My XE nova on throttle bodies (Project 275+bhp)

[Gareth_C]

Looks like it is calibrated 500RPM short then, you can add about 6% for free Call it 246

Lol cheers mate I have been told that if anything a dyno dynamics reads a little under so maybe it's is nearly 250bhp

[MK999]

Sort out a cold air feed and I'm sure you'd see a pretty good improvement.

[Gareth_C]

Sort out a cold air feed and I'm sure you'd see a pretty good improvement.

Would you recommend an airbox of sorts or just some pipe to the filter

[MK999]

Enclosed airbox is definitely the best way as it's then a direct feed rather than relying on the cold air blowing enough to the filter if that makes sense, a well designed airbox will actually increase power as well.

[Jonlem]

Interesting plot. Where was peak power on the dyno sheet ?

Air filter can make a fair bit of difference to the power, not sure I'd expect to lose as much as you did though. Only thing I'm still puzzled by, how did it make nigh on 250 on the dyno and around 190 when you first run it at Speckys ? 230hp is very dissapointing power for the spec, I'd really want to be investigating where the power has gone as I know 230 is a lot but not on a engine of that specification IMO

Result on the rods btw, good service there from PEC

[Gareth_C]

Peak power was around 7500 for bhp and torque 5000

[david dixon]

I think that maybe because peak power is 7500ish cams are not making the most of the 2mm head, if the cams peaked the power at 8k+ then that power figure would be a lump more.

[BRoadGhost]

So many rod designs out there... even H sections can differ a great deal, could I ask how much a set of those are these days / and or how much you just paid?

Yeah looking at the graph that power curve is extremely similar to an old 8V I have with a piper 285 cam in it; aren't you on some really lairy profiles with solid lifters?

I need to get mine on a dyno to see the curve mine makes with AST1612's, but it feels how that looks.

[Gareth_C]

They are about £500 delivered and dave knocked a few % off mate the cams are piper pick up cams on solid lifter aswell

[steveboyslim]

Interesting plot. Where was peak power on the dyno sheet ?

Air filter can make a fair bit of difference to the power, not sure I'd expect to lose as much as you did though. Only thing I'm still puzzled by, how did it make nigh on 250 on the dyno and around 190 when you first run it at Speckys ? 230hp is very dissapointing power for the spec, I'd really want to be investigating where the power has gone as I know 230 is a lot but not on a engine of that specification IMO

Result on the rods btw, good service there from PEC

As the engine is comming back to me, I am going to see if I can get a deal to re-test the engine with the original map.
A pick up engine using smaller valves on carbs will make more power than what was seen on the rollers, so something is wrong.
With those cams and +2mm valves power to 8000+rpm with a gear shift point of about 8300rpm.
Blue sprint/Hart Power's engine dyno is thought to be accurate when compared with other engine dynos and rolling roads.

Steve