Cam timing mod

[verba1]

does anyone know at what sort of bhp and torque figures that you need to do the m400 cam timing mod ? and do you lose the full on boot in the back of the standard 3r set up ?
cheers

[mrpbailey]

I had this done when my car went just over 400bhp & 400lbft.
Still got the boot in the back, probably more so than now i'm running at 500bhp, although the power comes in earlier and stays on for longer

Paul

[JBliss]

what spec are you running for 500bhp Paul?

[Hollowpockets]

I had it done to help take the car from 500 to 550bhp.

Go for it

Andy is right, you'll need valve springs above 450-475ish and arp bolts, helix clutch etc etc

Edited by Hollowpockets on Tuesday 22 October 17:33

[andygtt]

doing the cam timing will depend on spec, for example if you do not have upgraded valve springs it will be horrible as I did this early on and it ruined the car.

what spec is the engine now, and what do you plan?

[JBliss]

my plan for the winter is

Valve Springs
Timing mod
Injectors
GT28's

Should get me to 490bhp. Going to forge the engine but not til next winter. Got 6 speed uprated gearbox already in the car.

[mgbond]

JBliss said:

my plan for the winter is

Valve Springs
Timing mod
Injectors
GT28's

Should get me to 490bhp. Going to forge the engine but not til next winter. Got 6 speed uprated gearbox already in the car.

Is this on a 2.5?

What would the timing mod do for a 2.5?

[LazyRoss18]

Can anyone elaborate on this mod? What is involved and what are the advantages / disadvantages?

[TuxMan]

Julian's car is a 3 litre .

Basically Noble adjusted the timing to take out some power to protect the drivetrain ect , they also had a issue with valve surge so a tweak too the timing in effect flattened out the power , this made the engine a bit flat over 6000 rpm , with the timing mod and valve springs the engine can be mapped right up to 7850 rpm and hangs onto the power longer .

[mgbond]

Would the same mod do anything for the 2.5. I already have uprated springs?

[951]

TuxMan said:

with the timing mod and valve springs the engine can be mapped right up to 7850 rpm.

If Trevor lets it

Mine still redlines at about 7300 rpm, which I'd really like to change!

[Hollowpockets]

951 said:

If Trevor lets it

Mine still redlines at about 7300 rpm, which I'd really like to change!

Can't remember exactly but think my limit is the same, not that it would make much odds, I always seem to keep the revs between 6 and 7k revs as any higher it just doesn't sound right or feel like I'm getting any benefit as the torque drops away.

[mrpbailey]

JBliss said:

what spec are you running for 500bhp Paul?

Just under 500, about 492bhp I think it was. Dave at Jetstream advised this as safe limit on standard engine internals.
Work all done by Jetstream earlier this year:

GT25rs turbo's inc. all water/oil lines
Uprated valve springs
High flow injectors
New stainless manifolds
Bosch Fuel pump
Extra engine oil cooler
Gearbox oil cooler & pump
Low mileage Mondeo Strengthened gearbox
Uprated Helix clutch
And mapped by Trevor

Previously had exhaust, m400 fuel pump, cam timing, intercooler etc for 407bhp.

Paul

Edited by mrpbailey on Tuesday 22 October 21:05

[JBliss]

Looks like I'll be going a similar route to you then but instead of gt25s I'll be going for the 28's.
What torque did you get? Bet it's pretty quick now!

[verba1]

andygtt said:

doing the cam timing will depend on spec, for example if you do not have upgraded valve springs it will be horrible as I did this early on and it ruined the car.

what spec is the engine now, and what do you plan?

engine is standard 3r , looking at upgrading ic , fuel pump , actuators and a remap ...

Edited by verba1 on Friday 25th October 19:19

[andygtt]

verba1 said:

andygtt said:

doing the cam timing will depend on spec, for example if you do not have upgraded valve springs it will be horrible as I did this early on and it ruined the car.

what spec is the engine now, and what do you plan?

engine is standard 3r , looking at upgrading ic , fuel pump , actuators and a remap ...

Edited by verba1 on Friday 25th October 19:19

As I say don't do the timing mod unless you also do valve springs.... Although the springs are onto a couple f hundred and it's nice when the engine revs a little more.

Don't go mad though as otherwise your turbos will run out of puff at top end as well, then your into real expense.

[Blu3R]

andygtt said:

verba1 said:

andygtt said:

doing the cam timing will depend on spec, for example if you do not have upgraded valve springs it will be horrible as I did this early on and it ruined the car.

what spec is the engine now, and what do you plan?

engine is standard 3r , looking at upgrading ic , fuel pump , actuators and a remap ...

Edited by verba1 on Friday 25th October 19:19

As I say don't do the timing mod unless you also do valve springs.... Although the springs are onto a couple f hundred and it's nice when the engine revs a little more.

Don't go mad though as otherwise your turbos will run out of puff at top end as well, then your into real expense.

This is almost exactly what Trevor told me when I had mine mapped.
If you want to do the timing mod you need springs first, and if you're doing both you're pushing the power range higher up the rev range which makes life harder for your turbos.
My view was the timing mod was the beginning of the ever spiralling cost to achieve ever decreasing jumps in power.

[verba1]

I quite like the map set up on this nob at Monza , whatever it is it seems quite addictive . Good vid too .

http://youtu.be/EHkwv0jG6Go