Astra Coupe Turbo 273bhp, but 25bhp less power with WI.

[MikeWarner]

Hi. I have a Mk4 Astra Coupe Turbo running 273bhp and 297lb.ft torque.

When I was on the rollers a few weeks back, we tried the car with and without WI (ERL 1s kit) and I lost around 25 to 30bhp at the top end of the revs. Lower revs seemed less effected, but as the revs rose, the losses increased.

I am running a single 0.5mm jet after the IC and I was running off standard washer fluid. The car over-boosts to 19.5psi and holds around 16psi.

If anyone can give me some advice on getting the most from the WI it would be much appreciated. Please note the car has not been mapped for WI and it is unlikely the I will do this in the future.

Here is the current power graph without WI. Cheers.