What do you start with when building an engine?
#21
Tour de Franzia
![](/mt2011/images_td/ranks/supporter1.gif)
iTrader: (6)
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,085
Total Cats: 375
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
you must have missed it i guess. probably sitting in the corner shaking wondering if 8.6:1 compression was going to make your car a dog.
anyway, at the same boost level, advancing the intake cam gained me at least 30 ft lbs (max 40ish) from 3k to 4k with positive gains from 2500-4500. similarly retarding the cam at the top end made a difference of 60 hp.
look at the graph again:
http://y8spec.com/dyno/taleoftwoturbos.jpg
green = retarded
red = advanced
both runs are at 9.5 psi. same dyno, same day. mixture was not ideal due to the drastic changes in VE.
basically the VVT allows me to take the tallest curve on each side. red on the left, green on the right.
here's a comparison of the idealized VVT curve from those two graphs and photoshop (though in practice it should be the same) against TurboTim's twins. I forget what boost he was at.
http://y8spec.com/dyno/twins_vs_2876.gif
anyway, at the same boost level, advancing the intake cam gained me at least 30 ft lbs (max 40ish) from 3k to 4k with positive gains from 2500-4500. similarly retarding the cam at the top end made a difference of 60 hp.
look at the graph again:
http://y8spec.com/dyno/taleoftwoturbos.jpg
green = retarded
red = advanced
both runs are at 9.5 psi. same dyno, same day. mixture was not ideal due to the drastic changes in VE.
basically the VVT allows me to take the tallest curve on each side. red on the left, green on the right.
here's a comparison of the idealized VVT curve from those two graphs and photoshop (though in practice it should be the same) against TurboTim's twins. I forget what boost he was at.
http://y8spec.com/dyno/twins_vs_2876.gif
Thread
Thread Starter
Forum
Replies
Last Post
elesjuan
Build Threads
7
11-03-2015 01:51 PM
Motorsport-Electronics
ECUs and Tuning
0
09-05-2015 08:02 AM