5k rpm jerk.

[samvdb89]

Put in my new IAC today and it fixed alot of my problems, but one it didn't fix..

I can do pulls pretty well, kinda feels like my turbo doesn't kick in all the way but i can hear it spooling with my windows down, pulls great up until around 5k then jerks violently and i let off the accelerator immediately for fear of harming something, first time this happened i got alot of oil on the lower part of my firewall, but other than the jerk at 5k it drives great. motor has almost 20 miles on it.

Any ideas why it jerks at 5k, and how it can be fixed?

~thanks!

 

[gofer]

motor has almost 20 miles on it.

Any ideas why it jerks at 5k, and how it can be fixed?

~thanks!

The motor only has 20 miles or less on it and your going into boost doing WOT pulls? http://www.dsmtuners.com/forums/newbie-forum/215733-engine-break-breaking-motor-break-merged-10-6-a.html

 

[samvdb89]

Not like lauches, I dont know if i used pull the right way. Not sure what "WOT" means..

Start in first accelerate quickly but not full throttle up to about 4500, shift
2nd gear up to 4500, shift
3rd up to 4500, shift
4th cruise around 2-3k for a few seconds, downshift
Engine break in 3rd, downshift
Engine break in 2nd,

then start over again at 2nd.

there is some cruising light throttle in there just to get to a street down the road, and i dont have a boost controller installed so it's running stock boost.

accidently hit 5k once or twice.. thats how i noticed it..

 

[gofer]

Not like lauches, I dont know if i used pull the right way. Not sure what "WOT" means..

Start in first accelerate quickly but not full throttle up to about 4500, shift
2nd gear up to 4500, shift
3rd up to 4500, shift
4th cruise around 2-3k for a few seconds, downshift
Engine break in 3rd, downshift
Engine break in 2nd,

then start over again at 2nd.

there is some cruising light throttle in there just to get to a street down the road, and i dont have a boost controller installed so it's running stock boost.

accidently hit 5k once or twice.. thats how i noticed it..

WOT = wide open throttle

Whatever the case maybe I wouldn't be trying to fix the "jerk" at 5k until you get 500 miles on the motor.

Is your mods list up to date? That way we can help get you pointed in the right direction? Fuel pump? Injectors? Engine management (SAFC / dsmlink)?

 

[Mph]

I have about 500 miles on my motor and still rarely pass 4500 RPM. Not sure if you should put that much stress on it so soon. Just my opinion.

 

[samvdb89]

It is current, other than i did forget to put the 255 walboro fuel pump i put in before i rebuilt the motor.
Everything is stock, besides having the block bored 0.020 over, evo IX pistons, and Balance shafts removed. It has all new timing parts, waterpump, seals, gaskets, rebuilt stock head, original cams, oem injectors, oem plug wires (not new), new spark plugs, and a used IAC.

Break In Secrets--How To Break In New Motorcycle and Car Engines For More Power

this is where i got my idea for break in from.