Post your dyno curve here

[QBee]

And anyone with a Chim 400 would be pleased with that BHP number.....glad the track car is giving you so much pleasure.

[phazed]

[ed_crouch]

Evening all. Quick question:

4.6 crossbolted engine in my Chim (replacement engine - car was originally a 4.0...). It was built by RPi about 10kmiles ago, and is standard except for a Piper 285 cam and a tornado chip. Standard 94mm pistons, standard lifters, standard heads, all that guff.

Its not in a condition to go on the dyno at the moment as I'm in the midst of some significant work on it.

What sort of power and torque should I be expecting it to make? 260hp/280lb ? Also what VE should I be expecting at the peak torque point? An old Rover nail probs wont make more than 75%VE normally aspirated? Its hardly a Type R engine....

Im considering swapping the PAS pump for a much BETTER pump. A pump with Rotrex written on it... I'm trying to decide which Rotrex to spec. We're *probably* into C38 territory, but which trim?

Any sage advice would be appreciated, thank you.

Ed.

[hoofa]

Either a c38-81 or bigger c38-91 or full fat c38R

[QBee]

hoofa said:

Either a c38-81 or bigger c38-91 or full fat c38R

What bhp and torque will his standard engine take before admitting defeat, Nigel?
Just asking for the OP's sake because I remember forged and billet David of our mutual acquaintance having to strengthen his engine considerably in order to take the 470 bhp his supercharger develops.

I have restricted my turbo to under 400 bhp in order to avoid meltdown with my standard engine.
That suits me fine because I wanted mine suitable for track days, and the limit of my driving ability at full throttle at Cadwell Park is under 400 bhp

[Griff22]

Supercharged 5.2 litre TVR Griffith uprated with stock SC Power Rotrex supercharger system and engine MBE ECU.
A project to determine what power can be is achievable from a TVR V8 engine.
Supercharged engine specifically built by Powers Performance. Engine High spec, 5.2 Litre, reduced compression, cross bolted with wired copper head gaskets. Crank, conrods and pistons supplied by John Eales.
Historically I have always understood the maximum achievable power due to cylinder head limitations was approximately 550BHP, irrespective of whether forced induction or natural aspirated engine.
Car previously uprated with Uprated T5 Gearbox, Triple plate Super Clutch, Gas Pro shocks and AP Racing front brake designed to fit within the stock fifteen-inch rims, larger diameter anti roll bars, cockpit roll over hoop and SC Power aero kit.
MBE ECU fuelling was mapped by Torque Developments International in Thurrock using their hub dyno system.
Rotrex C38-92 Supercharger fitted with 85 mm pulley @ 6000 rpm.
My thanks go out to Dom and Jason for building such a strong engine, am very pleased with the quality of installation.


Rear Wheel BHP shown equates to approximately 588 Flywheel BHP

[Classic Chim]

Griff22 said:

Supercharged 5.2 litre TVR Griffith uprated with stock SC Power Rotrex supercharger system and engine MBE ECU.
A project to determine what power can be is achievable from a TVR V8 engine.
Supercharged engine specifically built by Powers Performance. Engine High spec, 5.2 Litre, reduced compression, cross bolted with wired copper head gaskets. Crank, conrods and pistons supplied by John Eales.
Historically I have always understood the maximum achievable power due to cylinder head limitations was approximately 550BHP, irrespective of whether forced induction or natural aspirated engine.
Car previously uprated with Uprated T5 Gearbox, Triple plate Super Clutch, Gas Pro shocks and AP Racing front brake designed to fit within the stock fifteen-inch rims, larger diameter anti roll bars, cockpit roll over hoop and SC Power aero kit.
MBE ECU fuelling was mapped by Torque Developments International in Thurrock using their hub dyno system.
Rotrex C38-92 Supercharger fitted with 85 mm pulley @ 6000 rpm.
My thanks go out to Dom and Jason for building such a strong engine, am very pleased with the quality of installation.


Rear Wheel BHP shown equates to approximately 588 Flywheel BHP

That’s pretty damn impressive.
Congratulations.

[Sardonicus]

Classic Chim said:

Griff22 said:

Supercharged 5.2 litre TVR Griffith uprated with stock SC Power Rotrex supercharger system and engine MBE ECU.
A project to determine what power can be is achievable from a TVR V8 engine.
Supercharged engine specifically built by Powers Performance. Engine High spec, 5.2 Litre, reduced compression, cross bolted with wired copper head gaskets. Crank, conrods and pistons supplied by John Eales.
Historically I have always understood the maximum achievable power due to cylinder head limitations was approximately 550BHP, irrespective of whether forced induction or natural aspirated engine.
Car previously uprated with Uprated T5 Gearbox, Triple plate Super Clutch, Gas Pro shocks and AP Racing front brake designed to fit within the stock fifteen-inch rims, larger diameter anti roll bars, cockpit roll over hoop and SC Power aero kit.
MBE ECU fuelling was mapped by Torque Developments International in Thurrock using their hub dyno system.
Rotrex C38-92 Supercharger fitted with 85 mm pulley @ 6000 rpm.
My thanks go out to Dom and Jason for building such a strong engine, am very pleased with the quality of installation.


Rear Wheel BHP shown equates to approximately 588 Flywheel BHP

That’s pretty damn impressive.
Congratulations.

Seconded fantastic stuff, I know what those kinda numbers feel like in one of these cars too

[Boosted LS1]

Here's one I built, basically a sleeved 4.6 so now a 4.8. Last I heard it's at 600 hp but the turbo's were maxed out so larger units were ordered. Stock crank, custom made rods, forged pistons with skirt and crown coatings, DLC coated piston pins and a gapless ring pack. No matter how much I try the image still shows the wrong way despite being horizontal on my pc, sorry about that. It was at 8 psi boost but needed a lot more to get to 600.


And here.the last graph I saw:

Edited by Boosted LS1 on Friday 8th March 18:32

[Sardonicus]

Here you go Boosted

[Boosted LS1]

^ Thank you. It's easier to look at now :-)