EGR off effects

by **smuj** » Mon Sep 29, 2014 9:37 pm

Well that's saved me asking a very similar question! Cheers guys

by **wartysniper** » Wed Oct 01, 2014 8:16 pm

Thanks juice you are a star. Thanks very much!

by **juice** » Thu Oct 02, 2014 7:25 am

Another one thing that i've noticed and saw these days on a guy directly on dyno.
Blocked EGR, improved airflow.
He advanced injection to 3.7 BTDC on dyno has 180 hp and 240 NM.
He retarded to 3.7 ATDC(negative), power was 186 hp and 280 NM torque.
Impressive, depite to all opinions that advanced timing makes more power. Yes , for petrol cars its true, but for turbo diesel the timing is very important.
Less timing(especially where EGR was in part load) , means less vanes angle to build boost , well less EMP(exhaust manifold pressure).
Too much EMP affects the power, economy and quality of combustion.
On my car i preffer to kep SOI stock after blocking EGR, better pedal response.

Current settings that i have after blocking EGR: See photos with N75 and Boost..i lowered N75 with around 10-14 units(15%) and lowered boost to the same value as around 1500 rpm. Dont lower too much boost under 1750 because car will be sluggish

n75.JPG

by **scoppack** » Thu Oct 02, 2014 11:18 am

have you got a shot of the ori aswell for compare? please :)

edit: Scrap that, I can see the colours!

by **juice** » Thu Oct 02, 2014 11:54 am

Yea, safe pictures and see colours red and blue if you look more:)
In fact open vanes with 15% and lowered boost with 100 to 300 mbar.

by **scoppack** » Mon Oct 06, 2014 6:48 pm

How have you altered the lambda/smoke in the low areas? I think that's where mine is playing up maybe.
I posted in the other thread about if its best to lower IQ limit, or does it then think it should have more air?
I've altered the upper axis for more fuel, but it didn't seem to affect the lower as I thought it might.

by **juice** » Tue Oct 07, 2014 7:50 am

You mean smoke map? The best way is to increase smoke map values in lower air values. Hitting smoke map means lag and loss of economy. I increased with 4 units fuel, starting from 450 mg of air.