Post your dyno curve here

[ClassiChimi]

I'll check out what's involved when I see Dom tomorrow,,,I've just been for a good drive,,I don't really need anymore power,,
I'm actually very happy with the car and if I could get rid of the shunting at 800 revs I'll be well chuffed

[QBee]

At what speed and in what gear are you driving at 800 rpm?
Shirley you aren't trying to do 20mph in 5th?
It's not a diesel automatic, you know.......

[ClassiChimi]

Hi Anthony, the tick overs set to 780 and it runs like that from stone cold without any drama,, it's bonkers,,,
I have the smallest shunting at 1200 to 1500 revs that does effect the car at about 40 mph in 4th,, it's hardly noticeable but it is there,, as a package I'm over the moon with my current set up so with this final tweak to the map I'll be leaving it well alone for sometime,,,
I should pop up to yours and you should have a drive,, you know these cars when driving them hard, I'd really like your opinion of it,

[macdeb]

ChimpOnGas said:

Personally I think it would be better for us all to move on from the crank/flywheel figures and just quote the wheel/hub figure, of course that opens up a whole new "what rolling road did it make that figure on" argument. But just quoting the wheel/hub figure would at least eliminate the drive train loss percentage argument once and for all...

Of course doing things this way would ultimately mean people would need to quote a lower figure, so I can easily see how my suggestion might not be a very popular one...

OK, 500 at the wheels here

Edited by macdeb on Tuesday 8th December 20:19

[macdeb]

N7GTX said:

It was finally mapped after running in 3,000 miles just after the Chatsworth meeting (Mac gave me a right bollicking so got it done straight away).

worth it though eh mate

[macdeb]

N7GTX said:

(I'll bet Mac is watching this thread :yes

Edited by N7GTX on Tuesday 8th December 08:39

[SILICONEKID345HP]

ClassiChimi said:

Hi Anthony, the tick overs set to 780 and it runs like that from stone cold without any drama,, it's bonkers,,,
I have the smallest shunting at 1200 to 1500 revs that does effect the car at about 40 mph in 4th,, it's hardly noticeable but it is there,, as a package I'm over the moon with my current set up so with this final tweak to the map I'll be leaving it well alone for sometime,,,
I should pop up to yours and you should have a drive,, you know these cars when driving them hard, I'd really like your opinion of it,

,

Mine sits at the same rpm from cold starts at 12.5 afr and has it warms up it idles at 14.7 nicely.

You may need a little more fuel when your car is shunting..Remember the plenum induction setup was not designed for these cams just for slogging 4 wheel dives..

Why not get an AFR gauge..

[N7GTX]

macdeb said:

N7GTX said:

It was finally mapped after running in 3,000 miles just after the Chatsworth meeting (Mac gave me a right bollicking so got it done straight away).

worth it though eh mate

You're scary. Dom st himself when I told him

Oh yes, all that waiting was worth it.

[ChimpOnGas]

macdeb said:

ChimpOnGas said:

Personally I think it would be better for us all to move on from the crank/flywheel figures and just quote the wheel/hub figure, of course that opens up a whole new "what rolling road did it make that figure on" argument. But just quoting the wheel/hub figure would at least eliminate the drive train loss percentage argument once and for all...

Of course doing things this way would ultimately mean people would need to quote a lower figure, so I can easily see how my suggestion might not be a very popular one...

OK, 500 at the wheels here

Edited by macdeb on Tuesday 8th December 20:19

Sounds about right.

500 wheel horsepower seems a perfectly reasonable and manageable round figure, and a good target for us all

I make that 590hp at the crank using the 18% drive train loss rule!

[Richard 858]

ChimpOnGas said:

Sounds about right.

500 wheel horsepower seems a perfectly reasonable and manageable round figure, and a good target for us all

I make that 590hp at the crank using the 18% drive train loss rule!

I feel like such a failure now, I only got to 468 at the wheels......and to cap it all backed off to 443 (to be on the safe side on a rebuilt, warrantied motor)

[phazed]

I can't believe how 500, (or 433) at the wheels feels like.

My car feels rocketship fast as it is!

[Richard 858]

phazed said:

I can't believe how 500, (or 433) at the wheels feels like.

My car feels rocketship fast as it is!

See you on a track day in the new year then Peter?

[phazed]

Richard 858 said:

phazed said:

I can't believe how 500, (or 433) at the wheels feels like.

My car feels rocketship fast as it is!

See you on a track day in the new year then Peter?

Defo.

[ChimpOnGas]

Richard 858 said:

ChimpOnGas said:

Sounds about right.

500 wheel horsepower seems a perfectly reasonable and manageable round figure, and a good target for us all

I make that 590hp at the crank using the 18% drive train loss rule!

I feel like such a failure now, I only got to 468 at the wheels......and to cap it all backed off to 443 (to be on the safe side on a rebuilt, warrantied motor)

Imagine how I feel with just 250 ponies at the crank!

I've already signed up for a flower arranging evening course and started watching musicals

[QBee]

Come on a track day, Dave - you'd be surprised how little difference BHP makes.

[MPoxon]

ClassiChimi said:

I'll check out what's involved when I see Dom tomorrow,,,I've just been for a good drive,,I don't really need anymore power,,
I'm actually very happy with the car and if I could get rid of the shunting at 800 revs I'll be well chuffed

Exactly right, it has been off the road for long enough and you now have a really nice sorted TVR.

You don't want to take it off the road again pile in more cash just so you can wave your willy around at some bigger numbers. Just bloody drive the thing and enjoy it. We shall expect to see you at some trackdays next year as well sir.

[ClassiChimi]

If Dave agrees to do a trackday then so will I Mat,, lol
Ok just been over to Doms,, tweaked the map,,,no shunting from as low as 800 revs,, 4th gear 25 mph onwards and nothing,,,Fantastic,,,
AFR meter,, yes Daz I should have one fitted

Asked Dom what a turbo would do on my engine,,,450bhp,,,550ft lbs torque all day long,,,I just laughed my freaking head off,,,
Everything's in place,,I just need to save another few grand it's just good to know,,,,

Matt, never a truer word said,,

[Richard 858]

ChimpOnGas said:

Imagine how I feel with just 250 ponies at the crank!

I've already signed up for a flower arranging evening course and started watching musicals

[BeastMaster]

BeastMaster said:

QBee said:

Hi Andy
What model of TVR is it?
What engine size is it
What engine mods does it have?
Why do you think the graph is at the wheels?
Can you post the graphs for us to review please?

Hi Anthony - Will try and get the Graph posted. It came out of the Factory in 94 as a 4.0BV pre serp, according to the extensive documentation which came with the car the original owner Stuart Cosgrove was very disgruntled with the performance having it go back several times. In the end he had a company called A1 Fuel Services in Leigh, Lancashire rebuild it as a 5.0L along with brake and exhaust modification. According to the invoice it looks like most of the parts came from Powers but the camshaft spec just reads 5.0 spec cam. On the road it feels very rapid, while at Neil Gardeners for a repair a few years ago it was commented that if was quick and asked what cam it was running.

Thanks Andy

Hiya - been a while as scanner has not been working, but now have a new camera so able to post the graph

This was from TVR Powers Dyno about 8 years ago, and was taken when trying to find a fault with a slight misfire, later found it to be the ignition amp playing up when hot. Also at the time the rear tyres were quite old and hard so was experiencing some slip.

Reason for posting is to understand the at flywheel figures, which information from here tells me to add around 18% to get BHP at wheels figure, but does this also apply to the Torque numbers, add 18% which would bring me into line with a typical 500.

As can be seen the Torque graph is also very different to those on here and wondered if this could be explained.

Many thanks Andy

[QBee]

Yes, around 280 bhp and 320-330 lbs ft of torque at the fly, across a very wide rev range.
Classic 5 litre, makes the car really pull from low revs. Fantastic drive on track, where your speed is only limited by the length of the straights...... Mine is similar, and except for hairpin bends I don't need to go below third gear on a track day.