Quote:
Originally Posted by jts1981
The exhaust and the tuning is different between the 2 models. Look up realm.com. They are clearly different. Another member even switched
his 35i exhaust to an is.
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For the front part of the exhaust system, all the part numbers for the pipes and cats are the same:
http://www.realoem.com/bmw/partgrp.d...03&hg=18&fg=10
http://www.realoem.com/bmw/partgrp.d...67&hg=18&fg=10
Only the mufflers seem to have different part numbers
http://www.realoem.com/bmw/showparts...44&hg=18&fg=20
http://www.realoem.com/bmw/showparts...44&hg=18&fg=20
This was for 2009. If there are really visual changes, perhaps it is related to model year and not is vs i. I mean they may have updated both the i and is at the same time with later model years. I did not go through all of them on real oem...
Quote:
Originally Posted by jts1981
When you speak of over boost are you thinking the 35is only has 300hp and the extra hp is only during over boost?  |
Nope. What I tried to say is that perhaps the over-boost function only boosts torque at lower RPMs so that peak hp is not increased (from 335hp). But I have no idea...
Quote:
Originally Posted by jts1981
I mean look at the dynos from ESS. Its pretty clear. The 35is makes more power and sooner then the 35i. I don't know why you keep fighting the fact. Both dynos are posted on their website.
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I do not want to fight. I just did not like the V8 vs Civic statement.
The facts you stated are correct. I am just adding the fact that the dynos are related to different cars and are probably measured with years in between! Essentially the HW and tune is the same, so any differences, if measured, must come from somewhere "outside". Ie somewhere not relevant.
But because you asked me to, I looked at the graphs again, and none of them are actually even our cars. The first one is probably an early 6MT 3-series (with ESS, only 6MT cars will rev past 7k rpm). The other one is the much newer 1M if the heading is to be believed. And we already know the early N54 and late N54 are not exactly the same. So how to factor all these things and years out? And btw, something seems to be wrong with the last graph as the rev limiter kicked in at 6700rpm. With the 1M, this should not happen until 300rpm later.
I would only use the dynos as indicators of what the ESS tunes do relative to the stock performance on the same car on the same day/dyno/fuel etc...