Hard to say what is going on with your car without looking at the dyno sheet or test driving it ...
It could be almost anything.

But any time you change or alter something in the power train you are going to affect everything else as well.

Your car might benefit by the back pressure caused by the cats.

I had PPE long tube headers with no cats on my car ...
That combo created an easier exhaust flow with a smoother scavange, but at the cost of increased loudness, emission odors, and perhaps a little drop in torque.

With the tune - my car did have a pretty flat torque curve which all but eliminated the flat spots during acceleration.

Hope this helps...

MIKEY !!!

Were you on the COG pulleys at this time ??? Other issues ???

Test pipes will cause you to lose some boost pressure in the cylinder. We have seen around 10-20 whp losses with HFC's and Test Pipes.

I was running HFC's with my Stillen SC and recently went back to the stock cats, results are much better now. Car is running great.

will this change with your high performance kit being tested or will it be better with HFC's/test pipes with higher boost levels from the supercharger?

Hey BOB! Negative man, The dealer screwed those up too bent sh^t and what not. But I think it was better cause I would have gotten ZERO days of driving it before it popped, at least I got 3 days out of it. :/

Trying to get another SC kit , with No heat exchanger or tuning, . Just the kit and a trans cooler, that's all I need. Along with a place it install it :excited:

I don't even o to that dealer for oil changes LOL, I wouldn't let them plug a tire on my car. probably for get to bolt the wheel back on or break a stud ;/

The Stillen kit is awesome, just don't go outside of all their recommendations like swapping the Impeller and running Test Pipes. With all the basics and a good tune you're going to enjoy it.

My current setup consists of the Stillen SC with the supplied 600CC injectors and stock MAF with a 9PSI pulley. I added the 25 row oil cooler and currently running the stock cats with a Meisterschaft Catback exhaust.

I won't do anything else except swap the injectors for 1000CC with UPREV GT MAF and a re-tune but that's as far as will go.

Really have to watch the AIT at the manifold, it goes up really fast even if you're messing around. After the car is warmed up (heatsoaked), it can go up 30 degrees during quick 2nd gear pull.

I can see why people are blowing motors during drag races. Too much heat causes detonation. Can't really push it when it's hot outside otherwise you're asking for trouble. If you don't have a vented hood, sitting idle or just turning off the engine will bring the AIT's up beyond the heatsoaked temp. I am seeing around 140 degrees when the car is warmed up. Oil at 180 and trans at 180.

Need to vent the hood or upgrade the heat exchanger.

100% right, I had both :tiphat:

I pushed mine all day yesterday with the temps and humidity in the upper 90s and it never missed a beat. I do have meth injection but it was acting up so I didn't use it at all.

I think if going with a bigger/more efficient heat exchanger makes you feel better or make a difference (I haven't seen documentation so I can't say for sure) there is no danger in that mod. You're not changing anything to add pressure or stress to the system.

We will be test out our high boost kit soon and will see what the limitations and issue are with the kit as is. If the heat exchanger proves to be an issue we will include one with the new kit or offer it as an upgrade.

Hey Mark,
There is actually I thread on here where it showed more WHP with the frozenboost heat exchanger, it was one of the euro guys VLAD!
He did runs without it and runs with it, he had gains thought he power band .

Hmmm maybe when I swap injectors/UPREV Sensors I will add this as well. More cool never hurts :)

Interesting, do you have more info. about the new kit ?

I can't find it :(

Why not offer it with the SI impeller ($365) and the 8 psi pulley? 2-3 psi gain at the same rpms. What do you gain from changing out an 8 psi pulley for a 9 psi pulley? 12-15 hp?

yeah this is not what I was hoping for haha.

I was thinking an upgraded blower/E85 compatible fuel pump/injectors at a minimum

You think I should go back with HFC? i do have a 3" a am exhaust. I don't know what to do!!

Thanks man! I guess I will try some HFC. Recommend any? I have the AAM 3" exhaust that helped a lot. When I changed the HFC to test pipes it felt different .

he's saying with the stillen supercharger kit, it works better with more back pressure, so going from test pipes to HFC probably won't make much difference, the 3" exhaust won't be helping with this either, but remember, don't judge your dyno numbers vs other peoples, every dyno is different and will read different figures.

the only way you can truely measure your gains is on the same dyno and roughly the same temperature during your runs, you would need to do some before and after, but again the money you spend to change parts, probably isn't worth the HP you MAY gain, there is no guarantee.

infact you'd be better off;

adding oil cooler if your temps are too hot
adding larger heat exchanger if your temps are too hot
adding water/meth kit to either aid as a safety or increase timing
adding fuel pump/injectors to suit E85 and re-tune if it's available in your area

they will yield better results then changing your exhaust without wasting money.

Hey Mark ,
Post 34 :).

http://www.the370z.com/forced-induct...om-tune-3.html

I would take a look into motion labs thread also I know everyone's numbers are different but they tunes your kit with the impeller upgrade . Say they made 484?
http://www.the370z.com/tuning/71056-...illen-s-c.html

We have not really considered the impeller upgrade as it would no longer be a simple bolt on upgrade for the current STILLEN Kit. We like to make products that will be safe, reliable, and are pretty straight forward. If we feel there is enough of a demand for a more extreme (call it stage 3 or 4) upgrade with a different compressor wheel and completely different fuel system we will look into it.

You should go back to stock cats if you are running the STILLEN Kit. I would highly recommend stock cats. High flow cats are more likely to blow out and you will still only make a little more power over test pipes. Stock cats will get you the best power.

Thanks Mike! I will be going over this with our tuner and engineer.

so it still isnt going to do 500 out of the box?

Sent from my HTCONE using Tapatalk

500 whp is very unlikely for the high boost kit. We may look into developing another kit that would shoot for those kind of numbers but we have not looked into that far. Simply creating a kit for the high boost pulley that will be plug and play is our first priority.

500WHP would be nice but man over 400 is a blast for daily driving. I am sure anyone making over 400 RWHP would enjoy it.

Very interested in the new stillen kit. Mark when will you have more news and information on the kit? Hell I'd be happy making 450!!

We are still in development. There have been some delays as we are slammed in the shop right now and haven't had a chance to finish the testing on it. We are hoping before the end of the year.

I sent a message to Stillen asking what the coolant capacity of the intercooler/cooling system is. The responder said he did not know the capacity. Can anyone here tell me what it is?

Thanks

Is there a particular reason you need to know? I can check but it is pretty much a fill till it's full system.

I wanted to add Motul MoCool to the SC cooling system. It calls for 5% mixture of MoCool to coolant. Surely a manufacturer would know the specifications of their products?

I used Water Wetter, just mix it before you dump it in. It's 6.4 oz per gallon.

yea, easy to do before hand but the coolant is already in the system. I really don't want to drain it all and start over.

Ok that makes since, do you know how much you have in it?

Does it freeze in Houston? If not, my car runs much cooler on distilled water and Water Wetter. I use it in the supercharger and radiator.

i guessed the coolant capacity was around a gallon so i put 6oz of wetter in it

I think its a little more than that but you should be good.

I checked with the shop and they said they use 1 gallon and have a little left over. The 5% mixture does not need to be 100% accurate. Calculate what you need for 1 gallon and add a little less than that. I will try and found out the exact capacity but it might take some time.

Is there any possible way this new kit will retain the stock manifold? I would be all over this ..