Cerbera Rolling Road Results (4.2 now 4.5)

[Joyceyboy]

Morning all,

Last weekend I stuck my Cerb on the rollers.

I bought her two months ago and she had been laid up for many years with a blown engine. Originally she was a 4.2 but just before I purchased the her, the old owner fitted a freshly built 4.5 (later block) but re fitted the 4.2 inlets. From the invoice I have, some of the internals have been uprated too.

In the last 2 months I have managed to cover 2000 miles , not quite trouble free but good to iron out all the niggles.

So now I know the engine is running well, what other little tweaks can I do to improve its ability?

Figures are at the wheels.




Lee

[gruffalo]

Interesting, what was the Flywheel HP calculated at?

Charlie normally gives both graphs out.

[Joyceyboy]

We verbally spoke about the 10% rule which comes to 423bhp?

Lee

Edited by Joyceyboy on Monday 9th November 13:06

[Vixpy1]

Its at the flywheel Lee.. Wheels was around 320bhp

[Joyceyboy]

Really? I must of misunderstood what you said. Plenty of room to tinker then.

Lee

Edited by Joyceyboy on Monday 9th November 13:06

[Vixpy1]

'He' is me

[Jhonno]

Could do with a trip to Jools!

[ukkid35]

Jhonno said:

Could do with a trip to Jools!

Yes, but make sure the valve shims are done first.

More importantly if you do a tuning session on Joolz rollers, that will test the cooling system, and exhaust manifolds, to the limit, so make sure there are no weak points.

[300bhp/ton]

gruffalo said:

Interesting, what was the Flywheel HP calculated at?

Charlie normally gives both graphs out.

You mean guessed at. You can't reliably calculate flywheel HP off of a chassis dyno.

And even the figure you come up with won't be comparable to anything else, as different dyno's work in different ways, plus a million other variables.

Even comparing RWHP figures for the same car from different dyno's is pretty meaningless.

[FarmyardPants]

385 is an interesting number for a 4.5, being somewhere in between typical oem and remap. Could be a mapped car with cats in I guess.

Edit: from the smooth curve it does look like it's been mapped

[Joyceyboy]

It has a SP performance exhaust system plus some uprated internals. The engine came from some guys that race TVR's.

Lee

[julian64]

Joyceyboy said:

It has a SP performance exhaust system plus some uprated internals. The engine came from some guys that race TVR's.

Lee

All owners race TVRs

[Gazzab]

What internal changes were made? If it had head work eg CR, porting etc then the figure should be higher really.

[gruffalo]

4.2 Induction don't forget.

[Byker28i]

nice smooth curve.
Always good to find out that extra 300cc is worth 5bhp