450 upgrade advice

[ctsdave]

Hi all,

Our 450 road car is in need of a new cam I suspect (can hear it ticking!). Other issues with the engine are shunting more than it used to and also using lots of fuel (even when sat at 70mph on a motorway run). Thinking this must be something within the injection (any tips???)

Anyway, what cam would people recommend? We had the car dyno's 2 years ago and made around 255/260 flywheel bhp so not bad for a std car! Wanting to get it up to an honest 300ish (mam will be driving it too so can't go too daft lol).

I've read about stealth cam? Is this better than say a Kent? Also, heard something about a Jag throttlebody being better than what is on as std? All ideas/advice greatly received.

Ta

Dave

[Mr Haribo]

Hello Dave
I have a 450 and im running over 320bhp,
first of all how much do you want to spend ?
I run a stealth cam from v8 developments seems to be smooth enough
I also have ported inlet manifold & stage 3 heads with larger throttle body all v8d
to be honest with all that should be enough for the big 300 ! plus fueling !
I have spent more but only had small gains

[ctsdave]

Thanks for the replies chaps! Not looking to spend vast amounts really - got a race car with a 3.9v8 and gen 380bhp for serious fun Don't need massive amounts to have fun on the road really, and it won't be trackdayd, just road use I expect! I know the car needs a cam, so other things at the same time that won't cost fortunes to buy make sense, such as smooth bore ACT stuff (though if it's just a case of a big pipe, I'll be able to source that myself easier??)

Spend - can't sell it, it's been part of the family for over 10 years now - was dad's toy until Cancer sadly got the better last year so it's not going anywhere!! Same as the Griff racer, we built it but he couldn't even manage the full season in 2009 due to ill health....

Dave

[450 Paul]

If you are looking at cost effective improvements I would start with the smooth bore pipe to the airflow meter and the elbow from the meter to the throttle.

I have a few engine and head upgrades from V8D and kept the standard cam and have 330bhp and 350lbs ft torque so I am a fan of the std 4.6 cam. I replaced mine and got it from TVR Power.

Then you could look at the Torque V8 airflow meter package.

Happy driving

[ctsdave]

Cheers again guys. It's meant to be a HC version I beleive and the only 'mod' so far was a lighter flywheel when we gave it a bit of an overhaul, but the engine didn't come out. Does anyone know what duration the stealth cam is then? Much different from normal?

Also, I've got a 500 plenum sat in the garage - is this any better than the 450 or are they the same?

[ctsdave]

Thanks spend - might hav the full lot sat there thinking about it... We bought a 5.0 engine from a fired car but the injection wiring/injectors etc aer all a little worse for wear. Not sure what the trumpets are like though... Will be worth a measure I suspect, as will an inspection of the inlet!

Going to put the 5.0 onto a holley as it's destined for an MGB Roadster now hehe (well, once I find enough time to get it sorted anyway!!)...

[Podie]

Hello, V8D?

[ctsdave]

Podie said:

Hello, V8D?

LOL... OR, as we've done in the past, "hello, John Eales..."

[ctsdave]

Thanks Spend - that is an option like to swap it all over and put the 450 heads etc onto the 5.0. Sounds from this though that the main thing to look at is the induction side (smooth bore etc). Is the std AFM causing much of a restriction? Is there an alternate from another vehicle that can be fitted in its place or something like the torque flow mentioned the way to go?

Sorry for all the questions - used to working with carbs!!

[Podie]

ctsdave said:

Podie said:

Hello, V8D?

LOL... OR, as we've done in the past, "hello, John Eales..."

Your pockets must be deeper than mine!

[ctsdave]

Nah, we just buy the bits! Used John for stuff on the racer for many years and he's alwyas been fair!