Turbo help!!!

[lawrencex2]

Hello i hope someone can help me!

I have recently been having problems with my car. I have a 89 turbo lebaron and when the meter for my turbo gets around 15 boost my car has a major jolt like my engine just quits. If i continue to give gas it will jolt over and over when hitting around 15 boost...

Does anyone have any ideas what is wrong.. and what needs to be done to fix it..

Thanx
Lawrencex2

[SilverArrowZ]

I'm not sure what is wrong, as you provide too little information. I'm not a pro but my guess is that your engine might be having the knocking problem, which is either you give too much boost for the engine compresion ratio your engine had, or you use low octane fuel. Knocking occurs when the air fuel mix in the cylinder exploded before the spark plug ignite.

Or you can check your fuel system or fuel pump. My car doesn't have turbo but it jolted sometime because of a faulty fuel pump

[megotmea7]

yes, detonation is most likely the cause, if its a mojor jolt you should fix it asap as it could criticaly damage your engine. start with filling up with premium and run some injector cleaner throu it and change your fuel filter, if that doesnt do it then you should think about a new fuel pump and/or injector rebuild.

and is this car modded? i have no idea what a lebaron is nor what it normaly runs boost wise. if it is modifyed and the boost was raised the fuel system or ECU may not be able to provide the increased fuel and will cause the car to run lean, tune down the boost or buy an aftermarket piggyback fuel controller or stand alone engine managment system. if the fuel system is maked out larger injectors and a regulator and higher flowing fuel pump may be in order

[Waatz]

Im not to sure what a Leberon is but it sounds to me more like a "Boost Cut" problem, the engine ECU (Engine Control Unit) via MAP sensor (Manifold Actual Preasure) senses the amount of preasure or boost output by your turbo, this will be set to a predetermined maximum, when this maximum is reached the ECU will either cut the spark or the injector pulse thus inducing the "Jolt" you talk of.
My guess it that the vacuum/preasure line to the waste gate actuator is possibly broken or has been tapped into to increase boost.

BUT...... if the above replys are correct, try some av gas that should stop detonation :D

[fpv_gtho]

Well Avgas or any other aeronautical fuel can be hard to come by, and its also illegal for street use in alot of places so maybe some premium unleaded with octane booster is the better solution

[SilverArrowZ]

I think octane booster is not really a good idea to take care of the problem, but it is good for some diagnostic.

You can check whether if it is the problem about you using low octane fuel or not (if octane booster can get rid of the jolt, then it is the fuel you use). Continue to use octane booster is not a good solution, instead, try use premium fuel or lower the boost or reduce engine compresion ratio by switching the piston.

Why i say octane booster is not a solution simply because it is a form of addictive. All addictives are not really good if you care about your car's long term health. Sure they give some performance gain, but addictive like octane booster are reported to spoil the O2 censor in your car, and you end up spending money buying both octane booster and O2 censor parts over some long time of use.

I prefer to lower the boost, as it is easier, since I'm using the highest octane fuel i can buy from the gas station :p

[mulan]

I think octane booster is not really a good idea to take care of the problem, but it is good for some diagnostic.

You can check whether if it is the problem about you using low octane fuel or not (if octane booster can get rid of the jolt, then it is the fuel you use). Continue to use octane booster is not a good solution, instead, try use premium fuel or lower the boost or reduce engine compresion ratio by switching the piston.

Why i say octane booster is not a solution simply because it is a form of addictive. All addictives are not really good if you care about your car's long term health. Sure they give some performance gain, but addictive like octane booster are reported to spoil the O2 censor in your car, and you end up spending money buying both octane booster and O2 censor parts over some long time of use.

I prefer to lower the boost, as it is easier, since I'm using the highest octane fuel i can buy from the gas station :p

ok fuel aditives are very bad in older cars as they decoke the cylender bore and on older engines the cylender bore is normally worn this is were the coke gets into as a sort of tempory seal witch is good but the fule cleaners and aditives take this away witch is very bad and ure engine will run very bad or not at all

[ace]

Is the waste gate operating properly 15lb boost seems high for a standard car, it maybe over boosting and the resulting compression proving to much for the engine. :confused:

[V8turbo4me]

15 lbs of boost on a lebaron = major detonation problems if you have not done anything to check for and therefore control detonation, 14 lbs of boost is the limit before detonation on my VR-4 before modification so this could very likely be your problem.

[megotmea7]

for future reference octane booster does nothing noticable to the regestered octane of your fuel. gains of 2 tenths of a pojnt are considered a big gain with off the shelf boosters... not worth the money

[Waatz]

Ok if it is illegal I wouldn't recomend using it then.
Im still not to sure you problem is detonation, Just boost cut. My little Cyborg doesn't detonate at 16psi. I will be very interested to hear the eventual outcome of this little expidition.

[SilverArrowZ]

i'm not sure about cyborg but 4g63's standard boost is 19 psi if i'm not mistaken.

If oil addictives are really working, why didn't we see any major oil and petrol company manufacture any of these? Oil company already compete against each other to produce the best engine oil and petrol. If the addictives are really good, don't you think they will manufacture it and sell it too?

[Matra et Alpine]

for future reference octane booster does nothing noticable to the regestered octane of your fuel. gains of 2 tenths of a pojnt are considered a big gain with off the shelf boosters... not worth the money
"off the shelf" is the circital part there.
Harder-to-get (more effective) OBs are available from specialists.
Going to the local airport and buying AvGas is cheaper though :)

[Matra et Alpine]

If oil addictives are really working, why didn't we see any major oil and petrol company manufacture any of these?
They do.
In Europe Shell Optimax is an "high performance" OB-enhanced fuel sold at gas stations.
ALL petrols in the UK use OBs.
The frightening bit is in Scotland it's the same plant that produces all the varying brand petrols AND the OBs.
The tanker gets filled with the OB sepecified by the company but it's all made in the same place ( and the OBs are the same ! )

Oil company already compete against each other to produce the best engine oil and petrol.
Moot point but the reality is for 99% of the driving public all they want is cheap and while we've still plenty of crude the "octane booster" is higher fractionated hydrocarbon :)

If the addictives are really good, don't you think they will manufacture it and sell it too?
They do, but selling it is difficult as the best OBs are carcinogenic so in large quantities it consitutes an environmental hazard ( a bottle ! )

[SilverArrowZ]

True also.. i never thought of that. But oil company here don't do much, yeah sure thier target is at the mainstream normal driver. Shell is busy making people think that they can get more milage out of their fuel while petronas is busy making fuel that is "healthy" for the engine, cleans out carbon and stuff.

The truth? They seems to work. Shell seems to be able to get half a mile more per gallon than petronas on the same car; A close friend mechanic of my family also told me that most of the car he fix with engine prob are from shell, less from petronas.

Fuel addictive? They seems to be like drugs and really "addictive". I start using one of the award wining addictive that is made locally, sure it gives a few horse power more, but if i stop using it, the car seems to be less power compare to last time when i haven't use any. It take a few weeks to go back to normal. I'm sure it is not me, i can dyno it.

OBs are on the shelves.. but it is not popular here. I can go out and tell people about octane booster they will just scratch their head. Just asking is there any well known company with a good reputation on making these addictives?

[fpv_gtho]

Well Optimax is offered here, and its even the control fuel for the V8 Supercars. I dont think many people use it as they should, as for some performance tests etc. alot of people mention only using 95 octane premium rather than a 98 octane blend like Optimax.

Theres a brand of Octane Booster here called Nulon, that also make alot of other products like injector cleansor etc. and they claim that when used with Optimax, it raises the octane to 100 octane. Thats about 500ml for every 20L of petrol though so if you were to use it, it surely wouldnt be for street use

[Waatz]

I read in an automotive trade journal a while ago about the additives that are put into petrol. It said somthing along these lines.

Years ago engines were made of quality materials and the fuel was there to burn and push the pistons and it was basicaly pure, as the manufacturing of engines became more competitive and costs needed to be cut the materials the engines were made of lessened in quality and valve seat recession became a problem so lead was added to petrol to reduce this wear, it was then discovered that lead was bad for the enviroment and caused birth defects, so it was phased out of petrol and more additives were included into the manufacture of Petrol to stop problems like this, now the petrol we burn has many more harmful ingrediants and is the majour contributor to polloution and these additives also reduce the preformance aspects of petrol.

Please Correct Me If I Am Wrong!

[Matra et Alpine]

..... nah :)