replacement throttle-bodies

[andyoleary]

Hi all,

Does anyone know the up to date availability of replacement TB's for the SP6? I recall reading somewhere that Dreadnought in Scotland offered a better version that the original TVR set-up. Is there anyone else about that can offer a solution maybe? I am thinking of changing mine.

Thanks in advance,

Andy

[Whitey]

You can get the throttle bodies re-bushed by most of the TVR engine builder places. I know dreadnought were doing it years ago when a lot of the earlier cars had issues with these, but I would say most places now do it. I know for certain Henley Heritage do it with their ex factory engine builder. I think later cars had better quality throttle body bushes. I had my inlet manifold re-built including new throttle body bushes, butterflies and spindles last year by the now extinct TVR factory.

What are the symptoms you have which you think this will cure?

[andyoleary]

Hi Whitey,

Thanks for the feedback, I thought there might be other options about nowadays. Generally speaking, I find the running a little lumpy at low and constant rev's (below 3K) and it seems that if the throttle pots are re-set after balancing the bodies, it runs out of "trim" again not long after - maybe 500miles or so. So I thought I would look at the coil-pack, leads & throttle-bodies etc, with focus on the throttle-bodies (spindle mainly) first. I'll ask around locally to see if anyone can offer me a solution. Due for a service soon though too.

Cheers

Andy

[Whitey]

Hi Andy,

The problem I had(and many others with earlier cars)is very similar to you. I would only notice a problem when cruising at a constant speed say 3000rpm in 5th gear on the motorway. The engine would surge slightly like you were driving into a strong head/side wind.

My dealer and I knew what the problem was but the factory fobbed me off saying they had a fix etc(I'm talking back in 2001) which of course never eventuated and I gave up asking. As I did not do a lot of motorway miles I just put up with it.

Funnily enough the factory then rebuilt the inlet manifold for free last year anyway. Well not exactly free as they were replacing everything else apart from the crank and block, so hey why not the manifold too!

If you have the same symptoms then it's well worth doing. From memory Henley Heritage engine man said around £400, but that was back in 2005 I think.

The saving grace is you cannot notice it with the pedal nailed!

cheers
Whitey

[andyoleary]

Sounds like exactly the issue Whitey, although it also happens "between gears" - you know, when you don't have enough rev's to change up and too much to change down, get's a bit lumpy/hesitant then. Not major and to be expected somewhat I guess with the nature of the beast itself.

Saying that, I feel that it could be much better and I think the time has come to focus on this area I think. Suspension and front-end paintwork can move down the list a bit.... I'll have a ring round to see who can do what and at what price.

You're right though - nail it and it flies!

Cheers

Andy

[The Pits]

later cars were not better in my experience. I had a hesistation problem with my Sagaris at high revs which was due to wear on the throttle bodies. I've heard the dreadnought ones are excellent and were due to be used by the factory before it all went tits up. If my Tuscan 2 plays up I'll be giving dreadnought a call.

Edited by The Pits on Wednesday 13th June 11:00

[Buffoon]

From earlier threads on this topic, I thought the throttle body issue was at higher revs.

The low rev issue, I believe is somewhat different. I spoke to Austec on this and they assured me that the S6 is generally very smooth in lower revs. In my case the issue appeared when engine is warmed up, OK otherwise. Full throttle no problem.

I was getting a marginal amount of condensation in the oil system, and have subsequently sent it to TVR-Power for headgasket and TLC. Get back tomorrow all being well.

I hope in my case it is money well spent, it is easy to become a 'Nervous Nelly' when there are so many horror stories posted.

[Buffoon]

Buffoon said:

From earlier threads on this topic, I thought the throttle body issue was at higher revs.

The low rev issue, I believe is somewhat different.

What the blazes is this numpty on about??

Having got a few good nights sleep, I have to say that it is the high rev range problems with throttles that I find mysterious. Worn spindle bearings are most likely to be noticed at low revs where butterfly movement would be most pronounced. I tend to accelerate in higher gears when in traffic, to open the throttles up a bit more than you would in a low gears, to mitigate the problem. Far from ideal, and means I have to keep dropping back from the car in front.

Keep us informed on how you get on with yours Andy

Edited by Buffoon on Thursday 21st June 11:58

[andyoleary]

no prob mate,

I will be making some calls today/tomorrow to try to get an idea of what can be done, by whom and for how much. I don't find it a major issue to be honest, just want to know what could be done if I had a mind to.

Cheers

Andy