[Murder6.2]

What’s up guys, I was hoping to get some advice from some of the fast bolt on guys here. I have a 2017 A8 1ss that im trying to get to run 6s in the 1/8 with just bolt ons. I do have a few mods that I cannot do due to where I live.
Car has to run 6.9s at least with the stock Air box and Stock headers.
The car has already been 7.24s @97.6 with the stock air box, stock Tb, unported LT2, and CA cat deletes, and pump E85 (E78). The Drag pack I use isn’t the most efficient either as I’m running a 18x8 forgestar F14 with a 235/50/18 tire (43lbs a side) and 17X9.5 Racestars with 305/45/17 Et street Rs. (51lbs a side).
I recently installed a Kirkey driver seat, and will be taking the passenger and rear seat out for race days and I have a Circle D converter spec’d by Brett from Pray performance sitting around that’ll probably be my next mod. I will also be doing aerospace front brakes in about a month. I have a green drop in filter coming later this week as well, does anyone know anything about modifying the stock air box? Is it really worth it?
The stuff I’m debating on is whether or not it’s worth it to Port the LT2 manifold and pair it with a ported 95mm Tb. (I have a Pray 95 Tb sitting around as well) and doing a Underdrive pulley.
Also if I can run 6.8/6.9s with all the above I’d like to keep the 18x8 fronts. I’m not against getting real skinnies but if I don’t need them then I won’t get them. I do drive the car on the street often and these drive amazing.
Do you guys think my 6.8-6.9 goal is possible? I know this is a unusual mod list, but Any input would be appreciated!

[Yosh6]

Don't claim to be one of the fast bolt-on guys, but not a slow one either. Sounds to me like you are on the right track (pun intended). Get whatever additional horsepower you can (personally, I would consult Brett @ Pray on that one and ask him to tune it; tranny tune also VERY important); especially, with your unusual requirements (stock exhaust and air box). Brett told me 4 years ago that the Gen 6 air box is one of the best flowing stock air boxes GM has built, especially for stock/near stock air flow. At some increased HP level it will drop off; but, doesn't sound like you will get to that point right now.l After that, weight reduction and traction for a lower 60'. You'll loose another 80 lbs. sans the passenger and rear seats. As I've stated in another post, the converter did more for my 60' than any other mod. Your goal looks very attainable to me. Good luck.

[laynlo15]

I've been 7.02@101 with my C7 and it has Long Tubes, ported Mamo Msd, Stock 95mm TB, stock air box and E85 (E65 usually). My car weighs 3372 with driver and I ran that 7.02 in not so good DA of 2500 and mid to upper 70s. Getting the weight down will help a lot on an NA car like yours. I'm also running the Race Star Drag pack 18x5 with MH front runners and 18x10.5 with 285-40-18 Nitto 555r2s. I don't think you'll benefit from the ported 95 until you figure out the IM. The MSD will make more power up top then down low. I lost a few hundredths going to the MSD but gained most of it back with more timing down low on the launch plus the 95mm helped also. I don't run any adapter either. Oblonged the holes to make it fit the different bolt pattern. You'll get there just need the right parts and weight reduction to make it easier to get there. Good luck

[Murder6.2]

Originally Posted by Yosh6

Don't claim to be one of the fast bolt-on guys, but not a slow one either. Sounds to me like you are on the right track (pun intended). Get whatever additional horsepower you can (personally, I would consult Brett @ Pray on that one and ask him to tune it; tranny tune also VERY important); especially, with your unusual requirements (stock exhaust and air box). Brett told me 4 years ago that the Gen 6 air box is one of the best flowing stock air boxes GM has built, especially for stock/near stock air flow. At some increased HP level it will drop off; but, doesn't sound like you will get to that point right now.l After that, weight reduction and traction for a lower 60'. You'll loose another 80 lbs. sans the passenger and rear seats. As I've stated in another post, the converter did more for my 60' than any other mod. Your goal looks very attainable to me. Good luck.

Your car is definitely fast, some blower cars struggle to run a 10.7 LOL
I’m currently tuned by Brett, I haven’t emailed him about this just yet because I want to commit to these mods first (I’ve changed my mind on what set up to do a few times now). I was running a Rotofab dry before and got some logs of the car on the stock air box and I lost 1KPA (Went from 97 to 96) but couldn’t tell a difference in the butt dyno, so I don’t think it did much. I asked Brett about that and he said to just get a Green filter, and after a 2 month wait I got it today.
I’m hitting the track next week with a few small changes from my 7.24 1/8 pass (Kirkey/Seats out, F14 rear wheels weigh 5lbs less per wheel compared to the Racestars, and the Green filter). I’m hoping to get into the 7.1s.
Hopefully the converter and brakes can get me around .3 off combined after that.
Thanks for the feedback man I appreciate it!

[Murder6.2]

Originally Posted by laynlo15

I've been 7.02@101 with my C7 and it has Long Tubes, ported Mamo Msd, Stock 95mm TB, stock air box and E85 (E65 usually). My car weighs 3372 with driver and I ran that 7.02 in not so good DA of 2500 and mid to upper 70s. Getting the weight down will help a lot on an NA car like yours. I'm also running the Race Star Drag pack 18x5 with MH front runners and 18x10.5 with 285-40-18 Nitto 555r2s. I don't think you'll benefit from the ported 95 until you figure out the IM. The MSD will make more power up top then down low. I lost a few hundredths going to the MSD but gained most of it back with more timing down low on the launch plus the 95mm helped also. I don't run any adapter either. Oblonged the holes to make it fit the different bolt pattern. You'll get there just need the right parts and weight reduction to make it easier to get there. Good luck

The DA at my local track for the next few months will be 1000 and under.
3372 with driver is nuts! If I had to take a guess on my 7.24 pass my race weight was very close to 3800lbs. I’m hoping the Kirkey/Seats out will drop close to 100lbs off the car. Part of me wants to get a set of skinnies too I’m sure with some 17x4.5s wrapped in M&H tires I can drop over 20lbs over my current front wheels, but that’ll have to wait. I tried getting the Pray ported 95mm Tb with elongated holes to work on the unported LT2 but it just wouldn’t fit. I’ll definitely have to port the LT2 IM to be able to pair it. I’ve also been debating getting a Katech tb adapter but not sure if that’ll even gain me any HP that way.
Thanks for the feedback I appreciate it!

[KingLT1]

Originally Posted by Murder6.2

The DA at my local track for the next few months will be 1000 and under.
3372 with driver is nuts! If I had to take a guess on my 7.24 pass my race weight was very close to 3800lbs. I’m hoping the Kirkey/Seats out will drop close to 100lbs off the car. Part of me wants to get a set of skinnies too I’m sure with some 17x4.5s wrapped in M&H tires I can drop over 20lbs over my current front wheels, but that’ll have to wait. I tried getting the Pray ported 95mm Tb with elongated holes to work on the unported LT2 but it just wouldn’t fit. I’ll definitely have to port the LT2 IM to be able to pair it. I’ve also been debating getting a Katech tb adapter but not sure if that’ll even gain me any HP that way.
Thanks for the feedback I appreciate it!

Base C7 Stingray's weigh around 3350. Z51 adds another 100lb, Z06 adds another 100lb. So they are a good platform for NA because all you need to do is pull passenger seat, drag pack, and a light weight battery and you have a car that is down to 3150-3200lbs w/out driver.

[laynlo15]

Originally Posted by KingLT1

Base C7 Stingray's weigh around 3350. Z51 adds another 100lb, Z06 adds another 100lb. So they are a good platform for NA because all you need to do is pull passenger seat, drag pack, and a light weight battery and you have a car that is down to 3150-3200lbs w/out driver.

Haven't pulled the passenger seat yet but have thought about it. I saved about 100 lbs on Exhaust and drag pack. Last time I weighed was at the NMCA with 1/4 tank of fuel. I've lost 17 lbs since then so I'd say mine is 3356 now with a not so fat driver. I weighed 215 then so about 198 now and gonna take off another 20, then if I do pull the seat which should be about 58 lbs and put me under 3300 lbs. Mine is not a Z51 so as light of vet as you can get from the factory I'd say.

[Murder6.2]

Update on the build.
So I ended up replacing the stock TB and stock LT2 with a Pray Performance ported 95mm TB and a Ported MSD.
Car is running lean and needs a retune. Sent Brett a log already.
And Waiting on GPI to ship my Aerospace brakes.
Track opens up late January hopefully the car will be ready by then to make some passes.

Also for anyone curious on the KPA difference between a Stock LT2 and stock TB vs a ported MSD and ported 95mm TB, it jumped from 97kpa to 98.5kpa.

[Duramacr1]

Very Nice. I’ll see you out there bro. I installed cat deletes , unported MSD, rotofab, and a soler 103mm TB on the way. Still need a tune though. I’m gonna pull the passenger seat as well. I want to see how fast it will go at Irwindale .

[Trochoidal]

Originally Posted by Murder6.2

Also for anyone curious on the KPA difference between a Stock LT2 and stock TB vs a ported MSD and ported 95mm TB, it jumped from 97kpa to 98.5kpa.

On the LT2 setup, did you use the stock 87mm LT1 TB?

[Murder6.2]

Originally Posted by Duramacr1

Very Nice. I’ll see you out there bro. I installed cat deletes , unported MSD, rotofab, and a soler 103mm TB on the way. Still need a tune though. I’m gonna pull the passenger seat as well. I want to see how fast it will go at Irwindale .

I saw you were running 11.4s at famoso just on some Ethanol, that’s moving those LT1s are fast. You should have no problem going low 11s, and low 7s now.
After I installed my MSD/95 I took it for a spin and did a pull it doesn’t pull as hard as the LT2, I’m hoping the retune will get it where it’s suppose to be.
I’ll see you there bro, you have a IG?

[Murder6.2]

Originally Posted by Trochoidal

On the LT2 setup, did you use the stock 87mm LT1 TB?

Yes sir.

[Murder6.2]

Still getting it dialed in but this is where we’re at.
Only have one successful pass so far.
Next time out we’ll get that 6.

[s346k]

youre getting there. those auto cars are fast.