Post your dyno curve here

[spitfire4v8]

just seen the date on this, almost exactly 10 years ago that it was on the dyno!!

[drlloyd]

A few engine bay shots of our TVR Chimaera 400 - naturally aspirated 4.1-litre Rover V8 with 373 bhp and 315 lb-ft at the flywheel!

[drlloyd]

[drlloyd]

Crazy thing is, we think that we will be able to get even more power with a different camshaft! The Kent M238 was just chosen as a ball-park camshaft to eliminate another variable during testing but the LCA (lobe centre angle) is not optimum for this particular engine specification. We are also looking into using hi-rev hydraulic followers for some applications but this may limit the maximum engine speed.

[Classic Chim]

Heads heads and more heads,,,,
So with the extra revs you stay in the hp window with each gear upshift rather than falling below and into the torque curve which is still pretty impressive.
Has this got a standard bottom end and pistons etc.
Why have you opted to run air intake to the o/s,,,, too much flow ! That engines all about flow by the looks of it. Cracking.
So you better book up for Derek’s timed 1/4 miles sessions,,, it’s the only true barometer

That’s going to be fast that’s for sure

[drlloyd]

The cylinder heads are the main restriction on the Rover V8. A few years ago we tested a wide range of different heads (standard, modified & aftermarket) and the Wildcat heads flowed the most by a significant margin. By chance ACR are now productionising the new generation of Wildcat heads, so we are now working with them to develop a complete package including intake, exhaust, etc - and what better car to develop it on than a TVR Chimaera?

Definitely up for the UTVRS4 in August but have I never been on the drag strip so will need tips and practice! :-)

Edited by drlloyd on Friday 1st June 22:22

[SILICONEKID 345HP 12.03]

Will these new heads bolt straight to a standard engine or it for to be a full rebuild and bespoke parts to make it work ?

[SILICONEKID 345HP 12.03]

SILICONEKID 345HP 12.03 said:

Will these new heads bolt straight to a standard engine or solicit need to be a full rebuild with bespoke parts to make it work ?

[drlloyd]

It will all bolt straight onto any Rover V8 that is 3.9 litres or larger. Naturally each short engine will physically have its own maximum speed depending on if it's cross-bolted, bearing size, stroke, etc.

[SILICONEKID 345HP 12.03]

What makes you want to develop the old Rover v8 when you can buy a crate ls engine with unlimited power and s choice of gear boxes with a few brackets and new exhaust manifolds ?

You must feel very nostalgic and just want to keep the old girl going .

[Classic Chim]

drlloyd said:

The cylinder heads are the main restriction on the Rover V8. A few years ago we tested a wide range of different heads (standard, modified & aftermarket) and the Wildcat heads flowed the most by a significant margin. By chance ACR are now productionising the new generation of Wildcat heads, so we are now working with them to develop a complete package including intake, exhaust, etc - and what better car to develop it on than a TVR Chimaera?

Definitely up for the UTVRS4 in August but have I never been on the drag strip so will need tips and practice! :-)

Edited by drlloyd on Friday 1st June 22:22

Respect sir... Derek can help you with the starts, he got me down from 2.1 to 1.8 or 60 ft or was that his tyres

I thought it was going to be a piece of cake but just looking up the track at wet looking tarmac is enough to put you off. Then there’s the crowds,,, of Tvr mates willing you on,,, I think

Great fun although like any form of hard driving can be tough on the car but you know that already I’m absolitely sure.
Looks great I must say. Not sure what the big end shells might look like after a couple of years of this hyper revvin but who cares if it goes like it surely must do.
Very interesting

[Squirrelofwoe]

drlloyd said:

I need to come and talk to you guys at some point about getting the Canems system fitted to my 400hc- is this Chim likely to be around to have a closer look at? I promise I won't dribble over it too much!

My car has just had a new Taraka 855 cam fitted a few weeks ago, so the plan is to enjoy it as it is for the summer, then get you guys to install the Canems system over the winter.

[DangerousDerek]

drlloyd said:

The cylinder heads are the main restriction on the Rover V8. A few years ago we tested a wide range of different heads (standard, modified & aftermarket) and the Wildcat heads flowed the most by a significant margin. By chance ACR are now productionising the new generation of Wildcat heads, so we are now working with them to develop a complete package including intake, exhaust, etc - and what better car to develop it on than a TVR Chimaera?

Definitely up for the UTVRS4 in August but have I never been on the drag strip so will need tips and practice! :-)

Edited by drlloyd on Friday 1st June 22:22

Don't worry about the dragstrip thing, just consider it as a spirited start from the traffic lights an your first couple of runs. Then you can relax and fine tune your launch. Be great to see you guys there.

[drlloyd]

SILICONEKID 345HP 12.03 said:

What makes you want to develop the old Rover v8 when you can buy a crate ls engine with unlimited power and s choice of gear boxes with a few brackets and new exhaust manifolds ?

You must feel very nostalgic and just want to keep the old girl going .

An LS conversion costs about £25K and with the compact engine bay arguably the power potential is not unlimited. We've seen 480bhp crate engines in TVRs that struggle to put out 430bhp due to the lack of space for suitably free-flowing exhaust manifolds.
With the larger capacity Rover V8s combined with the Wildcat heads this level of horsepower should be easily achievable and give a power delivery more suited to a lightweight sports car.

... and yes we do love the Rover V8.

[drlloyd]

Squirrelofwoe said:

I need to come and talk to you guys at some point about getting the Canems system fitted to my 400hc- is this Chim likely to be around to have a closer look at? I promise I won't dribble over it too much!

My car has just had a new Taraka 855 cam fitted a few weeks ago, so the plan is to enjoy it as it is for the summer, then get you guys to install the Canems system over the winter.

Of course you would be welcome to view in person, as this is my own car it will not be going anywhere else.

[drlloyd]

DangerousDerek said:

drlloyd said:

The cylinder heads are the main restriction on the Rover V8. A few years ago we tested a wide range of different heads (standard, modified & aftermarket) and the Wildcat heads flowed the most by a significant margin. By chance ACR are now productionising the new generation of Wildcat heads, so we are now working with them to develop a complete package including intake, exhaust, etc - and what better car to develop it on than a TVR Chimaera?

Definitely up for the UTVRS4 in August but have I never been on the drag strip so will need tips and practice! :-)

Edited by drlloyd on Friday 1st June 22:22

Don't worry about the dragstrip thing, just consider it as a spirited start from the traffic lights an your first couple of runs. Then you can relax and fine tune your launch. Be great to see you guys there.

Thank you. Looking at the various drag strip results it looks as though it is all timed in stages too? So should be able to see the true pace of the car, even if my reaction times are poor!

[DangerousDerek]

drlloyd said:

Thank you. Looking at the various drag strip results it looks as though it is all timed in stages too? So should be able to see the true pace of the car, even if my reaction times are poor!

yep, Reaction times are only important when trying to beat the guy in the other lane. Your ET isn't affected as your time only starts when you set of and break the timing beam. ETs don't mean much when assessing the grunt. Its all about terminal speed.
Most V8's will top 100, a good 450 or 500 will approach 110. Those that have modified successfully can see 115ish.

[Classic Chim]

drlloyd said:

Thank you. Looking at the various drag strip results it looks as though it is all timed in stages too? So should be able to see the true pace of the car, even if my reaction times are poor!

Exactly. You can even be careful off the line then calculate what you might have done with an aggressive race start.

There’s so much mis information about Dyno figures I take them with a pinch of salt until I’ve seen the car record an actual time.
What I’ve been really happy with is my car that’s supposed to be less than 300 hp going by Dom’s Dyno but is only 1/2 sec slower than cars with 50 hp more,,, it’s probably nearer 8/10ths slower but I’m a mean racer joking

My car has good torque so I used that to get me away and ahead, Derek’s spot on about speeds and I regularly hit around 109-110 mph terminal speed. I/4 of a mile,,, it’s still darn fast I reckon Hit forth and the car feels like it stops compared to cars with the extra hp, overall the times reflect the Dyno numbers very well and the cars do as you’d expect. 1/2 sec as we know is a long way off in reality.
So with the power your getting that terminal speed would be hugely interesting reading.

If you study two cars times you can clearly see where one is faster than another. There’s no hiding place. Tells you an aweful lot I reckon.

Derek’s also correct in saying reaction times make no difference to your actual time,,, but for me who once understood the speed of thought required to race,,, my proudest moment was getting off the line in 0.4 Seconds. Made me think I might still have it
Botas race start that everyone deemed a false start was recorded as 0.2 seconds as a reaction time.
So it’s a lot of fun with a lot of info you can dissect later. And with the beer and fire by Derek’s van a ball of the evening talking of your nearly times

[SILICONEKID 345HP 12.03]

drlloyd said:

SILICONEKID 345HP 12.03 said:

What makes you want to develop the old Rover v8 when you can buy a crate ls engine with unlimited power and s choice of gear boxes with a few brackets and new exhaust manifolds ?

You must feel very nostalgic and just want to keep the old girl going .

An LS conversion costs about £25K and with the compact engine bay arguably the power potential is not unlimited. We've seen 480bhp crate engines in TVRs that struggle to put out 430bhp due to the lack of space for suitably free-flowing exhaust manifolds.
With the larger capacity Rover V8s combined with the Wildcat heads this level of horsepower should be easily achievable and give a power delivery more suited to a lightweight sports car.

... and yes we do love the Rover V8.

My car makes about 345hp at the fly,it's a v8d 5l with I think stage 4 heads and Stealth cam

What power would it make with the wild cat heads?

What else would need upgraded ?

It's getting exciting ..

Edited by SILICONEKID 345HP 12.03 on Saturday 2nd June 16:52

[QBee]

Obvious first move is to upgrade your trousers to brown ones, Daz.
After that, it depends on what bhp is planned. Over around 400 and you need bigger injectors, better brakes are a good idea too.... much over 400 and you need to look at your fuel pump, a lot over 400 and clutch, gearbox etc start to come into play.
Depends what you want from the car.