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TVR Time.
 Chimera Chip upgrade.
Chimera, tappets replacement.
5.0
Griff, 5.2 conversion and performance upgrade
TVR
Uppgrades (Customer comments)
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 A rather Nice
pair of Chimera's turn up on the same day, One has a camshaft problem, the
other's problem is fuelling and performance.
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TVR
Tornado Chip Upgrade. |
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Although very fast top speeds
are easy from the Chimera, Engine/torque response through 45 -65 mph in higher
gears shows a very distinctive lacking,, This Chimera has all ready had the
pre-cats removed and is due to be transformed, "By just a Chip swap"
Also engine stalling and rough idle are
about to be a thing of the past.
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The ECU Opened and the "Tornado
Chip" ready to install, |
The ECU is easily accessed in the passenger foot well.
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Every TVR Tornado Chip is individually
mapped to meet your own engines specific requirements |
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| ECU Chipping details can be found by
clicking here, don't forget to use your
"Back" button. |
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What the
owner thinks now.
Chris,
Thanks very much for the time spent with chipping my car on Friday. After
leaving you and embarking on my journey home I had a great time the car is a
lot more flexible and there is definitely more get up and go.
There was a problem with the fuelling with the original TVR. chip it was
noticed as I got into traffic because it took a lot longer for the temperature
to come up. Also the stalling problem has gone even after I turned the idle
down to a more accommodating level.
The only fault that I feel that I'm going to have now the car goes better is
paying for a pair of Tyres every few weeks as just a simple overtake in 2nd or
3rd gets the arse end hanging out. Once again thanks very much. Mike Andrews.
red 4L Tvr Chimaera
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mike@andrem.fsnet.co.uk |
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Another TVR
Upgrade & More.
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The Story So far. ( More to
come. )
Its our best guess, that with the need to try to get anywhere near the BHP they
claim These engines are very Much "over-cammed" This TVR Chimera, at
only 30,000 had become very tappety and was subsequently ( at great expense)
fitted with a new set of tappets . (5000 miles ago) problem is, if you have
worn tappets, you also have worn cam, If you replace one without the other then
you will be back to square one as in this case only 5000 miles later. So now it
is getting the job done properly.
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| When you see how difficult and time
consuming the TVR engine layout is then, it not so surprising they did
not want to go so deep. |
You can see that the first cam lobe has become very rounded,,
its a fool, who would change lifters without the Cam. |
Even looking through the top, the coloration on all the cam
lobe's shows how badly it has been making contact with the tappets. |
At this time it up to the customers
discretion if we just put it back together with a new cam and lifters, or make
some further (recommended) improvements You would not believe, The heads on
these engines are as std Range Rover, no apparent improvements at all, and when
you consider this and the poor fuelling from the stock ECU chip, there is a lot
more to gain than you would believe.
The conclusion
Well, I wanted to go for a full Stage 3
upgrade, This would have got this TVR a Little close to the claimed 285bhp,
Indeed about 40-60bhp closer, But, it was not to be,
Down to Basics.
Some, So called experts may say it is Ok to fit new tappets without fitting a
new camshaft when all seems or looks good., Not so, In our books,
At only 5000, miles this TVR engine had new tappets fitted (without a new cam.)
by an appointed TVR. agent, They also had the Cheek to suggest the tappets must
have been all faulty when we told them they had all become worn or beginning to
wear. (what all 16?)
"Never" fit new Tappets without an new, Cam, " Honest,
Its the best way "
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three tappets have only done 5000 miles on the TVR engine they had been fitted
to. They all tell a story. from left to right its not looking good |
Top. Comparing Cams, At 35000 miles and no sign of wear,
The Morgan cam is still looking good
Below. This Cam did not take to its new tappets.
So it was bad then and worse now. |
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The left hand
Tappet shows it is completely worn out and after only 5000 miles it
was the worst one on the engine. As expected, it corresponded to the Camshaft
lobe that was most worn (probably the one that was the cause of the tappet
noise in the first instance)
The middle Tappet is also quite dished and
this was going to be the next one to become a major issue soon.
The left hand Tappet. shows the signs of
wear (rounded indentation expanding from the center all other tappets on this
engine at only 5000 miles where showing bad signs of wear and the 3 depicted
above represent the extremes and average condition of what we found and what
you could expect
By possible luck, at the same time as working on this engine we started work on
a Morgan +8 which was going through a stage 3 upgrade, its engine had done only
35000 miles and all the tappets where still in perfect order, indeed in better
shape (all 16) than the best of the tappets depicted above.
There are many further improvements available for the TVR500 and in reality, if
you put most on a Dyno, there where not many that actually broke though the
300bhp mark from the factory.
This is like the TVR Tuscans that raced, claiming 420bhp but only one ever
produced that for evaluation purpose, most where around 390bhp Notwithstanding
that, the light weight and superb handling of these vehicles coupled with
370FT/LB torque make them feel like 500bhp.
There are three main areas of achieving vast improvements to the output &
efficiency of this engine (without going inside) and would be as follows.
1. Tornado Plus ECU Chip, although this would only achieve about ten Bhp (when used alone) on a std 500 engine it would also claim back some of its missing power and could achieve far more, depending on you actually output at the moment engine response at all speeds would also be enhanced due to better, part throttle fuelling however when using the Tornado Plus Chip as part of the following package, up to 40 plus Bhp can be unlocked. £POA
2. 70 MM throttle body, further increases engine torque and over-all power,
this is simple to change as it is supplied already fitted into the plenum Top
3. 45 & 48mm Ram Pipes & Injection Manifold. Another reason why the
power does not come through is due to the poor quality of the stock (3.9)
injection manifold they use on this engine, like the heads this offers
appalling restriction even though TVR have fitted 45mm pipes, they are not true
“Ram Pipes” and are only flowed into the port flange. Our 45 mm
trumpets include correctly shaped bell mouths, matched to the intake ports and
blended/flowed all the way to the head intake ports. and for the real
enthusiast you could fit our 48mm ram pipes and Carbon fibre plenum top
Injection System Hardware upgrades.
Suitable for all type of Rover V8 injection
systems
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| Extensively ported manifold & shortened
trumpets |
Big throttle body plenum 70, 75 or
78mm |
Close up view of the shortened & polished
trumpets |
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| Modified & ported injection manifold (top
view) |
Flowed, shortened & polished trumpets (top
view) |
Extensively ported & flowed injection
manifold ports (intake ports) |
ECU Chipping is an essential part of all
upgrades
.Details can be found by
clicking here, don't forget to use your
"Back" button. to return
Although we do not have nay pictures top show you, You can
see the Dyno test results of our TVR 5.2, A true 334bhp is to be expected. All
the above products can be supplied exchange, it may be required however for you
to supply us with your intake manifold and ECU as exchanges are not always
available.
5.2 TVR Dyno Test results here
Once there Click on one of the right hand
graphs to get torque or BHP information compared to std TVR 500 griff, outputs
& don't forget to use your "Back" button.
TVR Tasmin 400se 1991 -
4.0L
Chris, Just a note to let you
know how the EEPROM change went. History of car: TVR Tasmin 400se 1991 - 4.0L
hotwire. Big Valve Heads and up rated camshaft (origin: Wedge Automotive, but
spec unknown). The car is also fitted with big bore 3" exhaust. The car
was over fuelling and was generally uneconomical. It was subsequently found to
have the 4.5L EEPROM in the ECU - obviously to try to increase fuelling after
mods. I purchased one of your Optimax chips and am generally pleased with the
results. It has cured erratic idle problems and given me an increase in
mid-range torque. It also makes the engine allot flexible - with the ability to
pull from lower rpm.
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TVR 4.3 Griff. T Wolk.
Germany
Hello Chris First of all i wish
you a happy and succesfull new year. I plugged in the Tornado chip and did a
little test driving. The road conditions were not good the last few weeks so i
could not run at full power, but i felt that the engine ran much better at low
revs. A rather uncomfortable behavior witch in german is called
"Schieberuckeln" (when the car starts rocking after RPMs fall under
1500 and the throttle is closed) is nearly eliminated. I look forward to the
improvement of the RPM range above 5000...
Reply.Assuming no engine component wear this may be down to
you ignition system, Want to upgrade it next. ??.
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Prices do not include local EU.Tax.(VAT).
Prices & stock are subject to change without notice. Information and
advice, as always, is free. |
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