Davin

Hi Guys, just curious I know that the GT4 has the same engine as the 911 C2S but making slightly less power. How do I bump up the HP to the 420 that the C2S make? What is missing for the detuned?

orclean1

Go to DeMan Motorsports website he takes 3.8 and converts them to 4.5 producing 429 hp to rear wheels

orclean1

Davin , sell yours and buy a 50th annivesary with 430 hp stock from factory , I have one and it is quick and its on PCA classified

Mr Michael B

Its pretty simple. A engine is just a glorified air-pump. Make it take in & then dispose of air more efficiently and you will produce more power.

A simple set of headers, cat upgrade or delete, muffler improvements / along with air intake (plenum & throttle body) and a canned tune to take advantage of the new found efficiency ~ and viola... Carrera power.

Fabspeed sells a complete kit for $8k or so or you can pick & chose your Dundon headers, IPD plenum & Cobb tune. Done & done.

ExMB

.....

SGOGT4

Call Jamie are Dundon.

Intake runners, plenum, Gt3 throttle body
race headers and gt3 exhaust conversion

all that and you’ll be doing better than a Carrera S

GoKart Mozart

I think we all want that extra 40 hp or so, and I agree it could use it, and yes, more air in and more air out. Unfortunately, it doesn't come as cheap on this car than it does on many others, which is why I am reluctant to go that route. Headers and a tune maybe, but IMO, going for a shorter final drive, although costly as well, might be the better choice. I always wonder why there aren't more guys doing the shorter final drive ratio from Autoquest. It's about $5k for parts, shipping gearbox and labor, and gives a 19% power increase (in theory) since it is geared 19% lower. So 458 hp.

KOTYKB

Go to Dundon and get their headers with a tune, it rips

switchface

I'd love to see a stock GT4 from a roll pull with this re-geared 458 hp GT4. Throw in a Dundon tuned car while we're at it.

Five12Free

Easy... NOS

Warwick Morris

Dear Davin, you appear to have missed the last 4 years of thousands (ten of thousands?) of posts and threads on this subject. Once you sit down, search this forum and read all the stuff over the years, used new model 718 GT4 cars will be available. That will will save you $000's.

Yellowbyrd

….

MarcD147

they are THE best in the cayman and GT4 business; Porsche learns from them. Tell john how many horses you want, write a check and go fast

MidEngineRules

You can get to 420 with software and high flowing filters alone. FVD Brombacher (Germany) sells software and BMC filter kit for $2k I think. They use the factory trained Bosch and Seimens software engineers who have written code for Porsches for years. Their software leaves in all the safety features so you're car is as stock reliable, and the map is unique to your car. Plus if you upgrade any parts like headers they'll upgrade the software for free. I'm just waiting for my warranty to expire so I can finally do this. I don't care about a higher peak power, just want to increase throttle response and smooth out the power for the joy of it. I've driven a Spyder with this upgrade only and it's quite a nice bump.

I don't like the idea of a shorter final drive as it makes the car far less livable. Traction really suffers in low gears as does fuel economy and top speed. Sometimes you just want a little more oomph without transforming the car to even more single purposed than it is already.

Diablo Dude

https://www.fvd.net/us-en/FVD9816185...lash-tool.html

412 crank HP with the FVD software.