I have a Fiat Bravo 198 1.9Jtdm 16v with 150 hp original.
Because i'm not confident at tuning (everybody his job and specialty), I went to a renound tuning shop in my country.
I heared from a lot of people they do a really good job.
I went over there and tuned my car with the original turbo.
Instead of tuning to 180hp as there stage 1 announced, they tuned it to 193hp. So i was happy.
The car was really powerfull in low revs and pulled like crazy.
After a couple of months a friend of mine drove it and even though i asked him not to put it in 6th gear (difficult gearbox), he tried and but it back in 4th and overreved. I immediattely felt afterwards that the turbo took a hit.
After a while the turbo started to die, so I looked to replace it.
I found a shop that could provide me a hybrid turbo that could raise the power to 230hp with stock engine.
I baught the turbo, mounted it and went back to the shop.
I payed again for having it remapped with that turbo. Results where very nice. 223,3 hp on the rolling road, but a bit smokey between 1500 and 2500 rpm.
They asked to test and report back. The smoke could get better after 500km driving.
That was not the case. Also i noticed better acceleration (between 1500 and 2500 rpm) when dosing the thottle instead of flooring it.
I went back, explained it and got as answer that this is normal with a hybrid turbo.
After a lot of explaining on my behalf while letting them have a testdrive and really letting them feel it (when taking the gas back between 1500 & 2500 there was a point where you felt the car pull better then at full throttle), they where willing to modify the mapping again.
They did a little modification which gave a better result and gave me more power below 2500, but i still had a lot of smoke.
So because they are not very experienced with that kind of turbo and i'm still not confided that the tuning is optimal, I wanted to investigate the tuning myself. I tried to get the original file written back to my car, but they just wanted to modifiy the mapping again, and where reluctant to write the original file back.
Because I don't want to be there testsubject i looked elsewhere for a similar original file.
Now when comparing the original and the modified files, I think I start to understand why the car was so smokey and the acceleration up to 2500rpm whas not so good.
Let me first explain the acceleration:
when full throttling, you feel like the mixture is not good, there is to much of something, I suppose injection (black smoke). Once you hit 2500rpm, you suddenly get 2.9bar of boost which clears all the unburnt diesel and gives a big puff of smoke but an enormous acceleration.
When dosing the throttle you get a smooth ride and much better acceleration.
So when compairing the files I noticed that the desired boost whas set 2900mbar from 1500 rpm up to the red.
With logging software I modified the desired boost up to the actual boost from 1500 to 2500 that the turbo could give at those given rpm's.
That made the ride much much smoother but i noticed the acceleration whas less.
I raised the desired between those rpm's with 0.2 above the actual boost and that gave again better acceleration without that smouthered sensation.
I now have much more linear acceleration and not that kick in the back at 2500 rpm.
Because I'm no pro i didn't modify anything else, so I still have the black smoke issue.
I'm looking at injection and timing, but that's not easy material, I read a lot of posts, I understand a bit, but not enough to modify it myself, but enough to understand that that part of my tuning got messed up.
Could someone give it a look and help or assist me to rectify this?
If someone could help me get to the 230hp that I should be able to get with this turbo I would be very thankfull.
I'm willing to do it myself and learn to do it decently, but there are so many posts on the forum and the search engine is not optimal.
There are also to many contradictry responses on some posts that it's not very clear what is right.
If someone could point me to the good posts and threads where everything i explained decently that would be awesome.
- The original File I got Online: "Fiat_Bravo_1.9_150PS_55207104_0281013580_386317"
- The "Original file of my car" that i created with the original file i got online: "WinOLS (My Bravo back to Ori conversion) - 386317)"
- The 2 versions of the file the shop made: "Stage 2 V1 & V2"
- The version where I lowered the boost almost equal as the actual boost and where I added a Launch Control
- A mappack for this ecu
I hope I'm going to get some feedback on this and not only a lot of download of my files and no response.
Thank you in advance!
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