robz

I'm in the exact same boat you are and couldn't agree more.

I'm doing:

Borla x
ported TB
ported stock mani
Halltech CAI
flex/tune

I'm hoping for about 65 hp and better acceleration.

Streetrod782

I'm pretty sure you'll need to add headers to get 65 hp. You won't get it from that list of mods.

robz

Maybe wishful thinking but I was guessing:

Borla ~6hp
TB ~8hp
Ported Intake ~13hp
Halltech ~12hp
E85/tune ~25hp

It never works out when you add that way but that's my story.

dovervold

Long tubes are the key to go if you want see meaningful gains. My build was LG Super Pro Stepped headers, ported intake and TB from Weapon X, AFE CAI, 170 degree t-stat... Installed and tuned by Doug Rippie. Car rips pretty good and sounds mean. Throw E85 on top and you should be happy!!!

The Teknician

Thanks for the info. I guess I have a lot of thinking to do.

Jack Be Quick Racing

The actual cumulative total is always less than the sum of the parts. In other words, it won't add up like that. "Ricer Math" is when you take the optimal, sometimes unrealistic, best add from each change and come up with a total number equal to or even GREATER then the sum of the parts. Unfortunately, it never works out that way.

Borla - mufflers? maybe 2 to 4 (saw dyno and arguments of 2 to 10. Don't believe the argument for 10, saw a dyno of I think 4 or 5??). X-pipe less than 1 (saw a dyno here showing .8 hp).

TB - seen that all over the place from 2 to much higher...

Ported intake - hard to tell. Seen dyno with Holley provide a stronger number.

Halltech - seen arguments for more. I have a AFe and got some HP over stock; I think 10.

Tune - always good.

I'd look at some headers (mid-length) for 20+ or long tube if youre good with always running a tune.

xBoostx

Times two on that however I did it without headers and the car run amazing just that was running out of breath at 5500 so had to adjust shifting points the tuner own words when asked? -amazing knowing what was done.

Vararam old air intake ported t/body ported stock intake and sense the intake manifold was out I matched ported the intake ports on the heads filled tank with E85 and had it tuned.

robz

Yeah in my example I tried to take more avarage numbers. They still may be optimistic but I dont think you need long tubes to get 50.
Im betting theres alot in the tune esp with e85 with some experimentation with DI.

bigsapper

That's what I have plus ported exhaust manifolds. Not sure what my overall HP improvement is but a WAG would be not more than 40hp total, the bulk of that being the E85/tune. I have been 121mph in the 1/4 minus the Halltech, compared to 116mph stock.

Bill Dearborn

One thing you need to be careful about is the end result of your modifications. You can add more peak HP but slow your car down by losing average power under the curve. Mods that add HP tend to do that by shifting the HP/Torque curve higher in the rpm range. If by doing that you reduce low end torque (1000 to 3000 rpm) that will impact you right where you drive the car all the time. How many times are you going to spinning the motor to 6500 rpm with the resulting speeds to get the feel you are looking for?

Another thing to consider is everybody has a built in self limiter in their brain and if they haven't learned how to drive their stock configuration car to the limit they may never drive a modded car past the limit they have already set for themselves. I see this all the time where I sit in cars with Novice Students who are afraid to drive at speed on the track.

I have seen them struggle to push the throttle past a certain point and once they get the feel for the track it takes a lot of coaching to get them to push the pedal down far enough and long enough. I have told people I will tell them when to apply throttle by saying Gas, Gas and when to apply brake by saying brake, brake. Some have complained they didn't remember me saying brake. All they heard was gas, gas, gas, gas, gas. I did tell them to brake but the problem was they were so ingrained into their sense of when to let off the throttle approaching a turn they would start lifting at 600 ft to a turn and I knew they could go to the 300 ft marker at a much higher speed before hitting the brake.

I firmly believe dumping power mods into a new car is a waste of money until the driver is able to use the stock car to its max which is extremely rare to be able to do on the street. No room, too much traffic both pedestrian and vehicular. You want to be like the student I had who had an MR2. As we were crawling up the Esses at the Glen I kept saying more throttle and he said to me that is all there is. It is on the floor, has been there for the last 1500 ft and I only have 134 HP. That is when it is time to add HP.

Bill

village idiot

Isn't installing a cam a real PITA with the dry sump?

DrDyno

If by "more power" you mean greater acceleration, perhaps the easiest way to get there would be to lower your stock rear end gearing. Your car is equipped with 3.42:1 rear end gears. If you went to 3.90:1 gears, you'd realize a 12.4% increase in perceived power (as though you've gained 57 horsepower) without any engine mods or tricky tune. Of course, you'd reduce your overall gas mileage some but so would most of the mods mentioned above.

Just an "out of the box" suggestion.

Edit: Just found the following thread you may find interesting...
https://www.corvetteforum.com/forums...-10-gears.html

pkincy

Although too late for the OP, I would encourage any new buyer of the GS wanting more power to simply pay a bit more and get the Z06. The GS is a Z06 with less power. Hence if you want a GS with more power = Z06. And the upcharge is slight and you get to keep your warranty.

robz

So with the mods listed above we made 434rwhp on a Mustang dyno which reads about 13% lower than the local dyno jets.
I didnt baseline and not sure what a bone stock GS dynos at but this car should put down ~485whp on a dynojet for anyone interested in approximate gains.
Assuming the car shoul run low 11's in good air at that level.

SharkGray Blur

following.. I am after the same thing for a more fun / streetable, reliable car. and i cant get over the sound of the long tube headers so I elected to go with;
ARH long tubes
MSD Intake Manifold
Air Raid Filter
Throttle body
HP Dyno Tune
New Plugs, and Wires.


Goes into the shop in 2 weeks, cant wait to feel the results!

BELVIN20

I guess I am a little slow, but you buy a GS like you want, then you spend the money to get X more horsepower. It looks like to me, that by the time you by the GS,spend the money in mods, you have spent Z06 money. So in the end, looks like the Z would have been a better purchase because you have spent the same money & have way more horsepower. My 2 cents of opinion.

robz

Some people prefer n/a cars.
Some people like to tinker with their cars and enjoy the process of increasing performance under their own power.
Some people do all the work themnselves which keeps cost low and increases satisfaction.
Some people like to add their own SC and design their own builds.
Some people cant afford the Z06 up front.
Some people cant handle the power of the Z06 and are better off without it.
Some people feel its impractical to have all that power on the street and see no place to run the car to its potential.
...all types of people.

kaup30

Just add stripes, each one worth 10hp.. 5 stripes & problem solved

ferraf

IMO all good advice posted so far. I waited just over 6k miles by chance to upgrade everything. What you can do now and really get some noticeable performance is the air intake. aFe Momentum 5r is very good dropping intake temps and more volume to get HP. Problem is all the bolt ons you put on really don't get the full bang out of them without a good tune. The tune everyone says impacts the warranty but I'm less concerned about that as it depends what breaks...

A good tune alone can get you 30-50hp at the crank and any tuner would tell you to upgrade the air intake for a few bucks. Headers are not crazy expensing and allow more power and a sound you'll love every time you're in the car. If you're not tracking the sound is a total new car you'll love and get a little power while you're at it.

Air intake, Headers, and a good tuner is the best upgrade for the buck and risk to any warranty issues. Once you get miles on it (> 5-10k) then go ahead and upgrade CAM, and do what many of us have done with a little confidence there are no gremlins on the car.

Total guess here the Air intake, headers, and tune will get you well over the 50-75HP you're looking for, and nothing to replace when you want even more out of it!

Have fun with it!

Fred

ferraf

Borla x are the headers