zero back pressure when im at full boost, any thoughts?

 

I would prefer a good free flowing low back pressure exhaust system on the APS single turbo system - the exhaust note with a TD exhaust is just awesome imho.

Peter

 

so are you saying no on the cutout and get an exhaust? or are you saying the cutout is best? sorry for the hijack.

 

Over here too.

Does the Unichip modify the signal from the O2 sensors, and does it come pretuned for running no cat?

If not:
Will the APS cat, or a cat of my choosing fit where I have the arrow pointing so I can plug in my O2 sensors? Will they reach? Besides that, will the sensors be too hot from the turbo in this location?

I'm concerned about this stuff b/c it's been said the 05's are more picky about running no cats...

 

so once my aps tt is installed having no cats and a full open exaust on 93 octane and completly stock internals, i will probally have boost spikes and need to get the unichip retuned?

 

There are no boost spikes, it's just the the boost is higher if you have no cats vs. cats because it is less restrictive.

 

oh ok...is there something else that causes boost spikes then? My same question remains tho, having stock internals ill need to get retuned to run safely?

 

I believe one of the problems with the Greddy TT was there was boost spikes due to the wastegate or the eManage? Not really sure. With the APS, I've never heard of the problem. If you have test pipes, you will definitely need to get tuned. Stock cats, out of the box, you should get it retuned, but you should generally be safe. I haven't had a chance to tune yet, and I'm running stock cats and Injen exhaust (9psi), stock internals, no problems.

 

ok thanks for the help...other or new info greatly appriciated.