Could be a result of timing like Sharif said..the Evolution is a 36mm gate and can hold 14 PSI for sure... as seen on the Modified MAg car..

 

That was before I bent it.

 

Also Shariff he said he did this because of the boost spikes and that he would rather be safe than sorry for now. Also since I have boost creeps almost 90% of the time the UTEC cuts power I cant eve go past 5500rpms

 

Dude you car is going to be sick! its will be all done soon, what fuel return kit are you getting? I need one too so maybe we can get a better price if we get two

 

Hey George I am thinking about the AEM kit

 

AEM makes a return fuel kit for the Z links pics? whats your AIM mine is DrDubbz

 

ok I may be mistaken I totally forgot which one sam qouted me on

 

look how the a/f drops off around that area, that should be why power is dropping so much right ? if hes running pretty rich around 4800-5500 rpm then his power will drop significantly.

 

Sam is completely aware of the UTEC's Knock Thresholds. He is actually the only Authorized and Trained UTEC Tuner in California. The power numbers are fairly similar to the TNST car I tuned just before the end of the week. It also had a tendency to boost spike to almost 10 psi at times then settle. If I were tuning this vehicle I would have gotten it dialed as I could with the parts I had but at the same time I wouldn’t waste time trying to perfect something that is not working correctly.

Let's not forget this car has some minor issues that need to be sorted.

The power is falling off because he is dealing with oscillating boost. It can be noted by the dips in the torque. I am willing to bet every dyno plot looked different. It is nearly impossible to tune a car with a poor boost curve. Typically the boost will never track the same way so you are shooting in the dark hoping for a trend. When you are having boost control issues and they are isolated to a wastegate, you are better off using a larger wastegate than smaller. Due to the fact that in order to control boost you are essentially diverting exhaust gas from the turbine, more your can divert efficiently the better boost control will be. Quickly thinking about it the gate doesn’t seem to be the problem, need more info to draw a conclusion though.


Holding boost doesn't seem to be the problem again.. spikes and oscillation are a different ball game. For the record we have customers that hold 30 to 35 psi on a 35 to 38mm wastegate. If he was having an uncontrollable boost creep issue I would recommend a larger gate.

RED,

What are you using for boost control?


Thanks,

Jermaine@turboxs.com

 

Did he post a boost profile that I missed? When we have boost problems on the TN kits, we are usually seeing boost creep, not boost drops towards redline.

The power and trq drop-off at redline is likely one or all of three things. Boost drop, insufficient timing advance, or to much exhaust back pressure.

For those with the boost creep issue on the TN kit, larger wastgates did help.

Just trying to help.

 

I will be installing the greddy profec and am getting a larger wastegate as jetpilot did. I am not to worried about the drop in horsepower topend as it will all be fixed as soon as my boost issues are fixed.

I will try to post the other dyno graphs I have they are all different