Poppacapp

Working with Brett @ Pray Performance on my 2017 Grand Sport. He is well known on the Camaro6 forum with his 2016 Camaro SS running record times.

We have been doing some remote tuning and logging. I do not have the wideband on the car yet, so we have not made fueling changes. Mostly spark, shift points and torque management modifications. There is for sure more left in the tune. Currently on 93 octane as I have not installed the flex fuel kit yet either.

Results are OUTSTANDING so far.

Mods on the car currently are:

* - Pray Performance ported OEM Intake Manifold

* - Pray Performance ported OEM Throttle Body

* - C7Z06 Repo wheels 19x12 with Mickey Thompson ET Street SS 325/30-19 Drag radials(Repo wheel and radial 7lbs heavier than each OEM wheel/tire combo)

* - Tune work in progress on 93 octane.. will finalize once WB and Flex fuel sensor is installed


Car ran 12.20@115 bone stock on oem street tires at Rockingham Dragway, NC at approx. 3500ft DA


Went to Fayetteville Motorsport Park last night. In the past, Fayetteville has shown to be about 1-2 tenths and a mph slower than Rockingham. Was able to run 11.71 @ 117 last night. DA was approx. 1900ft.

4 tenths and 4mph gain in the 1/8th, and 5 tenths 2mph gain in the 1/4.

For what little has been done to the car, I feel these are awesome results and would like to thank Brett (Pray) for his knowledge and help. We have a gameplan for the car, and we will see it putting down some serious ETs soon.

Attached slips

FYREANT

So the repro wheels and tires combo was a total of 28 lbs heavier for all four?

Poppacapp

I only have the repos on the rear for now. I have matching 19x10 fronts coming but on backorder. So a total of 14lbs more rotating mass on the rear wheels than oem

Poppacapp

I'll be going with a lighter weight solution soon. I just needed something quick to do some testing and logging with

PRAY

Thanks Mike. Car is running well. We will continue to work out the kinks. Mike has been doing his own tuning with my guidance. I have complete confidence we will get the car lined out. I wish we would have had base line times at F'ville. Comparing F'ville and Rock times are pretty tough. We got to get the fuel lined out up top to get you into the 25 mph back half range. 95 mph in the 1/8 in that DA is legit.

Either way, I predict a 10.99 on pump gas and stock converter with this car and bolt ons. A little deeper into the 10's on E. 10.50's with a converter and well into the 9's H/C when we get there. Stay tuned. The weather is going to start getting better soon.

robz

Subscribed.

robz

Hey Pop. I think this tire I talk about in this thread may be an option for you even as an auto despite what some may think.

https://www.corvetteforum.com/forums...ck-clutch.html

Poppacapp

Thanks for the info. I looked at the thread. 245 seems a little on the narrow side for me, Once power starts coming into play with mods, I am unsure a 245 will hold. My GS is A8. I am currently considering ordering a set of Weld S77b in 18x12/18x5. Looking at possibly going with 305/35-18 to stay as close to 26" as I can.

robz

I don't believe they are too narrow but whatever you decide you are in good hands with Brett.There are many ways to get the job done. I've seen similar tires work on high hp cars and don't doubt they could see low 1.4xs and better with the right setup. And the mph you could achieve would be another story. Id do a 18x9 or 9.5 on the rear. Just thinking out loud brutha.

robz

We have always preferred narrow tires to get the job done on the drag strip with all late model corvettes in stick and auto. The problem I see with the c7 is that in 18" there's not many choices as the gap between the 245 and the 305 is too big. I feel the 305 is just too big based on experience with other platforms at that level.
Back in the day we were some of the first to play around with a narrow 255 50 16 tire and it quickly became a game changer for all the cars we recommended it to even a turbo that was making some steam. I've personally launched at 6500 rpms on that narrow tire. Now the 18" is going to have less meat and I can't guarantee it would be the best option but it checks most all of my boxes.
I believe that tire also is their newer compound so that's another step in the right direction. Think about your goals and your future setup and how much hp you predict you will make. We can easily calculate what 60' you would need to achieve your goal and see what tires are capable of that. I bet I can show you a timeslip of what you will need incrementally to achieve your goal. Why push more weight if you don't have to? You'll definitely want to run on a good track with proper prep. So just food for thought. I'm not certain but I'm fairly confident. I wish I could test it out for you.
And if a manual can be successful the auto can with greater ease.

Poppacapp

I appreciate all of the info for sure! I am hearing Weld wheels does not have an 18" solution for our cars(mine being Z06 specs/spacing etc) I find that hard to believe... and hope it isn't true. I will call Weld in the morning to confirm. I could be ok with a 10.5" wheel if 12 is overkill

PRAY

Thanks for the vote of confidence Rob.

I am convinced that the 1/4 mile clocks were off. They tend to always be a problem in that lane at that track. I don't see how we gained 4mph in the 1/8 and it didn't translate in the 1/4. We will get it all figured out.

PRAY

I can't remember what wheel/tire combo we ran on Cajuns car. I know the tire was not all that wide though. I do believe his car had regular rear brakes on it though. I want to say is was 265 Hoosier?

Poppacapp

I had no idea it would be this difficult to find a decent track setup without paying Gold prices per ounce for the wheels.

Fore58

i agree. .....should be at least 120 range

PRAY

In addition to the .4 we dropped in the 1/8 we dropped .5 in the 1/4. There is no way the car would have continued to drop ET if it "slowed down".

robz

It will all come together.

I'm going to be helping some fellas out at the track with these cars and will share any track experience.

At some point I will get someone to test those tires even if I have to buy a set myself.

cv67

x2
Guys are going 10s and better on way less rubber you probably need less than you think. You need some sidewall and just enough width to hook thats it. Youll go faster

Keep at it..

bigsapper

Yeah, it's a bitch alright.

Nice setup.

robz

Obviously not an apples to apples comparison but this tire is just about the same width as the 245 tire I'm thinking might be best for most c7's in both auto and stick trapping 130ish or less that don't want to change anything but rims.

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