N-Tune
#316
The 928 S2 cams are setup for the DOHC heads... not a bolt-on for the SOHC heads on the 944.
The S, S2 exhaust manifolds have a different bolt-pattern.
The 2.7L exhaust manifold I doubt is any different.
It I do headers, then it will probably be one done by Dave, (FRF).
A different throttlebody is something I'm considering (probably a BMW variant, as they are going to be fairly similar to ours).
The S, S2 exhaust manifolds have a different bolt-pattern.
The 2.7L exhaust manifold I doubt is any different.
It I do headers, then it will probably be one done by Dave, (FRF).
A different throttlebody is something I'm considering (probably a BMW variant, as they are going to be fairly similar to ours).
Very interesting that you didn't find more power higher up the power curve. I completed the gerotor designs to (hopefully) reduce oil pump over-driving and cavitation. From these experiments, however, the 8v seems to have more to give in low-end and part-throttle grunt.
Did you change the tune when you made the mods? Or just look to see if there was a change in hp/tq.
Are you thinking about a cam with more of everything - lift, duration, overlap? I reckon there's a few percent to be gained there while retaining stock components.
I'm busily auctioning off stuff for funds for an NA Tune and cam key...
#317
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Charlie, thanks for confirming that the headers are the same.
Interesting about the header... Is there any before / after dynos of just the header? I can have FRF make me a long-tube 4-1 header, but I don't want to invest a lot of money for something that doesn't have any real gains.
Yes, most of the power increase was <6000rpm, but this is where the car exists anyway. I bet that the majority of the reason it was reluctant to gain much on the top-end is due to the camshaft. The cam refrains I will try does increase everything: lift, duration, & overlap.
The NA-Tne has 3-dimensional timing tables that uses load. So any physical engine changes I did, the Tune automatically adjust for them. I did try to do some tweaking of the timing & AFR after the engine changes, but there wasn't any extra power to be found. I think that this speaks well to the adaptability of the NA-Tune.
I will send you a PM regarding the oil-pump gear.
Interesting about the header... Is there any before / after dynos of just the header? I can have FRF make me a long-tube 4-1 header, but I don't want to invest a lot of money for something that doesn't have any real gains.
Yes, most of the power increase was <6000rpm, but this is where the car exists anyway. I bet that the majority of the reason it was reluctant to gain much on the top-end is due to the camshaft. The cam refrains I will try does increase everything: lift, duration, & overlap.
The NA-Tne has 3-dimensional timing tables that uses load. So any physical engine changes I did, the Tune automatically adjust for them. I did try to do some tweaking of the timing & AFR after the engine changes, but there wasn't any extra power to be found. I think that this speaks well to the adaptability of the NA-Tune.
I will send you a PM regarding the oil-pump gear.
#318
Nordschleife Master
#319
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The 951S is the same - I'm pretty sure.
So, now the question is what about the S/S2/968 throttlebodies, or another one that is easier to get?
So, now the question is what about the S/S2/968 throttlebodies, or another one that is easier to get?
#320
Burning Brakes
I think the '86 928 throttlebody could be the best option
http://www.ebay.co.uk/itm/PORSCHE-92...item5aea1c75df
http://www.ebay.co.uk/itm/PORSCHE-92...item5aea1c75df
#322
I think the '86 928 throttlebody could be the best option
http://www.ebay.co.uk/itm/PORSCHE-92...item5aea1c75df
http://www.ebay.co.uk/itm/PORSCHE-92...item5aea1c75df
#323
Race Car
wow interesting. I must have been measuring an early one or something?? I dileberately measured them back when I was doing the SC car. Again..Interesting and I stand corrected.
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#325
Nordschleife Master
iirc the 928 tb's are in the 65-70mm range, would think they would be too large. Anyone have an 3.0 S2 to measure? Surley it must be bigger than the 2.5's.
Btw, just tried the na TPS on the 951 spindle and it fits perfectly, so it should fit the S2 also. Therefore there shouldn't be any issues with mounting the 2.5na (single-stage) TPS to a later tb.
Btw, just tried the na TPS on the 951 spindle and it fits perfectly, so it should fit the S2 also. Therefore there shouldn't be any issues with mounting the 2.5na (single-stage) TPS to a later tb.
#327
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What about something like this one:
http://www.ebay.com/itm/BMW-E23-735i...adfd41&vxp=mtr
62-63mm I think...
http://www.ebay.com/itm/BMW-E23-735i...adfd41&vxp=mtr
62-63mm I think...
#328
Three Wheelin'
if i get a chance i'll measure my 968's tb this afternoon after work.
#330
Three Wheelin'
someone might want to double check theirs, mines still fitted and measuring was difficult but I think it's 55mm also.