How many people that have 03 or 04 Cobra's that have been tuned by RWTD? I went to get my car dynoed and they told me that my car was extremely lean at WOT. I got my car dynoed three of four months ago with the same mods and tune from RWTD and the fuel to air ratio was between 11.8 and 12.1. The other place told me it was at like 14.0 how is that possible if I havent changed any of my mods without a changing my tune? It would help me out if anyone could give me some pointers.
if your maf gets dirty it can affect your A/F but usually it will go to the rich side. I have a tough time believing it was at 14.0 i would think it would detonate badly at that point and you would noticably hear it. is there any way to check it again somewhere else without a major expense.
Yeah I also have a friend that has an 03 Cobra to and he has the exact same mods and his is tuned by RWTD and he told me the same thing that you did about it detonating if it was that high the place that I got it dynoed at the stuck a copper line up the tail pipe how accurate is that??
the tail pipe meter can be very accurate depends on how long or short it is though. at the dyno we tune on it will read within a few tenths of the weld in bungs on most cars. as for the signiture you just have to past in a img hosting link into the signature box on your profile.
Team MF Member #002 Posts: 1401
Joined: 7/14/2006 From: Pittsburg, CA (BAY AREA!) Status: offline
Did RWTD tune the car and make those first dyno pulls with a fan in front of the car?
Having a fan in front of the car while making a dyno pull affects the a/f ratio a lot. It'll make your a/f ratio line look like a roller coaster. If RWTD tuned the car without a fan in front, and the other shop did use a fan, then that would be your explanation.
_____________________________
'04 Cobra Too many mods to list.. Stage IV Port, etc. 473RWHP/467RWTQ (Old Numbers) New Numbers Coming Soon Tuned by Shaun @ Advanced Engine Development
Team MF Member #002 Posts: 1401
Joined: 7/14/2006 From: Pittsburg, CA (BAY AREA!) Status: offline
Also, have you changed the position of your MAF sensor since RWTD tuned it?
If the MAF reads the incoming air at an inconsistant position (different position than where it was tuned at), the computer will add inconsistant amounts of fuel to compensate (too much or too little fuel). It's important to keep your MAF at the same position it was tuned at so that it reads the incoming air consistantly, and continues make consistant adjustments.
_____________________________
'04 Cobra Too many mods to list.. Stage IV Port, etc. 473RWHP/467RWTQ (Old Numbers) New Numbers Coming Soon Tuned by Shaun @ Advanced Engine Development
RWTD did not dyno tune my car it was a mail order tune and both times that I have had my car dynoed it did have a fan in front of the car during the pulls. I have not messed with the MAF since it has been tuned so I dont know whats the problem is?
I see that you have a 04 Cobra with a stiege blower and do you have a lower pulley kit if you do what #2,4,6 and what are your other mods?
_____________________________
2003 Satin Silver Cobra with a 2.2L Kennebell at 20 psi and a 100 wet shot
Team MF Member #002 Posts: 1401
Joined: 7/14/2006 From: Pittsburg, CA (BAY AREA!) Status: offline
If there was a fan on during both pulls and you haven't moved the position of the MAF, then I have no idea what could cause your car to go lean like that.
But taking a shot in the dark, the very last thing I could think of is if the temperatures were different during the pulls. For example, 100 degrees during the original pull, then 70 degrees during pull that made the a/f ratio go lean. The cooler temps will definitely allow more air to flow into the engine.
But even if it was cooler out, the increased airflow should've been read by your MAF sensor and more fuel should've been added to compensate. But you said your MAF sensor wasn't moved so I can't think of any other explanation that would cause it to go lean, and stay lean. I don't know what else it could be. But it's definitely something you don't want to ignore. Maybe try to get it on a different dyno and get the a/f rato rechecked. I don't know, could've been a bad reading or something.
Also, you maybe even want to consider skipping the mail order tune thing and get yourself a good dyno tune from a reputable tuner in your area. That will help minimize uncertainties and issues like these.
_____________________________
'04 Cobra Too many mods to list.. Stage IV Port, etc. 473RWHP/467RWTQ (Old Numbers) New Numbers Coming Soon Tuned by Shaun @ Advanced Engine Development
Team MF Member #002 Posts: 1401
Joined: 7/14/2006 From: Pittsburg, CA (BAY AREA!) Status: offline
BTW, about my combo.. Right now my mods are Stage IV port, 2.76 upper, Intake, mid pipe, cat back, and tune. I also have the supporting mods for the port job (SCT 2400 MAF, KB BAP, 60lb. Injectors).
Tomorrow the UPS guy will be dropping off my Centerforce DFX clutch, Fidanza aluminum flywheel, 26 Spline Input Shaft, clutch quadrant and firewall adjuster, long tubes, shorty mid pipe, heat exchanger, intercooler resevoir, LDC cooling mod, and MGW shifter. Clutch went out literally as I got off the dyno from getting the ported blower tuned. So I said **** it and decided to end the summer with a bang. I just hope I wont want a twin screw next year.
But, I also have already ordered the BilletFlow TB/Plenum, so that will be going on whenever BilletFlow is finished and ships them out. And I've decided to wait until then to add the lower pulley. I'll be going with the 2lb. lower to compliment my 2.76 upper. I just figured I'd wait to do the lower with the TB/Plenum to try and save myself a tune. When I'm done, I'll be full bolt ons with a ported blower.
Sorry to hijack your thread, but you basically asked me to... Lol.
_____________________________
'04 Cobra Too many mods to list.. Stage IV Port, etc. 473RWHP/467RWTQ (Old Numbers) New Numbers Coming Soon Tuned by Shaun @ Advanced Engine Development
When I got my car dynoed It made 467rwhp and 504rwtq my mods are 2.81 upper with Idler, stock lower, Jlt ram air intake, magnaflow catback with a gutted stock h-pipe, I t was tuned by RWTD,and me and my buddy pulled of my eaton and ported it ourselves I dont believe that it help the horsepower but IT did not lose the torqe like a stiege blower does. I am not saying that my port is better but I have heard that alot of people complaining about the torqe loss with the stiege port I guess eveyone has a different opinion!
once he adds the lower he should see the tq number come back up with the stegie port. for some reason mine didn't but most people do see it get over 500 with a port upper lower combo. I currently runa a stage 3 stegie port with a 2.93 upper and a 4# lower and am sitting at 509 rwhp 480 rwtq. I am going twin screw for sure, and also have a BF TB on order.
Team MF Member #002 Posts: 1401
Joined: 7/14/2006 From: Pittsburg, CA (BAY AREA!) Status: offline
I lost torque with my port. I lost 1ft lb. of torque. Lol. The torque loss issue on his ports were supposedly resolved with the Stage IV port design. But my numbers show otherwise, as do some others with his port jobs. But the car pulls SOO much harder. And the blower... the scream.. it's just crazy! This thing SCREAMS!
But the torque loss doesn't really matter to me, cuz like Is said, I'll have the lower as soon as BilletFlow is done with their TB's/Plenums.
But honestly I could've easily gained a few ft lbs of torque. There were other heat related issues while I was on the dyno that restrained my numbers a bit. I've been meaning to post up the results and what happened, but I haven't had that much time in front of the computer to do it. I'll post up about it soon. But for now, that's what the car put out, and those are my numbers.
My clutch and headers and all that stuff will be getting install next Friday and tuned that following Monday. So I'll have new numbers after that.
_____________________________
'04 Cobra Too many mods to list.. Stage IV Port, etc. 473RWHP/467RWTQ (Old Numbers) New Numbers Coming Soon Tuned by Shaun @ Advanced Engine Development
have fun with the lt's they sound great but they really suck to put on but let us know the new numbers man!!!
_____________________________
03'''''''' cobra vert under construction again!!! Crappy eaton cant push the boost only pushed 12psi, whipple is actually being put on right now!!! Numbers in a week!!!
Team MF Member #002 Posts: 1401
Joined: 7/14/2006 From: Pittsburg, CA (BAY AREA!) Status: offline
Lol. Thanks guys. I'm not doing the install on the long tubes and driveline parts myself, my tuner is. I hear it's not too hard, but don't want to get under there and realize that I can't finish the job or put something in wrong since it would've been my first time.
But I'll definitely post up the results.
_____________________________
'04 Cobra Too many mods to list.. Stage IV Port, etc. 473RWHP/467RWTQ (Old Numbers) New Numbers Coming Soon Tuned by Shaun @ Advanced Engine Development
Printable Version
03 Cobra Running Lean ?? - 
Lol. The torque loss issue on his ports were supposedly resolved with the Stage IV port design. But my numbers show otherwise, as do some others with his port jobs. But the car pulls SOO much harder. And the blower... the scream.. it's just crazy! This thing SCREAMS! 