Supercharger owners!
Discussion
For those lucky few out there with the Ninemeister supercharger (this is the TPC kit for those of you in the USA)...
I have been getting a chronic misfire on anything over 30-odd percent throttle when the car has just got wet. The engine is brilliant in all other circumstances.
If I've just washed the car, or there has been a serious downpour, I get this mental misfire. It feels a bit like a rev limiter cutting in, or some of the cylinders not firing.
I'm assuming here that there is some electrical component getting wet that never used to get wet. Am I likely to damage the engine in this case? Misfires i.e. no spark is one thing, detonation is another (though it doesn't sound like detonation). Also, if it's obvious which component is getting wet, can I waterproof it?
There's nothing obviously dangerously exposed in the engine bay (it was a proper 9m install so everything's tidy), and it's got new dizzy caps on.
I have been getting a chronic misfire on anything over 30-odd percent throttle when the car has just got wet. The engine is brilliant in all other circumstances.
If I've just washed the car, or there has been a serious downpour, I get this mental misfire. It feels a bit like a rev limiter cutting in, or some of the cylinders not firing.
I'm assuming here that there is some electrical component getting wet that never used to get wet. Am I likely to damage the engine in this case? Misfires i.e. no spark is one thing, detonation is another (though it doesn't sound like detonation). Also, if it's obvious which component is getting wet, can I waterproof it?
There's nothing obviously dangerously exposed in the engine bay (it was a proper 9m install so everything's tidy), and it's got new dizzy caps on.
Were the plug leads changed? On a 993 I had a couple of cracked leads that used to let moisture in when wet and then arc like crazy!
It may help having the engine undertray on for the winter months if you don't have it fitted.
Sorry I don't nave a S/C, with that being mechanical I would assume your problem was more electrical?
It may help having the engine undertray on for the winter months if you don't have it fitted.
Sorry I don't nave a S/C, with that being mechanical I would assume your problem was more electrical?
clubsport said:
Were the plug leads changed? On a 993 I had a couple of cracked leads that used to let moisture in when wet and then arc like crazy!
It may help having the engine undertray on for the winter months if you don't have it fitted.
Sorry I don't nave a S/C, with that being mechanical I would assume your problem was more electrical?
yep it definitely feels electrical - the reason I mentioned the S/C is because installing it removes a load of induction gear from the top of the motor, so conceivably a component that was nice and dry under the manifold is now open to the rain.
I didn't have any aggro before the S/C, so I suppose I should run over all visible electrical connectors and bung rubber tape over all of 'em
Incidentally the engine undertray is still fitted. I reckon the water's coming in from above, given that we had to cut away a bit of the spoiler to clear the S/C pulley. Perhaps I just need to thoroughly waterproof the two dizzys...
Sounds like it could be the Dizzy's...On the RS the rear spoiler vent is open, in the past when I have been over enthusiastic with the wash bucket and got said Dizzy's wet the car has felt like it was running on 2 cylinders...loads of WD and some engine heat sorted it...I am more careful now.
I am about 7 miles from 7oaks I really would be interested to see your S/c conversion sometime,,,maybe you would also get some value out of seeing how Porsche lightened an RS ?
I am about 7 miles from 7oaks I really would be interested to see your S/c conversion sometime,,,maybe you would also get some value out of seeing how Porsche lightened an RS ?
A very similar topic was posted on the PCGB website and it turned out that the owner was being a tad enthusiastic with the bucket when washing it etc. I too would be very interested in seeing your supercharged motor as my car has a 993 engine (albeit in a 911 SC) and am not too far from 7oaks either.
Cyberface you cant assume its the s/c. As a fellow s/c'd 993 my flat spot turned out to be the mass air flow meterl - replaced it and all was fixed. FYI I drive mine in all weathers, leave on a slopping drive in the heaviest rain so all the rain off the car runs over the rear spoiler and never have an issue with dampness in the engine. Also I dont have the engine tray on. Still no issues. On another topic finally got all the work completed yesterday by 9m. Upgraded digi box, re mapped etc etc. (if you remember my s/chg install is 3 yrs old+). The car was good before its now even better and I am very happy. Hope you find your problem but I think it is going to be a process of illimination.
It's definitely a water-in-the-electrics issue, since I only get the stuttering immediately after I wash it, and it goes away once the car has dried out.
I'm simply assuming that the s/c installation has exposed some electrics somewhere that I need to re-waterproof. I'm sure there's nothing wrong with the supercharger, it runs brilliantly at all other times!
Colin - did you get a new power plot with the new 9m mapping? Does it make a significant difference? Mail me offline if you like.
As to the others near Sevenoaks - I'm driving it down to Verbier for some skiing just after Christmas so assuming I make it there and back without stacking the car, drop me a line in the new year
I'm simply assuming that the s/c installation has exposed some electrics somewhere that I need to re-waterproof. I'm sure there's nothing wrong with the supercharger, it runs brilliantly at all other times!
Colin - did you get a new power plot with the new 9m mapping? Does it make a significant difference? Mail me offline if you like.
As to the others near Sevenoaks - I'm driving it down to Verbier for some skiing just after Christmas so assuming I make it there and back without stacking the car, drop me a line in the new year
I have done some remapping work recently on CMJ's and in the process talked to Mike at TPC about issues with the running of the system. Turns out that he has come across the same minor problems that we resolved with CMJ's remap and has now incorporated them into a new universal 993 program that suits both the standard and chargecooled conversion.
I now have the updated map but it unfortunately arrived too late to load into CMJ's 9934S so as yet untested. With our slightly modified map the 4S made 300bhp at the tyre uncorrected which is in the right ballpark since they normally see 300-310. With the chargecooler kit Mike claims 350+ at the tyre. Thus, rather than do a lot more work on the stanard kit I would prefer to find a volunteer for the first UK chargecooled package and work on that instead. Good price going for the first in the queue!
Regarding your misfire, I guess that it is down to the distributor, since although we do not specifically do anything to it, the conversion removes the heater valve and thus exposes it to the elements.
I now have the updated map but it unfortunately arrived too late to load into CMJ's 9934S so as yet untested. With our slightly modified map the 4S made 300bhp at the tyre uncorrected which is in the right ballpark since they normally see 300-310. With the chargecooler kit Mike claims 350+ at the tyre. Thus, rather than do a lot more work on the stanard kit I would prefer to find a volunteer for the first UK chargecooled package and work on that instead. Good price going for the first in the queue!
Regarding your misfire, I guess that it is down to the distributor, since although we do not specifically do anything to it, the conversion removes the heater valve and thus exposes it to the elements.
ninemeister said:
With our slightly modified map the 4S made 300bhp at the tyre uncorrected which is in the right ballpark since they normally see 300-310. With the chargecooler kit Mike claims 350+ at the tyre. Thus, rather than do a lot more work on the stanard kit I would prefer to find a volunteer for the first UK chargecooled package and work on that instead. Good price going for the first in the queue!
Oh dear. Best not make 'must not spend any more money on my car' my 2005 new year's resolution then....
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