I just want to verify that my car is tuned reasonably. AFR never goes above 13 unless I’m off throttle. Idle AFR is around 13. If I touch the throttle AFR goes between 10 and 11. I’ve attached my uprev log for my commute to work, I went wide open throttle a few times towards the end of the log. Let me know if I need to retake the log with any changes or If you need any more information from me.

The car is a 2004 G35 Coupe 6MT. I’m the original owner and it has about 150K miles on it. A couple years ago I took the engine out and had it rebuilt with 8.8:1 pistons (yes, I probably shouldn’t have lowered the compression but oh well, live and learn). 1000cc Injectors. Walbro 525lph pump with return system. Uprev GT MAF. Vortech V-3 Sci supercharger with 2.87 pulley. I’m new to this but I did all the work myself, except for the engine internals and heads. I’ve really enjoyed the car supercharged for the past few years so it’s proven to be reliable and I consider that a success even though it doesn’t make near the power I thought it was going to (it’s around 375 to the wheels with a boost pressure around 7psi). I know even less about tuning which is why I wanted to get some feedback. Any insight is appreciated. Thanks!

 

do you do any auto cross? Curious how yours temps run with a SC compared to turbos. Also, roughly how much did the engine rebuild cost? Im looking at doing something similar to mine. Did you have a local shop do it? Im not a tuner but those sound pretty good to me, Im at 13.3 WOT

 

No, I haven't done any auto cross. My temp on my commute this morning stayed around 180F (it was 80F outside). Rebuild cost was around 6K (Forged rods/pistons, ARP head bolts, etc.) It's a DE motor but they modified the block for better cooling and it uses the HR head gasket now. I had the long block done by Import Parts Pro near Houston but I don't know if they still provide the service. Thanks for the feedback on your AFR.

 

I would say that your AFR's should be 14.7 while cruising and 11.5 WOT. You are way rich at 13!

 

*lean

 

Sorry I misspoke earlier, im at 11.5 WOT. thanks for the engine info. 13 is pretty lean

 

Lean at WOT for FI but rich for anything else.
FI cars should still idle 14.7 or close to it.

 

We are talking about FI in this thread

 

OP said he's at 13 at idle. At idle 13 is rich.

 

He was responding to escobar WOT

 

I'm aware, I can read.
I don't think Big Blue was talking about Escobar, that comment was for OP.
Still stands, FI does not need to idle rich, does not need to cruise rich, only needs WOT enrichment.

 

you didnt log your STFT, you can create a map in Mglv to see if your hitting your targets, when youre not in boost youre in closed loop, bigblue is right while cruising, 14.7

 

I don't think he was, or he would've quoted him.

 

I mean 13 is lean at wot!

 

13 is RICH.

 

13 at idle is rich. 13 at WOT is lean.

 

i8acobra is exactly right; My Bad guys! Sorry I spaced out; 13 at WOT is way LEAN !!! *sitting here and picturing my guage was just the opposite of what I was thinking!