Dyno?

[RICE RACING]

Originally Posted by Grizzly

Hi all.

I have recently had the Fd set up and when i received the Print out i noticed the Torque Curve sort of Drops off between 4500 and 5500 then Picks up again as the revs increase.



I am not too clued up on Dyno print outs but from what i have seen this looks like i have an issue or a Fault as it still does it on lower boost (its not very clear but big red line is 1 bar and just under it is a Yellow line which is 0.8 bar the lower lines where on a Different IC that was holding it back but the dip is still there)

A Basic Mod list:

PFC with Profec B2 Boost controller
Mild Ported Motor with 3mm seals
Hybrid 60-1 turbo (.96 hot side), HKS Divided manifold, 50mm WG
3" exhaust (decat)
Stock Primary Injectors and 1600cc secondary’s, Aeromoive FPR, 044 Pump
WI Injection ( 50/50 .6mm jet by the Throttles)
HKS Twin Power (10's and 11's Plugs)
Blitz FMIC

I was told by the Dyno operator that the dip was due to poor gas flow through the Manifold, but i have read that if the manifold had reached its peak flow the Torque wouldn't climb anymore?

Can anyone enlighten me as this is an Area i really know little about?

Thanks

The dip you see it totally in correlation with your Water/Methanol system kicking in at that point.

You do not need such a system at all (not even up to 1.3 bar boost pressure on T4 frame turbo's) as correct fuel richness levels and spark advance will suffice any effects towards detonation.

To run water injection without the associated dips you need to have the engine fully mapped for one or the other, you can not run your engine optimized for one and then expect it to run in another way with water injection you will always have non optimal result.

For a PFC or any other basic system you make the choice which way you want to go.
If you run a Life Racing, Syvec, or Motec ECU etc then you can have multiple strategies and different maps that all are tuned to allow different configurations for fueling and ignition mapping, and switch it as you see fit.

All of this is explained in great detail in my thread in members section or on the Aquamist site (only free source worth reading on the topic of water injection).