kinda basic question??? Grady maybe

[blksn955.o]

FINALY, I have the 94 back up and together...got the last PITA issue fixed (alt. was not getting a ground threw all the powdercoat).

I have a question about the J4J1 speed limits. When I set up my speed limits I did the 16xxx thing and have been looking at some of the what seems to be "newer" info. Is this the correct way to kill the speed limits on our processor?

Last year I was having an issue with my J4J1 tune at the track, with a VERY basic T4M0 tune with only the inj. changed for the 24's very basic with the 24 and 24 x's 1.2 for slopes and checksum set to 0. I picked up like 3 tenths and 3mph with the 100% stock timing tables and 10* base.

Now I know I had some valvetrain issues that I sorted out. However, I have been thinking the speed limit kill info thing was kinda old and might have more for the fox stuff and not the same for our 94-95's. Picking up so much from such a basic file has me thinking I have mine setup wrong as the drivability is great but WOT perf. was soft.

Nothing else I had messed with on the J4J1 should have caused this other than what I found out about the breakpoint/slope being a mix of J4J1 and T4M0 issue that I think had the major roll...just want to make sure its not the speed limit as well.

Sorry for the long read...and thanks.

 

[final5-0]

j4j1 speed limit

I don't even have a clue about what you are talking about

Is what you speak of a scalar, function, or what

You're gonna have to elaborate ... just a bit

Grady

 

[blksn955.o]

sorry, scaler

speed limit stage 1off
speed limit stage 1 on

speed limit stage 2 on

speed limit stage 3

WOW, maybe this also is a miss-communication then...if you dont know what the speed limits are on the j4j1 maybe its something to just not mess with? I am going to run a log tomarrow morn and see whats up with the rough tune I have now...might make a quick change and remove the speed limits then.

 

[final5-0]

OK ... OK

The word "speed" kinda caught me off guard

If I'm on the same page as you .............................

That stuff is part of the rev limiter

Yes ... No

Grady

 

[final5-0]

I did a little checking between my current file and an original unmolested j4j1 file.

Before I give you the info I will say I had a little leg up way back in the day when I first got into all this stuff.

Mike Glover gave several of us 94-95 peeps a file he had been playing around with on his wifes 94-95 Stang.

I took that file and returned a good bit of that stuff back to original values as I saw a thread on yahoo by him where he said some of the mods on that file were done by others before he got the file.

What mods to the file I left in place were only those I could document as being proven knowns. At that time ... so much misinformation was being passed around ... you really had to be careful back then.

The rev limit and this speed limit you speak of are among those mods I left in place so I've never paid attention to them since then. All my old data from back then was lost on a laptop that took a dump so I have no more info to add other than these values.

anyway ...... maybe this can be of some help to you

Here is what I saw differnet from an original j4j1 file and my current file.

original j4j1

speed limit stage 1 off 3250
speed limit stage 1 on 3300
speed limit stage 2 off 16384
speed limit stage 2 on 16384
speed limit stage 3 16384

my current file

speed limit stage 1 off 16383
speed limit stage 1 on 16383
speed limit stage 2 off 16384
speed limit stage 2 on 16384
speed limit stage 3 16384

Grady

 

[blksn955.o]

Mine are all the same at 16384, I will change it to match your current one and see if it helps.

Thanks as always .

 

[final5-0]

I read you original post over a few times and it seems you are looking for more power up top.

How does your fuel ratio and spark curve look for wot conditions

After all ... WOT tuning is a piece o cake compared to CL stuff...

Its not a lot more than a decent amount of fuel & spark

Grady

 

[blksn955.o]

31* at 2000rpm and from 4000-5000 its at 30* in both top two rows in the base and alt. table (useing both)

Fuel is set to 12.901 or 12.89 (commanded 12.8 but it reverted to 12.9).

I really have not messed with it yet...will for sure tonight. Preatty sure the issue was the breakpoint and slope was a mix of t4mo and j4j1 style (j4j1 breakpoint and t4m0 diff. slope) THat is fixed with a t4m0 breakpoint and slope style.

Just want to make sure, as the info I got the speed limit stuff from was quite old and like you posted didnt want to run into another fox setup or wrong info thing.

 

[final5-0]

Don't know how good of gasoline you can get around where you live
and
I know you got iron heads and all
but
When I was runnin my self ported E7 combo ...................

I got the best performance with 36 degrees total
and
I was runnin 93 grade gas

Have you tried more spark

Also ... were those fuel values commanded
or
values from a wb?

Grady

 

[blksn955.o]

No wideband yet . The biggest reason I have the timing on the lower side. I have 93 avail. at 90% of the stations around...then QT (local-ish chain) just dumped there prem. to 91 (but I only get there gas as a last resort). I smoothed out my chambers so that should help fight off the det. also. Depending on the production var. of +/- 2cc on the heads and the smoothing I am around 10.33 and 10.66 to one on compression...so I deff. want to keep it lower until I double check the A/F. On the old stock maf it was dead on from the dyno session...diff. stock maf now so who knows...I think I may be the only person running a 98 GT maf on a 94 GT.

I REALLY REALLY want to get a WB to double check things...I am not going to say anything but hope things go as planed this time...yeah right .

Was going to log some tonight while I had it out...started raining and the wife and I just went to dinner and a movie instead we were going to have dinner and go hang with our own friends for the night...good date night .

Drove it at least 50-60 miles and well over 1hr. Not one single issue...even got into a little scuffle with a WS6...he didnt catch me on the hwy on the top side...but there was traffic in the other 2 lanes so I am not claming anything. It did good though at WOT in the 4th and 5th gear (before rain started BTW). Got cought at at least 20 lights and not once did it surge or bobble at idle, no bucking or surging at part throt. or mid load either.

Only thing I can complain about is I NEED to do some susp. work...thinking about selling my SSM bars for something more mild. Had ALOT of fun and doing what I missed the most just having fun with it.

 

[final5-0]

It is wise to have caution about looking for the last bit of power with fuel/spark table manipulation without a wb.

Another thing to think about is running that mod motor maf most likely has changed things
Not that there is anything wrong with using that maf.
You just have to dial in the OL part of ANY different maf when talking about wot max power.

Of course you can use the K's to dial in CL but that is not the focus of this thread.

Not very accurate but you can add more spark a couple at a time and listen for the ping thing.

I do think if you have plenty of fuel you could pick up more wot power with more spark.

Bottom line is ... you wanna be SURE of a ratio that is not TOO lean when you start to find the optimum final wot spark value.

Grady

 

[Methodical]

Hey Black what's up. I have my speed limiters all set to 16xxxxx. Something I will also toss out here, and Grady correct me if wrong, you may want to address the Fuel Enrichment function - I think is Fuel Enrichment for WOT. The J4J1 enriches the fuel up top to, from what I understand, slow you down. I would have to look at my tune to see what I did to eliminate it. What you think Grady?

 

[blksn955.o]

I agree 110% grady I NEED A WB...I have saved up the money 3x's over the summer...just ended up having 8 (yes 8) weddings to go to I was in 2 and had 3 bach. parties...then the 10 day vac. we took to NC in the middle of that. Really ate up the budget for the WB. I do not want to guess and will do the check K's thing on the CL for the non-WOT areas...but yes to those who are watching/reading GET A WB. I may just duck out and at least go to a dyno for a pull or two to check at least until I get one...hope its not that long though.


The info on the "Fuel Enrichment for WOT" would be great Methodical, I never messed with that so its stock in that regard. I do know its diff. than the gt tune.

Thanks, guys.

 

[final5-0]

Hey Black what's up. I have my speed limiters all set to 16xxxxx. Something I will also toss out here, and Grady correct me if wrong, you may want to address the Fuel Enrichment function - I think is Fuel Enrichment for WOT. The J4J1 enriches the fuel up top to, from what I understand, slow you down. I would have to look at my tune to see what I did to eliminate it. What you think Grady?

Yes Sir

That function will REALLY hose up what you are trying to do when setting your final ratio.

IIRC it starts at 90mph on GT files and 120mph on the GT flavor.

The first time I dialed in my ratio I had been working from the portion of the maf curve where you got the CL/OL break point to about 80mph. My focus was there as that was about the max amount of speed I could deal with where I was doing my wot dlog blasts in third gear.

When I started to work on the last part of the curve, I had moved to a more suitable place for higher speed.

When I saw things suddenly go fat ................

I was like

What caused this to happen????????

After I found that function ... I promptly killed it

Grady

 

[blksn955.o]

Yes Sir



IIRC it starts at 90mph on GT files and 120mph on the GT flavor.


After I found that function ... I promptly killed it

Grady

typo or is there 2 for the gt file? what one is the cobra mph?

and

how do you go about killing it?

 

[final5-0]

typo or is there 2 for the gt file? what one is the cobra mph?

and

how do you go about killing it?

Sorry bout that

I was in a hurry as I had to be somewhere and did not take the time to see if it made sense.

Should have been Cobra for the lower speed.

You just match the same lower mph values at 90 and above.

The values are a multiplier kinda thing.

I lost some good notes a while back so other than remembering to NOT use a value of 1.00 and use the same lower values for all the function, I can't offer more info other than that.

Well I guess I can positively say the function does add a good bit of fuel and when you match the numbers for 90 and above, the additional fuel goes away.

Grady