627 bhp (611.9 corrected) at Emerald

627 bhp (611.9 corrected) at Emerald

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Brummmie

Original Poster:

5,284 posts

220 months

Saturday 3rd November 2018
quotequote all
Took old faithful with a fresh engine rebuild and got some decent results. 627bhp@7000rpm peak, we set the limit at 7500 and it’s still doing over 600bhp, no point in revving it further, it’s doing 175mph in 4th at that.

For the hoot there is a 4.5 Cerbera for comparison

N7GTX

7,823 posts

142 months

Saturday 3rd November 2018
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Well, just to let you know that Dangerous Derek is claiming the fastest TVR on the SD1 Modified section of Facebook...... hehe

RichardD

3,560 posts

244 months

Saturday 3rd November 2018
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That is a classic n/a power figure from the 1990s there biggrin

Are you still running the same cam spec as before (24x / 25x)?

I assume this is with the slightly longer trumpets on the Kinsler too? (which are too tall for to use the air box set up you once had.)

Brummmie

Original Poster:

5,284 posts

220 months

Saturday 3rd November 2018
quotequote all
Hi Richard, lots changed! New pistons/bores, shorter trumpets, 242/251 .629 110lsa Texas speed cam, researched it all to try and get a later higher peak, and the theory worked! 175mph in 4th there.

Brummmie

Original Poster:

5,284 posts

220 months

Saturday 3rd November 2018
quotequote all
N7GTX said:
Well, just to let you know that Dangerous Derek is claiming the fastest TVR on the SD1 Modified section of Facebook...... hehe
I’ll join and p!ss on his chips! smile

Podie

46,630 posts

274 months

Saturday 3rd November 2018
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Oof...

RichardD

3,560 posts

244 months

Saturday 3rd November 2018
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Brummmie said:
Hi Richard, lots changed! New pistons/bores, shorter trumpets, 242/251 .629 110lsa Texas speed cam, researched it all to try and get a later higher peak, and the theory worked! 175mph in 4th there.
All good stuff, especially with another red TVR claiming to be able to be capable of more than 200mph wink

Is that a lower LSA than before then? (Still on standard GM rockers too?)

I'll feed the new graph into CarTest (or you can email it if you still have my addy?), and see how it compares to the previous (which was 580bhp if I remember correctly.)

Brummmie

Original Poster:

5,284 posts

220 months

Saturday 3rd November 2018
quotequote all
Which red TVR is that?
My email was shut down by virgin media so I need your addy again, I can send you a complete graph.

RichardD

3,560 posts

244 months

Saturday 3rd November 2018
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Brummmie said:
Which red TVR is that?
My email was shut down by virgin media so I need your addy again, I can send you a complete graph.
Well this particular red TVR currently has 185 pages discussing it in General TVR Stuff & Gossip hehe

PM sent smile.



Brummmie

Original Poster:

5,284 posts

220 months

Saturday 3rd November 2018
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Pm won’t work, I can’t work out how to change email on my profile, you can do it through here though..

http://www.clbraking.co.uk/

schimg

1,923 posts

252 months

Saturday 10th November 2018
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Brummmie said:
Took old faithful with a fresh engine rebuild and got some decent results. 627bhp@7000rpm peak, we set the limit at 7500 and it’s still doing over 600bhp, no point in revving it further, it’s doing 175mph in 4th at that.

For the hoot there is a 4.5 Cerbera for comparison
Hi Paul,
Was good that you attended the WWM meet last month, car looked and sounded spot on in all fairness,
Hope you achieve the power and performance top speed desired.....
As discussed it wouldn't mind a run down the M-Mile, been in Macdebs 450 turbo and Blacpiepauls LS7 (now LS9) .....Snookeses LS3 ......be good to do in the dry though!

Byker28i

58,831 posts

216 months

Sunday 11th November 2018
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so can we read from that the 4.5 AJP is more powerful.... over 7000 revs biggrin

ephemera

215 posts

158 months

Sunday 11th November 2018
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I am afraid it actually reads you need a 14 cyilinder AJP to beat this LS ;-)

spitfire4v8

3,990 posts

180 months

Sunday 11th November 2018
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From those graphs :

612hp/6.9litres = 89hp/litre

370hp/4.5litre = 82hp/litre

and I don't think anyone would argue that the cerbera head work is, erm, somewhat agricultural so I don't think the AJP is doing too bad.

If it was a 6.9 ajp it would be making near enough 570hp smile OK so that's a straight scaling up from the capacity, and you never get a proportional gain from just upping the CCs, but (hypotheticaly) if you did it on a bigger bore, moved the valve centres etc etc it's not unbelievable that the ajp would win outright ...

or look at it another way .. scaling the capacity down , a 4.5litre LS would be making just 400hp* smile


again, taking big liberties with the maths / airflow / rpm

Olivera

7,068 posts

238 months

Sunday 11th November 2018
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Incredible power, but that bonnet bulge has destroyed the Cerb's good looks.

FarmyardPants

4,099 posts

217 months

Sunday 11th November 2018
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spitfire4v8 said:
From those graphs :

612hp/6.9litres = 89hp/litre

370hp/4.5litre = 82hp/litre
That’s a bit unfair on the AJP, the 6.9 has been mapped. My mapped 4.5 made 420.3hp (the only other mod being the SP exhaust)

Edit: thanks to your mapping skills smile



spitfire4v8

3,990 posts

180 months

Monday 12th November 2018
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FarmyardPants said:
spitfire4v8 said:
From those graphs :

612hp/6.9litres = 89hp/litre

370hp/4.5litre = 82hp/litre
That’s a bit unfair on the AJP, the 6.9 has been mapped. My mapped 4.5 made 420.3hp (the only other mod being the SP exhaust)

Edit: thanks to your mapping skills smile
Hi smile I was assuming the cerbera had also been mapped seeing as its emerald rollers and they don't really go in for shootout days or random power runs, so assume it was a car that was in for mapping. If it was std it's a strong cerbera.
My post was a bit tongue in cheek anyway .. the engine builders will be laughing at the sweeping generalisations and untruths in my post!

Edited by spitfire4v8 on Monday 12th November 07:55

Brummmie

Original Poster:

5,284 posts

220 months

Wednesday 14th November 2018
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spitfire4v8 said:
FarmyardPants said:
spitfire4v8 said:
From those graphs :

612hp/6.9litres = 89hp/litre

370hp/4.5litre = 82hp/litre
That’s a bit unfair on the AJP, the 6.9 has been mapped. My mapped 4.5 made 420.3hp (the only other mod being the SP exhaust)

Edit: thanks to your mapping skills smile
Hi smile I was assuming the cerbera had also been mapped seeing as its emerald rollers and they don't really go in for shootout days or random power runs, so assume it was a car that was in for mapping. If it was std it's a strong cerbera.
My post was a bit tongue in cheek anyway .. the engine builders will be laughing at the sweeping generalisations and untruths in my post!

Edited by spitfire4v8 on Monday 12th November 07:55
Yes, it was a mapped one, with an ECU swap if it was there more than likely.
Schmig, I'll give you a rip up the road next time I am there, dry tarmac needed as its a tad tail happy.
It is a strong engine this one now, my 6833cc motor even compared to the Crate LSX454 (7400cc) looks good, they are making just under 550hp on this dyno, so I am up 60-70bhp on those, maybe a little less torque under 4000rpm, but that really doesnt matter as tyres are struggling anyway, but the 454LSX is done by 6500 mine keeps going as you can see, still over 600bhp at 7500, i was scared to rev anymore, and pointless as peak is 7045rpm.
She sure does rev!


Brummmie

Original Poster:

5,284 posts

220 months

Wednesday 14th November 2018
quotequote all
Byker28i said:
so can we read from that the 4.5 AJP is more powerful.... over 7000 revs biggrin
Have another look, the BHP Graph is roughly double. smile


Brummmie

Original Poster:

5,284 posts

220 months

Wednesday 14th November 2018
quotequote all
Here is a 454LSX (7.4ltr) with a big intake (FAST) vs my 6.9ltr.