Hey guys. Took the car, '06 IX SE, to the dragstrip for the first time with a few new upgrades. The car previously went 12.49@109 on just a TBE, 20psi and my flash. Now the car has a Buschur Deluxe FMIC, Buschur 20G-LT, O2 housing, EBC, 780cc PTE's and a Ebay Intake. I have been doing some logging with the car and everything seemed to be very close but for some reason not really pulling on the top end. Well the visit to the track tonight confirmed my thoughts of the car being down on power but it seemed extra slow. The car ran anywhere from a 13.3@103 to a 13.5@98 on 23psi of boost. Even the car came out of the hole alot slower seeming to want to bog with a best 60 foot of 1.9 compared to the last time of 3 1.7's and a 1.64. I then splashed down my tank of less then a 1/8th of 93 octane with some C16 and loaded my old map that netted me the 12.49@109. The same thing happened, mid 13@100. I am pretty sure there is no way it could be my tune anymore but am desperate for some ideas on what would make the car so slow I really can't figure it out! Is there anyway maybe a sensor failed or something of the sort? The car idles great, drives part throttle great and no problems otherwise. Any ideas of possible problems or places to start looking? Attached is a couple logs from tonight. TIA guys!!!

 

Your tune has got to be waaaaaay off. It is impossible however to find the status of the tune with those attachments. What kind of wideband is in use? Some Widebands come with the best datalogging tools you can use.

At least try to post a .cvs EVOSCAN log so we can see what the problem is, but I did see 10.5 AFR, which is equivalent to 3/4 throttle

Below is the thread from the other day, 10.9 is too rich to make any power unless you advance the timing to darth vader levels

 

you're no longer running in the same region as before ..your loads indicate up to 300+ .. so whereever you're tuning .. you're no longer at the same columns

 

You can copy and paste the txt files into Excel, well actually I used Open office calac, then it will look like a regular log.

But yeh, it's showing mid 10s on the AFR most of the the way through, so pretty rich. But It shows an AFR of mid 11s at the start of the run, up to log entry 133 where the first gear change is made, load is still high there as well.

MB

 

Sorry about the column's being off in the text file, I just fixed it so it is easier to read.

I am seeing -1 degree of timing and high 10's in AFR at peak torque and 10 degrees at 7500 around a mid/high 10 in AFR. I can understand the AFR up top is way to rich but I can't see leaning the car 1 point netting me another 11mph in trap speed. I would think something other is to blame, or at least from end with tuning my other cars. Any opinions or am I crazy?

 

Why not try getting the AFRs right, then look at the timing you can get, I believe running a different turbo will change the timing you'll need to run. There might be another issue, but you are hitting some pretty high loads so it looks like your flowing enough air to make the power.

How are your fuel trims after adding the ebay intake? Could this intake be messing with the MAF signal and affecting the load you are seeing? Keep us updated.

MB

 

What I can see with a tank of racegas and tuning only is gaining about 100 whp from where you are at now, face it your at about 250 whp right now.

Is there a way post the airflow, if your IPW was only 13ms and the wideband was only 10.9 then your boosting about 17 psi - lol. For me to get a AFR of 10.9 at my boost levels I would need about 25ms for IPW.

Basically your car is being pushed at about 70%

 

I only had a limited amount of time in tuning the car so I really didn't get all the time needed to dial in the AFR's, that was what the track was suppose to be for. But I got caught up in trying to diagnose a physical problem with the car. I am definately going out today to lean the car out and see how it reacts.

My fuel trims are there, -1/-2. But it is interesting you bring up the intake. I have never heard of a intake messing with load readings? Is this quite common? Thanks....

 

Before you lean anything perhaps try a boost leak test.

Look at your IPW and respective AFR - THATS where the problem is , just need to find what is causing it.

Maybe MAF is screwed, how hard is it to reconfigure to stock intake with drop in?

 

I also would suggest a boost leak test. All that air that the MAF is seeing may not be making it into the engine.

 

All I can go off of is what I am datalogging. If I am logging peaks of 300 in load and I am logging 23psi with my EBC and Zeitronix (all sourced from the manifold) I don't see a problem. Honestly I have not done the math on the pulsewidth, but if I am logging 300 in load and 23psi on a seperate device and getting the A/F ratio I am I can only assume the pw is correct or what am I missing?

 

I have the stock airbox and a K&N drop in that I could throw it back on. Maybe that is what I will try right now.....

 

Alright I put the stock air box back on and did a boost leakdown test which came back fine. The car seemed to run about the same, maybe alittle better. The a/f leaned out alittle more then with the intake which seemed a bit odd. I personally don't know what to take from the air flow results from the log because I have never compared them to any others. The 21psi log never really fully hit 21psi since I didn't mess with the EBC to compensate for the change in intake and came off the 2 step. Feedback is welcome and if any would like the excel file to plug into dll I would be very appreciative. TIA everyone...

 

That 21psi log looks pretty darn fast to me, should be low 12's

 

Maybe it is just me then and the intake was the problem. What do you think of the airflow and IPW now?