Twin Cities Performance

10/17/2026

Fun project, Justin did a great job with the build and brought it to us to add our TCP port fuel injection, cleanup the methanol and dial it in. WE ended with an 8.00" lower and 4.00" upper pulley combo. This winter the car is going to get a triple pump low side setup and will come in and easily make 1300whp on more boost.

MOD LIST:
- 390CID Late Model Engines
- CIDHeads - Competition Induction Designs Heads
- Gwatney Performance Innovation Custom cam
- ProCharger Superchargers F1A-94 (8" lower / 4" upper)
- TCP Custom Port Injection w/ FuelTech injector driver
- Twin-nozzle methanol injection
- Walbro 350lph low side fuel system
- Brisk RR10S spark plugs gapped to .024"

RPM and boost currently limited by the fuel system — more to come

Walk-around and dyno pull. Tuned at Twin Cities Performance, St. Paul, MN.

2017 Chevrolet Camaro SS on the dyno at Twin Cities Performance — 1...

10/17/2026

Great product, amazing guy. What Wisher Performance is doing for our industry is incredible. If you're not familiar with AuxJection and you have a Gen 5 LT motor, you need to be. It's a lower-cost fuel system that outperforms any of the current port offerings — this is our go-to fuel system at Twin Cities Performance for anything 1k whp and under.

10/13/2026

Figured I would give it 24 hours before posting.
Best numbers on the street:

3.99 60-130
3.24 100-150
9.56 @ 166mph 1/4 mile time

Run 1 was from 50 to a little over 160mph and at the end of a 35 minute drive into work. The quarter mile run was done 2 minutes after Run 1 50-160mph run. Pump E85, no cooldown, no ice, no weight reduction. Just straight up streetcar with an 18” drag pack.

No it did not run the 1/4 mile on the street faster than your Plaid…and I know your 10k BMW can do this with bolt ons and a tune. But we are still just getting started, once we get this thing to 60’ and front half a little quicker it is going to be very, very fast.

and the winners are.....
60-130 Actual 3.99, Guess 3.99 right on the money John Wilmer
100-150 Actual 3.24, Guess 3.51 Mike Johnson
1/4 Mile Actual 9.56, Guess 9.44 James Bird ...come down and pickup a hat or shirt!

Here is a quick rundown and shoutout to those that have helped:
TCP built short block
Gwatney Performance Innovation Ported heads/Camshaft
Huron Speed Products Turbo kit with Garrett - Advancing Motion G35 1050s
Brian Tooley Racing Trinity intake
TCP custom fuel system, Fuel Injector Connection 1000cc injectors, FuelTech Injector driver
TCP custom ECM/TCM
Tons of help from Wisher Performance getting secondary fuel pump and boost control/power management strategies out of the stock ECU (more to come on that)
Z clutch assembly
Stock trans, axles, high side fuel pump/injector, low side fuel pump

10/12/2026

***Guess the STREET 60-130, 100-150 and STREET 1/4 mile times. Whoever is closest gets a free hat or tee. Will post this afternoon, some ppl know already, DO NOT POST IF YOU KNOW!!***

Its about time we update some C8 content. We have been spending a lot of time developing a quality fueling and boost control strategy for our C8 and it is finally coming together.

After Powercruise #2 we took the car apart and did a rod/piston package along with a set of stock casting GPI ported heads and a GPI camshaft. We assembled the heads with stock LT4 Ti intake and L8T Inconel exhaust valves. We also did a shorter runner BTR Trinity setup with the anticipation to run it out to 8000rpm if needed. The goal was to make build a really efficient NA motor would make 530-550whp NA so spool would not be an issue.

While it was apart we upgraded to a Z-clutch with the anticipation of making a little north of 1200whp. Well we finally found some time to get it on the dyno last week and were really happy with the results. We ran it on pump E85 (actually measured out around 65% ethanol) and using the stock ECU for boost control it pumped out the following numbers.

780whp on 6 psi
880whp on 9psi
1107whp on 13psi
1230whp on 16.8psi

We decided to stop there since we were short on time and it was getting near the clutch limit. I was wrong and was able to keep it locked at around 1300whp on the street earlier today. On the street with a 325/35/18 ET street R the car ran a pretty impressive 9.9 second 1/4 mile at an even more impressive 158mph.

With that we decided to take it to rock falls this weekend and run it. We struggled with getting it to launch clean all day, the air was pretty trashy (around 3k feet) and I was just not in the the zone. All that being said the car went a 9.63 @ 153mph. Fair but a lot of meat on the bone.

Not what we were hoping for I unloaded the car when I got home, went over the data. Made some fairly significant torque reporting and transmission/clutch setup tuning changes and it completely changed the car.

This morning we made 2 60-150 run and 1 launch and full 1/4 mile pass. When guessing Dragy times I started at 10psi and ramped to 23psi. Street launch was on 4psi with a similar boost curve to 22-23psi.

https://youtu.be/ephVEKWRt7E

09/29/2026

Good old Brian Tooley Racing PDS stage 2 V2. Great idle sound, drives like stock and makes killer power!!

09/04/2026

First time running the new BTR canted valance cathedral port heads and very happy with the results.

These heads are beautiful pieces and overall fit, finish/quality of the heads. The decks are massive, machining is very, very clean.

This car originally came to us a a bolt on LS1 that made around 350whp. The current setup is an LS2 aluminum block based 39x cid 12:1 compression ratio with BTR 400+cid camshaft(236/25x, 636/636 114lsa)

We ran the car a few days ago with the PRC stage 2.5 243s. It made identical power to when we built it last fall, 513whp and 468ft/lbs.

We then swapped just the heads and reused (without any port matching) the Fast intake. It should be noted that port alignment is not great and we are pulling the intake now to address that. But we wanted to get an accurate bolt on change. The old setup had a .045” thick gasket and the new setup we dropped it to a .040. The old heads were a 62cc chamber and the new heads are 61cc.

Results:
Red line - baseline with PRC head
Green line - ran hot BTR CV head
Blue line - Engine cooled BTR CV head
Yellow - ran hot BTR CV head w/bellmout

So straight back to back results (red vs green) were an honest 30whp!! I would have been happy with anything over 20 so I was ecstatic to see 30 wheel.

We will likely be port matching the intake and building a proper 4.5” intake with hopes to make around 560whp na with under 400cid.

**Dyno Video and idle video in the comments**

Brian Tooley Racing
Brian Tooley

08/12/2026

We have been getting s**t about not having more cam chop videos so here ya’ll go. We will start posting more videos in the future as well. We will start with one we finished up yesterday.

***more vids and pics in comments***

17 SS A8
Long tube headers
Flow FX rear section
Gwatney Performance Innovation SS3 camshaft

07/30/2026

As soon as we heard HP Tuners had unlocked the T46 for the TR9080 transmission we pulled and next day shipped our TCM in for unlock service. We have been working with different transmission calibrations and have found a really nice combination that is allowing us to get quick/clean shifts at 750-800whp. There are still a ton of tables yet to be defined but the improvements in shifting over where we were with the stock TCM and pressure controller are night and day.

This car is still 100% stock other than the turbo kit and PCV routing. We are on a blend of 110/premium fuel and right at the limit of the stock fuel system so this is as hard as we can currently push. Right now we are at 9-10psi and these Garrett G35s are just getting started. In the next month we will have port injection/more low side fueling on it we we can lean on it more we continue to develop.

**Of course we are at the limit of the stock motor and are willing to accept the consequences. When you own your own test cars it really helps with getting aggressive. After we finish up this year the engine will be coming out for something much more robust. Until then we are going to keep squeezing until we find the limit.**

Additional testing and 60-130 runs will be coming shortly. The car will be at Powercruise USA this weekend which will be a great endurance/torture test. As long as everything stays together and keeps working like it should we would be happy to give rides.

801whp C8, Huron Speed Twin Turbo kit w/Garrett G35-900sCompletely...

07/14/2026

Keeping the C8 train going. This car already came in with a few bolt ons already, but got almost everything else to make it a max effort SBE set up. This was the most recent heads/cam car we just wrapped up. Except this one got a little extra flair to it. Fitted with a twin bottle, direct 8 port injected, NO2 system by Nitrous Outlet that’s controlled without any standalone ECU’s! This was something our customer requested, as NO2 isn’t our traditional route, but it sounded fun and figured if we’re going to do it we are going to do it right! It’s only on a 100 shot for now, but there are bigger plans to come with this one in the future.
Here’s the details:
- GPI - Gwatney Performance SS3 camshaft
- GPI - Gwatney Performance ported/milled cylinder heads
- Brian Tooley Racing valve springs/pushrods/dfm plugs
- Cometic Gasket MLS head gaskets
- Performance Design carbon pTR intake manifold
- Chevrolet Performance LT5 throttle body
- Nitrous Outlet NO2 system
- DSX Tuning flex fuel kit
- Mightymouse Solutions
- Eventuri carbon cold air intake
- Kooks Headers and Exhaust
- Twin Cities Performance custom dyno tune via HP Tuners
Car made 544whp & 486wtq on E85 motor only, and 645whp & 585wtq on NO2.

07/08/2026

With the good news of TCM tuning now being available for the C8 platform, here’s a heads/cam car we did over this last winter. It was tailored to be a daily driver with calm manners but to have a presence when pulling up. See idle video and dyno graph at the end. This car turned out awesome! Overall is a great build for anyone looking to enhance there C8 Corvette, maintain stock drivability, but pack a mean punch behind the throttle!
Fitted with:
- GPI - Gwatney Performance SS2 camshaft
- GPI - Gwatney Performance ported/milled LT2 cylinder heads
- Brian Tooley Racing valve springs, pushrods, and dfm plug kit
- Kooks Headers and Exhaust long tube headers w/green cats
- Valvetronic Designs Exhaust Systems titanium valved cat back exhaust
- Halltech Systems, LLC cold air intake system
- DSX Tuning flex fuel kit
- Mightymouse Solutions catch can
- Twin Cities Performance custom dyno tuning thanks to HP Tuners
Final numbers were 536whp & 482wtq on E85 (red line on graph is pump gas)