I recall someone had posted how far he upped the boost on his APS TT on stock internals with dynos and A/F ratios being correct even on mutch higher boost than stock. I couldn't find the thread however.

 

Umm... there are dozens of people doing this.

 

Waht do you mean by stock boost? 8psi? I'm running 10psi on the APS TT, Labree testpipes and APS TD exhaust on the stock block. 450rwhp.

 

OK, so what is the experience? Can the APS TT be run on higher boost than stock (8 psi)? Does the Unichip adapt fuel and timing correctly?

I know for sure someone had posted his dynos with A/F curves...

 

it can be done if you have a unichip dealer tune it up higher than stock - probably having a better exhaust will help you do this

 

This exactly is my question - how mutch boost can you safely run without a re-tune of the unichip?

Madelinot are you running your 10 psi with a re-tune or with the original Unichip tune by APS ?

 

Simply replacing the exhaust and downpipes with right away give you 3-4 psi more. It did on mine. Althought the tuning was okay at that level, I had it retuned.

 

Simply replacing the exhaust and downpipes with right away give you 3-4 psi more. It did on mine. Althought the tuning was okay at that level, I had it retuned.

 

Simply replacing the exhaust and downpipes with right away give you 3-4 psi more. It did on mine. Althought the tuning was okay at that level, I had it retuned.

 

The unichip is locked in. When you go to a Unichip tuner...he can unlock it and raise boost for you. It's all a part of the tune..you can't do it yourself unless you switch to a freer flowing exhaust, in which no one has any control over...

 

double post

 

don't you need to retune the unichip to get any more boost than stock? I wasn't aware that just anyone can flip a switch and get more boost. The only way I see it happening is changine the exhaust or cats or plenum. Even then, I'd get a retune since your engine's life is in your hands

 

I don't think either that the boost level is controlled by the Unichip. I figure it is simply wastegate set, therefor you could use a boost controller to raise it. There seem to be some misunderstandings here...

 

been trying to edit my post for 5 min now - laggy forum

anyway you can increase boost by changing the cats, exhaust or intake manifold/plenum, but you still probalby want to retune anyway since your engine's life is in your hands - don't go cheap on this stuff if you're going TT

 

I believe boost is controlled the Unichip...

 

13 psi with 100 octane tune. I believe boost is controlled by Unichip also. Do you mean you want to manually set the spring for more boost without having to go to a Unichip tuner? As already mentioned that would be very risky. Are you far away from a Unichip tuner...is that the problem?

 

I mainly wanted to learn if the Unichip is programmed/capable to adapt fueling/timing for more then the "stock" 8 psi.

If the Unichip controlls boost it must have a solenoid in the wastegate actuator line.

 

A general rule of thumb is that around 9 psi (this can be argued for what the max safe boost is, so that is why I say around) is safe w/ a A/F ratio of < 12 under load w/ 93 octane. You can boost higher, but need to prevent detonation. Your internals don't care about what pressure you are running, all they care about is the stress they are under (so a really high hp or pre-detonation or high heat).
So the list I can think about to run a higher boost safely is:
- Higher Octane w/ Tune
- Water/Methanol Injection w/ Tune

Notice how I put tune on everything! Also, you can increase your boost by a tune, separate boost controller, or doing something like removing your cats. Be warned - don't do a mod without knowing all the concequences. The best advice is to go to a high performance shop and talk to them about your goals.

 

[QUOTE=zman1910]The unichip is locked in. When you go to a Unichip tuner...he can unlock it and raise boost for you.[QUOTE]

ok..so we agree in one way or another that the boost can be upped by either switching to a free flowing breathing mods (exhaust/plenum) or by tuning the unichip...however..i have always wondered..is it possible to down the boost,,to lets say 6 PSi?
thanks

 

The Unichip is definately able to be programmed to adapt fueling / timing for more than "stock...out of the box" tunning map ( of course by a Unichip tuner ). If your asking if it would do it automatically....no. That is why Peter from APS suggests that after APS T(T) install that any "breathing" mod ( i.e. exhaust, cams ) be followed by a retune on the dyno. Where in Germany are you ? I lived over there for some years growing up? Are you in the service? If you still have questions there is another fourm that Peter from APS is able to post on. You could P.M. your questions to him for answers about his product...