79 Performance
#16
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Based on Hacker's post the exhaust makes 30 HP difference so the 4 speed upgrade with much lower first gear it would be quicker !
#17
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Originally Posted by Jim bailey - 928 International
Based on Hacker's post the exhaust makes 30 HP difference so the 4 speed upgrade with much lower first gear it would be quicker !
Yes the 3spd is a dog off the line, but once the revs are beyond 3200 rpm or so, I found little difference from later cars (staying in 2 of course)
#18
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Originally Posted by Jim bailey - 928 International
Based on Hacker's post the exhaust makes 30 HP difference so the 4 speed upgrade with much lower first gear it would be quicker !
#20
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My 79 should have the 2:75 & does have LSD.
#21
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Originally Posted by BrendanC
By no means a disrespect Neil. I put headers, cams, and a dual 2.5 on my wife's 81 when I did a 4spd conversion, and I think was basically as quick as the 4.7L 4spd autos. Basically.
Reaction time sometimes makes up for slow launch and foot on brake, gas until it hits 3k, foot off brake gives it a little extra jump...
Are you going to be around this sunday afternoon, would love to stop by...
Neil
#22
Originally Posted by neil30076
No problem, after driving it for 25 years I know how it runs and what to expect!
Reaction time sometimes makes up for slow launch and foot on brake, gas until it hits 3k, foot off brake gives it a little extra jump...
Are you going to be around this sunday afternoon, would love to stop by...
Neil
Reaction time sometimes makes up for slow launch and foot on brake, gas until it hits 3k, foot off brake gives it a little extra jump...
Are you going to be around this sunday afternoon, would love to stop by...
Neil
Yes, Sunday hopefully will see some gains from today, when the fun starts with trying to switch suspension pieces and exhausts among THREE 928s to get them where they need to be for thier next stages in life. I wouldn't at all mind some extra eyes and hands either Saturday OR sunday.
#23
Your distributer could be a little off too, if its sluggish off the line. I have never driven an auto 928, but on my 5 speed the distributer was retarded a little too much and a simple twist woke the car up off the line, made it rev faster.
#24
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Originally Posted by BrendanC
Yes, Sunday hopefully will see some gains from today, when the fun starts with trying to switch suspension pieces and exhausts among THREE 928s to get them where they need to be for thier next stages in life. I wouldn't at all mind some extra eyes and hands either Saturday OR sunday.
Neil
#25
Drifting
Remember this is 1979 performance and it was probably pretty decent in its day, just feels slow by todays standard. My 82 auto was very slow off the line, but top end was very nice and seemed very controlable at speed.
jason
jason
#26
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The Corvette of that time base 350 L48 was 180 HP the "performance" L82 max was 230 HP ....Horsepower was simply NOT IN FAVOR in that era !
#27
Race Car
That torque number isn't half-bad, IMHO. And its at a nice place on the curve. That oughta lend a little pep off the line, shouldn't it?
More on-topic, my 83 Euro 5 spd is a different animal, but shares the CIS. It is noticeably happier down low with a fatter (richer) AFR.
More on-topic, my 83 Euro 5 spd is a different animal, but shares the CIS. It is noticeably happier down low with a fatter (richer) AFR.
Originally Posted by Hacker-Pschorr
Start with headers, recent dyno with my 79 5-speed. Stock engine with MSDS headers:
1979 US - 928 5-speed. 100% stock except for MSDS headers and custom Y-into a single exhaust - no muffler:
228.1rwhp @ 5,023rpm
282.6rwtq @ 3,848rpm
1979 US - 928 5-speed. 100% stock except for MSDS headers and custom Y-into a single exhaust - no muffler:
228.1rwhp @ 5,023rpm
282.6rwtq @ 3,848rpm
#28
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Advancing the valve timing will give you more grunt off the line with the three speed automatic. (3 cam degrees works well for me.)
On a '79, it is easy to do, with Mercedes offset cam keys:
clic pic for thread
On a '79, it is easy to do, with Mercedes offset cam keys:
clic pic for thread
#29
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Frank, easiest way to get that car to leave the line faster would be a healthy dose of wheelspin to get the RPMs up. 40psi or so in the rears ought to do it...
#30
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Originally Posted by SMTCapeCod
That torque number isn't half-bad, IMHO. And its at a nice place on the curve. That oughta lend a little pep off the line, shouldn't it?
More on-topic, my 83 Euro 5 spd is a different animal, but shares the CIS. It is noticeably happier down low with a fatter (richer) AFR.
More on-topic, my 83 Euro 5 spd is a different animal, but shares the CIS. It is noticeably happier down low with a fatter (richer) AFR.