Rally2 (ex-R5) News

[br21]

Is 300 hp and 450nm far off the truth for a Rally2 upgraded car?

No, it's close, real figures are bit higher, but depends on fuel of course.

[Sulland]

What kind of different fuels can they be mapped for?

And how much does a race fuel add?
Is e85/flexifuel allowed in Rally2?

[Steve Boyd]

What kind of different fuels can they be mapped for?

Fuel requirements are covered by FIA Appendix J Article 252 Art. 9 on page 6, here:
https://www.fia.com/sites/default/fi...2019.12.04.pdf

[Sulland]

How much difference in price per liter is there btw the racefuels and pump price of 98 octan?

[TheFlyingTuga]

How much difference in price per liter is there btw the racefuels and pump price of 98 octan?

In here (Portugal), the racefuel cost around 5/6€ per litter. 98 special (ultimate, evologic and so on) goes around 1.70€/l so it's a big difference.

Cannot say for sure, but in our old lancer, the use of 98 oct or race fuel only gave us about 6/7 more bhp and 3% more Nm, however, the engine temperatures were much better with race fuel. We used the Sunoco one that is said to be the better one for that type of cars.
For instance, we tried the ETS for two races, and twice we blown up the turbo on the car, so, even between racing fuels there are differences.
I do believe that for most R5/Rally2 you either use Elf or VP tho.

[dimviii]

Cannot say for sure, but in our old lancer, the use of 98 oct or race fuel only gave us about 6/7 more bhp and 3% more Nm, .

without altering the engine map i suppose?

[TheFlyingTuga]

without altering the engine map i suppose?

You need diferent maps for diferent fuels (street to race and vice-versa) But same parameters as before. The combustion is better with Race fuel and a lot cleaner, there's where you got the gains.

[dimviii]

you have to alter the map properly to see the real advantage of the race fuel.
The gains you saw are almost nothing,probably due to not good altered map.

[br21]

I think most powerful fuel for R5 now is ETS. Some other are quite close, some other are not much better than 102 pump fuel (but are more stable). If I remember correct difference between Pb98 and proper race fuel was some 7% in case of R5

[Mirek]

You need diferent maps for diferent fuels (street to race and vice-versa) But same parameters as before. The combustion is better with Race fuel and a lot cleaner, there's where you got the gains.

I have very old (13 years old) dyno measurements from an Evo IX with 100 octane stock fuel (from that time) and 102 octane race fuel, both with the old 32 mm restrictor (gr.N rules from that time). The dyno is from one of the most well known tuners from here who at that time was also doing rallies himself. The graphs give 255 Hp/489 Nm for 100 octane stock fuel and 278 Hp/565 Nm for 102 octane race fuel. Also the torque peak for the race fuel is roughly 200 rpm lower and the power band is a bit wider.