need some help please

[pulsar gtr]

I installed a t28 high flow with 550cc injectors and reprogrammed the ecu at jwt on my ca18det, every thing was running like a charm. I was pushing the engine very hard last week, and I noticed that around 230km/h a big cloud of smoke was behind the car . let go of the gas and the smoke was gone.I was running mobile one synthatic oil 10w-30, I thought I blew up the engine, blow off valve did spit lots of oil as well when that happened.

So I did a compression test, and I got 155psi on 3 cylinders and 162psi on the fourth one. I also did a leak test on it. and all four cylinders were in an excellent condition.I found out that the oil line that goes from the valve cover to the hose after the air filter was causing all that, it was spitting the oil into the turbo and then to the intake. I was told to use mobile one 15w-50 since i am running and reving the engine hard. so I did. I removed that line from the valve cover and routed it to a temporary bottle to see how much oil is it spitting from there and it was a quite a bit.

after I disconnected that line and changed to a thicker oil, the car still smokes bad when I push it. I am not sure if that becuase the oil that is still in the intercooler or some thing else is causing it to do that.Any ideas, compression and leak test measured very good but I am puzzled now. I would appreciate some help please.

Thank you,

PUlSAR GTR

[slw240sx]

hey what color smoke, may be extra fuel!! thats what mine is and your using a JWT ecu so they run rich as it is, i bet theyve never had a real life Ca18det in their shop so i bet they are guestimating on your fuel and timming maps, leaving you richer then normal under hard driving, blow by on turbo cars is normal , yes you may be burning oil left in the IC, i woulnd worry too much, keep and eye on the EGTs and and air to fuel ratios i bet its black smoke and your just over fueld .

[pulsar gtr]

I don't believe that the jwt ecu is the problem, since I had it working fine for over 2 weeks.

What causes the oil to go through that line on the valve cover to the back to the hose after the air filter, I know a bit of pressure will cause that, but I have quite a bit coming through there.

Does it mean that i have lots of pressure there, and if so what should be done to correct that problem.

Thanks again,

PULSAR GTR

[boost_boy]

I would safely assume you were running the car at around 15psi and for a longer than normal run? Let me tell you a little something about the motor, the ecu and the programmer. The motor is good, the ecu is probably not programmed the best to suit your application, so possibly not a great program (could be wrong). My engine used to that and then the #4 piston slightly melted, but compression was good all the way across the board. Everytime I would squeeze the throttle hard, oil would fly all over the place. Now since yours is coming out the back and in smoke form, maybe your turbo is crapping it's seal or your rings are starting to crap trhem selves or maybe even you leaned out a piston under W.O.T operation and that's where I give the JWT ecu's thumbs down. My experience with them is vast enough to say this because my Pulsar ECU was the 1st one they had ever did and was used on an experimental basis to establish a decent program. I lost 5 pistons because of this and they all had symptons similar to yours. It could be just a weak turbo seal letting off that synthetic oil and I don't recommend using that thin of an oil on these engines. 20w50 from synthetic blend with Lucas oil stabilizer is the way to go (at least for me).

[pulsar gtr]

Thanks guys, that makes sense, the other problem is , why is the oil shooting out through the line on the valve cover, (the cover right above the turbo).

thanks,

PULSAR GTR

[boost_boy]

Quote »Thanks guys, that makes sense, the other problem is , why is the oil shooting out through the line on the valve cover, (the cover right above the turbo).[/quote] I tried to give you all asessments as to what your problem could be. When you start seeing oil coming out of the breather tube from the valve cover of a CA18DET, it's usually time for new rings and pistons. It's called excessive blow-by only you're spraying all of your oil instead of smoke and a few other things. Pretty soon and if you keep hammering your car enough, you'll hear your bottom end rattling because as you're spraying all of your oil out of the engine under boost, your bottom end goes through momentary starvation. If you think I'm wrong, keep hammering it and showtime is eminent!

[pulsar gtr]

Hi boostboy, Thanks for your input, every thing you said makes sense, and I never doubted you for a sec, Thanks for you help, I guess, it is time for some forged pistons, any recommondation on the specs of the pistons with the setup I currently have.

Thank you,

PULSAR GTR

[boost_boy]

If the bores are not damaged, you can get a set of wiseco pistons and have them make them at the stock bore, if some isn't already made. In this case, you would only have to remove the head and the oil pan leaving the block and transmission in the car. Do a light hone to all cylinders clean, clean up the residue from the stones, get the rods re-shotpeened, get some new rods bearings, install the new rings on the new pistons, install the new pistons, install new headgasket and headbolts as well as new water pump and timing belt and you're off to the races again. I don't mean to make it sound easy, but in all honesty your situation is not that bad. You can just turn the boost down to say "10psi" and that should help with the problem you're experiencing.

[pulsar gtr]

Thanks, again for your input.

Does wiseco pistons company know the factory specs of the ca18det, also I live in Canada, and I can't find any were that I've looked a metal head gasket, except in Australia, do you know any place in North america that sells metal headgasket

Thanks again,

PULSAR GTR

[boost_boy]

Quote »Does wiseco pistons company know the factory specs of the ca18det[/quote] Go to http://www.raceengineering.com and inquire within about the CA18DET pistons. Let them know that a friend miami sent them a spare to duplicate (twice) and wondering if they can get you a set off the shelf.Quote »do you know any place in North america that sells metal headgasket[/quote] My metal gasket is made by NISMO and was ordered through a friend. I'm sure there are some companies who can put together a gasket for you, but I do know that there are companies that do copper gaskets for the CA18.