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jcpgasoline
Original Poster
210 posts
83 months
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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. 
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Getsis
1,315 posts
85 months
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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 
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jcpgasoline
Original Poster
210 posts
83 months
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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 More power and torque to come from mapping and bigger headers, or so I understand...
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Getsis
1,315 posts
85 months
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Bigger headers will make a difference but now it's getting to be a very expensive upgrade.
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rvT350
26 posts
23 months
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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
26 posts
23 months
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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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Templedog
157 posts
38 months
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These figures are at the wheels I believe
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slimtater
525 posts
39 months
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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!!
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Mattt
14,802 posts
87 months
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Could the dyno not take over 400bhp then? Looks 'restricted' at the top end.
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astonman
278 posts
79 months
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ITS THE 400BHP at 5500rpm!!!!!!!!!!!!!!!!!!!!!!!! This is 100bhp more thn the 4 litre at the same revs.
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RedSpike66
1,973 posts
81 months
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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...
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dvs_dave
3,574 posts
94 months
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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.
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MonteV
290 posts
129 months
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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.
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Tvr Power
866 posts
75 months
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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
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Laser Sag
1,045 posts
112 months
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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.
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7 TVR
1,915 posts
37 months
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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!
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natben
2,121 posts
100 months
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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!!
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MonteV
290 posts
129 months
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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!
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PascalBuyens
2,561 posts
151 months
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So Dom, where you're at now? You promised me a go in it, you owe me one 
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Tvr Power
866 posts
75 months
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PascalBuyens said: So Dom, where you're at now? You promised me a go in it, you owe me one Pascal my little gay friend your more than welcome to have a test drive my Sag done 2500 miles in the UK with no issues  , just awaiting a window opportunity to hop on the ferry and test in Europe... Dom
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