What kind of real world gains are being realized with these easy mods.
any experience out there.
cheers

 

You'll gain as much with just running E30. If you want more after that the ported IM. You will probably not see more that 8 to 10 rwhp with a ported intake, maybe 14 to 15 with a ported TB. I can't say on the CAI on the C8, just haven't had experience with the intakes, but you should look into the Attack blue air filter compared to GM stock unit.

 

I gained a 26HP from a ported intake, ported throttle body and Corsa hight flow cats.

 

Excellent response and rwhp/tq results.

 

So no other exhaust changes except the Cats? Wow, those are good numbers. You should consider running E30 lie I am and others on the forum. No tuning involved since the C8 comes with wide bands from the factory. Were the Corsa Cats a direct bolt on?

 

I agree.....those are some excellent numbers on the dyno. It really makes you wonder which mod made the most horsepower or maybe the combo itself. I have never had my car on the dyno. However, just by taking a wild guess I would say between 10 to 15 rwhp gains. Test and tune at the dragstrip revealed 1.5 tenths better on my time slip with the ported intake manifold, 87mm ported throttle body, and the Halltech Cold Air Intake.

 

No I have the stock NPP exhaust.Can you school me on the E30?

 

Well, I happen to have a station that sells E15, E30 and E85 which is usually about E65 to E70 in our area. Their are actually a bunch of guys mixing theirs to E30 since they don't live in an area where it's mixed at the pump like I do. I've never had it on the dyno to get a base on 93 and then the E30 difference. I have a lot of experience with E65 to E70 since I ran it in my 2022 Camaro before I went to a Magnuson SC and THPSI port injection, Added a FF sensor and tune it made about 37 rwhp. I also ran it in my C7 and made about 35 rwhp. It was mentioned by one of the guys that has had it on the dyno before and after, his made about 20 rwhp on E30. It's just not worth it to me to unlock the ECU, pay for 8 credits, add a FF sensor with all the labor involved and tuning your gonna be over 4k from what I've been told. To me I'll take the 20 rwhp, port the intake/TB maybe cats like you did and not have to touch the ECU. I think you can feel the torque difference when you go WOT. For me its at least a buck a gallon cheaper then 91 and even more for 93 octane. You can't run it in cold climate in the winter like Missouri where I live, it's too lean when its really cold. So, I just run 91 or 93 all winter and swap over in the spring as I have already done. If you have to mix it the formula seems to be 14 gallons of 93 and 4 gallons of E85. I've not run that since I have the option of E30 at the pump. I do hope to get on the dyno this spring and do the before and after.

 

Is the air in Canada ever not cold? LOL

 

Not sure, never been there but I'm guessing the OP can tell us. Dam cold here in Missouri today.

 

I agree sir. I have used the 93/E85 mixture at the dragstrip with my simple bolt-ons, no headers/cats and established my goal with 10.90 passes. I could be wrong but I really believe that just doing the safe E85/93 mixture with bolt-ons does the trick. Just adding the complete E85 tune will be taking a hard risk for me money wise just to get an extra 15 rwhp over the E85/93 mixture. Now I can say, just going E85 without any bolt-ons is great also. The results are pretty close. Just my .02

 

Thanks. So 4 gallons E85 and the rest 93 is the trick on a stock tune is the consensus in warm weather?

 

If you don't have an E30 from the pump station, then that's the formula that I understand has been used. Now that said every station may have different formula's from E65 to E77, that's what I've found in the past when I ran both my other cars with a FF sensors. That label on the gas pumps lets you know that the mixture can vary during certain times of the year. The E30 and E15 don't vary where I buy my E, just the E85 formula. Missouri is on a winter blend right now and that usually is around E50 and they usually don't switch over to the warm weather blend until spring has sprung.

 

In the Peoples Republic of California where 91oct is the best you can get, I was having low rpm high load engine ping. I found mixing about 2.5 gal of e85 for every 10-12 gal of pump 91 to give me about e20 blend for 93oct gave me what I needed to eliminate the ping. I swear the car runs stronger also, likely since the ECM is not pulling timing out for the ping. So whenever I get down to about 1/4 tank, I add 2.5gal of e85 and top it off with pump 91, simple and fast. The engine absolutely loves it.

I'm also running a 91mm eff Soler T-Body with an aFe COI and Cat Back system, cant tell you which made the most difference, but adding a few octane points to the fuel was one of the best things I've done. From what I have researched, the ported intake is maybe good for about 3-5 HP, the COI depending on which maybe add another 5-10. Its not likely you will be able to "feel" any gains from those alone. I sure could fell a difference when I did the Cat Back system on my car, and again with the fuel improvement.

 

I was thinking the same. But it has been a debate for years regarding the Cat Back making some power on the C8. It has been proven on the dyno on numerous occasions with different brands. I even saw a slight difference at the dragstrip for what's worth. Right now. I am looking at the Corsa Extreme NPP to complete my bolt-on mods.

 

Wow, those cats are expensive.

 

Yes. I paid $2,100 for the cats and blankets. I don’t think you can get them for that now.

 

Nope, Paragon has them with the blankets for 2615.00.

 

If interested, I could give you a better deal for both.

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