Drove a new 4.7 this past weekend. The difference is night and day..the 4.7 is much faster. The 4.3 is not slow by any means but the difference in horsepower and torgue is signficant. The clutch and transmission feel a lot better too. Now I see why I refused to drive one because I did not want to become distracted from my 07. I understand that there are fewer 4.7s coming into the US. Anyhow, my question is with modifications to my 4.3, can I come close to the power and quickness of a 4.7? Or should I wait save up and try to find a pre-owned 4.7 before they get snatched up and the price goes up?? I'm just not seeing many out there now...convertibles even more rare.

 

You can go w/ the AM Power Kit or RSC tuning mod ... both add HP to the 4.3. I would like to find a 4.7 to run my modded 2007 4.3 against. I have a hybrid AM Power Kit/RSC SW; RSC 200 cell cats & open Touring exhaust; drilled (very open) air box w/ K&N filters; RSC springs, spacers; and brake cooling kit; new Hawk pads. I like the 4.7 very much but the sports suspension is still a little to "high" for me. Yes there is more power but I think my modded car has more. Now price ... new 4.7 vs used 4.3 w/ mods ... I think you can guess the answer there ...

 

The short answer is that no one really knows. There are a lot of claims from both owners and sellers but no one has actually stepped to the plate and shown proof, either video or dyno. In fact no one here has even run a 4.3 with mods against a 4.7 to see what would happen.

The 4.7 has a lot of mods besides just bigger displacement. It seems unlikely that all of that could be outdone by just adding a chip and cats to a 4.3. I had a chip on my supercharged car but later had the software removed. Before and after dynos were essentially unchanged. I would bet that if one of the modded NA cars was dyno'd they would find very little difference with a stock car.

 

How about the sound of the 4.7 without mods? Does it sound different at all? Significant difference?

 

How about the sound of the 4.7 without mods? Does it sound different at all? Significant difference?

Yes. I forgot to mention in my post. The 4.7 sounds deeper/heavier...well like a bigger engine. It still sounds unmistakenly like an Aston Martin but has almost has big block muscle car sound to it, but refined. Awesome sound; a too expensive sound for me right now..

 

Guess I have to find someone with a 4.7 to do another recording, plus buy a mic that handles the lower ranges better. The deep rumble is not easy to capture.

Then again, I know when I test drive the 4.7 I'll want one too...

 

I need to keep it into perspective. My 07 4.3 is an Aston Martin. It is still a quick car with more attributes than the competition. As for the 4.7, don't drive it...."don't bite the apple"....just walk away...I didn't and now my mind is smitten with that car.

 

There's really no difference in the sound between the two. Neither is a big block but they both have a great rumbly V8 sound. No offense, but I think you're kidding yourself if you feel there's a noticeable difference from the larger displacement. And if you really want a different sound, get an aftermarket exhaust...although IMO the only real advantage they have is the weight. Stock exhaust is so heavy you might think it's made out of lead.

 

Hi Tahoe. I could be totally wrong but I think you had an RSC ECU mod (ESX ordered it from us...) I would not expect the regular ECU map to make any difference whatsoever to a supercharged car, since the addition of the supercharger necessitates a secondary ECU to control the functions which are being changed with a NA ECU map. In effect, it would already have been 'remapped'. So with the greatest possible amount of respect, the fact that before and after dynos show no difference is not surprising, but does not reflect the results that you could expect to see on a non-supercharged cars.

 

I drove the 4.7 a week ago, here's my review of it: https://www.6speedonline.com/forums/...ml#post2770376

More or less, I'm never going to be able to buy a Vantage because once I can afford the model/specs I want, they introduce something new that I can't settle without. Currently, I can reasonably afford a 06 or 07, but since I'm still not sure I have enough room (6'6'') to drive a manual, need sportshift, which puts the price up to $85k. If I'm paying that much, then might as well go for the 09 with 4.7L and better rims. If I'm doing that, then might as well go for the beautiful body upgrades that the 2010 gets: https://www.6speedonline.com/forums/...-ive-seen.html

Can anyone reasonably estimate the cost to update a 2007 Vantage to the 2010 styling, basically those items I listed in the above link (rims, side sill, silver mesh, clear taillights)? What about any potential to sell the 07 old parts after upgrading, perhaps reduce the cost a little?

 

I have the side sills. Cost was $2300 painted and installed. The clear tails are $1,800. I am not sold on them for my Onyx Black '07.

Not sure what you mean by silver mesh.

 

Can you post pics of the side sills?

 

I have all of the RSC mods (ECU, 200 cats, RSC exhaust) and the AM N400 air intake kit, on my '07 sport shift (I will remap the trani ECU with RSC this year).

I made the mods in 2 stages; and can feel definite incremental improvements in horsepower. First did the N400 factory hp kit upgrade, followed 6 months later with the RSC power upgrades.

I too believe it would be VERY helpful for RSC to post performance dyno (before and after) results for the 4.3 upgrades. There seem to be many 4.3 owners interested in the improvements, but we truly do not know what results that we are or will achieve.

I can say that by "seat of the pants" comparo; I am very please with the improvements. My 4.3 sounds fantastic (thanks to Herschel's great assistance at RSC).
And the acceleration is definitely improved. I too, would like to know if I have more power than the 4.7.

Stuart and Herschel: can you help us with this? I think it would be a great selling point for your product offerings?

thanks, Jeff

 

The numbers from Road and Track confirm the feeling I had when driving the 4.7. The untouched 4.3 is 0-60 in 5.3 sec and 1/4 mile 13.7 sec at 104.4 mph. The 4.7 convertible is 0-60 in 4.5 sec and 1/4 mile 12.8 sec at 113.3 mph. Road and Track test car had paddle shifters. See Road and Track April 2010, (MB SL 63 vs. V8 4.7 Vantage Convertible). 4.7 coupe is lighter and probably faster. I have an 07 Vantage and drive it frequently. I could simply tell the difference. Now sound is subjective; to me the 4.7 sounded deeper.

 

Thanks! I heard the taillighters were about that, and in my opinion, look execellent on Onyx Black. Here is an example: https://www.6speedonline.com/forums/...-ive-seen.html

The side sills at $2300 seems pretty pricy, ouch.

With respect to the "silver wire mesh" I am referring to the cuts in the upper hood and right above the front tires that are filled with a crate/mesh looking material. In the 06-10 models, they are just black color inside, but on 2010, they are bright silver and it looks really good. You can see them pretty clearly in the photos in the link above too. It may be possible to simply paint what you have, hopefully be the cheapest mod.

I'm guessing those rims are going to set you back $4k-$5k after labor. I think they are only available on Vantages with sportpack too.

So $2300 + $1800 + ~$4500 (rims) + ~$450 (silver mesh) = $9,050 just for visual upgrades. Ouch.