Part/s & Rust

philw696

Member
Messages
25,122
Get the full spec from a Dealership using your chassis number will list everything from build.
 

rockits

Member
Messages
9,167
Doesn't seem bad to me....just run down all surface rust and treat with metal rust paint like hammerite or similar.

I understood none of the 4.2's to have valved exhausts and only the 4.7 GTS to have them.
 

Gazcw

Member
Messages
7,700
Ok seems like there is a fair bit of confusion and probably deception concerning the exhaust systems on QPs!

The Maserati line is that if yiur car is a 4.7s or higher, GT S, MC etc then there an exhaust control system will be installed from factory!

However, over at Maserati life this was discussed in depth and the view is not agreed on but looks like ONLY 4.7 cars with oval pipes can control the exhaust via Sport button! There appears to be a lot of disagreement with owners of quad piped cars and even oval piped ones too.

As a default position though Maserati say 4.7 cars from factory are capable of controlling exhaust valves. Therefore if this is not the case, the owners may have switched a system which I doubt or original buyers have been duped! Is there anyway to view a build checklist on these cars or some sort of manufacturing inventory?
If it had of had valves there would be vacuum pipe from the engine bay, the vacuum tank would be a different shape and there would be a solenoid located centrally at the back (48). As in the image Catman sent.
Here is the QP S without vac valves and internal springloaded versions:
https://www.eurospares.co.uk/parts/...o/cooling-heating/additional-air-system-47341

If you want noise, get Jarens to modify at a very good price. If you want to switch on and off then you will need GTS boxes or Larini, vac hose, solenoid, t pieces and a method to switch the valves. A good £1.6k plus labour if buying new Larini I guess unless you get lucky on fleabay.
 

ChrisQP09

Member
Messages
2,994
If it had of had valves there would be vacuum pipe from the engine bay, the vacuum tank would be a different shape and there would be a solenoid located centrally at the back (48). As in the image Catman sent.
Here is the QP S without vac valves and internal springloaded versions:
https://www.eurospares.co.uk/parts/...o/cooling-heating/additional-air-system-47341

If you want noise, get Jarens to modify at a very good price. If you want to switch on and off then you will need GTS boxes or Larini, vac hose, solenoid, t pieces and a method to switch the valves. A good £1.6k plus labour if buying new Larini I guess unless you get lucky on fleabay.

Ive taken this up with HR Owen to establish the full spec of the build. Very very unusual how there is no hard and fast spec for different models. As I have said before, there appears to be a miss match of parts across the range, lacking consistency of any form.
 

ChrisQP09

Member
Messages
2,994
And you're surprised ! Italians built it :D

I do get the funny side of it however I wanted a 4.7 for the extra noise, deeper sound! I feel like Maserati has mis-sold these as I appear not to be the only one with a 4.2 sounding 4.7!
 

Scaf

Member
Messages
6,512
Did you buy privately or though a dealer and did the seller tel you the cat you are buying had valves, if so take it up with them, although on reflection checking before buying might have saved the disappointment you are now feeling.
 

ChrisQP09

Member
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2,994
Did you buy privately or though a dealer and did the seller tel you the cat you are buying had valves, if so take it up with them, although on reflection checking before buying might have saved the disappointment you are now feeling.

I bought privately and took the official word of Maserati as gospel, so did not ask the seller anything regards to the valves! They confirmed all 4.7 models and exhaust valves fitted from factory, which I now know is not the case.
 

Wagons-Lits

Member
Messages
250
I bought privately and took the official word of Maserati as gospel, so did not ask the seller anything regards to the valves! They confirmed all 4.7 models and exhaust valves fitted from factory, which I now know is not the case.

It may be possible that the 4.7s models have valves in their exhaust systems, but Maserati's own QP literature from the period makes it clear that only the 4.7 Sport GT S has what they refer to as the Racing or Sports Exhaust. This would explain the discrepancy between the sound in S vs Sport GT S cars, and is the reason the Sport GT S kicks out slightly more hp. Hope this is helpful

From the QP brochure:

"QUATTROPORTE S ENGINE - 4.7 LITRES. Under the bonnet of the Quattroporte S is the last word

in the new family of wet sump engines: the new 4.7 litre engine unit delivers a top speed of 280 km/h and acceleration

from 0 to 100 km/h in 5.4 seconds, thanks to the new eight-cylinder 90 degree V8 engine, with displacement of 4,691 cc,

which can generate a power of 430 Hp at 7,000 rpm, and a maximum torque of 490 Nm at 4,750 rpm. Identified by its

red cylinder head covers, the new 4.7 litre engine has been specially developed to optimise the car’s power and make the

Maserati Quattroporte S even more exciting to drive, with the smoothest of rides and breathtaking performance. The technical

features adopted ensure that this engine is exceptionally quiet and reliable, with very low friction levels for reduced

fuel consumption, providing performance in which the qualities shared by all the latest Maserati engines, massive specific

power and rapid rise and fall in rpm, are raised to new heights. Generating 82% of its torque at just 2,500 rpm, the 4.7 litre

V8 engine accelerates impressively even in high gears: this means relaxed driving on long trips, and in general full use of the

engine throughout its operating range.


"QUATTROPORTE SPORT GT S ENGINE - 4.7 LITRES. This version is fitted with the most powerful

engine in the Maserati Quattroporte range. Capable of 440 Hp at 7,000 rpm and a maximum torque of 490 Nm at

4,750 rpm, it raises the car’s performance to unprecedented levels. These figures have been achieved not only by modifying

the engine’s electronic control parameters, but also through in-depth development of the racing exhaust system installed

on this version. The system is controlled by air valves that open in SPORT mode to reduce back-pressure in the exhaust;

this increases the maximum power available, and creates a throaty roar at low engine speeds and full symphonic sound of a

genuine sports car at higher rpm."


SPORT EXHAUST SYSTEM

“Normal” Mode - exhaust valves closed.

In “Normal” mode, the exhaust valves are closed, forcing the exhaust gases to take a longer route; this reduces the energy

level and thus tones down the sound of the engine. “Normal” exhaust system control mode is designed to optimise comfort

inside the car by lowering the level of audible engine noise heard, while also limiting the maximum power available to 430

horsepower.

“Sport” Mode - exhaust valves open.

In “Sport” mode the exhaust valves open to offer the exhaust gases a broad, straight path: in contrast with Normal mode, this

allows all the energy to discharge through the tailpipes without any restriction, enabling delivery of the maximum power of

440 horsepower combined with a truly thrilling deep sports- car roar. “Sport” mode, which the driver activates by pressing

the button provided on the central console, is designed to make full use of the car’s performance potential."
 

ChrisQP09

Member
Messages
2,994
64774

Can anyone advise if the rusty part below/central of the suspension bellow is anything to do with the sub-frame?
Everything I see that isn't normal looking I'm becoming concerned!
 

steve3200

Junior Member
Messages
87
Well the MOT in July give everything the all clear. So sub frame from what you can see is fine?

When you say prepped what do you mean? sorry Im not the most technical when it comes to cars.
when they do an mot they only report the rust that they can actually see, what needs to be done is that the covers/wheel arch liners need to be removed for a proper inspection, i knew of a QP that passed the MOT without problem but actually had a badly corroded front subframe which needed immediate replacement.
 

steve3200

Junior Member
Messages
87
Doesn't seem bad to me....just run down all surface rust and treat with metal rust paint like hammerite or similar.

I understood none of the 4.2's to have valved exhausts and only the 4.7 GTS to have them.
you need to get the subframe inspected properly with all the covers removed
 

Zep

Moderator
Messages
9,110
This is the bit that you need to check. Nearly all of the pics Matt posts with huge holes in are here.
 

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philw696

Member
Messages
25,122
That's the anti roll bar for sure.
Easy enough to remove and get powder coated.
If there was a problem with the sub frame the MOT would have picked it up.
I would still get the underside cleaned and treated.
 

steve3200

Junior Member
Messages
87
That's the anti roll bar for sure.
Easy enough to remove and get powder coated.
If there was a problem with the sub frame the MOT would have picked it up.
I would still get the underside cleaned and treated.
I'm afraid that's not correct, the MOT can quite easily miss a badly corroded subframe as experienced with a previous QP