The Collecting Cars Porsche thread… - Page 28 - Porsche General

14,830 posts

223 months

Sunday 21st November 2021

The X50, as did my 996 GT2, utilised the K24 turbos, they're not as quick to spool as the K16s in stock form, but with a decent map and ideally some higher flow cats, they can be made to spool almost as quickly as the K16s, but with better flow at higher boost pressure without the raised inlet temps (X50/GT2 used larger intercoolers)

Some like the wait for it, wait for it, bang !! rush of boost, I preferred to have the boost come in earlier, more gently, then keep building to higher than stock all the way to redline, it made the car feel like it had massive N/A engine, and was easier to drive in all weathers.
IIRC you can amalgamate the K16 with the K24 to produce a K16/24 hybrid which gives you the best of both worlds. Though I dare say there are now far more modern turbos that are cheaper, quicker spooling and provide more boost.

https://www.fvd.net/us-en/FVD123022ATK/996-k-16-24...

Here's what I said about the remap and exhaust/cat swap in this thread :

https://www.pistonheads.com/gassing/topic.asp?h=0&...

"With the exhaust fitted and the diverter valves and wastegates checked, discussions centered on whether there would be any improvement in lag as the Ruf exhaust featured 200 cell cats.

Matt drove the car with the standard map and the new exhaust and professed that it felt “very strong”. A view I concurred with as it felt as if it pulled harder and came on boost earlier than my old Midnight blue car (when it was totally standard engine/exhaust wise) however Matt felt the power delivery could be improved on.

With the car back in one piece I went to test it on Saturday of the Bank Holiday weekend. Whilst it was dry when I set off from home, it had been raining heavily at Silverstone.

Matt loaded a new map into the car and I set off along my designated “test route”. With the rain stopped but the roads drying, the car felt ”Biblically fast” © J Clarkson.

The boost now came in earlier and harder, but far more smoothly than the factory map, ergo it also seemed more progressive despite the additional horsepower, and thus actually easier to control.

I returned to Fearnsport along the same road. Once back there I requested some adjustments to the damping (of which more later)
I then headed out again. With the damping adjusted I found myself travelling even quicker, however on the return leg the rain started once again.

Though still circumspect I was gaining in confidence, perhaps too much so, as when I accelerated down the slip road onto a dual carriageway, I witnessed that all too familiar sight of the rev counter heading rapidly towards 6000rpm but with no increase in forward motion. There was however a drastic increase in the yaw angle of the car . . . . ."

We ended up loading a slightly different map that brought the boost in just as early, but more gently and progressively. It made for very quick car that was absolutely fantastic to drive.

Edited by Slippydiff on Sunday 21st November 15:41

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