My porsche 944 S2 16 valve turbo project
#136
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Unbelievable curve! Great results! Curious about timing during boost ramp. The spool-up is the best I have ever seen. Are you measuring EGT?
Also, did you design the intake (short runners) around optimizing a particular torque?
Also, did you design the intake (short runners) around optimizing a particular torque?
#137
Drifting
Join Date: Aug 2009
Location: Bangkok, Thailand, Milpitas, CA & Weeki Wachee, FL
Posts: 2,239
Likes: 0
Received 2 Likes
on
1 Post
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Forgive me if you have stated before, but I am curious as to which fuel you are using. E85 is very uncommon in the EU and 26 psi is the highest I have seen anybody running. Is higher boost another added benefit of the 16V head? Also be curious as to your oil selection. Thanks!
#138
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Forgive me if you have stated before, but I am curious as to which fuel you are using. E85 is very uncommon in the EU and 26 psi is the highest I have seen anybody running. Is higher boost another added benefit of the 16V head? Also be curious as to your oil selection. Thanks!
#140
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Pretty sure Tim is running 98oct pump fuel from memory? Might be stated earlier in the thread.
#141
Addict
Rennlist Member
Rennlist Small
Business Sponsor
Rennlist Member
Rennlist Small
Business Sponsor
#142
Addict
Rennlist Member
Rennlist Small
Business Sponsor
Rennlist Member
Rennlist Small
Business Sponsor
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Hi Chris, On the dyno we run a gauge above the engine which is clear and easy to see while running the engine. This gauge was showing close to four bar at 110 degrees, the problem we have is the feed to the console as a restrictor in it and this then take time for it to rise on screen. You can see at 5000 rpm ish the oil pressure is 57psi, we were probably holding it at them revs for a bit longer which aloud the screen to catch up.
It also looks like somebody either opened that door or turned on a fan at 6krpm. Sudden barometric pressure drop and temp drop. Either that or there is something hooked up with the sensors that disturbs the sensor grounds.
#143
Rennlist Member
#144
Addict
Rennlist Member
Rennlist Small
Business Sponsor
Rennlist Member
Rennlist Small
Business Sponsor
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
The sad thing is that we don't really consider that cold!
Winter lows can go to -30c
About an hour north of me got 30" of snow in the last two days.
BTW - a couple of years ago I got to do a chassis dyno session at about -15c. Since this chassis dyno has a giant 3 phase fan to pull air thought the test cell you have to open the garage door to the out side or it will try and collapse the building. The test results showed the air temp dropping quickly once the pull started. By the time we got to the end of each pull it was very cold. Good for extra HP!
Winter lows can go to -30c
About an hour north of me got 30" of snow in the last two days.
BTW - a couple of years ago I got to do a chassis dyno session at about -15c. Since this chassis dyno has a giant 3 phase fan to pull air thought the test cell you have to open the garage door to the out side or it will try and collapse the building. The test results showed the air temp dropping quickly once the pull started. By the time we got to the end of each pull it was very cold. Good for extra HP!
#146
#147
Drifting
Join Date: Aug 2009
Location: Bangkok, Thailand, Milpitas, CA & Weeki Wachee, FL
Posts: 2,239
Likes: 0
Received 2 Likes
on
1 Post
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Tom runs 100 octane 100% of the time, but never remember him mention more than 22psi ever, he has all kinds of knock monitoring enabled and still has some events at 20, with what I am sure is one of the better tuned engines around. I will be very curious as to the longevity of this build. I have been collecting parts for some time now. Going to attempt one of these as well. Tim appears to be pushing the limits, but I am all ears, very interesting. One of the best charts I have ever seen.
#148
Nordschleife Master
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
If you lock rpms long enough at each 500 rpm steps at 100% throttle you can get a huge turbo to spool very low down in the rpm range.
This is not to take anything away from Tim's work, absolutely not. But apples needs to be compared with apples and oranges with oranges
![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
#150
Drifting
Join Date: Aug 2009
Location: Bangkok, Thailand, Milpitas, CA & Weeki Wachee, FL
Posts: 2,239
Likes: 0
Received 2 Likes
on
1 Post
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Yes, also aware of his being an 8V, thus my interest if the head being so much better allows this large increase in "safe" boost. As Duke mentioned like to see the numbers when installed into the car and on a chassis dyno. Good point on the turbo sizing.