TVR Power 5.0l Upgrade

[wixer]

Anyone out there had the TVR Power 5.0l upgrade conversion done to their car ?? Am thinking about getting mine done sometime in the future, so I'd be interested to know what peoples views are.

[joospeed]

I think a std 4.6 litre bottom end works out best for torque/pound value .. Peter H discounted the 5 litre in favour of the 4.6 I think so best wait for him to post, he'll have some useful info for you.

[Moto]

Wixer,

I'm planning the same upgrade, once the end of the summer is here and I can bear to have the car off the road. I'd also be interested to hear from anyone who's had this done already and what results they've had.

[gerjo]

I thought the upgrade from Power to be quite expensive. Instead I went for the twin plenum, large airflow and P404 cam option + M Adams chip (this is basicly what Power does too).

Less expensive (although it isn't cheap) but it really moves now!

[IPAddis]

TVR Power were doing an upgrade pack for a 5 litre which involved removing the inlet trumpets all together. Most tuners think this is bonkers. Make your own conclusions.

Ian A.

[HarryW]

IPAddis said:

TVR Power were doing an upgrade pack for a 5 litre which involved removing the inlet trumpets all together. Most tuners think this is bonkers. Make your own conclusions. Ian A.

Got to be better than the lumps of metal (straight exhaust pipe sections I believe) that are currently in most 500's plenums, more of an hinderence than a trumpet, IMHO.

Harry

[boosted ls1]

IPAddis said:

TVR Power were doing an upgrade pack for a 5 litre which involved removing the inlet trumpets all together. Most tuners think this is bonkers. Make your own conclusions. Ian A.

Bet it's been about costs. Trumpets cost a packet or take ages to make so it wouldn't have been viable for them. Tim could provide some enlightenment on this.

I've made a new cast alloy 24v plenum for limited use and the trumpets have been the most labour intensive part this far!

[RichB]

What you mean like these

Before and after Tim's conversion work! Rich...

[IPAddis]

HarryW said:

Got to be better than the lumps of metal (straight exhaust pipe sections I believe) that are currently in most 500's plenums, more of an hinderence than a trumpet, IMHO. Harry

I thought the reason for having the middle trumpets longer than the outside ones is because the air has further to travel from the throttle to the outside trumpets. Thus if you remove all the trumpets completely, lose this difference in length and your outside cylinders have a different fuel/air mix from the inside cylinders, especially as the fuelling / closed loop lambda control on these is per bank not per cylinder.

I can't see it being a cost reason, the trumpets aren't that expensive compared to the rest of the upgrade. Besides, if trumpets are expensive and unnecessary, why was the engine ever designed to have them? Why does anyone buy Tim's carbon ones, just remove the existing ones and do quick bit of sandpapering.

Very odd if you ask me, maybe Tim or one of the lurking engine builders can comment.

Ian A.

[GreenV8S]

IPAddis said:

I thought the reason for having the middle trumpets longer than the outside ones is because the air has further to travel from the throttle to the outside trumpets. Thus if you remove all the trumpets completely, lose this difference in length and your outside cylinders have a different fuel/air mix from the inside cylinders

The important distance is from the inlet valve to the top of the trumpet - the inner cylinders have shorter runners so need longer trumpets to keep the overall induction lengths equal.

BTW that picture showing plain tubes in the trumpet base surely can't be typical? That's just plain WRONG.

[2 sheds]

TVR trumpet bases have enlarged completely vertical ports to take the their steel tubes, once this has been done its impossible to fit alloy trumpets as the ports then need to angle out slightly, so for them to fit trumpets would require a whole new base.
If no trumpets are used there will be a reduction in low-mid range torque but they will still achieve max bhp.
Tim

[swissgriff500]

Tim - unless I totally misunderstood your comments - how then did you manage to fit your alloy trumpets (above pictures) to Richard’s car without fitting the new base (or did you fit the new base)?
Cheers, Ozren

[2 sheds]

swissgriff500 said:

Tim - unless I totally misunderstood your comments - how then did you manage to fit your alloy trumpets (above pictures) to Richard’s car without fitting the new base (or did you fit the new base)? Cheers, Ozren

New base.
Tim

[RichB]

GreenV8S said:

BTW that picture showing plain tubes in the trumpet base surely can't be typical? That's just plain WRONG.

What those plain tubes sticking up oiut of my cylinder head Pete? I assure you that's what was there but not any longer Rich...

[HarryW]

RichB said:

GreenV8S said: BTW that picture showing plain tubes in the trumpet base surely can't be typical? That's just plain WRONG. What those plain tubes sticking up oiut of my cylinder head Pete? I assure you that's what was there but not any longer Rich...

As I said earlier the standard 5ltr seems to have pieces of exhaust pipe stuff in as the trumpets . With no taper these seriously restrict the air flow by creating a dynamic restriction, even ones that are tapered/flared and have no roll on the outside of the taper also restrict it, hence the nice ones Tim does seem to work in theory and practice .

Rich what size trumpets are they btw, they seem awfully large to moi, but nice and shinny tho, shinny is good .

Harry

[RichB]

HarryW said:

Rich what size trumpets are they btw, they seem awfully large to moi, but nice and shinny tho, shinny is good Harry

Don't know what size they are, maybe Tim does? R...

[2 sheds]

Don't worry Harry yours and RichB's are the same size
45mm for thoughs who need to know.
Tim

[wixer]

Thanks for the enlightenment on trumpets but no-one really answered my original question. Isn't there anyone out there who's had the TVR Power conversion done ??

Moto, sounds like you'll get yours done before me (if you haven't been put off by all this trumpet talk), so I'd be interested to hear from you when you have.

[joospeed]

Not sure I understand what you're asking .. surely you can drive any 5 litre chim or griff and sample the TVR Power 5 litre conversion? .. it's what TVR fit as std to every 5 litre car since TVR Power is a subsidiary of TVR Engineering ltd?? or do they do an upgraded version of that same engine with more power, is that what you're asking?

[shpub]

If it is the 5 litre conversion don't forget that the 500s had uprated brakes and suspension compared to the 4.x cars so factor that in. Insurance companies do not like engine upgrades on their own. They like cars that stop .