Fadz

Do you think 25 Horses worth US$ 14,000

Carrera Power Kit 345 HP - Includes modified cylinder heads, camshafts, exhaust manifolds, control unit, additional central water radiator and aluminium intake manifold - US$ 14K

fadz - C4S/02 <img src="graemlins/burnout.gif" border="0" alt="[burnout]" />

Waz996

Fadzy,

It's not only the HP gain you should look for..
What are the effects on torque figures, for example? What are the results on the various speeds ranges (say from 100-150 or 200-250.. etc..).. There arent any chassis mods on the kit, but you have a C4S already, am guessing you wont need additional stiffners..

Oh, btw.. you are starting to thing about modding your car up! one year later, I win!

Wael
996 99 C2

Waz996

How about you:

- double your bugdet <img src="graemlins/r.gif" border="0" alt="[king]" />
- get the turbo <img src="graemlins/burnout.gif" border="0" alt="[burnout]" />
- I come to dubai next summer <img src="graemlins/jumper.gif" border="0" alt="[jumper]" />
- Drive excessively fast <img src="graemlins/nono.gif" border="0" alt="[nono]" />
- Have tons of fun <img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />
- ..and get back to reality <img src="graemlins/crying.gif" border="0" alt="[crying]" />

Thing about it and tell me.. <img src="graemlins/yltype.gif" border="0" alt="[typing]" />

Waz <img src="graemlins/icon107.gif" border="0" alt="[icon107]" />

SPR

What about that unichip deal? Has anyone else seen it? It claims that they used this unichip and a dyno and cranked out 345 hp from a stock carrera. What do you think about this?

<a href="http://home.pacbell.net/oruehr/996_42HPgain.html" target="_blank">http://home.pacbell.net/oruehr/996_42HPgain.html</a>

they calim 45hp. What do you guys think about this. Also note, it's for a stock carrera, but the dyno picture, if I am not mistaken shows a turbo on the dyno - what's up with that?

If this is legit I would knock my laptop over to get one! I doubt it though.

kenkamm

This sounds good but I would worry a bit about the oiled filter- one needs to be very careful about these, as oil in the induction system fouls up the sensors, I've read.

Also, I'd sure like to see a torque graph.

Cheers,
Ken

Ed Newman

My opinion on it is this.... if you plan to drive the car very hard either on the track or street where you will be high in the rpm range alot, it is well worth it. I belive the claims of 25 hp are on the conservative side, the car can drastically out accelerate a non X51 car. There are tuners claiming 15 or so hp, not 25. Do keep in mind that most of these gains are from mufflers and intakes, neither of which are on the X51. The means that, in theory, you could bolt on the mufflers and intake and gain potentially even more since the X51 motors flow more and if the intake and exhaust are restrictive to a 320 hp motor that should be even more so to a 345 hp motor. If you drive like that and have the money go for it. I believe my money was well spent.

Dave M

Interesting numbers there. I'm brand-new to the Porsche thing, so please someone correct any mistakes I've read at that site. The stock C4S they claim is rated at 300hp flywheel. The dyno #1 shows a peak at 6500rpm (is that redline?) of 209hp. For a whopping 30% loss through the drivetrain. Stunning to me, is that normal for these cars? Maybe for the combination of AWD (by the way, the photo is of a 2WD dyno) and an automatic tranny?

Step 2, he assumes that 30% loss is accurate (ie, that this motor is actually generating 300fwhp), so here are his rear wheel gains:
2000rpm - 3hp
2500 - 2hp
3000 - 4hp
3500 - 5hp
4000 - 6hp
4500 - 8hp
5000 - 11hp
5500 - 12hp
6000 - 20hp
6500 - 29hp
You can see, not a nice consistent gain across the rpm band, sort of "peaks" at 6500. Then the 30% drivetrain loss is added back in, for a presumed flywheel gain of 42hp.

Another thing some folks might keep an eye on is whether there's a higher octane gas required once the tuning is in. Since the performance is usually gained by advancing timing, you could end up needing higher octane than you can normally find at a pump in your area. I don't know how these motors are tuned from the factory, this may not be an issue at all.

edit: I just noticed, they don't mention a AWD Carrera, I must have dreamed that part. Ignore my comments about C4S or AWD...

Dave

SPR

I have also seen another one from a company that is pretty reputable in germany, called h&s chip tuning. It appears a gain of 30 hp, and maybe 20 on the torque. I have seen others as well around the 20-30hp range. I was just really set back by that 42hp gain. It seemed way over the top and I wanted to know if it was baloney or not. Any ideas?

<a href="http://www.hs-elektronik.com/datenblatt-e/porsche911carrera-996-300ps-350nm.html" target="_blank">http://www.hs-elektronik.com/datenblatt-e/porsche911carrera-996-300ps-350nm.html</a>

Ed Newman

A couple thoughts...

1. The C4S is 320 hp, so a claim of 29 hp gained may be only 9.
2. These cars are very finiky on fuel. The car can make substantially less on bad gas and I have heard claims of significantly more simply by running a tank of GT+ 104 unleaded.
3. Horsepower cna be measured in many different ways and is also effected by atmospheric conditions etc. The only fair way to do a comparison to is take a stock car, dyno it, make the change, dyno it again on the same dyno, then change back for a 2 way comparison. This would be all well and good except the DME in the Porsches can take a few hours or hundred miles to 'learn' the new setting and readjust. This unfortunately makes all of the dyno testing simply inaccurate. Maybe testing with 2 cars and back and forth calculating will result in a fair comparison, but I have yet to be able to get most of these tuners to even provided provable documentation of their claims.

SPR

uh actually it's my bad, I put it on the base model of 300hp. So that's 30 off that. An additional 30 would be applied to the 320 to bring it to 350 or so. I am looking at a carrerra not a c4s, even though the thread is about that so, you're a bit off, but that's my fault. If you back track off the link and click the c4s then you will see, if it is listed.

SPR

here it is for the c4s

<a href="http://www.hs-elektronik.com/datenblatt-e/porsche911carrera-4-996-320ps-370nm.html" target="_blank">http://www.hs-elektronik.com/datenblatt-e/porsche911carrera-4-996-320ps-370nm.html</a>

Ed Newman

Interesting... looks like someone had fun with a graphing program, too bad the graph is not accurate. I doubt they have even dyno'd this product. If so they would have a real dyno sheet from a chassis dyno most likely. Had it been done on a engine dyno, the graph should match the ones from Porsche. I'll give you a hint, they are not a perfectly straight line like the one on this site. I'd be very weary of anything from a tuner without real hard facts to back it up. Especially if they are making rediculous claims.

Rob in WA

As you can see you lose some torque from 3500-4500 RPMs, but then you gain some from 5500 RPMs on up.

For normal street driving I'd rather have the low end torque, but if your racing go for the X-51.

I'm curious as to how much weight it adds.

Waz996

Fadi,

Get a Turbo or bust.

Wael
996 c2 99

Rob in WA

The X-50 on the Turbo does give you a lot more bang.