very lean AFR @ +/-3000-3500 rpm [SOLVED]

Nistune topics related specifically to the 6303 cpu

Moderator: Matt

RJBijsterbosch
Posts: 28
Joined: Sat May 20, 2017 1:35 am

Re: very lean AFR @ +/-3000-3500 rpm [SOLVED]

Postby RJBijsterbosch » Sun Sep 17, 2017 9:46 pm

Torque wrote:Interesting when you think about it, possibly a resonance causing a pressure wave and unstable rail pressure ...


Interesting indeed, i think that the injectors will certainly cause a resonance in the fuel rail.

The good thing about this, is that i learned a lot. :D

Torque
Posts: 618
Joined: Wed Jun 16, 2010 10:08 am

Re: very lean AFR @ +/-3000-3500 rpm [SOLVED]

Postby Torque » Mon Sep 18, 2017 4:38 am

Yes, never remove something you're not sure about :)

RJBijsterbosch
Posts: 28
Joined: Sat May 20, 2017 1:35 am

Re: very lean AFR @ +/-3000-3500 rpm [SOLVED]

Postby RJBijsterbosch » Mon Sep 18, 2017 6:12 am

Torque wrote:Yes, never remove something you're not sure about :)


The reason why i removed everything can been seen in the attached pictures.

I gave the enginebay/engine a fresh layer of paint. All done by myself. I am very proud of the end result. Never done this before.

But now i'm getting a little bit of topic.

20170709_114308.jpg
20170709_114308.jpg (140.6 KiB) Viewed 951 times


20170709_114322.jpg
20170709_114322.jpg (127.78 KiB) Viewed 951 times


And a picture of the car then.
Attachments
20170709_114425.jpg
20170709_114425.jpg (119.19 KiB) Viewed 951 times

Torque
Posts: 618
Joined: Wed Jun 16, 2010 10:08 am

Re: very lean AFR @ +/-3000-3500 rpm [SOLVED]

Postby Torque » Sat Nov 04, 2017 10:52 pm

Looks nice!
Did you notice any loss of low down torque with that intake plenum?

RJBijsterbosch
Posts: 28
Joined: Sat May 20, 2017 1:35 am

Re: very lean AFR @ +/-3000-3500 rpm [SOLVED]

Postby RJBijsterbosch » Sun Nov 05, 2017 8:55 pm

Attached some photo's to show you what happened.

SAM_3199 (1).jpg
SAM_3199 (1).jpg (99.46 KiB) Viewed 882 times

This is when the Nistune ECU was placed in 2012. Blue line is before Nistune, Red line is after Nistune. With stock turbo, larger intercooler, boostcontroller 0.86Bar, Walbro pump.

20170412_203842 (1).jpg
20170412_203842 (1).jpg (66.87 KiB) Viewed 882 times

This is when the intake was fitted with the larger injectors.

Because the stock turbo is very small, it spools up very quick in combination with the new intake, the torque is increased @ low RPM.

I see that the rpm scale is not the same @ the photo's. But you can compare certain points.

Torque
Posts: 618
Joined: Wed Jun 16, 2010 10:08 am

Re: very lean AFR @ +/-3000-3500 rpm [SOLVED]

Postby Torque » Thu Nov 09, 2017 3:58 am

Hmmm

It's difficult to tell from the graphs and in the first dyno the torque graph is all over the place.
It looks as if there was slippage on the rollers of the dynometer?
Are both graphs with the OEM Nissan turbo?

RJBijsterbosch
Posts: 28
Joined: Sat May 20, 2017 1:35 am

Re: very lean AFR @ +/-3000-3500 rpm [SOLVED]

Postby RJBijsterbosch » Fri Nov 10, 2017 6:32 am

Torque wrote:Hmmm

It's difficult to tell from the graphs and in the first dyno the torque graph is all over the place.
It looks as if there was slippage on the rollers of the dynometer? Why do you think there was slippage?
Are both graphs with the OEM Nissan turbo?Yes, both graphs are with the OEM Nissan turbo.

Torque
Posts: 618
Joined: Wed Jun 16, 2010 10:08 am

Re: very lean AFR @ +/-3000-3500 rpm [SOLVED]

Postby Torque » Fri Nov 10, 2017 9:02 pm

I think because the torque graph (1st picture) is very inconsistent it never goes into up and down valleys like this.
Torque curve is usually a consistent graph (as in the second plot)

What type of boost are you running ?

RJBijsterbosch
Posts: 28
Joined: Sat May 20, 2017 1:35 am

Re: very lean AFR @ +/-3000-3500 rpm [SOLVED]

Postby RJBijsterbosch » Sun Nov 12, 2017 7:01 pm

A very sharp comment. I was thinking what it was, but now i remember. It's a few years ago :D . After tuning on the dyno and driving back to home, i found out that the clutch was slipping a little bit. Replaced it for a competition clutch stage 4.

I'm running 0.86 Bar boost pressure. With a greddy boost controller.

Torque
Posts: 618
Joined: Wed Jun 16, 2010 10:08 am

Re: very lean AFR @ +/-3000-3500 rpm [SOLVED]

Postby Torque » Sun Nov 19, 2017 2:17 am

That's a very good result given it is the OEM turbo and the low boost.
The downside is that the turbo runs out of steam from about 5700rpm onwards.
(you possibly can feel it somewhat earlier)
I was at that stage once, and I think it's the best performance you can have for the money invested.

Also the small turbo is pretty responsive and it's a lot of torque early on.
:)


Return to “Type 2”

Who is online

Users browsing this forum: No registered users and 5 guests