Edelbrock SC Stock Tune with Full Exhaust
 

Just like the subject says, I just installed (actually in the process of installing) an Edelbrock Supercharger. As anyone with the kit knows, it comes with a stock base tune. After the fact, I have a full exhaust on my car. As long as I don’t drive the piss out of it, will I be ok? I don’t want to run super lean and melt my pistons lol. Any feedback would be greatly appreciated. I know a lot of people are running a delicious tune and that’s in the future but unfortunately ran out of funds for now...

The stock Tune is meant for a stock car. I am guessing it would but its gonna run like shit. You spent all that money, find a way and scrape together the extra bit for the flash and go tune.

The only reason I question the whole thing is due to the research I’ve done with just changing the exhaust. “There is normally no need to have a custom tune for mods like exhaust, TMIC or CAI's. The ECU will deal with these mods happily. This applies to mods installed before and after a flash tune. The ECU will relearn any parameters it needs to for proper operation. Experience shows that adding mods normally enhances the tune, as it does under a stock tune. A custom tune is advised for major work such as heads, cams and modifications that may radically alter sensor data fed to the ECU/PCM.”

That’s why I’m wondering if it’s worth it or at least something I can sit on for a while. I appreciate your thoughts and advice none the less!

probably best to get in touch with Edelbrock and ask their advice

however I would say if you have a full aftermarket exhaust then 95% of these flow better with less back pressure than the stock exhaust
as a consequence a stock ECU tune will be very safe on an aftermarket exhaust and should work just fine

it just means that there's power waiting to be had once you do tune it

You need a tune for most of the CAI’s with our vehicles, and you definitely need a tune with a header, so I would definitely expect it to be rough. Additionally, I think almost everyone uses DT’s DBOX w/ the edelbrock kit to make it run smoother. So I would be looking into that as well.

As another said, you’ve already spent so much to get this far. You are messing with FI, do it right, or it’ll definitely come back to haunt you.

You said full exhaust which in my mind means a header as well. If that is the case you need a custom tune.. if you have stock header then the stock/base tune will work

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jflogerzi nailed it

This is like having a baby and then complaining that you have to buy clothes for it. A tune is an integral part of your car's health and performance. If you want your baby to live life naked, it will be sickly, and do terribly in life. But at least you saved money on clothes, right?

I appreciate all feedback a I recognize the fact that I will need to get the tune but thats not what I am asking for in response. I’m asking for opinion on if you think it is safe to drive the car for a few months prior to getting the tune. Anyways, I appreciate all the feedback.

My opinion was no, I don't think it is safe or smart. It's not going to run well, as it is designed for a fully stock vehicle outside of the SC. While this platform responds well to FI, it's still FI, and an additional stress. So I wouldn't risk running it at all outside of having it tuned/remote tuned.

The risk vs reward just isn't there. The risk - blown motor. The reward - drive a poorly tuned vehicle that won't make it feel worth the investment in the SC for a few months.

For reference, I bought my JRSC Kit w/ Oil Cooler back in October, and slowly began piecing together the rest of the parts I needed to make it run as safely and smoothly as possible over the next few months (i.e., Catch Can , 4 Bar MAP Sensor, BPV, Flex Fuel, injectors, etc.). Then the tune is an additional expense on top of all of that.

Your best bet. Hold off on install until you get the tune, and whatever additional supporting mods you need (e.g., JR Dual Rad/OC, Catch Can, DT Dbox). Then do the install for everything all at once.

It may also help if you define what "safe" means to you. Does "safe" mean, I don't have to worry about it blowing up every time I turn it on or step on it, or is "safe" referring to long-term engine life and performance.

There's a reason the overwhelming response you're receiving is to get a tune. There's a reason we feel this way. There's a reason your car needs a tune.

Just giving the car enough throttle to leave a stop drops the vacuum level enough to start to close the bypass valve and create positive pressure.

If you are set on doing this I would recommend removing the vacuum actuator and tying the bypass valve open with cable ties. It is the only way you're going to stay out of boost. In that scenario you will probably be in the range that the ECU can compensate as long as you stay out of the throttle.

But like everyone else said, spend the $400 and get the tune...

Ok, I appreciate the overwhelming response. I’ll give delicious tuning a call tomorrow to get a little bit more information. This is my daily driver so I want to understand a little more and do som research but I’ll try them out. If anyone has an experience to share that has a similar setup with an edelbrock SC. I would appreciate the feedback.

You will be in good hands with them. They know our platform really well.

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The overwhelming response is negative but the only actual tuner (from Cosworth I might add) has said it will be fine. I'm with him by the way and I've also spent time tuning on this platform. The rest are correct that to make the most from the car you need a custom tune but the car will run fine and not be dangerous on a tune designed for the stock exhaust. If anything it should be more conservative.

That’s my feeling, whole reason why I posted. I feel like the engine should adjust but also think I could play it safe with a more custom tune.

If you still have the stock exhaust, you could always re-install that until you're ready to tune it. That gives you a little safer route as well. :iono:

I ran this exact set up for about a month before I put my car away for the winter. It does indeed run really rough, throttle is not smooth, and idle is all over the place. I will be getting a delicious tune as soon as I take it out in the spring.

Way more hassle than it's worth. The tune will be fine and safe. It just won't run optimally. With that in mind, if you're just driving and not beasting the hell out the car all the time it's a non-issue, under light cruise and similar you just aren't making enough torque to do damage. Realistically you have to create more pressure on the components than you do stock to run any risk of damage at all. Plus if you have the ability to log and check, then you can do that and know for sure it's safe and not have any worries at all.

It's amazing how many people think a tune changes massively on a setup like this for different exhaust setups..... The ECU has ways of maintaining fuelling and controlling knock, things would have to be pretty different for it to not be able handle the changes.

I believe the only effect it will have is timing won't be optimized and fuel trims will be adjusted up. I think the ECU supports up to 15% fuel trim adjustment either way if I remember right? Anyone remember? Barely more dangerous than throwing a header on the stock car without tuning, which is no big deal.

It is not.