UrS4 2.2T Avant project

[prj]

Ok, so the fuel/IAT correction will be always in use... I remember last time on dyno the tuner was astonished that suddenly the engine started to go lean in the upper end. We was thinking about the fuel temps, tank and pumps was really hot. But it may be this setting that started to take over..? This is factory setting, I havn't touched it because I was thinking it's just for engine start(heat soak adjusment). And now I have had lambda correction up to the redline so it hasn't gone lean even at 100C IAT.

I think I will set the correction to zero and take few dyno runns with the lambda off and see how it behaves.

This correction is useless with E85.
Anyone with experience tuning E85 knows that

As I said before - the IAT sensor is in the wrong place, before the fuel hits the manifold, so you can throw the reading out of the window. For sure there should not be any corrections from that sensor.

I don't trust maha dynos. They always increase the brake on high powered cars and they produce huge torque with cap power figures. So I don't know how hard that pushes the engine as well.

Doesn't matter what dyno you use, you can set the ramp rate. The dyno does not do anything by itself.
Being ill-informed and then bashing the dyno is really not smart.
Maha dynos are one of the best in the business, end of.

Yea, the run feeled like it took forever, I was thinking that the engine will not survive and that was just what happend. You look at the boost gauge, 3 bar has been there for a while, how much longer will it hold... PUFF!!!

Nothing close to real life stress on the engine. Another negative thing with such a hard brake was that when the rpm's rised so slow some resonaces and vibrations did like multiply and feeled really hard, that caused a trigger erreor a couple of times, what havn't happend on street or track.

I have done a 35 second pull on a dyno on 2.2T (preparations for 1 mile race).
680hp, 700nm and no problems with the engine blowing up. 98 RON, WMI.
Did you time how long the pull was? Normal pulls are 15-20 seconds. If the engine can not tolerate this, it will not tolerate a prolonged WOT period on the street (given an adequate dyno with adequate cooling of course).

But fuel economy!!!!

Irrelevant on WOT...
But I never had problems with EGT on E85. No point to run it that rich. I don't think it is possible to melt anything on E85, except for pre-ignition.

But then there is also a risk of flushing the bores.

Not on WOT there ain't!

I am rooting for you - but the last few pages of this thread made me cringe...
I will just say - experience is the most important thing here. Both with E85 and with 2.2T in general.

[diesel des]

Yep sure. Pays your money take your choice.

Sent from my LG-H955 using Tapatalk

[Thuppu]

But then there is also a risk of flushing the bores.

[diesel des]

Alcohol seems to tolerate a much richer mixture without droping power.

Sent from my LG-H955 using Tapatalk

[Error404]

Is there any need to run that rich? Adding that much fuel to cool crazy IATs seems counter productive, combat the cause of the problem

[V6quattro]

Damn bad news.

As for lambda, i and some of my friends are running lambda ~0.72. The power you make is the same, but engine will run cooler. EGT will likely drop 50 or more degrees.

But fuel economy!!!!

[rst]

Damn bad news.

As for lambda, i and some of my friends are running lambda ~0.72. The power you make is the same, but engine will run cooler. EGT will likely drop 50 or more degrees.

[diesel des]

So you have a burnt or broken piston now? Have you done a compression test?

Sent from my LG-H955 using Tapatalk

[Thuppu]

I don't trust maha dynos. They always increase the brake on high powered cars and they produce huge torque with cap power figures. So I don't know how hard that pushes the engine as well.

Yea, the run feeled like it took forever, I was thinking that the engine will not survive and that was just what happend. You look at the boost gauge, 3 bar has been there for a while, how much longer will it hold... PUFF!!!

Nothing close to real life stress on the engine. Another negative thing with such a hard brake was that when the rpm's rised so slow some resonaces and vibrations did like multiply and feeled really hard, that caused a trigger erreor a couple of times, what havn't happend on street or track.

[Error404]

Thomas with the after start enrichment you can tune out the problems with lean hot start due to heat soak in the fuel rail.
You can add fuel to reduce chances of knock with high IAT but you would need to carefully find where your knock limit might be as IATs rise. Then you can add some additional fuel if necessary above your AFR target. I guess on E85 you have more safety margin

[A80Avant]

I don't trust maha dynos. They always increase the brake on high powered cars and they produce huge torque with cap power figures. So I don't know how hard that pushes the engine as well.

[Thuppu]

Full WOT has been lambda 0,77-0.80.

[Thuppu]

Haha, lol, 563hp/763Nm @5090rpm and the room was filled with white smoke. The actual run did go to maybe 6500-7000rpm, don't know why it wasn't calculated higher..? No mechanical sound from the engine, it just started to blow smoke from the breather. Maybe head gasket or a piston..? The coolant looked normal so it may be a piston.

The brake on the dyno was incredibly hard, and I'm not sure if they did know 100% how to use it..? It's a brand new MAHA MSR500.

[rst]

Thomas, what lambda are you running on WOT with E85?

[diesel des]

As iat increases the actual corrected mass flow of air through the engine drops so required less fuel. But you are correct the mixture is more likely to ping or detonate and a richer mix helps reduce that. Would take some experiments and Thomas's test method seems good to me.

Sent from my LG-H955 using Tapatalk