Location: Montreal, QC. (currently expat to Shanghai)
Posts: 3,249
Quote:
Originally Posted by steved0x
What all else does Porsche do differently in the 911 such that it has so much more power, and why can't we do that same stuff in the Boxster?
Steve
You can! Get 6 (six) custom ultra-light pistons machined out of titanium (e.g. the flat piston style, F1 tech, same as in the GT3), and get a tuner to design/machine you a set of cams with tad rounder/longuer intake lobes. If you have the cash, you could also get your crank re-machined and ballanced for the flat 6. Custom mapping and all, big big roars
A small and modest $20,000~$30,000 mod (350~400bhp)!
Horses are not cheap these days mate. Hence the higher price on those upper Pcars models.
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'97 Boxster base model 2.5L, Guards Red/Tan leather, with a new but old Alpine am/fm radio.
The lack of power wasnt from a lack of funding, it was done intentionally to keep a gap between the 911 and the Boxster. Equal power ususally results in the 911 having its ass handed to it by a boxster
that is what i am running (except the 996 intake manifold - i just have the 997 plenum) and the full top speed catless exhaust. i found that the 996 tune really opened up the car. i can run with 987.1 caymans on the straights now. how was the fit for the 996 intake manifold - you had to tap the head and add additional bosses yes? i would expect the longer runners would add some torque.
Last edited by The Radium King; 12-17-2016 at 09:31 AM.
that is what i am running (except the 996 intake manifold - i just have the 997 plenum) and the full top speed catless exhaust. i found that the 996 tune really opened up the car. i can run with 987.1 caymans on the straights now. how was the fit for the 996 plenum - you had to tap the head and add additional bosses yes? i would expect the longer runners would add some torque.
i won't make any quantifiable claims given the following caveats:
- i have no dyno results.
- my changes are done in batches (ie, new tune was done with new exhaust, new intake was done with udp, etc.) so i can't comment on how i can attribute improvements to one specific change or another.
- new exhaust is lighter, so is the benefit in power or weight reduction?
- my changes get done in the winter, with track and maintenance work in the summer, so i cant really provide 'back to back' comparison.
- the butt dyno is an inaccurate thing, easily fooled by engine sound, change in throttle curve, etc.
regardless, first and second gear now feel much more powerful when just hooning around on the street. power gets down harder on turn out (had to relearn a few things ...) and i was hanging with an instructor in a 987.1 cayman running r7s (i was on nt01s) so am happy with the results. i was tracking my trims before/after the change (the 996 tune allows me to run a cayman maf holder with my cayman airbox and removes the last restriction in my intake with 997 plenum and 74 mm throttlebody) and everything trimmed out well within specs (idle trims were naturally a bit higher but low load was fine). butt dyno says that the 996 tune brought back some torque. aside: this may make sense, as the 996 appears to be set up for more torque than the 986 - intake runners are longer, and the rear engine layout is better disposed to getting the power down earlier.
otherwise, the full sino-exhaust without any cats is an earful but DOES mellow over time. fit and finish was satisfactory and a black ceramic finish does reduce temps (and looks mean). the cacaphony is added to by the fact that i removed all the insulation where the roof sits (and remove the two engine carpets when at the track). not so much louder but more mechanical clicks and clacks from the engine. made even more noticeable by rennline transmission mounts. shifting DRAMATICALLY improved with the mid-level rubbers (didn't expect it, but noticably better engagement on an otherwise stock shifter, cables, etc,) and only minor increase in noise/vibration. i have some function first inserts for the engine mount as well, so we will see if stiffer engine and transmission mounts are too much in combination. regardless, the whole setup is still very streetable, even with the coilovers on full stiff - i've found that i can run my stiff suspension on the street if i use 17" wheels (the taller sidewall adds some play to the whole setup).
final steps - thinking 996 intake runners. there should be enough headroom with the 987 engine cover, but don't really want to tap the heads, and would have to figure out how to deal with the fuel rails.
Last edited by The Radium King; 12-17-2016 at 09:29 AM.
Nice, summary TRK.....you know I had not thought about about trans. mounts at all. Thanks for the tip. I don't want to increase noise and vibration though...
Nice, summary TRK.....you know I had not thought about about trans. mounts at all. Thanks for the tip. I don't want to increase noise and vibration though...
Jaykay, another downside of using stiffer engine and transmission mounts is the possibility that the knock sensor may read the vibration as detonation, therefore will be retarding the timing...
The Rennline ones are pricey wow! They give you the ability to soften and adjust if needed. It looks like there are various inserts with differing hysteresis characteristics.
Not sure how one would adjust once they are in there without a lot of work
I've got the Wevo trans mounts combined with OEM engine mount. Very nice, the trans mounts add a little bit of vibration at idle, like a massager, but I didn't notice any additional NVH outside of that.
well, since we are amongst friends, here is 7 seconds of full catless che exhaust, semi-solid transmission mounts, all rear insulation deleted, and no rear carpets. followed by 7 seconds of a set of nitto nt01's exceeding their slip angle ...
yeah, now i know why people dub in bad techno music over their track videos - so you can't hear all the idiot things they do with their throttle. with -insert preferred diety here- as my witness, i figured i could steer out of that, so got on the throttle anyways. yeah, those walls. regardless, i got luckier than this guy ...
Both feet in mother %&*$#@ and keep them there. That's what I used to say until I had a spin where I went both feet in hard and the abs came on and let me roll backwards across the track just like that even though I was mashing the brake as hard as I could. However it looked like the corvette just released the brakes and rolled back... It is a peeve of mine...
Both feet in mother %&*$#@ and keep them there. That's what I used to say until I had a spin where I went both feet in hard and the abs came on and let me roll backwards across the track just like that even though I was mashing the brake as hard as I could. However it looked like the corvette just released the brakes and rolled back... It is a peeve of mine...
I have not experienced this....so ABS active roll backwards? Yikes! Do you drop the clutch nowadays? In my younger days I have had big ABS cut out switches on my car such that I could shut it down if it started to get me in trouble
I am thinking I have never had this as in all my spins I have managed to use brakes to keep a fairly straight and keep forward momentum once things have snapped around.....been a while though for me. This excludes my Jeep on 401 black ice event
Udo
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