AJP 4.2versus 4.5

[gun metal]

Can someone tell me why there is a big difference between these two engine's.
The difference between 4.2 and 4.5 is not thathigh , but the difference between the BHP is 360 versus 420.

[Toady1]

ive been told that tvr were very ott with their figures for the 4.5, and that the 4.2 produced around 340-360 and the 4.5 around the 350 mark? but im not too sure on this, as like i said ...i was just told!lol! so as im looking at getting a cerb soon, id like to know the real answer to this Q too!

[gun metal]

Toady1 said:

ive been told that tvr were very ott with their figures for the 4.5, and that the 4.2 produced around 340-360 and the 4.5 around the 350 mark? but im not too sure on this, as like i said ...i was just told!lol! so as im looking at getting a cerb soon, id like to know the real answer to this Q too!

Is the misanderstanding that the AJP of the tuscan racer got 420 bhp

[trackcar]

the tuscan racer is much higher than 420 bhp .. it got proper mapping and decent exhausts. try 450bhp.

[JR]

Some power figures from the RR day:

DuncanM said:

As per the rolling road day : 4.2's 1.Carbon Al. …….360bhp – 320 lbs torque (Emerald ECU) 2.Longbow……… 359bhp – 330 lbs torque 3.Slvrcrb………. 351bhp – 332 lbs torque 4.Jonnie5……….. .348bhp – 333 lbs torque 5.David.S………... 345 bhp – 327 lbs torque 6.Jellie…………… 336bhp – 340 lbs torque

[nelly1]

JR said:

Some power figures from the RR day: DuncanM said: As per the rolling road day : 4.2's 1.Carbon Al. …….360bhp – 320 lbs torque (Emerald ECU) 2.Longbow……… 359bhp – 330 lbs torque 3.Slvrcrb………. 351bhp – 332 lbs torque 4.Jonnie5……….. .348bhp – 333 lbs torque 5.David.S………... 345 bhp – 327 lbs torque 6.Jellie…………… 336bhp – 340 lbs torque

Pah! - Get yourself a Sp6......








....I'll get me coat!

[Cyclone1]

nelly1 said:

JR said: Some power figures from the RR day: DuncanM said: As per the rolling road day : 4.2's 1.Carbon Al. …….360bhp – 320 lbs torque (Emerald ECU) 2.Longbow……… 359bhp – 330 lbs torque 3.Slvrcrb………. 351bhp – 332 lbs torque 4.Jonnie5……….. .348bhp – 333 lbs torque 5.David.S………... 345 bhp – 327 lbs torque 6.Jellie…………… 336bhp – 340 lbs torque Pah! - Get yourself a Sp6...... ....I'll get me coat!

Good figures...but still not enough to keep up with a remapped 4.5........

[Steve_T]

Here's why the AJP8 hits so hard - check the difference in the early part of the torque curve for an AJP8 Cerb compared to the Speed6. The torque comes in earlier and varies much less.



The graph shows at the wheel comparisons, there's no flywheel figures on the graph

>> Edited by Steve_T on Friday 19th August 09:22

[nelly1]

Steve_T said:

Here's why the AJP8 hits so hard - check the difference in the early part of the torque curve for an AJP8 Cerb compared to the Speed6. The torque comes in earlier and varies much less.

Fair point - that is an awesome torque curve

I wonder how much of that characteristic is down to two-valves-per-cylinder?

>> Edited by nelly1 on Friday 19th August 10:08

[Toady1]

nice! thats a real punch you in the back torque curve!