Real world 3.0 ?
10-01-2014, 09:42 AM
#31
Rennlist Member
The turbo S head was based more on a 2.7 head but with similar mods as the 951 head. It has round intake ports, ceramic liners in the exhaust ports and has special thin valve stems. Compared to a 2.7 head, it is restrictive and doesn't allow much to modify the exhaust side.
Porsche was limited to how much hp the engine could make, so they designed the head for maximum torque.
Porsche was limited to how much hp the engine could make, so they designed the head for maximum torque.
10-01-2014, 10:05 AM
#32
Drifting
Thread Starter
The turbo S head was based more on a 2.7 head but with similar mods as the 951 head. It has round intake ports, ceramic liners in the exhaust ports and has special thin valve stems. Compared to a 2.7 head, it is restrictive and doesn't allow much to modify the exhaust side.
Porsche was limited to how much hp the engine could make, so they designed the head for maximum torque.
Porsche was limited to how much hp the engine could make, so they designed the head for maximum torque.
10-01-2014, 10:17 AM
#33
Rainman
Rennlist Member
Rennlist Member
In my experience a fully standard 968TS does not have that much of an impressive power delivery. It makes a lot of torque but the engine runs out of breath pretty badly beyond 5k rpm.
Now use the exact same engine with the ~K27/11 from the 968TRS and a bit more boost will provide much better performance and a broader powerband. When my buddy lets me drive his I am able to spin the rears in 3rd gear, and that is with the wide original 18" Speedlines with decent tires.
The car makes near 400hp in a very usable manner and considering it uses the restrictive original air box that is not short of impressive IMO.
Now use the exact same engine with the ~K27/11 from the 968TRS and a bit more boost will provide much better performance and a broader powerband. When my buddy lets me drive his I am able to spin the rears in 3rd gear, and that is with the wide original 18" Speedlines with decent tires.
The car makes near 400hp in a very usable manner and considering it uses the restrictive original air box that is not short of impressive IMO.
Does his car have an AFM to the 951 airbox or a 968 MAF? Bumping up in size to a Rogue S/S2 sized MAF housing (same rectangular opening size as the 951 AFM) would be a nice upgrade to the AFM and would still appear stock with the airbox on top, but would free up the top end power even more.
10-01-2014, 10:35 AM
#34
It's running a Bosch MAP sensor steering the Bosch Motronic. The AFM is replaced with a 3" rubber elbow with adapters between the air box and the compressor inlet, but the air box is unmodified with its rectangular outlet.
Yes, it feels like a 400/400 engine. Pretty much all one would want from a 3.0 8V this side of the factory original feel/polish.
Yes, it feels like a 400/400 engine. Pretty much all one would want from a 3.0 8V this side of the factory original feel/polish.
10-01-2014, 10:39 AM
#35
The turbo S head core is a 951 head with a different coolant channel to suit the 104mm block. Only other differences as Raj said is valve stem sizes, down from 9 to 7mm, and smaller outlet ports.
10-01-2014, 11:25 AM
#36
Rennlist Member
Hopefully, I will be able to post some side by side comparisons of the 2 heads soon.
A 3.0 liter engine is a beast with tons of potential. With low boost levels, it makes 400/400 all day and pulls hard like an NA.
I decided to go with a stealth MAF setup which replaces the stock AFM. Looks like an AFM to the naked eye but allows the use of factory airbox and snorkel which is fed directly by drivers side naca duct. I will post some pics. Very stealth.
A 3.0 liter engine is a beast with tons of potential. With low boost levels, it makes 400/400 all day and pulls hard like an NA.
I decided to go with a stealth MAF setup which replaces the stock AFM. Looks like an AFM to the naked eye but allows the use of factory airbox and snorkel which is fed directly by drivers side naca duct. I will post some pics. Very stealth.
10-01-2014, 11:42 AM
#38
Rainman
Rennlist Member
Rennlist Member
Hopefully, I will be able to post some side by side comparisons of the 2 heads soon.
A 3.0 liter engine is a beast with tons of potential. With low boost levels, it makes 400/400 all day and pulls hard like an NA.
I decided to go with a stealth MAF setup which replaces the stock AFM. Looks like an AFM to the naked eye but allows the use of factory airbox and snorkel which is fed directly by drivers side naca duct. I will post some pics. Very stealth.
A 3.0 liter engine is a beast with tons of potential. With low boost levels, it makes 400/400 all day and pulls hard like an NA.
I decided to go with a stealth MAF setup which replaces the stock AFM. Looks like an AFM to the naked eye but allows the use of factory airbox and snorkel which is fed directly by drivers side naca duct. I will post some pics. Very stealth.
Still looks on track for Friday delivery
10-01-2014, 11:43 AM
#39
Race Car
There is a 968 turbo s here local that dyno at the same place I did. You're spot on with the 400 400 figure. I took a pic of the dyno he did prior to my dyno on my 2.85 a couple years ago. For an older setup, it was quite impressive. I'll try to find the pic.
10-01-2014, 01:02 PM
#40
Drifting
Thread Starter
Sounds like the design of the port/valve was overkill for a NA 2.7 engine.....
10-01-2014, 02:26 PM
#42
Formula One Spin Doctor
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10-01-2014, 03:03 PM
#44
Drifting
Thread Starter