Ronnie_W

I am assuming this would not be true for speed density. Isn't this measured with the MAF?

Ronnie_W

Is the ls2 TB a direct replacement for the ls1/6?

nkautz1

You still have to scale ifr and ve in speed density. Has to do with g/cyl exceeding 1.30, if I recall.

LS2 throttle body has 4 bolts , it won't fit on the 3 bolt manifolds.

BLOWNBLUEZ06@RKT Performance

Still true for SD. Calculated, not measured.

nkautz1

FYI , if you scale your ifr and ve , it will reduce your g/cyl and you'll need to adjust spark tables accordingly (including modifier tables like "iat vs" and "ect vs")

Ronnie_W

I'll have to try and wrap my head around what you are saying. I'm using EFILive. My C6101 table is maxed out so I'm not exceeding those values. I took my car out again today and logged a couple of pulls. Without activatiing my nitrous switch the car did great. I actvated the nitrous switch (without the bottle turned on), which in turn activates my IAT tricker circuit and it went in to REP around 5800 or so. My IAT tricker ckt puts my IAT at -6 degrees and I have it set up to pull 4 degrees of timing and add 8 % fuel at the -6 degrees. It set the P1514 code. I have twin turbos on a 347 cu in 01Z06 A4. It hits around 15 psi boost around 6000 rpms.

nkautz1

I'm pretty sure the 8% fuel increase is what's pushing you into the 1514, it will likely go away with scaling. I'd scale by 20% (multiply ifr and ve by .8) All spark tables that reference g/cyl will need to be shifted (don't multiply by .8) to reflect the new , lower g/cyl values. Of course , first make sure Engine Diag -> General -> Calc Airmass P1514 table is maxed out.

Ronnie_W

Thanks for the info. I'll see if I can make your suggestions work and if not, I'll ask for more help. Thanks again.

romandian

thats the 512 g/sec limit, right?

well, i have been told about that as well. i have a 99 pcm. in my case there is no such limit. im running well over 1.6 g/cyl now.

i went back to my non-rescaled tune, mainly because i didnt want to have to deal with all the transmission adjustments.

edit: changed 16 to 1.6 g/cyl.

Ronnie_W

I did the .8 times the complete IFR table, complete VE and Boost VE tables. I won't be able to take it for a trial run for a couple of days because of a minor surgery this morning. I'll will report back the results after a run and logging things. The results may help someone else so I do want to end this conversation with said results.

FourG63 97GST

I currently have this issue also, when holding the throttle steady before making a pull. I came across this and currently working on it.
long story short, reduce the IFR and VE accordingly

https://www.corvetteforum.com/forums...ine-power.html

https://forum.efilive.com/showthread...ighlight=p1514

Ronnie_W

I still haven't driven mine since I made the changes. I am anxious to see what happens when I do. Between the surgery and wet roads, I just haven't been able to get the car out.

Ronnie_W

Drove it and the scaling took care of the problem.

FourG63 97GST

good to know, well done.

when do you know when to stop reducing, you target a particular gram/sec. or just till it stops going into limp mode