Ah thank you sir! Sucks we can't just edit team engines!
That´s not true.
We can edit team engines easily.
If you want to edit the Renault engine on the Red Bull for example to be a bit stronger........
1.) Look at the default Renault Engine of the Red Bull (redbull.vtf.xml) :
<Engine>
<RevsPowerSpline numVertices="34">
<SplineElement x="0" y="0" op="=" />
<SplineElement x="70" y="2005.52197265625" op="=" />
<SplineElement x="140" y="9136.263671875" op="=" />
<SplineElement x="212.591751" y="31849.431640625" op="=" />
<SplineElement x="295.8333" y="69573.0703125" op="=" />
<SplineElement x="364.1106" y="101428.8984375" op="=" />
<SplineElement x="427.7802" y="127237.3046875" op="=" />
<SplineElement x="494.240875" y="155837.234375" op="=" />
<SplineElement x="567.999939" y="190885.609375" op="=" />
<SplineElement x="652.194641" y="232477.3125" op="=" />
<SplineElement x="734.4498" y="281330.59375" op="=" />
<SplineElement x="796.1757" y="330087.71875" op="=" />
<SplineElement x="854.4085" y="382910.34375" op="=" />
<SplineElement x="906.5044" y="433287.59375" op="=" />
<SplineElement x="950.746338" y="486216.125" op="=" />
<SplineElement x="1007.40405" y="546514.1875" op="=" />
<SplineElement x="1061.57288" y="590612.875" op="=" />
<SplineElement x="1126.83044" y="615525.5" op="=" />
<SplineElement x="1203.38672" y="626388" op="=" />
<SplineElement x="1259.88342" y="618539.5625" op="=" />
<SplineElement x="1309.10168" y="601291.875" op="=" />
<SplineElement x="1356.38477" y="583902.6875" op="=" />
<SplineElement x="1409.6422119140625" y="563697.9375" op="=" />
<SplineElement x="1466.705" y="538263.5625" op="=" />
<SplineElement x="1518.67737" y="517202.375" op="=" />
<SplineElement x="1580.99048" y="494926.5" op="=" />
2.) To make it a bit stronger you need a look to the first engine upgrade package the Renault Engine would receive in Career mode :
<Upgrade name="radUpgradeTier1Engine_lvl_1">
<Engine>
<RevsPowerSpline numVertices="34">
<SplineElement x="0" y="0" op="+" />
<SplineElement x="0" y="19.10019" op="+" />
<SplineElement x="0" y="87.01211" op="+" />
<SplineElement x="0" y="303.3285" op="+" />
<SplineElement x="0" y="662.6" op="+" />
<SplineElement x="0" y="965.9906" op="+" />
<SplineElement x="0" y="1211.783" op="+" />
<SplineElement x="0" y="1484.166" op="+" />
<SplineElement x="0" y="1817.959" op="+" />
<SplineElement x="0" y="2214.072" op="+" />
<SplineElement x="0" y="2679.331" op="+" />
<SplineElement x="0" y="3143.688" op="+" />
<SplineElement x="0" y="3646.775" op="+" />
<SplineElement x="0" y="4126.55" op="+" />
<SplineElement x="0" y="4630.631" op="+" />
<SplineElement x="0" y="5204.9" op="+" />
<SplineElement x="0" y="5624.875" op="+" />
<SplineElement x="0" y="5862.15" op="+" />
<SplineElement x="0" y="5965.6" op="+" />
<SplineElement x="0" y="5890.85" op="+" />
<SplineElement x="0" y="5726.587" op="+" />
<SplineElement x="0" y="5560.975" op="+" />
<SplineElement x="0" y="5368.55" op="+" />
<SplineElement x="0" y="5126.313" op="+" />
<SplineElement x="0" y="4925.725" op="+" />
<SplineElement x="0" y="4713.587" op="+" />
3.) Simple add the values from the first engine upgrade package to the default engine
Example :
Default Renault Engine first line : <SplineElement x="70" y="2005.52197265625" op="=" />
First Upgrade Renault Engine first line : <SplineElement x="0" y="19.10019" op="+" />
2005.52197265625 + 19.10019 = 2024.62216265625
4.) So, your first line of the default Renault Engine from Red Bull should be looks like this :
<SplineElement x="70" y="2024.62216265625" op="=" />
5.) You need the same procedure for the next 24 lines and you´´ll be done
Engine Default Values Line 2 + Engine first Upgrade Values Line 2
Engine Default Values Line 3 + Engine first Upgrade Values Line 3
.....
.....
.....
.....
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If you want to make the Renault Engine much more stronger use Tier 2-5 Upgrades instead.