I've lost most of my pops and bangs
I've lost most of my pops and bangs
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A900ss

Original Poster:

3,314 posts

182 months

Friday 6th June 2014
quotequote all
I haven't driven the Chim for a few weeks due to Trumpetgate and holidays but since I last drove it I've changed 3 things on the car.

Fitted the trumpets correctly, a new fuel pressure regualtor and a new ignition module and now most of my pops and bangs have gone. I used to be able to get her to pop and bang on demand, slight throttle on the overrun and she'd be off.

No more. I've just been out for a quick spin and only one (minor) pop in an hours driving.

I guess this is a good thing really as it should mean the car is burning the fuel more effeciently so I'll either have more power (can't feel any) or less fuel being used (time will tell).


TimJM

1,497 posts

240 months

Friday 6th June 2014
quotequote all
A900ss said:
I haven't driven the Chim for a few weeks due to Trumpetgate and holidays but since I last drove it I've changed 3 things on the car.

Fitted the trumpets correctly, a new fuel pressure regualtor and a new ignition module and now most of my pops and bangs have gone. I used to be able to get her to pop and bang on demand, slight throttle on the overrun and she'd be off.

No more. I've just been out for a quick spin and only one (minor) pop in an hours driving.

I guess this is a good thing really as it should mean the car is burning the fuel more effeciently so I'll either have more power (can't feel any) or less fuel being used (time will tell).
Perhaps you had an air leak before that has been fixed now. I don't know why it affects pops and bangs but a number of years ago in a Cerbera (again different engine I know but similar scenario) it started popping and banging an insane amount. The slightest lift of throttle or blip on overrun and it was off - much more than usual. I pulled over to check if I could see what was causing it and one of the air intake pipes had come off an intake (just one of the 8 mind). I put it back on and it went back to normal - quieter and popping and banging when it should not constantly.

So in my experience if air was being sucked in at/around intake due to a leak or crack (or in my case an intake hose coming off) it does produce far more pops and bangs.

I guess what I am saying is maybe you have fixed something and the engine is now running correctly.

A900ss

Original Poster:

3,314 posts

182 months

Friday 6th June 2014
quotequote all
Thinking about it, I also replaced the crankcase ventilation rubber hoses, the vacuum hose from plenum to stepper motor, the vacuum hose to the dizzy and the vacuum hose to the fuel pressure regualtor as well.....


Fire99

9,865 posts

259 months

Friday 6th June 2014
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As already said, You may have resolved a problem and as such you now have more accurate fuelling (hence no pops n bangs)

A900ss

Original Poster:

3,314 posts

182 months

Sunday 8th June 2014
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I was trying hard today to get the pops and bangs and they are there but only above 4k revs.

I've also hooked it up to Rover Gauge and my long term trim has come down since the last time I took it (odd bank from -48% to -6% and even bank -45% to -24%) which must also be a good thing getting closer to zero. The short term trim seems to fluctuate less when driving as well.

At idle


Driving

Alexdaredevils

5,697 posts

209 months

Sunday 8th June 2014
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Tvr owners...... Not happy when cars not running right, and still complaining when the cars fixed tongue out

zacherynuk

353 posts

163 months

Sunday 8th June 2014
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^ Hah!

A900ss

Original Poster:

3,314 posts

182 months

Sunday 8th June 2014
quotequote all
Alexdaredevils said:
Tvr owners...... Not happy when cars not running right, and still complaining when the cars fixed tongue out
Aren't we all like that? biggrin

pjac67

2,040 posts

282 months

Sunday 8th June 2014
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You'll be going for low emissions next Karl !

- I'll keep my pops and bangs any day.... (and flames and 50 mpg..) - hopefully still there when my car is back this week !

Catch up soon, Paul.

A900ss

Original Poster:

3,314 posts

182 months

Sunday 8th June 2014
quotequote all
Is that the 5.4 coming back?

It's been a long time...

I'm at thunder in the tunnels and then off to France with the wife and Tiv this month. Hopefully we'll have a Bristol meet in July.

(Or another run up to the Triangle which I'm very keen on doing again. It in the dry).