those of you with the JWT S/C program....what is your AFR across the board at WOT and what is your timing as well?

also, what would you change to get more power out of the S/C program but still be able to use 91 octance on your S/C'er setup? I need some of this data so I can have a custom program made at technosquare...basically make the perfect program from your input on what timing and A/F you guys would want...but still be able to run on 91 octane (I live in CA...so no other option really)

ie. I know most of you state the JWT S/C program has a very good A/F tune @ something like 12.5:1 but it's timing is way to conservative...

 

JWT developed their tuning parameters based on extensive dyno testing of turbocharged 300ZXs running at much higher boost than what we Maxima owners have been running. So a timing map developed for safe operation of a 300ZX running over 20 psi will be quite conservative for Maximas running in the 10-16 psi range. I don't think it is ultra-conservative, since most of us are running the stock 10:1 compression ratio as compared to the lower CR of the 300ZX TT. Nevertheless, I very much like having the peace of mind knowing that the timing maps are not right at the hairy edge of detonation and I might burn a hole in a piston the next time I dyno or do a WOT run on the highway on a hot day.

Apparently, though, they have raised the afr from 11.5:1 in the 300ZX turbo program to 12.5:1 for the Maxima SC program. I consider this is a good thing, because power is optimized at 12.5 and starts to drop as you go lower.

My only complaint is that the afr doesn't drop to below 13:1 until after 5000 rpm, from what I've seen from my WBO2. I called JWT about this and they maintain that the afr is actually lower than that and I am seeing a higher afr because of intake charge blow-through during valve overlap. That may be true, but I adjusted the afr downward in the 3-5 krpm range with the SAFC and got a little more power.

 

how much did you get in the mid range there? and how much did you richen it? so until 5K, the AFR is higher than 13:1, then it drops from there? it's not 12.5:1 across the board till redline even from the low-end?

 

13:1 until until 5K rpms? I talked to Ben at JWT last week and they said the shoot for 11.5:1 and their turbo tune and it is the same as their SC tune. Mardi said his was 10.5:1 right out of the box with no other corrections. I do not want anyting higher than 12.5:1 at any point in my AF ratio. 11:1-11.5:1 is what I am looking for.

 

that is way, way too rich!!! I think 12.5:1 is still safe on 91 octane!...you can get away with such cause I hear the timing is so conservative!!!

has anyone on here ever data logged or graphed the timing on the S/C program? I need some kind of timing data to use when I visit technosquare...

 

11.5:1 is not way to rich in any way at all. That is a very common AF ratio that much better tuners use than Jim Wolf. For a SC set up that does not see boost till redline 12.5 is fairly safe in the lower part of the rpm band. But with my turbo I see peak boost at 4K rpms and it holds till redline. Much more power being put down much earlier with a turbo

 

I meant 10.5:1 is too rich...what mardi saw "out of the box"

 

The afr stays in the 13s till about 5000 rpm, then gradually drops to 12.5 at 5000 rpm to 5500 rpm.

I added 10% from 3000 to 4500 rpm, and 5% at 2500 rpm and at 5000. I gained about 5 lb-ft of torque from 3-5 krpm doing that.