The effect of uprated CAM's on the Mustang & just ordered a couple more mods !! :D

Gibbo

Gibbo

Gibbo

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Hi there

Not really a mod I am thinking of doing but my god does it sound awsome, especially at idle:-

Video 1

Video 2

Such CAMs in the Mustang seem to reward approx 60BHP gains, maybe less or maybe a little more. But loosing 20-30Lb-Ft torque is also common with them.

I do like the sound and the BHP improvements up on the top-end is nice but loosing torque is bad and I imagine that fitment of such things is not so simple unfortunately, plus then it all needs tuning......

Still what a glorious sound. :D

Well I've just treated myself anyway. De-Cats, Lightweight steel driveshaft (26lbs lighter than current one) and 4:10 differential have just been ordered. Stick a good driver (never done 1/4 drag before) in my car and it will then manage the 1/4 mile in 12.5-12.7s in its current trim plus these new mods. Smaller, lighter wheels with stickier tyres would see maybe 12.3-12.5s but to me the dragstrip is not really important but in the US they seem to live for it. :D
For those wondering with 4:10 gears in place with a good launch 0-60 can be done in around 4.4s thats pretty good for a RWD American muscle motor but most of all it will make the box a lot more usable. My current 3:55 gear really are a bit long so shorter gears will make the box more usable and the cars in-gear acceleration a hell of a lot quicker.
 
Gibbo, with a 4.10 axle what rpms will you be turning (roughly) in top gear at 70mph? I would go look it up, but on account of being exceedingly drunk I can't actually be bothered :)
 
Gibbo said:
Aint got a clue or have I made a mistake?
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'tis alright Gibbo, he's just being silly as you're capitalising cam (as if it's an acronym, rather than being short for camshaft).
 
JRS said:
Gibbo, with a 4.10 axle what rpms will you be turning (roughly) in top gear at 70mph? I would go look it up, but on account of being exceedingly drunk I can't actually be bothered :)
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Hi m8

Right got the spreadsheet open:-

As my car has 275/45/20 tyre/wheel size that further increases top end and my speedo is calibrated for this too. :)
Here are the speeds:-

70mph in 5th with 3:55 gears is 1900rpm
70mph in 5th with 4:10 gears is 2200rpm

For me that is fine as it is I hardly use 5th anyway because its just too long.

Another example, this time 80mph in 4th:-
80mph in 4th with 3:55 gears is 3200rpm
80mph in 4th with 4:10 gears is 3700rpm

Another example, this time 50mph in 3rd:-
50mph in 3rd with 3:55 gears is 2650rpm
50mph in 3rd with 4:10 gears is 3050rpm

My cars rev limiter is 6800rpm, it makes peak power at approx 6400rpm. So I believe as most of my driving is mainly city and short sprints and I do like pressing the loud pedal and stirring the gear box plenty I think these gears will make the car more usable and it will transform the acceleration. :D

Another quick summary:-

Gear / 3:55 top speed / 4:10 top speed (6400rpm I have used for top speed, even though it revs to 6800 I don't like doing that)
1st / 47mph / 41mph
2nd / 80mph / 69mph
3rd / 121mph / 105mph
4th / 159mph / 138mph
5th / 236mph / 204mph

As you can see the current top speeds in each gear at 6400rpm are just too long and even though the engine has the power/torque to quickly get through the box moving to a 4:10 differential is just gonna make it oh so much quicker. :)
 
Deffo need shorter diff ratio. Can't believe how long geared it was when me and Drex were sat in the back sweating our asses off with the heaters on full blast at Powerstation :eek:

Do it, probably make more difference than a lot of power mods.

As you prob know, it's a popular mod on S2000s in america due to the difference it makes. Prob 0.5 sec on the quarter
 
Gibbo said:
70mph in 5th with 3:55 gears is 1900rpm
70mph in 5th with 4:10 gears is 2200rpm

...........

Another quick summary:-

Gear / 3:55 top speed / 4:10 top speed (6400rpm I have used for top speed, even though it revs to 6800 I don't like doing that)
1st / 47mph / 41mph
2nd / 80mph / 69mph
3rd / 121mph / 105mph
4th / 159mph / 138mph
5th / 236mph / 204mph

As you can see the current top speeds in each gear at 6400rpm are just too long and even though the engine has the power/torque to quickly get through the box moving to a 4:10 differential is just gonna make it oh so much quicker. :)
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Right. Cheers for that Gibbo. Still pretty tall gearing isn't it? Not a bad thing considering fuel costs these days! The ratios you have in the gearbox seem to be pretty decent for acceleration without being so short as to be un-useable though.

As for not liking revving it to 6800rpm - a friend of mine has a '69 Dodge Charger Daytona with a 528ci Hemi that will rev to 9000rpm. I can confirm that it''ll rev that high as I was in it when the lunatic actually decided to try it..... :eek:
 
Simon said:
Deffo need shorter diff ratio. Can't believe how long geared it was when me and Drex were sat in the back sweating our asses off with the heaters on full blast at Powerstation :eek:

Do it, probably make more difference than a lot of power mods.

As you prob know, it's a popular mod on S2000s in america due to the difference it makes. Prob 0.5 sec on the quarter
Click to expand...

Yeah it pulled 245km/h on the dyno run in 4th with you guys weighing it down, think thats approx 155mph. :)
The shorter gearing will definetely help and yeah the US guys rate the differential change as the 2nd best mod on the Mustang. 1st place mod been a CAI and custom tune as the custom tune does so much for these cars. :)
 
There must be something shorter than a 4.10 available - 4.54 would be good for the Traffic Light GP :)
 
JRS said:
There must be something shorter than a 4.10 available - 4.54 would be good for the Traffic Light GP :)
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There is think there is also 4.30 and 4.56 but for me 4:10 is going to be a drastic improvement. Plus I want to stick to Ford gears and as such Ford gears are only available in 3:55, 3:73 and 4:10 for the manuals. :)
Would not want to risk a 3rd party and plus 4:10 is short enough for me. :)
 
cheets64 said:
How many mods is that, could'nt you of just bought a faster car.
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Probably, but its a mustang, says it all IMO :)

Doesnt sound as nice at idle as the last vid of yours, but its a nice power increase.
 
cheets64 said:
How many mods is that, could'nt you of just bought a faster car.

And one that handles ok.

And at idel it sounds ill.
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Its quite a lot of mods.....

Buy a faster car? Nope! Its a Mustang and Ford gave it plenty of power but they also made it with great tuning potential in mind.

Handling? I've not changed a thing here as that is an area where it needs no improvement as it handles extremely well, far better than my previous Mitsubishi 3000GT.

As for mods, well I've done quite a lot, but these cams I shall not be doing, to much involved and you loose torque.

My mods are:-
Cold air intake
Race tune and remapped for RON 98 fuel
Saleen Under Drive Pulleys (already fitted by Saleen as STD but a mod over Fords STD specificarion)
Charge Motion Delete Plates
Bassani Long Tube Headers
Bassani X-Pipe
Saleen Cat back exhaust (again fitted by Saleen as STD)
Bassani DE-CATS
Lightweight steel driveshaft
4:10 rear differential.
Saleen racecraft suspension (Fitted by Saleen as STD)

I've fitted all the parts myself, accept for the exhaust and shall be getting the rear differential done by a mechanic as well.

The fact is the above lot has cost me approx £2000 including any labour but I've increased the output from the STD 300BHP/315Lb-Ft to more or less 400BHP/370Lb-Ft. Plus when you do it yourself and it all works it puts a big smile on my face. In real world performance terms this now means my car can more or less cover the 1/4 mile nearly a whole second quicker and that the terminal at the 1/4 mile is approx 10mph quicker.

For reference with a decent driver the car should be able to do the 1/4 mile now in approx 12.6s with a terminal of approx 112mph. Now you go compare that against other cars and you will see its very quick and then remember this is car is a Mustang, its rare, huge heritage, holds its value and including mods only cost me 28k. I am very happy with it! :D
Basically if I bought a 600BHP car, I'd still pull it apart and look for more power because its my nature to pull things apart and try to extract more safely. :)
 
Whats the Turning circle on of of these like :p

And when is the Supercharger going to be bought :D :cool:
 
Gibbo, can you not lower the compression ratio after the cam is fitted to minimise the loss in torque?. Thinner (but stronger) HG normally does the job.
 
Oxbow said:
Gibbo, can you not lower the compression ratio after the cam is fitted to minimise the loss in torque?. Thinner (but stronger) HG normally does the job.
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Noob Question. Wont the Lower Compression ratio make it bad if he wants to supercharge it?

All this compression ratio still does my head in :(
 
Oxbow said:
Gibbo, can you not lower the compression ratio after the cam is fitted to minimise the loss in torque?. Thinner (but stronger) HG normally does the job.
Click to expand...

A thinner one will increase the CR
 
Zip said:
Noob Question. Wont the Lower Compression ratio make it bad if he wants to supercharge it?

All this compression ratio still does my head in :(
Click to expand...

No it will generally help. The static compression ratio is fixed by the engine but when you use forced induction the dynamic compression ratio will increase because you are forcing more air in the engine above atmospheric pressure. If you lower the static compression ratio whilst increasing the boost through forced induction, you will potentially reduce the chance of detonation.

This is why when you look at the compression ratio of the NA cars compared with a turbo car the NA one is much higher than a turbo. This is also what contributes to the turbo cars sluggish feel off boost, that and the fact you have a big restriction in the exhaust. :D
 
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