Boost Taper .. Late Boost ..

[rtune]

The first picture is as I got the car, nismo R1 ECU, it is rated

at 1.1bar however I think it was spiking to 1.3 then coming back to 1.1.

Pretty much it shows the car making 120kw at 4400 rpm and 180kw at 5000rpm

I wanted an earlier spool and to be able to control boost.

So..

An HKS EVC6 was installed (today). and cam gears, new dyno runs. We setup

two boost profiles, basically 16psi high and and 14psi low, (conservative).

Ok now you can see the car hits

* 0.68bar (10psi) by 4400 rpm (at which point it makes 120kw)

* 1bar (14.5psi) by 5000 rpm (at which point it makes 180kw)

and full boost is obtained at 5200 rpm.

then (for both high and low) there is a _steady_ boost taper, losing 3psi

from the high setting and 2psi from the lower setting.

The other snap is from the HKS EVC6 manual which explains two likely problem

boost profiles. The first is a spike, and the second is a taper, but only at the end.

So what is the problem? I'm annoyed about two apparently contradictory

things: late spool and continuous taper.

Shouldn't it be hitting 1bar at the latest by 4000rpm? isn't that the whole point of n1/gtss type twins?

Will a powerfc tune change anything?

---------

specs: N1 engine, R1 turbos (same spec as r34 N1s). nismo AFMs,

intake, weldina exhaust.

The AFR is good: starts at ~13 then drifts down to just below 11s.

by the way, on an initial hks evc6 setting of 11psi boost showed flat. 11psi all the way.

[jay1]

bump sorry

[rtune]

17 replies for "Help Bad" and nobody has any ideas for me?

Am I crazy in complaining about the spool on that dyno graph..

[rtune]

This is the torque and power graph (crank hp) that the setup SHOULD show.

Unless I'm reading it wrong, torque is right up there at 4000 rpm, therefore the turbos

hit full boost by then.

I can see the same power shape from 5600 onwards on the croydon dyno plot, I'm just

totally missing that fat midrange?