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jcpgasoline

Original Poster:

268 posts

99 months

[news] 
Thursday 19th April 2012 quote quote all
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

1,429 posts

101 months

[news] 
Thursday 19th April 2012 quote quote all
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:

268 posts

99 months

[news] 
Thursday 19th April 2012 quote quote 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

1,429 posts

101 months

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

rvT350

27 posts

39 months

[news] 
Sunday 29th April 2012 quote quote all
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

39 months

[news] 
Sunday 29th April 2012 quote quote all
I thought the 4.5 had given around 415bhp and 370lbft already?

Expected to see some higher figures tbh

Templedog

167 posts

54 months

[news] 
Sunday 29th April 2012 quote quote all
These figures are at the wheels I believe

slimtater

948 posts

55 months

[news] 
Sunday 29th April 2012 quote quote all
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

15,611 posts

103 months

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

astonman

292 posts

95 months

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

RedSpike66

2,183 posts

97 months

[news] 
Tuesday 8th May 2012 quote quote all
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

3,983 posts

110 months

[news] 
Wednesday 9th May 2012 quote quote all
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

346 posts

145 months

[news] 
Wednesday 16th May 2012 quote quote all
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

933 posts

91 months

[news] 
Wednesday 16th May 2012 quote quote all
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

1,959 posts

128 months

[news] 
Wednesday 16th May 2012 quote quote all
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

2,410 posts

53 months

[news] 
Saturday 19th May 2012 quote quote all
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

2,533 posts

116 months

[news] 
Sunday 20th May 2012 quote quote all
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

346 posts

145 months

[news] 
Wednesday 6th June 2012 quote quote all
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

167 months

[news] 
Monday 18th June 2012 quote quote all
So Dom, where you're at now?

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

Tvr Power

933 posts

91 months

[news] 
Monday 2nd July 2012 quote quote all
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

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