terbiumactivated

Not me, every time I see this thread at the top I picture a stand up comic with a mike in his hand " I'd like to do a quick impression of a Boxster goes a little something like this".

lee88

Quick update from me as well here. As John said, during the cold dark New England winter I sent my car back to BGB for a little TLC. I wanted to upgrade the brake master cylinder to a more robust unit (991 GT3) for better pedal feel and we went ahead and added the X73 suspension, Cargraphic full exhaust (manifolds, cats, sport mufflers), and IPD plenum. BGB also updated some things on the software side and I swapped out the OEM Pirellis which were underwhelming and pretty tired at this point anyway for Michelin Pilot Super Sports.

I did another DE the other week at Thompson Speedway which was great. So between that, DE I did at NHMS in the fall, plus a couple thousand miles of street driving at this point I can say I've been totally thrilled with the car. I don't have any pics on the track (Craig - nice ones there) but the Thunder Banana (as my yellow car is affectionately known) handled superbly. Even though my car is primarily a street car, in retrospect I'm glad to have done the X73 suspension and Cargraphic exhaust and would recommend both to anyone considering a build w/ BGB. In addition to some power gains the sound of the Cargraphic system is exquisite at pretty much any RPM or throttle opening.

Considering I bought a base Boxster that had been traded in with just a couple thousand miles as a donor car + the BGB conversion, all in I'm still in the high ~$80Ks range for this car which is incredible.

jcastle

videos?

which engine did you use 3.8 or 991 X51?

did you do the lightweight pdk flywheel?

SBH54

Hey Lee,
If all goes to plan mine will be arriving at BGB tomorrow. I had already installed a full Cargraphic sys. and the IDP with throttle. I had first gone with a Agency Power exhaust but changed over to Cargraphic the quality of headers and exhaust is truly a work of art ,I can't wait to hear the 3.8L.
I'm going with the brake up grade, oh yes! most important, yellow powder coated calipers. I have a black car with the same wheels as yours. I feel I had a firmer brake pedal with my old 987S than on my 981 did the swap to the GT3 master cylinder work for you?

terbiumactivated

I bought a new house, I was feeling pretty regal about the finished ceilings in the new attached garage. Then Lee made a post.......

lee88

I also had a 987S before ('05 987.1) and agree that pedal feel was firmer and better than the 981. The GT3 master cylinder has definitely been an upgrade and has made the pedal feel substantially firmer. It's still slightly softer than my 993TT pedal which is almost absurdly firm, but I'm certainly pleased with the setup now for either street or track use.

The cost is pretty modest too in the grand scheme of doing broader engine/brake/etc swap, master cylinder part is ~$400 plus a little labor.

SBH54

Thanks, I'm adding it to my list I'm glad I read your post.

mlpor

Just to be comparing apples to apples, keep in mind the 350 figure is referring to "wheel horsepower" not the factory's rated power at the crank. A bit of a guess, but 350 at the wheels is probably @ 70 to 80 bhp more than the peak figure a stock 3.4 engine provides to the wheels - I've seen @ 275 - 280 on my stock engine dyno figures for SAE adjusted peak wheel power.

What were you expecting a @400cc displacement gain should show?

BGB Motorsports

Mike is correct. Your typical 3.4L 987.2 or 981 will produce roughly 290(ish)rwhp. The swap of a 991 3.8L motor to a 2.7L car creates an additional 150rwhp and 80 lb/ft of torque to the wheels. The swap of an existing 3.4L motor 981 to a 3.8L 981 is probably half than that jump...or close to it.

The sad sad truth is that some 98 octane and a tuned file would net us another 20rwhp but like everyone else in the world...I wait...patiently...or not-so patiently.

1analguy

I was completely aware of that fact. That's why I said "With Lee's car currently showing 350 rwhp" when talking about his 400 hp 3.8 S motor.

mlpor

Great, so for an @11.765% displacement increase from 3.4 to 3.8 liter, what's unreasonable or disappointing about finding @350 bhp at the wheels? Or "guesstimating" 400 at a crank?

If anything, I would say BGB is over achieving & doing better than one might expect based solely on the displacement increase - i.e. for bar stool racing purposes only, 1.12% x a 3.4 liter's either 330 or 280 bhp is @368 Crank or 312WHP By that measure, if it means anything, I'd have to say BGB's doing exceptionally well with the 3.8

ZX9RCAM

Did you mean at the crank, or is it actually producing 290hp at the wheels?

BGB Motorsports

We are hopefully going to get underway here with SBH54's build in about 72 hours. I am going to photo/video journal the entire process and we are going to set the clock to see if we can execute this entire thing in a week's time.

The job is quoted at 30 days as sometimes it takes 6 weeks to get a motor. Motors are expensive and we like to have 30 days to order the motor, take the deposit, do the swap and then road test the car. "Black Magic" as she was named yesterday is from Boston and are trying to get her outta here so her owner and can enjoy 2 months snow free.

Oh yeah...I almost forgot my reason for logging into this thread.

Dyno numbers below of a virgin 2014 Boxster with 3.8L swap, Cargraphic manifolds, stock PSE exhaust and IPD plenum. Lee's yellow Boxster is identical in delivery but did not have PSE originally so we installed the Cargraphic Sport Rear Silencers.

John

BGB Motorsports

P.S. The 981/991 cars are still running a stock ECU file. If you want to know what the car's true potential is with a Power Kit engine, ECU flash, pulleys, race gas and manifolds without cats, check this out.

Postman

John what is the torque dip between 6k-6.5k on the recent dyno plots? Is this a "feature" of all of the porsche motors? I notice even the stock 2.7L does it.