Well shoot yesterday I made a new avatar and today I had to update it again because my car churned out more horsepower!

We put the car on the dyno and did some baseline runs. I should caveat that since the last time I dyno'd at 317 HP to the rear wheels my engine has been torn down and "spruced" up a bit so our baseline was now 322HP or about 5hp more than my previous high. Hey, not bad.

So while leaving the car on the dyno we took off the IPD plenum and stock throttle body and installed the Softronic plenum and larger throttle body. WE MADE NO OTHER CHANGES. What that mean is that I did NOT flash my car yet with the Softronic plenum-flash, I still have the regular Softronic Cayman flash in my car that has spent the last month adjusting for the IPD plenum and the rest of my mods. I KNEW that this was not the IDEAL or MAX hp combination, but what we wanted to do was to see what change if any was immediate by swapping out the plenum and larger throttle body.

As you can see in the dyno chart the change was small, as I would expect, from a car like mine that is already heavily modified. We got a 4-5hp gain (we hit 327 one run but had a spurious reading in the lower rpms so we threw it out) from just the mechanical parts swap. Some parts on the dyno were higher, some were lower, but we did not give the ECU any time to adjust to the new hardware we just ran 3 runs and immediately compared the results.

What I plan to do is drive the car around with the standard softronic software in it to let it max out then go back to the dyno in a few weeks and check the new baseline, then flash with the Softronic Plenum software flash and see what that does for the equation. I didn't want to introduce too many variables at one time.

I had forgotten how deafening my car is on the dyno, I shot some video but it doesn't do it justice, my ears are still ringing! I want to thank the fine folks at Imagine Auto for once again setting me up with the dyno time. One other minor note and I'll post another topic on it, the rubber line included with the Softronic plenum kit works fine for the factory AOS, but I have the Motorsports one where the fitting comes off at a different angle so we had to modify the hose. I have pics and I've alerted Softronic to this for anyone who might have the Motorsports unit.

All in all I'm pleased with both the results of my engine internals work and just the hardware change over because I'm certain the software flash will get me more in the future. Now if I extrapolate out crank HP it comes out to 385 which is more than those X51 motors...

Attached Thumbnails

 

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K-Man S
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Wow 385 hp @ crank! So "spruced up" means............?

Some weight removal some strengthened parts and some balancing/blueprinting type of work.

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K-Man S
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Here is a YouTube video of the car on the dyno with the Capristo closed then opening to a wail...

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K-Man S
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K-Man S -

Your claim of 385 FWHP seems a bit optimistic to me. You measured 326 HP at the wheels. For the FWHP to be 385 would imply a driveline loss of 18%. This is much higher than is usually reported. Most dynos show a stock car at 260-265 HP, implying a loss of 11-13%. When Ed claimed a large flywheel HP number using an 18% driveline loss he got spanked pretty hard.

IMHO, a better way to describe your car's gains would be to cite the increase in wheel HP that has been measured. Didn't you start out at something like 265 RWHP? So you've picked up over 60 RWHP, which is a 23% gain, and is fabulous.

Ummm no that is a 15% drive train loss from 385 * .85 = 327 which was the run we tossed out but the 326 run was 326.4 so I rounded up.

I concur that one should look at wheel to wheel and yes I've gained 60 hp at the wheels. Everyone seems to like big numbers though... maybe I should call my car a GT60 ? You know like a GT40 but only 20 better!

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K-Man S
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I like how the wing comes up during the run :P

Can you verify that by linking us to your first baseline test?

Assuming this is accurate, this represents a claimed 90 hp increase over factory specs, and you did it all with bolt on intake and exhaust mods, along with an ECU flash. That's pretty impressive. That's an increase of about 30%.

Or if it isn't all just bolt on mods, then please specify what internal modifications were made to the engine when it was apart. I'm sure people want to know how to build a 385 hp Cayman.

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Originally Posted by K-Man S
elmo,
I never said I was mistaken about anything, I said that my understanding of your explanation was different from what I first thought.

Cayman GT385

I love it!

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2007 Speed Yellow Cayman GT 2.7 (retired)
2008 Guards Red Cayman GT 3.4
"Carpe Cayman"