A little hesitant...............
Discussion
To be a pedant, it's d-throttle, not de-throttle. 
Named after the throttle-delta - it basically takes averages throttle readings differently (read "fluffily"). Although it cures the symptoms, it doesn't cure the problem...
If the throttle bodies are worn, they should really be changed for replacements that won't wear again. Both SFR and Dreadnought TVR do replacements that won't wear the same. With the chip in, you'll naturally lose throttle response, because that's how it fixes the problem by its very nature - i.e. you'll be lowering performance. It can't make up for the fact airflow's f
d without costing you something... 
The chip'll be much cheaper/free when compared to the throttle body replacement, though. (Spent £300 on mine all in from SFR - no problems since) You could just see about having yours replaced with standard TVR parts again - should be good for another 24k miles, and they might have fitted bushes to the new ones by now.
>> Edited by J_S_G on Wednesday 27th October 10:58
Named after the throttle-delta - it basically takes averages throttle readings differently (read "fluffily"). Although it cures the symptoms, it doesn't cure the problem... If the throttle bodies are worn, they should really be changed for replacements that won't wear again. Both SFR and Dreadnought TVR do replacements that won't wear the same. With the chip in, you'll naturally lose throttle response, because that's how it fixes the problem by its very nature - i.e. you'll be lowering performance. It can't make up for the fact airflow's f
d without costing you something... The chip'll be much cheaper/free when compared to the throttle body replacement, though. (Spent £300 on mine all in from SFR - no problems since) You could just see about having yours replaced with standard TVR parts again - should be good for another 24k miles, and they might have fitted bushes to the new ones by now.
>> Edited by J_S_G on Wednesday 27th October 10:58
When mine was rebuilt two months ago at
Blackpool I had the throttle bodies done
at the same time. Car has done about 1500
miles since then and judder's badly when
held at a constant speed or slight acceleration.
Had it back to the dealer who fitted latest version
of d-throttle chip,still the same.Dealer says that
it must be the throttle bodies not bedding in properly
and has advised me to book it in at the factory
while the engine still has some of it's paltry 6
months warrenty left on it.
Col
Blackpool I had the throttle bodies done
at the same time. Car has done about 1500
miles since then and judder's badly when
held at a constant speed or slight acceleration.
Had it back to the dealer who fitted latest version
of d-throttle chip,still the same.Dealer says that
it must be the throttle bodies not bedding in properly
and has advised me to book it in at the factory
while the engine still has some of it's paltry 6
months warrenty left on it.
Col
happy_harris said:
Have a similar issue with mine and also with engine revs staying at 1200-1400 when in gear and staionary , dealer suggested that it was throttle bodies problem & best to change them sooner rather than later circa cost around £400.
If the dealer is going to charge you £400 for ones that're likely to have the same happen again (as it's a design fault, and I don't know that they've cured that oen), then you might be better off spending less money and getting some of the uprated ones fitted by SFR/Dreadnought... (I believe Dreadnought also supply theirs to Hexham Horseless for fitting, if that's any use, too)
As for the revs, I guess that could be related if the adaptive maps are trying to compensate, but it could be other things as well (seems awfully high) - could just be a sticky throttle. Is it ALWAYS at these revs, or just sometimes? Disclaimer: As ever, I'm no expert, and I'm absolutely sure the dealer knows best...
R666 TUS said:
When mine was rebuilt two months ago at
Blackpool I had the throttle bodies done
at the same time. Car has done about 1500
miles since then and judder's badly when
held at a constant speed or slight acceleration.
Had it back to the dealer who fitted latest version
of d-throttle chip,still the same.Dealer says that
it must be the throttle bodies not bedding in properly
and has advised me to book it in at the factory
while the engine still has some of it's paltry 6
months warrenty left on it.
Col
It could also be just one of the throttle pots going u/s.I had this on mine & it gave the symptoms you describe.
The good news is the replacement ones i believe are made of titanium or something more solid so should not see a repeat the problem.
throttle/rev's thing is not always constant and sometimes only 1100rpm , I,m spending most of my time driving round central london so hence lot of gear changing clutch dropping and crawling etc( a new clutch slave last month too !) but revs also drop straight away when you drop out of gear.
Given i had a lotus for 3 years before (I thought they fell apart ) tuscan ownership is a whole new league of problems and cost and problems !
throttle/rev's thing is not always constant and sometimes only 1100rpm , I,m spending most of my time driving round central london so hence lot of gear changing clutch dropping and crawling etc( a new clutch slave last month too !) but revs also drop straight away when you drop out of gear.
Given i had a lotus for 3 years before (I thought they fell apart ) tuscan ownership is a whole new league of problems and cost and problems !
happy_harris said:
Given i had a lotus for 3 years before (I thought they fell apart ) tuscan ownership is a whole new league of problems and cost and problems !
I had an Elise for 18 months before switching to Tivs. The only problem that ever had was needing a respray to the hard top for a bit of paint bubbling on the dodgy after-market paint job. It certainly is a different world in the land of Trevor. One thing I've always wondered about the throttle bodies... If they simply make them out of a harder material like titanium, then surely whatever the original ones were wearing on will start to get worn instead??
I had thought worn throttle bodies normally showed as as a fault when driving at a constant speed around 3000rpm and it felt like the engine was hunting slighty, or like driving into a head wind. Dealers normally lubricate them at each service so when they dry out a bit it's more noticeable.
If my engine ever(I mean when!) goes back to Blackpool again I will get the roller bearing throttle bodies as supplied by SFR and Dreadnought fitted at the same time.
cheers
Whitey
If my engine ever(I mean when!) goes back to Blackpool again I will get the roller bearing throttle bodies as supplied by SFR and Dreadnought fitted at the same time.
cheers
Whitey
whitey said:
I had thought worn throttle bodies normally showed as as a fault when driving at a constant speed around 3000rpm and it felt like the engine was hunting slighty, or like driving into a head wind. Dealers normally lubricate them at each service so when they dry out a bit it's more noticeable.
Had the hunting/bad running/general malaise from 1800RPM all the way up to the red-line (which was artificially low because of the same problem) when mine had the problem.
whitey said:
If my engine ever(I mean when!) goes back to Blackpool again I will get the roller bearing throttle bodies as supplied by SFR and Dreadnought fitted at the same time.
Dreadnought ones have roller bearings, SFR ones just have bushes, as far as I know. Know Dreadnought wouldn't fit them unless I went to Hexham Horseless (their English distributor), or all the way up to Scotland. SFR's less than 50 miles for me, so that's where I went. He had existing ones machined to his spec with whatever bushes/etc. necessary. So Shane probably won't just have stock of them to send out, either. (Hopefully that'll save someone the days of ringing round I had to do to try & sort it all out)
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