LOTUS ESPRIT TURBO S3 BOOST GAUGE QUESTION.
Discussion
Hi Andrew ,
The same thing is occurring on mine , but mine is caused by a leak between the manifold and the wastegate adapter pipe I think . I,m biting the bullet and removing the engine and box and renewing all belts ,gaskets etc and checking the wastegate . I would assume that you should register boost even if stationary as it is built up by engine revs and not load / roadspeed .( My wifes Saab Aero guage shows boost whilst stationary )My car too has only done 1000 miles with 2 engine rebuilds .The previous owner didnt drive it enough . I think the moral is DRIVE THEM !!. I,m no mechanic but I hope the above helps.
Richard
86 Turbo S3
87 S3 H/C N/A
The same thing is occurring on mine , but mine is caused by a leak between the manifold and the wastegate adapter pipe I think . I,m biting the bullet and removing the engine and box and renewing all belts ,gaskets etc and checking the wastegate . I would assume that you should register boost even if stationary as it is built up by engine revs and not load / roadspeed .( My wifes Saab Aero guage shows boost whilst stationary )My car too has only done 1000 miles with 2 engine rebuilds .The previous owner didnt drive it enough . I think the moral is DRIVE THEM !!. I,m no mechanic but I hope the above helps.
Richard
86 Turbo S3
87 S3 H/C N/A
Danny that is unusal to have constant boost at hwy speed. I do get a little boost, maybe .3 when I go above 70 mph at minimal throttle. Of course I get the usual boost if I open up the throttle at that speed.
I rev my car into 4-5K and get lttle or no movement while stationary. When in motion I get a lot of boost after 3K. I think it has to do with VSS in the right rear hub that tell the ECU how hard to fire the turbo.
The older cars do not have the VSS or ECU so I'm not sure how the turbo would react when reving while stationary.
Calvin
I rev my car into 4-5K and get lttle or no movement while stationary. When in motion I get a lot of boost after 3K. I think it has to do with VSS in the right rear hub that tell the ECU how hard to fire the turbo.
The older cars do not have the VSS or ECU so I'm not sure how the turbo would react when reving while stationary.
Calvin
I would check for a leak on the inlet system but in general it is not uncommon to get very little boost whilst stationary.
The turbo requires a lot of exhaust gasses to start spinning fast enough to produce boost, the exhaust is not only a function of revs but the amount of fuel, so more throttle and revs the more gases, hence more boost. Also this needs to be sustauned for a period whist turbo accelerates to speed (lag)
When stationary there is no resistance and very little throttle is needed to rev the engine. Blipping the throttle will not cause enough gases normally to spin the turbo to required speed unless a very small turbo (saab).
Mine does move a little (from memory) if i give it plenty of revs but allowing for gauge inaccuracy etc it is possible another may not move at all.
Obviously another with similar model could confirm this.
The turbo requires a lot of exhaust gasses to start spinning fast enough to produce boost, the exhaust is not only a function of revs but the amount of fuel, so more throttle and revs the more gases, hence more boost. Also this needs to be sustauned for a period whist turbo accelerates to speed (lag)
When stationary there is no resistance and very little throttle is needed to rev the engine. Blipping the throttle will not cause enough gases normally to spin the turbo to required speed unless a very small turbo (saab).
Mine does move a little (from memory) if i give it plenty of revs but allowing for gauge inaccuracy etc it is possible another may not move at all.
Obviously another with similar model could confirm this.
Del-Esprit said:
I would check for a leak on the inlet system but in general it is not uncommon to get very little boost whilst stationary.
The turbo requires a lot of exhaust gasses to start spinning fast enough to produce boost, the exhaust is not only a function of revs but the amount of fuel, so more throttle and revs the more gases, hence more boost. Also this needs to be sustauned for a period whist turbo accelerates to speed (lag)
OK THANKS FOR THAT, ITS NOT LEGAL TO TAKE ON ROAD AT THE MOMENT SO I WILL SEE WHAT HAPPENS WHEN IT IS.
When stationary there is no resistance and very little throttle is needed to rev the engine. Blipping the throttle will not cause enough gases normally to spin the turbo to required speed unless a very small turbo (saab).
Mine does move a little (from memory) if i give it plenty of revs but allowing for gauge inaccuracy etc it is possible another may not move at all.
Obviously another with similar model could confirm this.
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