How much performance gain from headers ??

[jondee86]

Dimitri Wrote:..... maybe a shorter final gear, or a 7age?

A shorter final gear is a great thing for a race/rally car. Keeps the
engine revs up and effectively "closes up" the gears. Because top
speed has been reduced hitting the limiter in 5th is possible

But, for a road car, the AE86 is already short geared at 4.3:1. Going
to a shorter final gear makes it unsuitable for travelling any distance
at motorway speed. My nearest race track is >100 km from home

A 7AGE ? Hmmm... then why not a 1JZE... or a 1UZ ?? Interesting
as these projects may be, I prefer to stay close to the original concept.
For me the only true AE86 is a free revving 1600

On my first dyno run with nothing but an Apexi intake kit and a 50 dia
exhaust, I made 81 kw (108 hp). My target is 111 kW (150 hp) = 30 kW
to find. This is how I plan to get there...

1. Mild street cams, good for say 8 kW
2. 4-2-1 header, good for say 5 kW
3. Modified head with small increase in compression. Say 8 kW
4. Quad throttle conversion with trumpets. Say 5 kW
5. Programmeable ECU, GZE CAS and coils. Say 5 kW

That's 31 kW without counting any of the small mods like pulleys and
exhaust etc., that can give an extra kW or two. From the research I have
done, I don't think any of these gains are unrealistic. And if one mod
comes up short, another may give more than expected

Cheers... jondee86