Okay so...

Mods are HKS PF drop in, Invidia N1 catback, Ultimate racing UICP. I am reading the boost levels off of my AP (Rel pressure) Also it is fully updated using the AP updater with beta allowed.

I run 94 octane fuel and the following are my peak boost results per map;

Stage 1 93 octane hks pf map: 26.5 psi peak boost (with boost pill in)

Stage 2 93 octane hks pf map: 27.4 psi peak boost (with boost pill in)


Stage 1 93 octane hks pf map: 28.7 psi peak boost (with pill out)

Stage 2 93 octane hks pf map: 29.7 psi peak boost (with pill out)

(I know cobb doesnt reccomend running stage2 with just a catback but I figured I'd try it out since others have said it would be okay, however I experience the issue on both stage1 and stage2)


Before getting my COBB AP I had the wastegate mod done (3.5 turns) but have since returned it to stock position... I double checked it again today by tightening it all the way and the backing it off 3.5 turns, still no help.

Anyone got any ideas? Am I going to blow my car up? Any suggestions are welcome.

 

knock retard?

 

it has to be your uicp.. the target boost for stage 1 93oct target boost 24 +/- .8.. so you're about 2psi over.. trying putting your stock uicp back on and see if it brings boost down.. then you know for sure

 

That is your peak boost, but what is your target boost(Does it settle, or does it hold your peak boost?). You will get a little spike because of how slow the boost control system is. Plus what gear are you in?

Either way as long as your not getting a lot of knock and not throwing any codes, the pressure you listed is fine.

 

Well it's consistantly spiking to the same amount each time I got WOT, target boost on Stage 1 is 24 psi and stage 2 is 25psi. Both are spiking about 2-3lbs over with the pill in and 3-4 lbs over with the pill out.


I've been testing in mainly 3/4th gear.


Also, I've never heard of a UICP causing overboost but could this be possible?

 

I had UICP with HKS drop in and stage I Cobb - I was fine. Have the same setup with CBE + TP now with the pill in and peak boost is just over 23psi.

 

what is it settling down to though. a 2-3psi spike over your target boost is fine.

 

Even if it spikes every single time?

 

Put the stock pill back in. That will lower your spike. If that does not work, you will have to zero out the the -20 load cell in the turbo dynamics table, aka, Turbo Boost Error Correction table. The -20 load cell has the number 5 in it. Set it to zero. That will cure the spike.

Edit: I just looked at the map your using. The target load/boost is way high. Cobb set the target load map A, B, C at 250, 252, 249 at peak boost @ 3500 rpm (In ECUflash these tables do not go higher than 159.4) But that is too high because the target load map is added to Boost Control Offset set at 100. So now the total target boost is 350, 352, and 349, unless in ATR the BCO does not add to the target load map.

Your car on stage two is probably hitting 250 load cell at peak boost load. The map in the ECU is demanding 349-352, assuming that in ATR BCO is added to the target load maps. So your off by a factor of 100. The ECU looks up the turbo dynamics table and adds the maximum 10% to the WGDC causing higher boost.

Again, I am assuming that BCO is added to the target maps as it is done in ECUflash. If BCO is not added, then the target boost in the maps is really good and the reason for the overboost is the removal of the pill and load cell -20 not zeroed out.

 

With the AP.

The pill is currently in but my AP is still reading 2-3lbs over.

 

Then you will have to zero out the -20 load cell in the tubo dynamics table. It has a 5 in it. Set it to zero and log and see what the boost is. I am assuming that you have an Access Port that allows you to edit the maps.

 

Yes I have access tuner race. I really don't know much about tuning though, I will take a look.

 

So you're saying I should change the -20 cell to 0? Is this the proper area you speak of?

[IMG]file:///C:/DOCUME%7E1/ADMINI%7E1/LOCALS%7E1/Temp/moz-screenshot.jpg[/IMG]

 

yes thats what he's talking about.. make that -20 cell 0 instead of 5 and go log

 

remember to use the map conversion tool from cobb after you edit the map before you load to your ap