Putting a Dawes on a Twin Turbo?
22 January 2003, 01:08 PM
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'twinturbo' on the yahoo groups legacy-b4 has done it or something similar. Here's his web site http://au.geocities.com/twinturbosubaru/
Fitting one will give you the same boost limit for both primary & secondary modes. The ecu in most BG5 revisions will keep the boost lower in the primary mode possibly to avoid the dreaded overspooling of the primary. Each revision has a slightly different turbo setup - see my file EJ20.html on legacy-b4 group. Different revisions might be more or less susceptible to overspin. What's the model number of yours?
If you do it I think the same caveats that apply to Imps apply also but maybe more so; ie fit a Knocklink or similar and a boost gauge as a minimum and maybe even egt & afr if you want to increase boost. Remember the ecu cant reduce boost once you've fitted a Dawes.
The advantages are same as Imps - more boost if you want it and possibly more stable boost control than with the 2-port boost solenoid.
I don't feel like risking it, but I'm looking at electronic options.
How are you getting on with 5th gear mod?
Duncan
Fitting one will give you the same boost limit for both primary & secondary modes. The ecu in most BG5 revisions will keep the boost lower in the primary mode possibly to avoid the dreaded overspooling of the primary. Each revision has a slightly different turbo setup - see my file EJ20.html on legacy-b4 group. Different revisions might be more or less susceptible to overspin. What's the model number of yours?
If you do it I think the same caveats that apply to Imps apply also but maybe more so; ie fit a Knocklink or similar and a boost gauge as a minimum and maybe even egt & afr if you want to increase boost. Remember the ecu cant reduce boost once you've fitted a Dawes.
The advantages are same as Imps - more boost if you want it and possibly more stable boost control than with the 2-port boost solenoid.
I don't feel like risking it, but I'm looking at electronic options.
How are you getting on with 5th gear mod?
Duncan
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