250Fsprt

Hey guys just looking for a way to make my car a little faster. I know its hard to get power out of our vehicles but im looking for something to help my car feel more responsive as well. Has anyone tried installing a Apex-I air and fuel controller? Or any suggestions?

I have a 2015 Lexus IS 250 F-sport

akshunj

I used the SAFC2 on my Tacoma a few years back. Leaning the mixture out a bit I was able to net a 27hp gain at redline. Overall my peak power only went up 11hp. The factory ECU richened the mixture a lot in the higher rpms, likely to avoid detonation. I leaned it out until I saw the ECU starting to pull timing. I didn't have anything to monitor the knock sensor, so watching the timing was the best I could do.

I suspect there must be better piggyback tuners now. Check out the FTC from Underdog Racing.

250Fsprt

thank you but these seem like there only made for trucks.... Im looking to see if anyone has done this to a Lexus... I also had a Apexi controller when I had my WRX and loved it...

JB5674

I have contacted URD with regards to a product that they offer. It seems there might be some tunability for us re MAF signals etc. Its a " piggy back " if you will and they charge $200 bucks for a road tune of the unit. Im local to them, so I may invest $400 plus on the product to see if it works. At this point, I need to know where the ECU is on our cars. I have a 350 F Sport AWD in MD and located 30 mins from them. Current setup ( engine is full joeZ cat back exhaust and tekdata intake ). Im looking at PPE headers, but I dont know if I want to go that route.

akshunj

Nah it's not just for trucks. The guy who started URD was a Tacoma enthusiast back in the day working with the 5VZ and the TRD supercharger. The site may seem truck oriented, but I suspect the piggybacks work with any ECU. The FTC has more tuning points than the SAFC and does timing too. I'd email them and see what they say.

Loe

I wouldn't see how a piggyback wouldn't work w/ our ECU's, it just takes taping into the correct wires for air/fuel manipulation and to feed simulated OEM-like signals to the ECU so it doesn't think anything is wrong. I would purchase one if there was some R&D in it and HP/$ ratio is there.

250Fsprt

Thanks guys, Ours cars really need like a kick in the butt to wake them up..
Once my superdowns are installed, Im going to look into this piggy back system within the next month.

Reeladdict

Should have gotten the 350

Then supercharge it if you're not happy...

akshunj

I'm tempted to just go with a 50 or 75 shot of nitrous. Seems like the best bang for the buck and due to low power levels, engine damage shouldn't be an issue, especially with a WOT and kill switch installed.

The piggyback will give a little boost, but ultimately you are looking at about a 25hp bump max. It's nice, but likely not what you are looking for.