21 Horsepower C6 Corvette Increase (Easiest HP I've Ever Found!)

When modifying a C5 or C6 Corvette for more Horsepower, it pays to start by making sure it is mechanically sound and then evaluating how it is running on the current tune - even if it is a STOCK Tune. That's exactly what I did with the C6 and it led me to an easy 21Horsepower Gain!

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**HP Tuners Software and 2 credits - enough to tune one C5 or C6 Corvette**

Two Octane Boosters that are well respected:

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🔥🔥 Essential TOOLS for your Garage! ***

**C5 and C6 Corvette Storage/Winter Covers**

Scan & Tuning Related-

🔥 C5 & C6 Full Synthetic Oil and Oil Filters!

[trellk]

These HP tuner videos are fantastic, nice easy bites and explained well. It's been some time since I've looked forward to videos as much as I have yours. Thanks for the work!

[andrenj]

Real good info, i always put best gas and synthetic fluids as well. Sadly too many people are cheap and neglect their cars:(

[todd]

Great video! and reinforces my belief I should never, ever attempt to tune my C5. I just threw in that Diablo Sport 93 octane tune, fabricated a cold air duct through the license plate plug and blew out the air filter with my leaf blower. I spent the rest of my budget on tires, wheels and a kick butt stereo with back up camera.

Connect a computer to a car? I am smart enough to know NOT to attempt that! Admire the guys who can. That stuff is witchcraft!


Keep 'em coming, Toys!

[redvette]

Fantastic information on not only tuning, but what can be achieved with better fuel. Thank you!

[MCMLXXVII-]

Thank you for taking your time to help other Vette owners, as well as providing so much beneficial information. Great content! Please keep it coming. All the best..

[WarriorsPhoto]

Your work is good and easy to follow.

I'm impressed with what happens to our toys as they age. All a part of understanding these great machines.

[randolphcirilo]

Wow! Thank you bud!! Really great video, very informative!! Thank you for all you do for this Vette community!

[jrbird]

I appreciate this video. I too have a C6, but it's the LS3, and a TA with an LS1 so we're in the same boat. I am learning to tune only to expand on where I am post tune from my tuner. I didn't have a wideband O2 sensor but I have one coming in.

[HotRob]

Excellent video!
I see you have a C5 banner behind the C5…Uh?, You need a C6 banner behind the C6. Come on now,
you gotta represent us C6er’s too.😅

[BDraggon]

Awesome video T4L!

I've been looking for a nice C5 or C6 for about a year now. Thankfully the prices are starting to get more realistic again. Still with that said I don't know how in the world you got such a great deal on your C6! Very jealous....
Thanks for doing all the research and testing on these amazing cars

[daleblock]

I went thru exactly the same thing except I was on the dyno. A simpler fix was NGK TR6 spark plugs believe it or not. I was removing timing & power was dropping, swapped the plugs & started rolling the timing back in....that simple. Posted in HPT & the Corvette Forum years ago the results. NGK TR6 plug is a well documented solution.

[markkumahonen]

I love your videos! I have ls2 with diablosport 93 tune here in Finland. I have also oem air intake with open shroud. The canned tune made a big difference in power. I live about 300ft above sea level and our summers are not that warm you have there in US. Keep on good work!👍

[Motorsportsgeek]

Great info as always! I'll be filling up with 94 from now on. I also start using those octane booster bottles in the future

[paulc-jgug]

Excellent video as you for taking the time to make them....easy to understand and comprehensive.. like you I have a c5 6 speed and a 86 Gt fiero with a 3800 sc with the 4 speed.

[lexxielex]

Great vid as always! I’ll be reaching out again probably next spring (maybe this fall) after I replace that PITA check valve.

[davidncw]

Good stuff as usual. You could use the compression as a reason for more cam. Later intake valve closing point will bleed a little dynamic compression. In my way of thinking this engine is begging for more cam.

[ctvette]

VERY interesting! Thanks for the video

[nikkoalpha]

Another excellent C6 LS3 video. Just like with his C5 videos, these C6 videos are the best too. Thanks again for all your dedication to the C5 and C6 generations.

[fullsendC]

Thanks for going threw hpt I'm sure it's gonna help a lot of guys out, now I gotta math a pid for hp thanks 😅

[Carguylogan]

The LS2 timing tables are very conservative. Peak timing is only ~22° Dont forget about the timing tables for IAT, once the IAT gets to 113° the ecm pulls 7° of timing even without seeing any knock, its an automatic feature. You can soften that table a bunch. Log the air mass also because when my LS2 was on the dyno, it was seeing 16:1 AFR at WOT, and would randomly drop to 12:1. The MAF was bad. It drove fine and didnt throw a MIL though. We put a new MAF in it and it was fine. My tuner put 26° of advance in my LS2 with headers, exhaust, FAST 102 and a small cam and it had no knock retard on 91 octane 🤷‍♂️ and thats at 1, 200 ft elevation and 100° ambient temp... So definitely use a wideband and make sure your AFR isnt lean due to a faulty MAF or other issue.
My GTI has a 93 octane tune and even running 91 + VP Octanium wasnt enough to stop the KR. I ended up running 2 gallons E85, 8 gallons 91 and 3 oz Octanium for a 95+ octane E25 and that finally let the car have all the timing. Even up here at 6, 000 ft elevation northeast of Flagstaff where i live now, 91 + Octanium still shows KR which is curious since the car has lost 6-7 mph in the 1/4 due to the air.