So, over the 4th break, I installed the Wagner Competition FMIC on my GP.

After driving for a couple weeks, it feels like there is more turbo lag. Is this in my head, a common effect (without a tune), or did I do something wrong?

Changes:
NM short shift
Royal Purple Synchromax tranny fluid
Wagner FMIC
M7 hot pipe

In all, I am not thrilled with any of the changes and I feel like it was better before.

 

There is probably a little pressure drop but if you get it tuned the benefits of a bigger intercooler become evident since you are upping the boost.

 

I would make sure you have no leaks or issues as my GP was so much better with the Forge intercooler and our res delete pipe.

 

I think it is in your head. The intercooler itself won't do much for performance, and if you had a boost leak you would be getting a CEL.

I have the Wagner, I did before/after datalogs of a 3rd gear pull from 2000rpm to redline, exact same place, only difference was the day. No performance difference, the time from 2000 rpm to redline was identical, though IATs were considerably lower with the Wagner.

It makes sense if you think about how the ECU works, fuel calculations are based on the mass of air flowing into the engine. The improved intercooler will give you lower IATs for sustained high boost, which will allow you to maintain HP on the track. But on the street you are only in boost briefly, which means the stock IC has plenty of time to recover. As mentioned above, you need to get a tune to take full advantage of the lower IATs.

 

Thanks.
No CEL, blow off still seems normal. Just feels like it takes longer to get to 2k RMS and the turbo to kick in.

Any specific was to check for a leak?

The tune is coming, just piece-mealing the process.

 

Any modifications to air intake yet ? Drop in filter or aftermarket set up ?

 

Way, are you still running stock intake/filter with your GP2's mods or were there improvements made there to enhance the ones made downstream.

 

are you monitoring boost level with a scangauge or similar? the intercooler is to keep IAT under 100 degs since above that the engine will pull timing.

 

Stock intake, K&N drop in. No CAI, as I thought they had no effect on forced induction.

No scan gage. Just stock so no clue on the boost.

 

I've got the old JCW stg 1 filter box and bottom half of N14 airbox to make it work.

 

You certainly can have a small boost leak without it triggering a code, it has happened to me. When the car was new from the factory it seemed slightly more sluggish than I expected. When I looked at the boost on scan guage it seemed not to correlate with what I expected from previous JCW's. When I took it on the track after a couple of sessions it eventually threw a code. Took it back to the dealership who found a very small air leak from one the hose clamps. When it was fixed it was like a new car This was very subtle, for example I was doing 1.52 lap time whereas in my old JCW I was doing 1.50. Just taking a little edge off things, not diabolical.

When I put an intercooler on I certainly did not feel like there was any lag etc.

So seeing what you are describing I suspect you possibly have a very small boost leak, or a small constriction somewhere.