Todays Dyno Result (400)

[roysum]

I know you lot are fed up with plots, but here are some more
Basically the top end has been modded...... big bore induction, 72mm plenum, 45mm trumpets and larger induction manifold, insulator, heads opened up to gaskets, and other head work, best guess tornadoe chip, pre cats removed, act y piece.
Lots of work for 21bhp !!!! (but not bad for a 400 I reckon)

Roy

Before


After

Edited by roysum on Friday 4th March 20:26

[SILICONE KID]

Im sick of people putting there dyno figures on here,Why do they do it!..Is that a lawn mower engine

[roysum]

SILICONE KID said:

Im sick of people putting there dyno figures on here,Why do they do it!..Is that a lawn mower engine

That was just the starter motor

[blitzracing]

Dont worry Daz, at least he managed to afford the petrol for the rolling road.

[SILICONE KID]

The way things are going with work and fuel prices i think the budget will be 10 miles a week.What are we going to do ?I got 19.5mpg on a steady run but its going back next week for tweaks..I bet your chuffed to bits with that for a 4l

[LordGrover]

More than respectable for a 400 and smooth curves too. Nice one.

[HarryW]

Ask Mark to put a bit more fuel in the generic chip above 5k5rpm for you, looks like it's leaning out a bit, perhaps your mods are flowing more air than Mark expected them too, even try and send him a copy of the plot.

[Simon says]

Nice one Roy,bet your pleased with that makes a change to see a descent figure from the 4.0 RV8 rather than you know whos dyno results ,,,,,,,, well done

[Alexdaredevilz]

HarryW said:

Ask Mark to put a bit more fuel in the generic chip above 5k5rpm for you, looks like it's leaning out a bit, perhaps your mods are flowing more air than Mark expected them too, even try and send him a copy of the plot.

Agreed, you would of hit 250bph easy with that corrected

[dbv8]

Excellent result for a 400.
Enough grunt to run a low 13

[roysum]

dbv8 said:

Excellent result for a 400.
Enough grunt to run a low 13

I'm sure my driving ability will put pay to that !

Thanks for all the good comments folks !

Roy.

[blitzracing]

HarryW said:

Ask Mark to put a bit more fuel in the generic chip above 5k5rpm for you, looks like it's leaning out a bit, perhaps your mods are flowing more air than Mark expected them too, even try and send him a copy of the plot.

Personally I would start with a check on the fuel pressure at peak RPM to see if its dipping before worrying about the chip, but having said that a couple of bits from the bit about the Tornado chipping:

Fuel map range is extended from the current 5500 RPM upper limit, to 6000-6500 RPM where appropriate.

It is vital that the software is programmed with the correct maximum mass air consumption of the engine, known as airflow meter scaling. This is vital for good driveability and fuel economy especially on large capacity engines, and allows correct control of part throttle fuelling. Note that airflow meter scaling determines when the top of the fuel map is reached. When using an engine of larger capacity than the software was designed for, the top of the map will be reached too soon. This leads to over-fuelling at part throttle, and under-fuelling at full throttle.