Powers 4.3

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Discussion

phazed

21,844 posts

203 months

Monday 19th February 2018
quotequote all
It is always interesting to look at graphs to see how the power is made.

The advantage of the speed 6 engine is that it will rev and produces good power at the top end. The above figures being very good.

You might be interested in my old Rover 5.5 graph by comparison.

The lower figures are with the cam timed at 110 degrees
The upper figures are with the cam timed at 114 degrees

All runs done on Joolz dyno which gives, "non inflated" readings.


chris watton

22,477 posts

259 months

Monday 19th February 2018
quotequote all
GazzaM100 said:
I thought TVR quoted 350 from a 3.6L not the 4.0L in a Tamora
Back in the day (2002-2004-ish) there were plenty of threads (which can still be accessed), showing that the S6 produced more or less the quoted factory figures for BHP and torque, whereas the older V8's were massively under the quoted figures. These were tested on different dynos, and not just one, the 3.6 was/is usually around 350bhp at the fly, plus or minus 5-10 BHP, and the 4 litre, depending on flavour (standard. Red Rose) was 360-370BHP.

Compared to the RV8 models, the figures for the S6 seemed quite honest, I don't know where these new low figures for the S6 come from!

lawtoni

Original Poster:

258 posts

155 months

Monday 19th February 2018
quotequote all
I have now spent a few hundred miles in the 4.3 since the remap and whilst I'm less inclined to get into arguments over the headline figure (which feels about right from the car's performance IMO), I can reveal that it is fantastic!

Relentlessly fast! Possibly too fast for the public road. The acceleration does not seem to let up at all.

5th gear pulls like 3 gear did in the 3.6.
I've just ordered 4 new tyres to replace the 5 year old rubber that was on there before which I expect will help a great deal in taming the car.

So 470whp, 400whp or 100whp. It is marvellously quick!


FarmyardPants

4,099 posts

217 months

Monday 19th February 2018
quotequote all
m4tti said:
It is a magical dyno that’s for sure. Legend has it someone put an old mountain bike on the rollers after two cans of blue label monster and got 100hp. hehe
rofl

Byker28i

58,831 posts

216 months

Monday 19th February 2018
quotequote all
GazzaM100 said:
I thought TVR quoted 350 from a 3.6L not the 4.0L in a Tamora
Sagaris is a 4.0. I've been at two rolling road sessions with factory sags that produced 350-360bhp

One of those sessions had a rebuilt speed 6 at 384bhp.

Just think how well these cars would have sold with a reliable 450bhp when they were new. That would have been brilliant then compared to other cars around at the time.


Edited by Byker28i on Monday 19th February 20:52

roseytvr

1,788 posts

177 months

Monday 19th February 2018
quotequote all
lawtoni said:
I have now spent a few hundred miles in the 4.3 since the remap and whilst I'm less inclined to get into arguments over the headline figure (which feels about right from the car's performance IMO), I can reveal that it is fantastic!

Relentlessly fast! Possibly too fast for the public road. The acceleration does not seem to let up at all.

5th gear pulls like 3 gear did in the 3.6.
I've just ordered 4 new tyres to replace the 5 year old rubber that was on there before which I expect will help a great deal in taming the car.

So 470whp, 400whp or 100whp. It is marvellously quick!
Well said Paul, you pays your money and your happy with the result. Enjoy

Classic Chim

12,424 posts

148 months

Tuesday 20th February 2018
quotequote all
phazed said:
It is always interesting to look at graphs to see how the power is made.

The advantage of the speed 6 engine is that it will rev and produces good power at the top end. The above figures being very good.

You might be interested in my old Rover 5.5 graph by comparison.

The lower figures are with the cam timed at 110 degrees
The upper figures are with the cam timed at 114 degrees

All runs done on Joolz dyno which gives, "non inflated" readings.

Interesting how he’s taken out a little torque but gained quite a lot of hp.
Timing maybe.
Hmmm, food for thought wink

CanoeSniffer

926 posts

86 months

Tuesday 20th February 2018
quotequote all
I won't pretend to know anything about the S6, but what I do know is that I met a bloke the other week with a Powers 4.3 rebuild producing a genuine proven (give or take RR discrepancies) 400hp. He lives in Chippenham so whether the car was dyno'd at Powers or somewhere more local to him I'm not sure.

Contrast that to the Tuscan that did a dyno run at the NG open day with a 4.3 rebuild of unknown origin (could have been a reputable builder, I can't remember), which produced a pretty dismal number somewhere south of 240hp. Minefield! eek

Classic Chim

12,424 posts

148 months

Tuesday 20th February 2018
quotequote all
Here’s my 450 on Powers dyno after Mbe.
Standard P38 induction system etc no tuning mods as such so pretty standard, new cam but even that had 15,000 miles on it by the time this was done.
Catted too.
At the wheels so adding 15% roadtrain loss !
It’s still only about 292/333
But about right considering the spec of engine.
It sort of corolates on a drag strip too.

Going up against another Chim with 5.0 engine and tuned to about 315/320 hp but torque similar the Yellow car hehe pulls away over 4000 revs exactly where the hp is.
The results on a drag strip to me showed the difference in the power and how it shows in real life.
I believe the dyno from this testing.






Edited by Classic Chim on Tuesday 20th February 19:23


Edited by Classic Chim on Tuesday 20th February 19:28

GazzaM100

209 posts

137 months

Wednesday 21st February 2018
quotequote all
I went for a 4.3 not for more power as the 3.6 was plenty but because the parts that go into it are far better quality and give me confidence I her reliability

Jhonno

5,762 posts

140 months

Wednesday 21st February 2018
quotequote all
lawtoni said:
I have now spent a few hundred miles in the 4.3 since the remap and whilst I'm less inclined to get into arguments over the headline figure (which feels about right from the car's performance IMO), I can reveal that it is fantastic!

Relentlessly fast! Possibly too fast for the public road. The acceleration does not seem to let up at all.

5th gear pulls like 3 gear did in the 3.6.
I've just ordered 4 new tyres to replace the 5 year old rubber that was on there before which I expect will help a great deal in taming the car.

So 470whp, 400whp or 100whp. It is marvellously quick!
Exactly.. Numbers aside, you are happy with the engine, and it will be more reliable. Perfect. I am sure it is quicker and much torquier than it was!