If I get the JWT S/C program with 370's programmed in and and the A32 stock maf, and I start to lean out up top, what would be the best thing to do to richen it out? what which offers the most versatility to say lean or richen it out at different rpm's?

1.SAFC
2.cartech FMU
3.AEM FPR

 

You've had time to research this a bit. What have you found out?

 

well if the 370's aren't at 100% duty cycle at my however much power I am making, I can use the SAFC effectively...and that would be the easiest to use as it is entirely in cabin and quick...the cartech would take a dyno or a wideband setup to understand how to tune it and what I would be getting as a result..but would still be versatile as you can tell the cartech when to start adding FP...the FPR is only for base FP adjustment and has a 1:1 gain ratio from there on...meaning the entire FP would be adjusted up from there cause the base FP is higher....but the gain rate would be linear from there

I would need an adjustable FPR anyway since I am getting 370's, I would need to adjust my base FP just to make my car run right so that's already on the list...and with the JWT S/C program....light pinging in the lower throttle positions such as several members here are having problems with, could be taken car of my richening it out over the entire powerband using the FPR rather than a boost regulated solution such as the cartech...cause a light throttle positions, not much boost is created so the cartech wouldn't come into play and take care of knocking under light throttle....the cartech or SAFC (if I'm not at 100% duty cycle) would be good to have as well to fine tune where certain places need to be rich and certain places need to be leaner...which is prolly not the case with the JWT S/C program...if anything I will be richening it out where my mevi kicks and higher boost is achieved...!!

 

yeah, out of those three if you were to choose one the s-afc would be best. with that you can go up and down with your afr whereas with the fmu you can only take it up and with the fpr you can drop it down but that would affect the whole rev range. with the s-afc you can go up or down at pretty much any rpm you need. much finer tuning that doing it with fuel pressure.

 

just curious - what did you do with your TS ecu, sell it to an Org member?

 

haven't sold it yet...not for sale officially yet...it's gonna stay in my car as long as I am N/A cause I can't live N/A without it...it makes that much of a difference especially with my mevi!!

 

yeah but the SAFC would only work if my injectors were not at 100% duty cycle at WOT...do 370's max out with about 340whp? where do they max out and go to 100% duty cycle?

 

You might be pushing it pretty close to 100% duty cycle. It really just depends on your bsfc. If you up the fuel pressure a little bit you can drop the duty cycle a little and tune it a little better from there. More than likely you'll need an injector upgrade pretty soon though.

 

according to z specialists and such, around 380whp is about where a perfectly working 370cc injector goes to 100% duty cycle...so in my case only running 330-350whp would not max out the 370's so I could use a SAFC just fine it looks like....

 

really depends on your bsfc (brake specific fuel consumption). say for instance if you were running a 14.7:1 fuel ratio you probably would have a lot of room for the 370's but if you were running a 12.5:1 (which would be about nominal for a boosted application) you might be pushing the limit. if you're running a bit lean i'd say you have a bit of room to play with.

 

so in other words, @ about 330-350whp, get a SAFC? or stick with the cartech FMU...just in case I am maxing out my 370's cause...then the SAFC won't work in richening the AFR....

what would be the best bet to get rid of all pinging people are experiencing with the JWT S/C chip in hot weather under light throttle? bump up the base FP with an FPR? that way..the fp everywhere would be just that much higher and would take care of my lean condition up top?

many of the JWT S/C guys are seeing that when the mevi kicks in and at higher rpm=higher boost levels, things lean out to 13 or even more with the raised rev limiter...just hoping I could just use a SAFC with 370's and negate the need for a FMU...

 

To be fair, I think I am the only one with a JWT ecu that has experienced the partial throttle pinging in hot weather. At least I haven't heard anyone else mention it.

 

maybe they were a little more aggressive with your timing...or gave you the turbo program...lol

 

or maybe I should just call them and fax them a copy of iansw's dyno chart and tell them to fix a few things....you think they would actually respect my wishes...that way I wouldn't need a fmu or safc?

 

I beleive they blamed the IanS lean up top condition on his a32 MAF maxing out.
He is using a 2.87" pulley.

 

so If I were using the A32 maf with my jwt S/C program and 370's, and I was pushing for the sake of the arguement, 340whp, wouldn't my maf be at max voltage @ WOT and therefore a SAFC wouldn't work, it would only allow me to lean things out rather than richen anything...doesn't the SAFC just intercept the maf input into the ecu and change the voltage? so if I was already @ maximum, I wouldn't be able to richen anything would I?