I recently had some evoms wastegates installed on my k24s. Initially, eveything was great and I was seeing 1.1 bar sustained easily with spikes of 1.3. However, the last few days, I had noticed a huge drop in power and throttle response. I was maxing out at 0.8 bar and had almost no boost buildup in lower rpms. I tried disconnecting the battery today, and found that everything reset back to normal and the car was running great again... 1.1 bar sustained, 1.3 spikes. But after a few runs, it started crapping out and is now back in this "semi-limp" mode.

Is 1.1 bar really overboosting? Is there any other reason this could be happening?

btw, I'm using the pump fuel GIAC k24 file.

 

My guess is that you sprung a leak somewhere...with the better boost you probably blew a hose connection. Get the codes read. 1.1 is not enough for TB shut down.

 

I know what is wrong.. had the same thing with upgraded WGs....
u actually are overboosting and hitting 1.3 bars causing the TB to shutdown and or making the car to go into limp mode... wait till it gets cooler u will have many more such problems...
thats why a Protomotive ecu with a greddy EBU works great because u can controll the WGs from the cockpit based on ur barametric pressure and or temps. Also, it does not have the 1.3 bar limp mode.
I knew it was going to happen to you.. I tried to tell you but I recall you telling me you didnt want to spend money on the car...
bring the car to me and Ill tell u what is wrong and how to fix it.
I think ur boosting too much.
markski

 

i am holding 1.3 bar in 4th gear and up on GIAC k24 file with no problems. i also have the upgraded wastegate springs....

 

thanks for the tips guys.. i think there is something else going on here...

I disconected the battery again and everything felt liike it was back to normal.. good boost buildup, throttle reponse, 1.1 bar. I then started to push it hard around a turn. At around .7 bar I heard a faint air 'psshh' noise from the passenger side and I could immediately tell that the car was back in limp mode. I tried a few more runs and I was back down to .8-.9 bar. I visually checked my hoses, and everything looks intact.

This really has me stumped.

 

Did you blow your DV's? Get the codes read...I still say boost leak.

 

Ok now ur describibg a boost leak... loose hose.... lets hope ur not blowing the IC hoses off...

 

but its odd because if I disconnect the battery, everything goes back to normal and I'm able to get a few good runs at 1.1 bar before it goes limp. Would this happen even with a boost leak?

I have the evom silicon hoses.

im gona go get a code reader...

 

thats why I still think its may be limp mode...

does the car run OK in this strange mode???

 

Test the wastegate adjustment by disconnecting the battery again and turn the adjusting nuts on the wastegates back 2 full turns and try again. If this fixes it, you can try going one more turn forward and see how it does.

 

I read the codes and I get 'Engine overboost condition'

I guess that answers that...

I took a look at the wastegates from below the car.. there are two nuts on the rod. Which one would I turn? If im looking towards the front of the car, would I turn it clockwise or counterclockwise?

Thanks again for all the help!

 

I got that code once and it had nothing to do with the wastgates...it was the ecu program...starving the engine of fuel (with the new wastegate springs installed) You may need an ECU adjustment..or just back off the wastegates as suggested above. I think it is counterclockwise, but you need to be sure...also make sure both sides are adjusted identically (measure each one...carefully).

 

If I recall correctly, you should move the nuts back. Remove the clip and mark the rear most nut. Turn it two full turns, so it moves rearward (counter clockwise). Tighten the front most nut towards the rear nut to take up the gap you just created and once they are tight, reinstall the clip to set the new location. Do the same on both sides. I think this may fix your problem.

 

I would not do the adjustmenst of I was he.... he can screw it and make things worse... especially if he haver did anything remotely similar...
are u sure u have a GIAC stage xxx ecu???

 

I don't know, Mark. I had to do it with my stage 4 - k16/24's and it was a simple adjustment and fixed it instantly. I would go into limp mode fairly consistently until I adjusted it. After the adjustment, no problems...

If you mark it, you can always put it back where it was...