Pls Help! Lack of power mid rpms - possible misfire

[02maher]

Originally Posted by Ashikabi

K that's pretty clear. You are running 91+fuel right?

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Indeed, we only have 95 and 98 here both make no difference either

[Ashikabi]

Originally Posted by 02maher

Indeed, we only have 95 and 98 here both make no difference either

Jesus, 98? You're not in America are you?

You could try retuning it. Use the same map, or it was my understanding that there was a library of OFT maps. Perhaps there is a different one that will behave better.

Have you checked your air filter? Run seafoam/fuel injector cleaner?

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[02maher]

Originally Posted by Ashikabi

Jesus, 98? You're not in America are you?

You could try retuning it. Use the same map, or it was my understanding that there was a library of OFT maps. Perhaps there is a different one that will behave better.

Have you checked your air filter? Run seafoam/fuel injector cleaner?

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Air filter is 1.5 year old replaced it myself. I'm in Dubai they have good fuel here but no Ethanol type unfortunately.

[Ashikabi]

Originally Posted by 02maher

Air filter is 1.5 year old replaced it myself. I'm in Dubai they have good fuel here but no Ethanol type unfortunately.

I'm curious how your octane rating compares to American. Here 98 octane would be low grade race fuel. The highest you can get at a pump without ethanol is 94 I believe. I'm gonna guess your 98 is probably similar to our 93/94. Regardless, that's fine, so long as it's not low end fuel for commuter cars. The OFT can read info from the computer while driving right? Can you watch your AFR and related values as your RPM climbs through the affected area?

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[NoHaveMSG]

You have an OFT, do a datalog, bet your IAM is low.

Start here.

https://www.ft86club.com/forums/show...01#post1842501

Upload to datazap.

https://datazap.me/

Post link.

Get Help.

Profit.

[Tcoat]

Originally Posted by Ashikabi

I'm curious how your octane rating compares to American. Here 98 octane would be low grade race fuel. The highest you can get at a pump without ethanol is 94 I believe. I'm gonna guess your 98 is probably similar to our 93/94. Regardless, that's fine, so long as it's not low end fuel for commuter cars. The OFT can read info from the computer while driving right? Can you watch your AFR and related values as your RPM climbs through the affected area?

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RON vs MON ratings. We use an average of the two numbers whereas they just use the RON.
Take about 5 octane off any European (used in Dubai), Aussie or Japanese numbers .


Still stuck on what the tune is. If the stock cars were faster then why not just go back to the stock mapping and see what happens?

I think there is more to this story someplace.

[DarkSunrise]

As mentioned above if you have an OFT device, then datalog and post. That will show what's going on with your engine.

[sygfrid]

How about your wheels & tires set up? What's are their sizes? What's their weight?

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[02maher]

Originally Posted by NoHaveMSG

You have an OFT, do a datalog, bet your IAM is low.

Start here.

https://www.ft86club.com/forums/show...01#post1842501

Upload to datazap.

https://datazap.me/

Post link.

Get Help.

Profit.

So I just took it for a quick ride and saved 2 datalogs;

https://datazap.me/u/02maher/log-164...og=0&data=1-13
https://datazap.me/u/02maher/log-164...og=1&data=1-13

[NoHaveMSG]

Originally Posted by 02maher

So I just took it for a quick ride and saved 2 datalogs;

https://datazap.me/u/02maher/log-164...og=0&data=1-13
https://datazap.me/u/02maher/log-164...og=1&data=1-13

Do this.

Get car to operating temperature. Cruise at a steady RPM for a few minutes, and then post it. It is easier to see issues at steady state but from what you posted your fuel trims look jacked up. It is harder to see when you are on/off throttle a lot. Looks like you have an exhaust leak though. Looks like you are on a V4 tune as the IAM starts at .7, it does climb to .73 which is a good sign.

[NoHaveMSG]

Originally Posted by 02maher

So I just took it for a quick ride and saved 2 datalogs;

Also, remove "boost" and add "injection mode" to the log. You do that on the OFT in a menu with what parameters you want logged.

[Yoshoobaroo]

IAM goes to 1 in the second log so fuel quality is probably fine. Fuel trims are definitely indicative of an exhaust leak near the O2 sensor

[02maher]

Originally Posted by NoHaveMSG

Also, remove "boost" and add "injection mode" to the log. You do that on the OFT in a menu with what parameters you want logged.

https://datazap.me/u/02maher/log-164...5?log=0&data=1
https://datazap.me/u/02maher/log-164...5?log=1&data=1
https://datazap.me/u/02maher/log-164...5?log=2&data=1

Last one illustrates the shaking that I'm experiencing after 2300rpm, still on certain occasion it's worse than that...

If there is an exhaust leak is it most probably before the headers?

[NoHaveMSG]

Originally Posted by 02maher

https://datazap.me/u/02maher/log-164...5?log=0&data=1
https://datazap.me/u/02maher/log-164...5?log=1&data=1
https://datazap.me/u/02maher/log-164...5?log=2&data=1

Last one illustrates the shaking that I'm experiencing after 2300rpm, still on certain occasion it's worse than that...

If there is an exhaust leak is it most probably before the headers?

Yeah, your LT fuel trims are maxed rich.

Simple stuff first. I would check where the header mounts to the cylinder heads, you may see black soot where it is leaking. I would also check from where the header mounts to the overpipe, and around the O2 sensors.

An indication it is leaking would look like this picture. See the soot?