Help with Exhaust thrust from a 1900 hp car

[JackRE]

Looking for a little help on figuring out the thrust produced by the exhuast of a drag car.

Variables:
181 in^3 displacement 4 cyl
turbo charged at 58 psi
9600 rpm redline
Methanol fuel
2300 lb car
rear wheel drive
30" x 5" OD exhaust that comes out behind the front passenger wheel


The team is experiencing drift to the left when the front wheels leave the ground. The cars suspension is set up to deal with torque steer. Just looking for a ballpark figure.

Thanks in advance for any help.
Jack

 

[Bribyk]

I estimated around 50 lbs force using a very crude incompressible approach and your flow is going to be compressible at your exhaust velocity.

 

[MiketheEngineer]

Re-route the exhaust to dead centerline??

Even fifty pouds - assuming that is correct could easily throw the vehicle off especially if the front wheels are not touching the ground. Assuming a low profile vehicle - it might be like getting hit by a 40 mph wind or there abouts.

 

[Bribyk]

Point it upwards to help keep the front wheels on the ground (tough to do on the vehicles center line though). Top fuel cars run "zoomie" pipes pointed upwards to use this thrust as downforce.

 

[ivymike]

mdot*deltaV... the first is easy enough to calculate, and the second may be if you know your exhaust temp and nozzle dimensions.