The truth,the truth and nothing but the truth..SEAC dyno run

[cantus]

https://www.facebook.com/groups/jebentijmuidenaara...

[adam quantrill]

77% or 74%, so it's about the same percentage loss.

[alphaone]

Thats a really good link, saw lots of pics of my Vixen when it was in Holland.

.. and even saw Wims grantura on the road :-)

[taz turbo]

Oh dear me!

Is this why the bigger V8's seem reluctant to go on the rollers in public?

Chris.

[Jack Valiant]

To be honest I am pleased to see some realistic stock TVR / RV8 dyno numbers....... Especially on the black 420 as stated the other one needs work, the Gredge 500 with its worked Griff HC motor and induction work is doing a realistic 287 BHp and 314 Ft lbs and not the 300 plus quoted figs for the Griff. I will need MS or emerald to get close to the 300 barrier but she is fast enough at the moment

Edited by Jack Valiant on Saturday 5th April 16:10

[Waynester]

I think there's a culture in performance car circles..particularly TVRs for over claiming/embellishing bhp figures. Truer, realistic figures, especially if on the low side, get quietly hidden away. In some ways it's part ego..I think we all want our cars to be kicking out 300bhp at the wheels, but the reality is usually quite different.
And yes, I'm scared to put my car on the rollers, incase she goes ahead, and proves the theory by stomping out a magnificent 110bhp!!

[QBee]

To give you a comparison and make you feel not so inadequate

My Chimaera had a new engine last year.
5 litre RV8, cross bolted and balanced, built by V8 Developments. Stage 3 heads, fully ported, larger plenum, injectors and AFM, lightened flywheel, but still on the Lucas ECU.

I expected 330 bhp at the fly.
I got 300 bhp at the fly.
And 330 lbs ft of torque.

The point being that the claimed numbers per TVR were quite a long way from the truth.....

[pwd95]

My previous, very healthy (new cam, Mark Adams map etc) Chim 430 made 193 at the wheels a few years ago.......

https://www.youtube.com/watch?v=l5qNI-_s5Lo

& my previous Griff 500 made 200 at the wheels but the cam was a little worn.

On the other hand my 450SE made 227 at the wheels...

[wedgemaniac456]

Always thought it was the exhaust manifolds on the wedge that held back bhp figures,compared to the griffs etc.The rv8 heads are the limiting factors for big bhp,though could be wrong

[taz turbo]

pwd95 said:

My previous, very healthy (new cam, Mark Adams map etc) Chim 430 made 193 at the wheels a few years ago.......

& my previous Griff 500 made 200 at the wheels but the cam was a little worn.

On the other hand my 450SE made 227 at the wheels...

Some interesting figures, good to see your wedge was champion!

My RR printout from a couple of years ago, 2.8 V6 ....

[mrzigazaga]

A Dyno is the best way to give an idea of what is happening..Here is Poppy recently filmed on her first Dyno run..Ignore the black smoke as she was over fuelling a little which was turned down a bit...

VIDEO
https://www.youtube.com/watch?v=oGY7I7D2sgI
GRAPH


I was very happy with the result.

Delilah at BBWF2012 made 107bhp which was embarrassing especially as she was 119db.....But i redeemed myself at BBWF2013 even though she wasn't running 100% as the supercharging project was new ground..She made 209bhp with 190ftlbs of torque..

VIDEO
I still chuckle at the tester laughing at the backfiring....
https://www.youtube.com/watch?v=xOqYfktvkvE

[TV8]

I have an 300 extra cc than the 500 and have 326 bhp and 365 lb of torque following a remap by Jools. Not sure what TVR claimed they should have?

[QBee]

TV8 said:

I have an 300 extra cc than the 500 and have 326 bhp and 365 lb of torque following a remap by Jools. Not sure what TVR claimed they should have?

I think they claimed the Griff 500 was good for 320 bhp. Lies, damned lies and TVR statistics.

[anonymous-user]

QBee said:

To give you a comparison and make you feel not so inadequate

My Chimaera had a new engine last year.
5 litre RV8, cross bolted and balanced, built by V8 Developments. Stage 3 heads, fully ported, larger plenum, injectors and AFM, lightened flywheel, but still on the Lucas ECU.

I expected 330 bhp at the fly.
I got 300 bhp at the fly.
And 330 lbs ft of torque.

The point being that the claimed numbers per TVR were quite a long way from the truth.....

Did you get 300 at the fly, or was that a wheel figure translated to fly?

[TV8]

QBee said:

TV8 said:

I have an 300 extra cc than the 500 and have 326 bhp and 365 lb of torque following a remap by Jools. Not sure what TVR claimed they should have?

I think they claimed the Griff 500 was good for 320 bhp. Lies, damned lies and TVR statistics.

But we both know that Chimaeras are faster....;)

[QBee]

TVRMs said:

Did you get 300 at the fly, or was that a wheel figure translated to fly?

The latter, but as translated by the equipment at Surrey Rolling Road.

[Jack Valiant]

TV8 said:

But we both know that Chimaeras are faster....;)

When your are ready fella

[Waynester]

My 420 SEAC has a modified Griffith 500 engine, built by V8 Developments with ACT - 300bhp, 337 Ib/ft torque, 227bhp at wheels.

[Jack Valiant]

Wayne do you know what cam they put into the Griff motor in your SEAC? My Griff HC motor in the Gredge has the Kent 214 and worked heads / valves and probably close to the so called stage 3 prep. What I need to do is have the same guy as Graham (5.3) to do a bespoke map for my car

[Waynester]

I believe it's a Kent 218 Chris.. with enlarged ACT carbon trumpets, enlarged inlet manifold/throttle body, ported heads, ACT carbon plenum.