hey guys, diablo cannot seem to get the code right to remove my top speed limiter. i have recently added the procharger and diablo has done a great job of nailing down the tune for me. only thing is they cant seem to remove the top speed limiter. its killing me. a blower's no good unless you can go faster than 98. i cant even go to the dyno to get #'s until the limiter is gone and i surely can't go to the track.

FYI, my truck is a 97 4.6L. on 97-98's the speedometer is controlled by a VSS gear in the transmission. it can't be corrected on the chip so this is not the problem. i have the correct gear in to correct the speedometer. i used to have a superchip and it removed the limiter. if superchips knows the code, why doesnt diablo?



are there any other YSL2 owners out there who have a diablo and the speed limiter is removed?

 

i had same problem woth diablo on my 03- lga 2- so much more powerful with the chip the 1st time raised my speed limiter from stock- 4000 rpms in drive, to 4300 rpms in drive- sent back- 4600 rpms in drive- i'm going with a superchips custom 3 program tuner from mike troyer- appears there more than 1 parameter to limit top speed- diablo can't crack em- mike can-phil

 

Hi Bullet,

It is unacceptable for any competent Ford tuner to not be able to knock out all of the functions that implement the TS limiters in that 1997 YSL2-code 4.6 automatic F-150. But you already know that..................

YSL2-type codes do have numerous aspects (multiple functions) that make up the TS limiters, so it takes someone with good knowledge & experience on those codes to do this correctly - but it is a 1997, so that should not be a problem for any decent Ford tuner.

And by the way - unless the chipmaker was brought in by the supercharger manufacturer to do the tuning R&D for them (like most supercharger manufacturers have had Superchips do for them) and that exact configuration is being used with a stock factory MAF, tuning a supercharged engine *properly* cannot be done without full-throttle engine operational data throughout the entire rpm range - and even then, full dyno data still needs to be obtained and the tuning thoroughly reviewed based on that data, as there are *always* numerous adjustments & fine tuning that can (and should) be done to really nail the tuning. With proper datalogging equipment & knowledge, there are even ways to do that without the vehicle actually being on a chassis dyno, though the dyno is always preferable.

Datalog not only the A/F's, but also Engine RPM, Engine Coolant Temperature, Air Charge Temperature, Short Term Fuel Trims (both banks), Long Term Fuel Trims (both banks), upstream O2 sensor voltages, Calculated Load, MAF Voltage/AD Counts, Closed Loop Status, Spark Advance & vehicle speed - so the tuner actually *knows* exactly what the engine is actually doing everywhere, and can tune it accordingly - just FYI.

Since they can't seem to get the TS limiter off for you, you can get around that easily - just do a run on the dyno in 2nd gear of your 4R70W automatic transmission. Then you can at least get WOT data throughout the rpm range without it downshifting or upshifting. Just put it in "2," take it up to about 1500 rpm and then nail the throttle and run it at full-throttle until the power falls off or until you hit the rev limiter - whichever comes *first*. In other words, don't continue to run the motor all the way to the rev limiter when the power is already falling off - and that's generally what will happen. The power will usually peak at about 5100 rpm if that engine is breathing properly on both the intake & the exhaust side. If it's not breathing well, the power could peak as early as 4800 rpm. And the first load rev limiter is 5500 rpm in the stock factory tune, so your power will definitely peak before you hit the rev limiter.

You're not the first to report that exact same problem with Diablo chips here - they can't remove the TS limiters in any number of these F-150's, just as others have posted here - like openclasspro (Phil) with his 2003 LGA-series code 5.4 F-150, for example, just a couple weeks ago he posted the same problem on his truck - and that's an easier code than the YSL2 to do that on. So it's not just your 1997 truck.

Your YSL2 code is easy for us to remove the TS limiters in - I'm looking at that YSL2 code right now, and that isn't a problem as long as you know what you're doing - but if you don't, then YSL2 can be a real problem, as it's TS limiter is actually numerous different functions, and has numerous different stages to it as well - so it has to be done by someone experienced with YSL2-types of codes.

This is one of many reasons why we specialize in F-150 tuning, as you have to in order to do a world-class job tuning all F-150's regardless of what code, what engine, what model year, etc.
These F-150's generally require more R&D than most other vehicles as they have more different PCM codes and do things in so many different ways than just about any other vehicle made - so they require a lot of R&D to really be good at tuning them properly.

One quick thought, and a very obvious one you may have already done - have you actually talked directly with Diablo about this to get a response directly from the manufacturer? If you haven't, you should do that right away, as many times we've seen problems with Diablo chips reported here that they just needed to know about at the manufacturer, they got it taken care of - I don't know if that will work in your case, but it's certainly worth a try if you haven't spoken directly with them.

If they can't get this taken care of for you, then you should return the chip and have us do a custom tuned 4-bank Superchip (or one of our custom tuned 3-program Micro Tuners). We can give you a world-class custom tune that *will* remove that TS limiter, so you can take that truck up to the 145 mph + that it should easily be capable of with a supercharger. We've tuned hundreds of aftermarket-supercharged F-150's.

Don't let it get you down - worst case, you know we have the solution available, so there *is* light at the end of the tunnel if Diablo can't get this taken care of for you - but give them a chance by talking directly to the manufacturer if you haven't done so already.

Good luck!

 

my buddy rusty (mclean) who is burning the chips for me, has spoken to diablo several times and we have tried about 4 different burns. each time they will say they think they have it removed, but it hasnt yet. i know there are like 100 pages of code and they have to guess to get it right, but crap, superchips did it, diablo should be able to also.

here's the reasons why i went with diablo. i had a superchip before. it worked great. i got the diablo because i could get it from rusty. i mean he can have me another chip burned in 2 minutes. he keeps all my files on his laptop and can take them to to the track with me to experiment with different programs. plus he cut me a deal. strictly for ease of refinement to the programs and financial reasons. i mean, the diablo has everything right! the tune is perfect. we nailed a 11.5:1 first time! only thing holding us back now is this TS limiter. ARRG!! CUSS WORD!

i think rusty is gonna try and talk with them again about it. hopefully something will happen soon. i'm a few hundred bucks in and would like to keep the diablo and not sink another few hundred into a superchip which i would have to send off for reburns and have the truck down for weeks at the time.

 

mine runs so strong with the diablo- but i'd like to dyno it to redline in drive- i'm hoping the microtuner custom tuner i get will be as strong as the diablo chip i had- as i drove in identical truck as mine same mods except for 1715 tuner as compared to my diablo chip[same mods,same lga2 code, the tuner wasn't as strong performance wise as my diablo- if mke can make mine run with his custom tuner as strong as my diablo and remove limiter- i'll be one happy customer-phil

 

Hi Bullitt,

It's always nice to be able to work with a friend - you'll just have to deal with the 98 mph limiter until Diablo gets it figured out.

While it's easy for *us* to do that on the YSL2 code, for those chipmakers or companies that have not done significant R&D on this platform and specifically that style of code, the YSL2 code is not an easy one to figure out. It has multiple aspects & stages.
In many cases what can happen is you get one or a couple or even a few nailed, and so the truck goes a little bit faster (like in Phil's case), but it's still being limited until *ALL* of them are found.

Just keep working at it & eventually they'll get it taken care of for you.

Best of luck with this, & have fun with your truck!