S4 Vs S5
#1
What would win in a race, a series 4 n/a or a series 5 n/a? Assume they have nearly identical mileage (compression). It just seems like the s4's are usually faster than the s5's, even though the s5's were faster when they were new.
#6
series 5 made more options standard; i.e. there were no manual steering series 5s. Some added bracing in the doors and dash area also I believe. The series 5 also had the added benefit of the VDI manifold and lighter higher compression rotors which account for its increased performance.
#7
Originally Posted by samps' date='Dec 2 2002, 01:20 PM
...The series 5 also had the added benefit of the VDI manifold and lighter higher compression rotors which account for its increased performance.
#8
you can swap over the manifolds but it is not just a plug and play. The rotors would require an entire rebuild. Some people even choose to use the series 4 manifolds whem doing a large port job on an NA. I have no first hand experience with any of these swaps. I have just read about it.
#10
Cool, if I ever get around to rebuilding this '87 engine I have, I'll look into that '89 stuff. My ultimate plan is to rebuild it (prolly years away, if my '86 dies), do everything that money will allow while I have that engine open (port, '89 parts), and put it in my '86. In my world, no ultimate plans have actually occurred yet, but as long as that '87 is wasting away in my yard the potential is there.