I wanted to post some information gathered from out AutoTap testing of the T-1 Intake mod, with no other mods.
First let me set the stage with definitions and basic information.
Closed Loop: Closed loop is the feedback loop relaying constant real time oxygen sensor information to the Power Control Module (PCM) letting the computer know that it senses that too much oxygen is being seen in the exhaust or too much fuel is left over after combustion. The PCM automatically adds or deletes fuel injector pulse width shown in the Short Term Fuel Trims to bring the combustion instantly back to 14.6:1. In this way, no matter what amount of new air seen by the 02 sensors, the fuel injectors automatically correct the closed loop cells.
Open Loop: This is wide open throttle and fuel enrichment startup mode, up to a coolant temp, with factory settings that do not receive oxygen sensor data for their settings. The closed loop Long Term Trims do have an effect on these tables however. More on this later.
Long Term Trims: This is the average of the short term fuel cell corrections made. The T-1 intake, with no other mods, brings the Long Term Fuel Trims up from the approximate zero baseline to between +15% to +20%. This simply means that between 15-20% more fuel has been added to the partial throttle positions to bring them back to 14.6:1. IT DOES NOT MEAN THAT YOUR CAR IS RUNNING LEAN. The PCM has a threshold for new unexpected oxygen. i.e. If 23% more fuel trim has been added to any one of the 19 trims for more than 6 seconds, a MIL code will show on the DIC.
Fuel Cells: There are 19 stoichiometric seeking fuel cells associated with partial throttle positions in the C5 PCM. In other words, from idle to all throttle positions except Wide Open Throttle (Fuel Cell 22) the computer will ALWAYS return the air fuel ratio to 14.6:1.
Lean Codes, Bank 1, Bank 2, or both: A lean code will occur, when the Long Term Trims (LTFs) have seen 23% added fuel pulse width to any fuel cell to keep the cell at 14.6:1. Does this mean you are running lean? Yes and no. It just means that the 02 sensors have seen new air, and have added pulse width to the injectors, on average, in one or more fuel cells, beyond the factory threshold of 23%. It is similar to installing your smoke detector too close to the oven.
Rich Codes: Rare but they can happen. The computer has much less tolerance for unexpected fuel left over from the combustion process, for obvious reasons. The conditions that could cause this are injectors that are too large for the amount of airflow. I have seen this code once with our 310cc/min injectors, since they bring the LTFs down from +15% to +20% to around -3% to -5%. If any fuel cell sees -10% the rich code pops. We eliminated this by dialing 2% of the fuel trim back with the AFR.
Why are the LTFs important? Besides having informational value to technicians, they have an effect on OL-2 (Open Loop 2) WOT fuel cell 22. When you enter into wide open throttle, the factory fuel tables are set for the best power throughout the rpm range. The tables start around 13:1, then more fuel is added around 4500 rpm, then it backs off again at redline. I cannot reveal our findings here for obvious reasons. The computer then adds or deletes fuel based on the "snapshot" it sees in the last fuel trim you were in before flooring it. If your fuel trims are on the + side, additional fuel is added to WOT. The opposite if the LT Trims are on the minus side.
The Halltech T-1 package has been tested and dynoed for over 5 months to determine the proper a/f ratios and we have it dialed in. With no other changes, except our ported throttle body and the AFR, we went from 16.2 additional RWHP with just the T-1 to over 30 RWHP. Most of the gain came from the proper LT fuel trims. This is exactly what the programmers try to solve.
Solutions:
Lean codes: Can be solved generally by retricting airflow slightly. Our Z1000 Race filter allows more air than any other filter on the market, Period. We have a street version of this filter which has cotton media (more restrictive) than our synthetic media, and this will solve any lean codes permanently. When you order your T-1 you can specify this filter if you like, or order both. Our Race filter is the filter used for our 381.2 RWHP pull (448 HP).
The AFR Calibrator solves all LTF problems permanently, but its cost is high. $499.00. The Magic Box also solves the problem for $199.00. Both have to be hardwired, but that takes around 30 minutes.
The MAF Translator sold by RG at Exit 28, ( Supporting Vendor) will also solve lean codes and runs $179.00 I think. RG?
Larger 270cc or 310cc fuel injectors will solve the lean codes permanently. We sell the RC blueprinted and balanced injectors. There are cheaper injectors on the market. Ours are all stainless steel inerts and have been balanced to tolerances beyond any others on the market. $685.00 per set of 8.
The bottom line: If you have the same goals as Halltech, you will find that our testing methods, honesty and reliablility are without equal. We also post all of our findings. If you think you can make more than 30.2 RWHP with your combinations, go for it. We know we can and have 3 "Doubting Thomas'" that will be installing the full T-1 Package.
We will lay it on the line for all to see. These guys will be the witnesses.
Jim, could you please explain this question in laymens terms. Very basic. I have a 2002 Z06 stock. I put your T-1 sidewinder on. Am I going to have lean or rich issues. Where I live, we don't have any real Corvette tuners to work these problems out. This is one of the reasons I bought your system. I was lead to believe that it was plug and play so to speak. Bolt it on and enjoy. Put her on and drive her!!!! etc.
Thanks
Originally posted by 2002blackZ06 Jim, could you please explain this question in laymens terms. Very basic. I have a 2002 Z06 stock. I put your T-1 sidewinder on. Am I going to have lean or rich issues. Where I live, we don't have any real Corvette tuners to work these problems out. This is one of the reasons I bought your system. I was lead to believe that it was plug and play so to speak. Bolt it on and enjoy. Put her on and drive her!!!! etc.
Thanks
We have over 100 T-1 Intakes sold, with maybe three that have reported the code. It can be reset from the driver's seat in 1 minute, and so far they have not returned.
You should have the same 16 RWHP we got, with no other changes to your Z06. We never saw a lean code, and have only heard of two customers getting them. The idle relearn process described in our instructions, usually solves the code problem since that procedure resets the butterfly position of the throttle body.
You will never see a rich code, but if you do, it will not be the result of our T-1 intake.
All of the other mods we have added were intended to maximize the performance of our intake.
GM took the screen out of the MAF this year. That one event is the culprit behind all of these issues with the aftermarket.
We NEVER heard of one code last year with our TRIC and the 01s, unless someone decided to pop out the laminar screen in the stock MAF or go to the Granatelli unit.
The workaround is simple in its application, and my question to you is, have you gotten a code? It will occur within the first 50 miles if at all. If not, don't worry about it. This post is to explain everthing we have learned about the 2002 trims.
I cannot reveal our findings here for obvious reasons.
Heheheheh....some conflicting info here.
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If you think you can make more than 30.2 RWHP with your combinations, go for it.
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There are cheaper injectors on the market.
Thanks for advice Jim. I recently posted a question asking for the latest poop on correcting WOT fuel trims, but received no replies. I think I can see the info I need between the lines however. It appears that one might do OK with:
Donaldson Blackwing.................$249
Ford Motorsport 30# injectors....$210
MAF translator........................$179
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total......................................not bad
In all seriousness, though, thanks Jim for the aftermarket support. I love your products even though they are a little pricey for me. Keep up the good work.
Jim, thanks for the clarification. I am resting easier. No, I have got no codes, but then again my car is sitting six feet above ground on my 4 post lift because it is the middle of winter up here in the Great White North . When i do finally bring it out in the spring, I will watch for those codes. I have full confidence in your product..........and it's perty lookin too!!!!!!
I cannot reveal our findings here for obvious reasons????
Why "I cannot reveal our findings here for obvious reasons"? It's not obvious to me. What's so secret about your results? The algorithm adding fuel at WOT is GM's, not yours.
Re: I cannot reveal our findings here for obvious reasons????
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Originally posted by JimGreen Why "I cannot reveal our findings here for obvious reasons"? It's not obvious to me. What's so secret about your results? The algorithm adding fuel at WOT is GM's, not yours.
Please explain this. This is a no BS zone.
When we do extensive research on the Z06, we do post all of our pertainent findings as they relate to the forum.
The exact a/f ratio under WOT for making the 30.2 RWHP is something we do not share.
The GM fuel tables in my PCM belong to me, since I paid for the car. I understand that GM developed the code. Halltech developed the solution to extracting even more horsepower from an awesome car.
Re: Re: I cannot reveal our findings here for obvious reasons????
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Originally posted by Halltech The exact a/f ratio under WOT for making the 30.2 RWHP is something we do not share.Jim
So Jim, If we buy your system for that 30 hp, how are we supposed to dial it in? Are the proper trims already plugged in to the MAF translator? Is there something we have to adjust and do you give us the settings? Or can we only get the 30 hp if it is installed by you?
Okay, if I purchase the "reduced price" T-1 package with the 30lb injectors, will I possibly experience "rich" codes ? You said in an earlier post that the new injectors need to be installed by a professional, does he need to be a Z06 tuner?
Just trying to get all the info. before I purchase.
There are better ways to tune without knowing target A/F ratios. Starting from a rich condition you can determine the best power MAFT settings on the dyno while looking at the spark plugs with a 25 power magnifing glass. Find the highest HP curve that doesn't show any distress (metalic microballs) on a fresh plug and then richen 1 click.
O2 readings vary between sensors. Therfore PCM A/F ratios will vary.
Raw O2 data can also be helpful. Notice the values in the area of peak torque are leaner (O2 = 890 mV) than the values near peak HP (O2 = 895 mV). I don't know that I have ever hurt a motor by running it lean through peak torque when core tempeature is still low. But I know you will do damage if you don't have enough fuel in at peak HP. I've done that trick too often while trying to find more power at the track and on the dyno.
Last edited by Roger Ramjet : 01-22-2002 at 03:35 PM.
Jim Hall, you said:
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When we do extensive research on the Z06, we do post all of our pertainent findings as they relate to the forum.
The exact a/f ratio under WOT for making the 30.2 RWHP is something we do not share.
The GM fuel tables in my PCM belong to me, since I paid for the car. I understand that GM developed the code. Halltech developed the solution to extracting even more horsepower from an awesome car.
Hope this makes sense.
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It doesn't make any sense at all. (Actually, it sounds to me like BS.)
Like all software, you do not "own" the GM fuel tables in your PCM, or any of the code. (BTW, PCM stand for "Powertrain Control Module", not "Power Control Module".) When you bought the Z06, GM gave you a *license to use* the software. They retained ownership of the software. Try to sell the PCM software and see how fast the GM lawyers are all over you.
Also, it's no secret what AFR is needed to make maximum power. Look at all the posts on the forums at <www.teamzr1.com>.
You don't have any secrets. One makes some mods, then adjusts the MAFT until the LTFTs are at or near zero, or maybe a little negative. That allows spark advance to reach the maximum and make the most power.
All this sounds to me like you are trying to bamboozle the readers of this forum with double-talk, making them think you have some "secret" HP to sell. Tell me it's not so. Come clean.
Originally posted by JimGreen Jim Hall, you said:
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All this sounds to me like you are trying to bamboozle the readers of this forum with double-talk, making them think you have some "secret" HP to sell. Tell me it's not so. Come clean.
If he makes the HP he claims, then I see no BS. He is willing to back it up. Sounds to me like you have personal problems with Jim. Please take it to e-mail.
I have no "personal problems" with Jim. I have never met him, but from reading many of his posts, he seems like a *very nice* fellow who I would like to meet. I even own one of his intake mods, the TRIC/Cobra, and am very happy with it.
I also do not question his claims for HP. He seems to be up front in posting dyno results.
What I did question was the "I have a secret". There is nothing secret about all this stuff. It's published all over the web. Saying that "I have a secret that makes X more HP" is BS.
Jim makes some very nice mods that undoubtedly produce more HP, but the HP is *in the mods*, not in some "secret". I pointed out that GM retained ownership of the PCM code and invited him to come clean on this "secret".
Do you disagree with my reasoning or facts? Which?
Just as a related but possibly interesting tidbit of information. I have popped two MILs so far - both in very cold dry air under "aggressive driving"conditions. Did the reset and all was fine. Once I go the headers route (stay tuned - new developments breaking) I may need to consider MAFT tuning or possibly injector upgrades. My intake mods are in my sig.
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'08 Atomic Orange Z06 with 3 LZ Sienna Wrap Interior, Nav, and Chromies. M2W, Halltech Killer Bee, Air Charger, 180 degree thermo, Body Colored Spoiler, More Mods coming
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In all seriousness, though, thanks Jim for the aftermarket support. I love your products even though they are a little pricey for me. Keep up the good work.
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