The chip is an XS chip, similar to M2 stage 3 or pettit, tuned for stock port motor, full bolt on, and 14.7lbs max.

My mods: intake, downpipe, hollow main cat, 3" catback, non-seq.

Boost on this run was 12lbs.



After this run, I swapped back to the stock ecu, turned the boost down to 8-9lbs, and dynoed 250hp/243tq. Almost 4lbs of boost difference, and only 10hp. I dont know what is making my car run so bad with the chip. I posted this in the dyno section too, but theres not as much traffic there, and this is more of a tech question anyways.

 

try changing the plugs. 9's all around would be good since you had a decent amount of mods.

 

Have you tried calling/contacting XS and talking to them about their ECU?

 

Full bolt on may include intercooler upgrade. You don't have one. It might be running different a/f because of that.

 

Do you have the graph of the stock ECU runs, both hp/torge and RPM/AFR?

Maybe we can see the difference from the AFR.

 

Sure, I'll post up my stock runs. I only have a print-out of 3 stock runs, and this crap run on the same page. Its kinda hard to read, but you guys can take a look.

Also, I'm already running 9s all around, I changed them out about 3000 miles ago. I havnt checked to see how they are doing, but on the stock ECU, they appear to be running fine.

I didnt purchase the chip from XS, so I was hesitant to call and ask them. But looking at my stock ecu AFR compared to my chip AFR...the stock ECU is just as rich on a few of the runs. It was getting leaner as I ran, possibly due to heatsoak? But the first run after I switched back to the stock ECU, I flatlined on 10 a/f, because the graph didnt read any lower.

 

Stock ecu runs.....you can see the bad run in there, and the AFR at the bottom. The other blue line was my next run, labeled at the top as RunFile_375.drf. This run my AFR was pegged at 10 from 5500 - 7200. It peaked at 251hp, but quite a bit less torque (I think it was around 235, but it got cut off and I dont remember it).

 

Look at the blue AFR compare to green/red AFR line. Looks like the XS ECU is too rich.

 

One of the blue AFR lines is also from the stock ECU run. It is hard to see, but you can see along the bottom from 5500-7200 where it runs flat on 10, it makes the border dissappear. That is with the stock ECU, it was richer with no cutting out missing problems. You can see where it comes back into the AFR plot at 7200 and continues toward 11AFR till i shut down at 7800.

The AFR from the XS ecu is the blue line on the top in the AFR plot, and chops up and stops at around 7000rpm.

 

i will tell you the problem. xs does an absolutely horrible job with their maps. your car is not tuned for your mods even with that chip. get a power fc. sell that POS and have a REAL tuner do the work.

their horse **** maps cost me my motor...and my 1300 dollar ianetti ceramic apex seals. their timing maps were trash...and their fuel maps were a MESS.

Lamers. how many engines need to be lost because of their **** tuning?


Jason

 

you trusted 1300 apex seals to a 400 ecu? WOW

 

Their tuning was done on his (artguy) Power FC if I remember correctly.

The chipped ECUs are always super rich to maintain a margin of safety so I guess its starting to affect your performance.

 

yes, iirc they even tuned artguy's PFC ON his car (as you would expect but i take it they do some mail tuning)on their dyno.

 

Same thing is happening to me with my FD...i have a Pettit chip...

 

Man, the air/fuel ratio for the XS chip looks horrid!

That thing is incredibly lean before 5000 rpm. This isn't the first horror story I've heard about their ECU's. I almost got one and called them and they basically told me that it was not a supported product any more and that no help was available.

The stock ECU is rich, but at least the air/fuel curve is somewhat flat. Even if you richened up the XS setup (below 5000 rpm) by increasing the fuel pressure or injector size, it will be super rich up top.

An SAFC would help you out, but it opens a whole different can of worms.

Time to sell that puppy and get a standalone or an ECU tuned specifically for your car.

Sonny

 

the air fuels on my dyno tuned power fc they did look terrrrrrible too. so terrible my bank account now looks terrible because i had to GET A NEW ENGINE BUILT.

Thanks xs. How about I post those maps sometime...hell, I will even post your top secret timing maps (in other words HALF ASSED).

cheers


J

 

With the possible exception of M2, all the upgraded ECU's are pretty much the same thing (mine is Superchips). The PROM is removed and read by their computer (or whatever company that does it for them), the maps are changed from economy to high performance. So if you originaly ran 87 octane, you now have to run 91. The new mapping is burned on a new EPROM and soldered in (which is why you have to send in your ECU). The fule cut is raised to one bar except for the Pettit unlimited which has no fuel cut which is a oxymoron (so to speak) because the fuel system maxes out at 1 bar. If you use a seperate fuel computer it will overide the fuel cut anyhow. I don't think XS made their own chips because of equipment costs.

 

the problem isnt with the chips...the problem is with the horseshit careless tuning they do.

when i go pick up my car next week i will get printouts of their maps to post for everyone to see how they fukk people over.

 

Tell us how you REALLY feel Artguy!@

 

I'm starting to see a pattern here on the preprogrammed ECUs - FDs with these ECUs and street port (including mine) usually fall on their face after 6.5k RPM. So its either a flow problem OR the mixture is too rich OR the spark is not strong enough (improving the latter with some HKS TP would probbably fix the 2nd cause also I think).

Any other opinions on this ?