Went to the Rolling Road today.....

[CycleSi]

I took the Cobra to Surrey Rolling Road today and it recorded the following figures:

Naturally aspirated without Nitrous:

Flywheel - 408 bhp.
At the rear wheels - 334 bhp.
Torque - 496 lbft. (at 1000 rpm, it made 350 lbft).

With Nitrous:

Flywheel - 446 bhp (38 bhp increase, but it did increase by approx. 60 bhp lower down the rev range).
At the rear wheels - 367 bhp.

Torque - 587 lbft. YIPPEE !!!

This equates to 346 bhp per ton and 378 bhp per ton with Nitrous.

He also said the fuel curve was spot on so those endless hours of tuning have paid off.

You could say I'm kinda pleased with that.....

[wilf]

Nice fat torque curve, bet that's fun to drive. :thumb:

[Clarkson]

Originally Posted by BEB

I took the Cobra to Surrey Rolling Road today and it recorded the following figures:

Naturally aspirated without Nitrous:

Flywheel - 408 bhp.
At the rear wheels - 334 bhp.
Torque - 496 lbft. (at 1000 rpm, it made 350 lbft).

With Nitrous:

Flywheel - 446 bhp (38 bhp increase, but it did increase by approx. 60 bhp lower down the rev range).
At the rear wheels - 367 bhp.

Torque - 587 lbft. YIPPEE !!!

This equates to 346 bhp per ton and 378 bhp per ton with Nitrous.

He also said the fuel curve was spot on so those endless hours of tuning have paid off.

You could say I'm kinda pleased with that.....

Hi, What size NOS jets are you using?? 38hp not much??


Whats the spec of your motor??

[CycleSi]

The jets are supposed to be 75 bhp and it showed an increase of around 60 bhp at 3800 which then obviously tailed off at peak power.

I think I shall have a word with "Highpower Systems" and increase the jetting.

[Clarkson]

Originally Posted by BEB

The jets are supposed to be 75 bhp and it showed an increase of around 60 bhp at 3800 which then obviously tailed off at peak power.

I think I shall have a word with "Highpower Systems" and increase the jetting.

Whats the size of the motor?? 496lbft is a bit extreme??

[CycleSi]

409ci smallblock Chevy V8 (400 + .040),

Dart Pro 1 aluminium heads, 2.02/1.60 valves, 23 degree valve angle, 200cc intake ports, 64cc combustion chambers, 10:1 CR, Edelbrock Performer RPM intake, 36 degrees total timing, 18 degrees at idle, MSD 6AL ignition, MSD Pro Billet 85551 non vac.adv. distributor, KB hypereutectic pistons, 13 Hg idle vacuum, Competition Cams XE268H-10 hydraulic cam - duration @.050=224/230 and duration @.006=268/280, Holley Blue Top electric fuel pump, 1 3/4headers + sidepipes, Holley Powershot 14" air filter.

[Clarkson]

I see now 409ci!! thought it was a 350

Very mild cam you have fitted. What RPM/Torque did it peek at??

[CycleSi]

3600 rpm and 3200 on the gas.

[Clarkson]

Originally Posted by BEB

3600 rpm and 3200 on the gas.

Nice one! I think it peaks alittle to early.

[TonyD]

Sorry to be a bit of a killjoy but 409cu equals 6.7 litre and at 446 bhp with NOS the engine is only producing 66bhp per litre. Thats probably very respectable for an american engine, but thats only 2 bhp per litre more than a standard Toyota Yaris.............and with all the trick bits I bet the motor was't cheap !!

Inefficiency is ok when fuel is a dollar a gallon, but at £4.50 per gallon ? Add on the cost of the NOS shot and "you're havin' a larrfffff " ( Geddit, Nos.....Larff, oh never mind).

Cheers,

Tony