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R33 Rb25det Not Performing To The Best :(

Shmee33

By Shmee33,
in Engines & Forced Induction

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Shmee33 Rising Star

Shmee33

Posted
Posted

Hey i have a R33 Rb25det that when driving threw gears its just not reving out,

it may have been a non turbo converted to a turbo in the past?

its just going up to about 5,500rpm till she seems like it dont wanna go further, sounds like its detting?

stock ecu.?

mods are front mount, custom plenum, pod filter.

PM-R33 Grand Master

PM-R33

Posted
Posted (edited)

What do you mean, when it gets to 5500rpm it doesn't want to go no furthur? It physically stops revving at that rpm or it continues to rev but slower?

Also you say it sounds like its "detting", im assuming you mean detonation however it won't be detonation, few people actually know what detonation sounds like and if you can audibly hear it than it is too late. However with your modifcations on a stock ECU it will be running rich so the chances of it detonating are slim.

I'm going to assume that you are hearing the engine missfire after 5500rpm which is causing it to not want to rev past 5500rpm and causing it to lose all power and drive like crap. What spark plugs are in the car and when did you last change them? You seem to have a common skyline missfire issue. Start searching for "missfire" "coilpacks" "spark plugs" and you will see how common it is.

Edited by PM-R33
PM-R33 Grand Master

PM-R33

Posted
Posted (edited)

Yep that is missfire. It means the spark can not ingnite the mixture in the cylinder due to a poor spark, usually caused by fouled plugs, too big of a gap or a weak ignition system. Change the plugs and see if it fixes it. Most likely it will, if not than you will most likely have to start looking at coil packs.

What spark plugs are you putting into it?

Edited by PM-R33
R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Also add to the fact the ole - factory ECU.

You've changed the intake properties of the motor via plenum and FMIC.

I dare say increased boost as well.

Couple that with old plugs as you've said... come's as little surprise its running like a bag of shit.

You'll also probably find once you change the plugs - it'll do the same thing again in 1,000km's due to the plugs getting fouled up again.

Moral to the story? Go get a tune!

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