PistonHeads.com Forum

TVR Power 5.0 litre

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jcpgasoline

Original Poster:

272 posts

126 months

Thursday 19th April 2012
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I was up in Coventry collecting my car from TVR Power last night and was fortunate enough to see Dom's Sag with his 5.0 doing some mapping on the rolling road. It sounds fantastic and I saw some pretty impressive numbers before I left.

Anyhow, for those interested, here's the print out comparing the original factory Sag build with the 5.0 litre build, in the same car, on the same dyno, with the same fuel type. Scary stuff and that's just a base map.


Getsis

1,478 posts

128 months

Thursday 19th April 2012
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I just got sent this graph too, looking at the graph It looks more tuned than a base map?, can't see how they can get much more out of it. Still impressive torque/BHP smile

jcpgasoline

Original Poster:

272 posts

126 months

Thursday 19th April 2012
quotequote all
Getsis said:
I just got sent this graph too, looking at the graph It looks more tuned than a base map?, can't see how they can get much more out of it. Still impressive torque/BHP smile
More power and torque to come from mapping and bigger headers, or so I understand...

Getsis

1,478 posts

128 months

Thursday 19th April 2012
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Bigger headers will make a difference smile but now it's getting to be a very expensive upgrade.

rvT350

27 posts

66 months

Sunday 29th April 2012
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I thought the 4.5 had given around 415bhp and 370lbft already?

Expected to see some higher figures tbh
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rvT350

27 posts

66 months

Sunday 29th April 2012
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I thought the 4.5 had given around 415bhp and 370lbft already?

Expected to see some higher figures tbh

Templedog

169 posts

81 months

Sunday 29th April 2012
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These figures are at the wheels I believe

slimtater

1,012 posts

82 months

Sunday 29th April 2012
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rvT350 said:
I thought the 4.5 had given around 415bhp and 370lbft already?

Expected to see some higher figures tbh
Forget the BHP - look at that torque!!

Mattt

16,154 posts

130 months

Thursday 3rd May 2012
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Could the dyno not take over 400bhp then? Looks 'restricted' at the top end.

astonman

310 posts

122 months

Monday 7th May 2012
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ITS THE 400BHP at 5500rpm!!!!!!!!!!!!!!!!!!!!!!!! This is 100bhp more thn the 4 litre at the same revs.

RedSpike66

2,206 posts

124 months

Tuesday 8th May 2012
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And the 320lbs/ft from 1500rpm instead of having to wait until 4000 rpm !!
Still, its 25% bigger engine, so would expect 25% increases I suppose...

dvs_dave

4,756 posts

137 months

Wednesday 9th May 2012
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Some impressive numbers lower down the rev range, however it seems to have run out of steam by 5.5k? This to me indicates that the head has reached it's maximum flow rate and the ports are choked. Some head work would be needed to keep the top end numbers up.

MonteV

355 posts

172 months

Wednesday 16th May 2012
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The 4.5 compared to the standard 4.0 gained a 22.7% in hp and 29% in torque on a 12.5% volume increase.

The 5.0 compared to the 4.5 gained a 3.6% in hp, and 11.6% in torque on a 11.1% volume increase.

Clearly diminishing returns. I agree it is likely the engine's breathing is limiting at least the hp. To take advantage of the increased capacity more air molecules need to be compressed into the engine than it can breathe for itself.

I guess that is why Dom has been talking about turbocharging, although I would prefer supercharging to maintain the main reason for my wanting a straight six in the first place, it's sound.

Tvr Power

1,035 posts

118 months

Wednesday 16th May 2012
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MonteV said:
The 4.5 compared to the standard 4.0 gained a 22.7% in hp and 29% in torque on a 12.5% volume increase.

The 5.0 compared to the 4.5 gained a 3.6% in hp, and 11.6% in torque on a 11.1% volume increase.

Clearly diminishing returns. I agree it is likely the engine's breathing is limiting at least the hp. To take advantage of the increased capacity more air molecules need to be compressed into the engine than it can breathe for itself.

I guess that is why Dom has been talking about turbocharging, although I would prefer supercharging to maintain the main reason for my wanting a straight six in the first place, it's sound.
Aspirated power is all im interested at the moment, yes you’re all correct my 5 ltr not making huge numbers why? Simple answer "start safe" then lean on the old girl, at the moment im only running 11:0:1 compression with a Very safe squish, Standard road cams and valve springs, my whole objective is 100% reliability

So you all ask what’s the next level will be:
Larger Exhaust Valves, better cams with a little more compression, larger intake butterflies and much better exhaust manifolds with the all new Smart MBE ecu.


Dom

Laser Sag

2,747 posts

155 months

Wednesday 16th May 2012
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Dom sensible approach given that you warrant your engines the way you do and good to see you have decided to post again.

7 TVR

2,552 posts

80 months

Saturday 19th May 2012
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rvT350 said:
I thought the 4.5 had given around 415bhp and 370lbft already?

Expected to see some higher figures tbh
A massive +1
But understand the approach!

natben

2,571 posts

143 months

Sunday 20th May 2012
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Laser Sag said:
Dom sensible approach given that you warrant your engines the way you do and good to see you have decided to post again.
Yes a sensible approach from Dom as this forum is littered with people who have been used as test mules for engine upgrades and conversions that have cost fortunes for very little or NO return!!

MonteV

355 posts

172 months

Wednesday 6th June 2012
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Tvr Power said:
Aspirated power is all im interested at the moment, yes you’re all correct my 5 ltr not making huge numbers why? Simple answer "start safe" then lean on the old girl, at the moment im only running 11:0:1 compression with a Very safe squish, Standard road cams and valve springs, my whole objective is 100% reliability

So you all ask what’s the next level will be:
Larger Exhaust Valves, better cams with a little more compression, larger intake butterflies and much better exhaust manifolds with the all new Smart MBE ecu.


Dom
Thanks for the reply. I like your plans and will be most interested to follow the results!

PascalBuyens

2,868 posts

194 months

Monday 18th June 2012
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So Dom, where you're at now?

You promised me a go in it, you owe me one tongue out

Tvr Power

1,035 posts

118 months

Monday 2nd July 2012
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PascalBuyens said:
So Dom, where you're at now?

You promised me a go in it, you owe me one tongue out
Pascal my little gay friend your more than welcome to have a test drive my Sag smile done 2500 miles in the UK with no issues smokin , just awaiting a window opportunity to hop on the ferry and test in Europe...


Dom