turbo 3.0l ignition

[Turbo3.0]

I recently finished a turbo 3.0 acclaim and after going for a test run and getting it tuned, it was still running pretty bad. I bought new NGK plugs and gapped them to .0300" and the car's now hauling ass, but it will still ocassionally misfire under boost (11psi) so I know it's an ignition problem. I'm going to regap the plugs to .025" but I'm wondering if I'm also going to have to get a stronger coil. What do you guys suggest doing when it comes to problems of misfiring under boost?

[turbovanman]

I would definatley replace the coil, its probably the original. Any stock replacement or one step up will be fine. What type of wires are you using. I hope a high quality like Aurora! MSD is ok, but there cheaply made. What type of plugs, standard or platinum? I wouldn't use NGK regulars, they don't seem to last very long. Bosch or Autolites regular seem to last, also go one step colder!

Got any pics, that sounds like a sweet ride?

"thumbs up

[Turbo3.0]

Thanks for the suggestions. I'm definitely going to have to do something, the stock ignition just isn't up to the task. The plugs are regular NGK's, but I know a lot of people who use them on their high hp cars and don't seem to have any problems. Pictures of the project are on the third page of the cardomain webpage below.

[turbovanman]

I will check them out. I am not saying NGK plugs are bad, just saying that they were alot faster than the other brands.

[Chief8one]

i also have a turbo 3.0l which i had for a short time and it went boom. now im rebuilding it with all forged components. when is it missing? what rpm and gear? id go with msd btm unit personally.

chief

[Turbo3.0]

It missfires anywhere above 300rpms at full throttle, but I'd say it missfires the most around 4000rpms. At half throttle it gets about 5psi of boost and runs great, but as soon as I get on the gas anymore than that it has a tendency to lose power at 11psi.

[lametec]

Are you sure you're not just running too rich/lean?

[Aries_Turbo]

what kind of instrumentation do you have? egt? a/f?

good luck

Brian

[Turbo3.0]

It's always a possibility that the air/fuel ratios aren't quite right yet, but I'm just assuming that it's most likely an ignition problem because of the major improvement after regapping the spark plugs. Right now the S-AFC settings are based on calculations regarding the 450cc injectors, lowered fuel pressure, and new MAP sensor. If anything, I made it so that it is running a little bit rich just to be on the safe side. I'd assume that I would get a check engine light with a rich/lean code if that were the case. The only instrumentation is the stock instrumentation along with boost/fuel pressure gauges.

[SANDMAN]

Run a colder plug.


Check the A/F or EGT if you have it and make sure you are running decent numbers. At 12psi on my 2.5 I kick upwards of 1560 on the EGT, make sure you have plenty of fuel to compensate.

[Chief8one]

u have the same problem as i did before my pistons decided to let go. good luck

[dodgeshadowchik]

lower compression, perhaps. i heard these engines only like up to 10lbs of boost until bad things happen, as they do run a slightly higer compression than most production and modified turbo cars. this is why turbo kits for like hondas only run 6-8lbs. id suggest beefing up the bottom end and lower the compression to go for more boost.

[Daytona5spd]

Hey, How did you work out the issue with the rear exahust manifold??? I have a 3.0 in my daytona and really need boost, badly!!! I was thinking about supercharger, but I would rather go turbo. Very nice design on the x-over pipe where the turbo mounts, who made that??? Please give me details!!!!!.

Steve

90 Daytona v6 5spd (NEEDS BOOST!!!!)

[Turbo3.0]

What I did for the rear exhaust manifold was use the stock one, cut off the back, gut out the internal walls with a torch, and then weld a sheet of steel across the back to close it off. This way I knew that everything would fit right. I have a flange and plan to eventually fabricate a better manifold, but this works fine for now.
I made the crossover pipe by setting up a wooden jig using the stock crossover piece. I then just kept cutting and fitting the 1 7/8" exhaust piping from Summit Racing until everthing fit right, and tacked it in place. My friend's dad is a pro at TIG welding so I had him finish it up. Getting the pieces to come together right was the hardest part, but we eventually got it to work.
The rest of the exhaust/intercooler piping was basically the same process of tacking exhaust pipe pieces together until they fit right, and having them TIG welded shut.

Quote:

lower compression, perhaps. i heard these engines only like up to 10lbs of boost until bad things happen, as they do run a slightly higer compression than most production and modified turbo cars. this is why turbo kits for like hondas only run 6-8lbs. id suggest beefing up the bottom end and lower the compression to go for more boost.

I don't think the compression is really a problem on these engines, especially when intercooled. If you ask me, they're ideal for boost at 8.8:1. Most honda engines are 10:1 + and run the same amount of boost as I do and are fine.

[SANDMAN]

What are you running to compensate for fuel? Vortech FMU etc? To me it sounds like you are running lean, with the gap at .030 it should be fine and not blowing out the spark unless your coil is that weak. I run .033- .035 gap, anything less feels like crap, anything more and I make the cylinder temps shoot up under a hard pull.