[Kunz]

Thanks for the positive reactions!

...The car is now not only stronger but also faster. Made a single run yesterday to messure that out with the GTech and it showed me these figures. Start was very gentle, no material murdering, normal shifting:
0- 100km/h (62mls/h): 5.2s
0- 140km/h: 8.5s
0- 160km/h (about 100mls): 10.3s

As NA it was best with ruder starts:
0- 100km/h: 5.7
0- 140km/h: 10.4

...and this is only at 0.3Bar of boost.

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[SpeedForceRacing]

<!--quoteo(post=70438:date=Apr 16 2009, 01:59 AM:name=Big Dave)-->QUOTE (Big Dave @ Apr 16 2009, 01:59 AM) <{POST_SNAPBACK}><!--quotec-->You wont be the first to get over 400bhp, as 9M in the UK have already done that on more than a few occasions.....<!--QuoteEnd--><!--QuoteEEnd-->


I know they were buying our kits for quite some time but I didnt realize they lowered compression and made 400WHP.



Tim

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[Kunz]

Tim

...dont be afraid, I would love to go over 400hp but feel it is better to maybe go step by step. The next thing I am waiting for is the pulley to get good 0.5Bar of boost.

The Vitesse unit is great like I have it now. I am able to tune ignition about +-12° which should be enough for 0.5 Bar. Up to the 0.3Bar I run now I am running stock ignition. Worth noticing: The tuning is not really rich. I have also the impression that the IC is of real great importance.

I am looking forward that pulley [img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img]
I will then run a bit richer on full boost and also - if needed - retard ignition some degrees.

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[Kunz]

For those who want to have an impression what my car runs like with 0.3 bar max I got here a little youtube file:

http://www.youtube.com/watch?v=JO3tVPOFkwc

Shifting points are at about 6700 - 6800rpm, finished 4th started 5th a bit, so the runs are up to about 180 - 200km/h. The exhaust is a homemade catback system plus stock header and cat.
I am waiting for the pulley for 0.5bar to arrive now; this will make the car a bit faster then...

Beside me sits my 23 month-old son who really enjoys the rides in the Porsche...

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[mattipuh]

<!--quoteo(post=70867:date=Apr 26 2009, 02:39 PM:name=Kunz)-->QUOTE (Kunz @ Apr 26 2009, 02:39 PM) <{POST_SNAPBACK}><!--quotec-->For those who want to have an impression what my car runs like with 0.3 bar max I got here a little youtube file:

http://www.youtube.com/watch?v=JO3tVPOFkwc

Shifting points are at about 6700 - 6800rpm, finished 4th started 5th a bit, so the runs are up to about 180 - 200km/h. The exhaust is a homemade catback system plus stock header and cat.
I am waiting for the pulley for 0.5bar to arrive now; this will make the car a bit faster then...

Beside me sits my 23 month-old son who really enjoys the rides in the Porsche...<!--QuoteEnd--><!--QuoteEEnd-->

Nice vid! [img]style_emoticons/<#EMO_DIR#>/smile.gif[/img]
Both your son and the car seems to like the new setup!

I'm definitely interested in this kind of engine modification, when engine is opened next time for bigger maintenance (maybe in Fall 2010..?).
we have some legal problems in turbo-/supercharging cars registered after 1988 in Finland, but there's some tricks to work them around. [img]style_emoticons/<#EMO_DIR#>/smile.gif[/img]

.m

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[rhudeboye]

Nice video, cute hearing the little one go "Iee yieee yieee". Might just be the cam angle but that nose lifts pretty strong on acceleration. It really appears to pull hard. It's hard to get a sense of the speed do to the cam angle but judging by the time between shifts, it seems pretty fast. Would love to see more. Great work.

Now about those brakes...

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[Kunz]

Pagid yellow... [img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img]

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[SpeedForceRacing]

When the new pulley shows up in a couple days, move the camera up a little, maybe leave the son at home and send me the footage! You know us Americans are going to get on your ass about having a kid in the car blasting down the autobahn. I guess alot of people dont realize that families drive on the autobahn going in excess of 120+ like it is nothing.

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[Kunz]

...maybe a word on efficency:
Just drove the car on the autobahn for some hundret km to find out how much it takes and how well I tuned it. Remember up to now I drive without the Lambda-sond to make the car tunable. With the sond activated the ecu regulates VERY striktly to AFR 14.7 under 4000rpm, no matter how much load you drive. So without it the ecu runs just the map and the corrections I programmed and I can see if I got it or not...
Anyway driving in normal trafic at about 120 - 150km/h mostly pretty calm but also some full acceleration from time to time the 968 would need some 10.5l / 100km which seems absolutly OK for me...

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[Kunz]

Yes, Tim, I realiced that point as well as some comment in this direction was made on youtube. Fortunatelly I live in Europe and you know in German (not Switzerland) there are still lots of autobahn-km without any restiction and you find families drive very fast in their full vans with shocks that are sometimes probably far away from OK. Driving in a Porsche straight line - also at full acceleration - is really not something very difficult to do... but some dont know or argue with some princips just because of the exaust note it seems to be brutal and aggressive which it is not.

As my son is the greatest thing in my life I would never do anything to bring him in danger!

Sure I will keep on posting here to share my experiances as long as anybody is interested and I dont have to argue or fight back on these subjects. I am also thinking about taking away the video on youtube due to too many missunderstandings...

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[Kunz]

OK!
I now got the new and smaller pulley. Thanks, Tim!
On the 22nd of Mai I will instal it and tune the car on it. I am sure I will again get out a significant amount of performance and torque.

After some 1500 driven km (about 1000mls) there is just to say that everything works great. Also at higher ambient temperatures I have stable performance and no termal problems at all. Even though the car really boost most from 5000rpm up it is also really torquy at low and mid revs. What I also like very much is the absence of the dip at 3400rpm like it used to to have as NA with some exhaust combos.

Keep on posting here the results.

Kunz

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[pinball1008]

Keep on posting Kunz, this is just so interesting reading how this project is developing.
The photos and videos bring it to life so keep them coming.
Thanks for taking the trouble

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[Kunz]

OK!
I just come back from installing the new and smaller pulley to the charger. The old one was some 71mm in diameter, the new one some 57mm, so this should have an effect. The first results suprise a bit and on the other hand do not really. The car is making more torque earlier and significantly more torque max. BUT just a little bit more top performance.
- torque max is some 40Nm higher
- performance max is only some 10hp higher

If I take a look at the logging data I sure can see the reason why: The pressure curve increases linear as the revs go up to about 5000 - 5500rpm where it starts to really flatten. I experianced no belt slip and can hear no leak. But I guess it is the effect Bob wrote about in his SC thread: the airfilter seems to be maxed out I guess. From a cerain point on up the filter starts to work as a restricter, at least the pressure and performance-curve make me come to that conclusion.

Anyway, the car is really running well, smooth, no dips, no knocking, no thermal problems. As soon as I can I will post some more infos, esp GTech data. Also I will start to play with a bigger filter to see if I am right and can get out even more performance from this great engine.

Kunz

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[Kunz]

Never the less:
0- 100km/h (62mls) is now at 4.9s
0- 180km/h at 12.4s

Shifting point at about 6300rpm

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[Kunz]

As said here the comparison of the GTech runs Stock vs SC with big pulley and SC with small pulley:

You can see the car is making much more power than stock anyway, with the small pulley again significantly more. You can also see that the two SC curves come together again at 6000rpm. As said above, there seems to be some restriction in the system from a certain amount of air on up, hopepfully the airfilter, maybe also the MAF, the IC...

Anyway, the car is making seriously power now!

Alsway remember please, the GTech numbers are not real dyno numbers. What matters is befor vs after, the relative numbers, the curve... Also the up and down of the curve; this are some bumbs an the road which the GTech messures as acceleration. In real life power delivery is really smooth...

Kunz

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[Kunz]

Unfortunatelly I must post this here:

No, no, I didnt blow the engine! [img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img]
But the posted GTech curve is not worth very much as I realiced the GTech is not sensing the revs correctly for what reason ever. As I accellerate it senses the revs correctly up to about 5500rpm and then - while continuing accellerating at WOT - the sensed revs start to lower again! So this is the reason for the curve lowering that much after 5500rpm and ginving the impression, the engine wouldnt work very efficiently above 6000rpm. I found that the curve really didnt show what my "seat-of-the-pants-meter" told me; full power up to the rev-limiter.

Next week I will first replace the airfilter with a bigger one to lower restriction in the inlet and maybe give some more boost above 5500 (about 0.5Bar right now). Depending on the results then I plan to maybe reinstal the RSBarn header and 100-cell cat just to take away termal stress and maybe free some torque at low revs. Maybe some of you remember 9Meister doing that when they went over 400hp.

Still I have to say the car is really pulling strong now, fat torque, smooth and linear powerband, <b>pretty</b> fast over 4000rpm and fun to drive...

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[flash]

i finally reinstalled the oem cat - gained torque, just as i expected

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[Kunz]

I am not sure if the stocker starts to restrict on this side of the engine at the gas flow to be managed now... Even though using a SC - let's say - upsets the intake and its resonance function quite a bit it is still amazing how the basic characteristic is still there somehow obviously it is much more rpm-dependant than flow / volume / mass-dependant. So starting from this and looking at the curves I posted in "Testpipe" there still could be an overall gain with header / 100-cell / straightthrough, especially at the power level the car is running now.
On the other hand the car is realy running well and pulling hard to the limiter also with the stocker... and something I personally do not like about the combination "header / 100-cell / straightthrough" is the sound the system produces; way to "high". Sure, maybe the exhaust I made on my own (2 1/2 straight through) would deepen a bit, but still basicly it comes from the header.

I will see what is needed...

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[flash]

that was also dramatically improved with the stock cat going back in - i tried quite a few different cats - the less restrictive the cat the more pronounced the kazoo sound - besides losing torque i was gaining bad sound - not sure what the torque change will be for you, but it seems you are having the same sound issues

wrapping the header also helped a lot

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[Kunz]

Thanks Flash...

Here I got some new video for you all to see if you are interested:

http://www.youtube.com/watch?v=5tt0qZEWY2s

It showes the speedometer when accelerating at WOT with the setup I have right now. As you see I do not like rude starts and shifting, there is to little traction anyway. It was a pretty hot day so the car might be a bit faster early in the morning, still I like it very much, seems a bit faster than stock to me... [img]style_emoticons/<#EMO_DIR#>/wink.gif[/img]

What are your impressions?

Kunz

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