Are any or all of these turbo kits street legal?

 

If you mean emissions legal, I don't think that any of them are.

 

Street yes, Emissons no - as of now. The APS TT they are working on. Peter APS is keeping us posted. It's on another post.

 

The only thing about emissions is air being let into the atmosphere before its combusted, like a blow off valve. And then a open wastegate being vented into the air and not going through the catalic converter. I think thats it.

 

For emissions you mean in states like Cali that have the CARB right? I'm in NY and we have emissions. Will these kits cause a problem?

 

is APS planning to get this turbo kit CARB legal? im planning to make my own turbo kit.. a single turbo that uses stock exhaust manifold and is easy to remove

 

Yes APS is planning to pursue CARB on the TT kit.
However; JWT's TT kit will prolley be the first to actually obtain an EO#.

 

what's the difference between street legal and emissions legal? If you don't have CARB exemption it ain't legal (at least in wonderful california )

Is it even possible to pass emissions with a BOV that vents into the atmosphere?

 

In Cali , running a non-CARB approved FI system is in effect "not-street legal". Most states only require a sniffer test with no visual inspection.
In Cali we have both. So, you could pass the sniffer just fine and still fail the visual (or vise versa, or both). To be "visually legit" you are supposes to provide a valid EO# for the installed kit.

 

thank you.

Now what about the BOV question: Is it even possible to pass emissions with a BOV that vents into the atmosphere?

 

Yes as long as the BOV does not vent into the atmosphere during the loaded sniffer test. The basic test should not load the chassis enough to produce boost , so as long as the BOV doesn't leak or at least vents back into the intake ,during the test, it should be OK. Note the APS TT system uses a two stage BOV. Under most throttle releases under boost it will act as a bypass valve (not atmopheric). It will only fully vent (atmospheric) under a high boost dump condition.

 

good info, thank you!

 

How about having a built bottom end as well as changing the engine compression for a TT setup, will that automatically make you fail a sniffer test? Doesn't each make and model of a vehicle have baseline values the smog tech uses? Or does every car uses the same pass/fail values? Life is tough in CA!!

 

You'll make it through a sniffer test, I agree. But a kit using a BOV that vents to atmosphere under any conditions is not going to make it through the ARB certification process. Nor will the ARB folks take kindly to modified fuel systems or any tweaking of the stock ECU programming.

One of the long time providers of turbo kits to the Supra community has been working for close to a year now on a smog legal upgrade for the OEM turbo equipped MKIV. When asked about upgrading and ARB certifying the fuel system his reply is:

 

Lowering the static CR can be made to pass the sniffer, depending on other variables. The OEM CATS are enourmous overkill and can celan up quite a lot. If you don't disclose the internal mods to the station they won't know that the SCR is lower, nor will the ECU (from a code perspective) as long as you don't go crazy low on SCR. For example with 8.5:1 cr pistons, the ECU on a G/Z does not throw any CELs to the best of my knowledge. Alterations such as Forged and lightened componets have little bearing on the testing, but still should not be mentioned to a tester.

 

WRT " a BOV that vents to atmosphere under any conditions".
For example take the APS dual stage BOV. For testing it should be quite simple to force the BOV into "bypass mode" 100% of time , in order to obtain an EO number. It then is up to the user to open the BOV for "off-road use" only JWT uses only a bypass.

WRT "modified fuel systems", there are many degreess to this. For example I
have a fully CARB approved SC system on my Dodge truck. The mods to the fuel system altered the fuel line and added two bank fired aux injectors, controlled via piggyback ECU.

 

I do not understand how/why a BOV could effect emissions since it is only compressed air. There are no unburnt exhaust gases being expelled. Luckily I have never had to deal with emission testing either here in VA or in PA.

 

actually to the CARB it's not "only" compressed air. The crankcase vent enters the tract prior to the BOV (prior to the compressor). So it is therotetically a possible path for cranckase gases to escape via the BOV as opposed to ingestion by the engoen as intended. Crankcase gas is nasty stuff. Remember long long ago the function of a "draft tube".

 

Also, it depends on the location of the BOV in relation to the MAF Sensor. Any thing that alters what the MAF sees is a big NO NO on the eyes of the emissions police.