Adding throttle to start car after stillen SC install
 

I just got my 09Z back from the shop after the clutch (ACT stage 3 with stillen lightweight flywheel) and stillen supercharger install and really hate how I got add throttle to start her up. I told the tuner I had no starting issues before the install and tune, so it must be something he did (don’t get me wrong, very nice knowledgeable guy).

He told me because the car is running at 481 WHP (refer to graph) and running a little on the rich side, I should add meth to regulate the fuel and get bigger intercooler because of the stock intercooler size and bumper design then he can retune her again and fix the issue. I am running 1000CC injectors and walboro fuel pump, the kit has upgraded cog and the supercharger has upgrades internal blades pushing around 12.5psi. Other mods I have are berk HFC , berk CBE and AMS headers. Any ideas on this guys? thx

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I should mention that the car is running little rich and therefore extra heat, which is why he is telling me to get a radiator, car is running much hotter than before.

You need a new tuner. The heat exchanger and radiator aren't a bad idea. His reasoning for adding meth doesn't make sense to me. I wouldn't let him touch the car again. The starting issue is unrelated to any of the parts he's trying to sell you.

No meth kit I have ever seen is spraying at start up and cooling isn't going to change anything at start up so I agree with Chuck, find a new tuner.

It definitely sounds like Chuck33079 and JWillis72 are correct about it being a poor tune causing the problem, but I'm no expert. With old-school engines (mechanical injection, vacuum/centrifugal ignition advance, fixed valve train, &c), you had to "de-tune" a hi-po setup to get "easy" starting. With everything being computer-controlled nowadays, you can have your cake and eat it too. Your setup seems to be on the "extreme" side, so starting may be a bit more difficult but nothing the ECM can't handle if tuned properly. YMMV

Seems like tune to me too. I thought when a car runs rich suppose to run a little cooler? She is running little rich and much hotter than before (radiator fan always on). I am going to look around for tuners, fu*k been out of thr car for so long now more issues

CFS triple pass radiator will help cool the car down a lot. Did he adjust your fan temps? Did you do a oil cooler? Also a vented hood help get more air through all the coolers. With those changes my car runs way cooler than it did from the factory.


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Not a chance in hell given the quality of his advice and current tune. OP needs to baby that car to someone else and get a competent tuner to make a new map. I would have no faith in anything the original shop did at this point.

Like what chuck is saying also, the tune needs to be redone . Te heat exchanger IMO is a must from the start , and of course it runs rich the stillen tune runs rich out the box I couldn't even start my car on the can tune that came with it . Find a new tuner, one he Inflated your numbers cause the kit will not make 481 WHP and he did that to sell you a bag of goods .
Go else where :/

I may have to disagree with you on the numbers the kit is capable of. I'm at 440whp with the 9lb pulley headers, test pipes, cat back, tuned @ 10 lbs of boost, all but the impeller upgrade so it's possible he might be hitting those numbers or close to it with more boost. Also I'm 7at and he's 6mt so he will loose less through drive train/torque converter

The guy that originally owned the kit was putting down 480WHP with 91 octane and 525 on E85, so I have to disagree with you my man. I called the tuner this morning and told him to break everything down for me on what he is trying to do exactly (I was pissed over the weekend cause I been waiting weeks for the car and when I got it, wasnt running like I was expecting her too).

1) The bigger radiator he explained is due to the heat that's being generated and he wants to save me from buying a better vented bumper.

2) He said the meth is only to regulate the fuel and push more power, not to fix starting problem

3) He did admit to me that he could have spend more time tuning and got it way better, but I been without a car for 5 weeks due to clutch on back order and few other parts so I wanted to car back the past weekend.

Now the guy is offering me to retune the car free of charge (have to leave it there for a day or two so he can fine tune it) and GUARANTEE to fix the starting issue. However, he is advised me to do the radiator and meth all at once too. What do you guys think?

NO!!!!!!!!!!!

RUN!!!!!!!!!!

THIS GUY SUCKS!!!!!!!!!

Clear enough? His reasoning for the meth is retarded. He is not doing a good job tuning the car. Period. Find a new tuner before you join the (surprisingly large) "Stillen SC blew my motor" club. If he can't get the little things in the tune right, he didn't get the big things right. And the numbers the previous owner is claiming must be on the world's highest reading dyno.

The only thing that your "tuner" is right about is the need for a better radiator. Keep in mind, you have to evacuate the ac system before and recharge it after a radiator install.

I'm not going to get into a what the lit will make, I am only speaking from experience and having every upgrade for this kit and running 12 PSI and making 457 WHP. I know all dynos are different some guys will inflate theres' Reason being IMO not to make that much WHP os the motor wont last I only had mine for 3 days and BOOM,( Not the only one) Point is run from the tuner and find another place.

Stillen Kit is Great for what it is,. And that's 420-430WHP an that's all, Again IMO.

Ok, I am going to try to locate another tuner. In the meanwhile, you think I should do the radiator install as well?? I am not going to worry about meth if I dont have too, anything else I should keep in mind while I retune her ?? Thanks a lot guys, this thread been great.

The radiator is a good idea. Skip the meth. Does the Stillen kit come with one step colder plugs? The Frozenboost heat exchanger is a must as well.

I installed GTR plugs as well, I forgot to mention it (i did so much i cant remember anymore). So no heat exhanger comes with the stillen kit?? or it's not sufficient enough?

The heat exchanger from the kit is very undersized and will heat soak in a hurry. Get the bigger one and a CSF radiator and the car will be much happier. The Stillen kit has serious heat issues. This way you're at least taking care of a few of them.

Thanks so much Chuck, much appreciated dude. So you recommending the frozen boost heat exchanger for the kit and a CSF radiator for the car? Also, I know you said meth is not needed, but does it help with regulating the fuel and maybe push little extra ponies LOL.

Meth doesn't regulate jack ****. Meth adds octane to pump gas. You would have to have a map tuned for the meth where it gets leaned out to compensate and you can be more aggressive with timing. You'd gain some power and it would run cooler, but if you have a meth system failure or a clogged line or any other interruption in flow under boost you now need a new motor.

Frozenboost heat exchanger is here :)
Air to Water Heat Exchanger

This is the one I ran and the GTR plugs are a very good idea also. I had the same.

You know what Chuck, I head that "you will need a new motor" phrase so much that I had a spare engine sitting in my garage before touching the one in the car.

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Start building it to hold a LOT of boost. :stirthepot:

hahaha u read my mind, I am already doing some research about it. So much for keeping the car stock after 5 month of owning it.

Thx ANMVQ & Chuck33079 parts ordered and arrived at my friend's shop. I found a another tuner who said to bring the car to him and he will install the parts and lean her out to correct the running rich issue. He also told me the starting issue is probably related to too much fuel dump which he will fix as well. Last question guy, how long do it take to tune the Z properly??? Days? Hours?

My tuner spent a day and a half on mine between the dyno and road tuning.

Mine did also a good 4 HRS, The tuner is right about the starting issue, That and the hot start values are probably wrong :/

Mike took 8-10 hours over a weekend to get it all working right. The bulk of it goes fast it the fine tuning it that takes the most time.


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Yep.

OP, take a copy of the newest throttle map from the thread in the tuning forum and make sure the fan settings are lowered dramatically, both with AC on and off.

I have 1000cc injectors and don't have any issues starting it cold or hot. Tuner needs to spend more time fine tuning it.