Why didn't my engine destroy itself???
#1
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Why didn't my engine destroy itself???
My engine should be in pieces all over Castle Combe after my stint on the track today. I was going great for the first 2 laps, then my Knocklink lights up like a ******* christmas tree telling me the engine is detting it's nuts off. So I back off and look down at my e-01, and peak boost was...............1.86bar!!!!!!!!!!!
Jesus christ, God only knows how it held together. Anyway I crawl off the track and pop the bonnet and dicovered the hose from the turbo outlet nipple to the Greddy boost control solinoid had come off, meaning the turbo was esentially running with the wastegate jammed shut
Anyway the car is running fine, no knocking or anything so I think I got away with it, but I'm worried it has damaged something
Jesus christ, God only knows how it held together. Anyway I crawl off the track and pop the bonnet and dicovered the hose from the turbo outlet nipple to the Greddy boost control solinoid had come off, meaning the turbo was esentially running with the wastegate jammed shut
Anyway the car is running fine, no knocking or anything so I think I got away with it, but I'm worried it has damaged something
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that beats my record lol
mine was feeling really strong one day and it hit its first ever fuel cut, i checked the guage and it was about 1.45 bar
same problem, the pipe had came off, its scince done it again and it was up to 1.49 bar
ive scince zip tied the pipe on
mine was feeling really strong one day and it hit its first ever fuel cut, i checked the guage and it was about 1.45 bar
same problem, the pipe had came off, its scince done it again and it was up to 1.49 bar
ive scince zip tied the pipe on
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I've cured it by fitting a jubilee clip.
I'm concerned about in not fuel-cutting though, I'm using a Dawes fuel-cut lifter, obviously set too high
I'm concerned about in not fuel-cutting though, I'm using a Dawes fuel-cut lifter, obviously set too high
Last edited by DreXeL; 24 April 2004 at 08:53 PM.
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Originally Posted by jameswrx
Yeah, it'd be a good idea to lower the fuel cut limit mate
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1.9 bar isn't so damaging as the detonation. Most turbos with a disconnected actuator will blow open the wastegate before the EGBP gets ridiculously high.
Trouble is that 1.9 bar will often saturate the MAF sensor's load calculation so you will go lean and advanced even if the map has some retarded run off for overboost.
You probably cleaned a load of carbon off your piston crowns, hopefully the bearings and ring lands are OK, there could be damage setup for later though. Impossible to say.
Trouble is that 1.9 bar will often saturate the MAF sensor's load calculation so you will go lean and advanced even if the map has some retarded run off for overboost.
You probably cleaned a load of carbon off your piston crowns, hopefully the bearings and ring lands are OK, there could be damage setup for later though. Impossible to say.
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#8
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Boost like that in the low/mid is not going to hurt unless it causes spontaneous det, it can cause mechanical damage but you would have known (snapped rod), you could have cracked a ring land but that won't show until it breaks off.
Map in low/mid shouldn't max the maf at all, and if it did it would run it off the end so the last row of the ign and fuel map would apply. relatively low timing there.
I would say you got away with it purely due to prompt action.
The crank and bearings are ok at that, theres a few araound regularly hitting 2 bar mid range with std crank and bearings on. Thats provided you had "good" oil in it.
bob
Map in low/mid shouldn't max the maf at all, and if it did it would run it off the end so the last row of the ign and fuel map would apply. relatively low timing there.
I would say you got away with it purely due to prompt action.
The crank and bearings are ok at that, theres a few araound regularly hitting 2 bar mid range with std crank and bearings on. Thats provided you had "good" oil in it.
bob
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Originally Posted by john banks
.............there could be damage setup for later though. Impossible to say............
The thing is I've got a load of goodies to be fitted to my car over the next few weeks:
VF34 Turbo
Hybrid FMIC
550cc injectors
Power FC to be mapped by Andy F
Tony Law equal length headers
Walbro fuel pump
FSE Reg
I already have a full decat and a K&N Induction kit, along with the Greddy boost controller.
Would it still be wise to fit all that?
Last edited by DreXeL; 25 April 2004 at 02:46 PM.
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As in you could have given the bearings or ring lands a pounding and weakened them with that big detonation event. Would go ahead with your mods anyway. Hopefully it will be OK, you'll know in a few thousand miles.
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Thanks for the comments John and Bob. I'll go ahead with the planned mods. I'll keep my fingers crossed for the next few thousand miles .....
#13
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Oil is fine, the boost itself is of no consequence being a limited event, as John mentioned its wether that coupled with det has caused damage, I would say not, whilst det is a killer its suprising what an engine will stand, assuming you had your iknocklink on max sensitivity and you reacted at the first sign then there should be no problem.
Issues relating to the maf are the hardest to legislate for.
bob
Issues relating to the maf are the hardest to legislate for.
bob
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Originally Posted by StickyMicky
that beats my record lol
mine was feeling really strong one day and it hit its first ever fuel cut, i checked the guage and it was about 1.45 bar
same problem, the pipe had came off, its scince done it again and it was up to 1.49 bar
ive scince zip tied the pipe on
mine was feeling really strong one day and it hit its first ever fuel cut, i checked the guage and it was about 1.45 bar
same problem, the pipe had came off, its scince done it again and it was up to 1.49 bar
ive scince zip tied the pipe on
Thanks
Johnny
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Johnny:
It's the pipe on the Turbo outlet nipple that goes to the boost control soleniod. I'm running a Greddy Profec e-01 which uses it's own soleniod, the tubing supplied is quite big and doesn't fit as snugly as the OEM pipe. I don't know whether StickyMicky was refering to the standard pipe or something similar to mine. I don't think you'll have the same problem on the standard pipe.
It's the pipe on the Turbo outlet nipple that goes to the boost control soleniod. I'm running a Greddy Profec e-01 which uses it's own soleniod, the tubing supplied is quite big and doesn't fit as snugly as the OEM pipe. I don't know whether StickyMicky was refering to the standard pipe or something similar to mine. I don't think you'll have the same problem on the standard pipe.
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