How powerful is your V6 S ?
Discussion
Today I took my modified 1989 S2 for a dyno run at Motorsport Developments, near the old factory. The key figures are : max flywheel BHP 193.4 @ 6250 rpm (loud!) ; max flywheel torque 199.6. Using the factory figures from my original handbook, those numbers are +15% and +17%. If the handbook dry weight figure of 940kg is correct, that equates to about 206 bhp per tonne.
How does that compare with others who have modified the 2.9 Cologne engine but left it naturally aspirated?
Briefly, the main mods are :
Full stage 2 rebuild many years ago by Specialised Engines in Essex, including fast-road cam, enlarged inlet/outlet valves, gas-flowed head and full engine balance. 15,000 miles since then.
Stainless manifolds & downpipes by RT Racing, about 15 years ago.
Factory free-flow stainless exhaust (bought 1997, still going!)
Magnecor ignition leads.
Recent new air-meters by Bosch ( £500, eek! )
Timing adjustment by Heath at XWorks (increased to 14 degrees advance).
Here's the data printout :
BOB
How does that compare with others who have modified the 2.9 Cologne engine but left it naturally aspirated?
Briefly, the main mods are :
Full stage 2 rebuild many years ago by Specialised Engines in Essex, including fast-road cam, enlarged inlet/outlet valves, gas-flowed head and full engine balance. 15,000 miles since then.
Stainless manifolds & downpipes by RT Racing, about 15 years ago.
Factory free-flow stainless exhaust (bought 1997, still going!)
Magnecor ignition leads.
Recent new air-meters by Bosch ( £500, eek! )
Timing adjustment by Heath at XWorks (increased to 14 degrees advance).
Here's the data printout :
BOB
Edited by frontfloater on Saturday 11th July 14:55
Here's my V8S figures for comparison (measured at the rear wheels)...
I recall that the V6 is notionally 170bhp.
I had my de-catted S3C dynoed a while back and it was down to 164.
Since then I had the injectors cleaned to try and solve a slow running issue and put on a new st st manifold as the old one was leaking- I did note that the flange welding on the old one was very poor, interrupting the flow.
With no other changes and as far as I am aware, no other mods, I had it retested on the same dyno- quite amazed at the improvement... see below
I had my de-catted S3C dynoed a while back and it was down to 164.
Since then I had the injectors cleaned to try and solve a slow running issue and put on a new st st manifold as the old one was leaking- I did note that the flange welding on the old one was very poor, interrupting the flow.
With no other changes and as far as I am aware, no other mods, I had it retested on the same dyno- quite amazed at the improvement... see below
Please be assured I didn't take it as criticism : I was just trying to re-focus the thread.
The big difference between your figures & mine is flywheel versus wheels. In reply to your question on another thread, the dyno did also give wheels figures, which reveal the gulf between us : BHP 154.4, torque 157.
BOB
The big difference between your figures & mine is flywheel versus wheels. In reply to your question on another thread, the dyno did also give wheels figures, which reveal the gulf between us : BHP 154.4, torque 157.
BOB
DamianS3 said:
I won’t post my Duratec graph then..
But I seem to recall a S with a cologne prodigies like yours but with increased compression (via skimmed heads) made over 200bhp (just) on 98 fuel at the flywheel.
Sorry can’t remember who’s car it was though..
Cheers
Damian S3 Duratec
Damian, I sent you an email, not sure it arrived. I’d like to make contact and talk engine conversions if you have a chance. ThanksBut I seem to recall a S with a cologne prodigies like yours but with increased compression (via skimmed heads) made over 200bhp (just) on 98 fuel at the flywheel.
Sorry can’t remember who’s car it was though..
Cheers
Damian S3 Duratec
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