Can the OP update us on this thread? Did you talk to your tuner about upping the boost? What did he say?

 

If the AFR's were from a tailpipe sniffer these might not be *that* lean... not sure if this was mentioned but I didn't see anyone say something :P Let us know.

 

His car is still pulling timing. I know for a fact in this weather that we were having HOT + Humid = More fuel. I have to run my car @ 10.9 - 11.0 to get it to stay in the High Octane map.

Hey News if you want we can meet up and evoscan your car to find out whats going on timing and knock wise.

 

Actually at first you said raise the boost and the afr will drop because that is what you noticed on your car.

 

What I found in my testing is more boost leans out your AFR in the higher rpms.

https://www.evolutionm.net/forums/sh...6&postcount=72

 

Testing on my EVO revealed that tailpipe AFRs are about 0.3-0.4 leaner than AFRs taken at the downpipe.

 

That's the same for all of us at least when testing on Dynojets - almost half a point leaner sometimes at the tailpipe.

However, last time I spent 2 hours on the dyno self-tuning my boost and AFRs so that I could be legal in SCCA (no alky while being tuned for alky), and when I'd lower my boost several psi, the whole AFR curve would drop yet stay the same shape. When I'd raise it up, the AFR curve would rise. I don't know why that is, but it was repeatable and verifiable.

 

There were back to back posts with no other posts in between. I did some more analysis and commented on his strange HP curve and how it looked like timing being pulled - that's when I said to add a little fuel along with more boost.

 

Wow. Back from the dead I see. I did speak to the tuner about why my boost was set low. He mentioned a preference for the conservative but was weird and evasive about elaboration. That's a warning sign in my book. I'm gathering together a second round of mods to complement my Turbotrix tune in two weeks. I've been emailing them about my issue and let's just say we see eye to eye. I just got a tester together to check for any boost leaks today. I will definitely handle that aspect before my next tune. My compression test yielded 178-181PSI across the board. My biggest dilemma right now is whether or not to get alky. Researching...




PS
Thanks guys. I sincerely appreciate the effort/posts

 

Yea that is what I always have noticed also, when at the dyno, I have never seen boost make a car run richer, that is why in over boost conditions if not careful your engine will experience the BIG BANG THEORY

 

looking at your AFR it about 11.7-12. now that isn't conservative if you ask me for 93 octane. but like Warrtalon mention about measuring of the AFR at the tailpipe will show lean. the real question is was your AFR sensor at the tail pipe or DP ?? i have seen Dynojet dyno with both. On the other hand your powerband graph is ****ty and also your SMOOTHING already at 5.

 

If the tuner was evasive and not credible, then go with Turbo Trix as you have indicated. That is a wise choice. I hope you did not pay him a lot of money to tune your car. Keep us informed about the results from your tune with Turbo Trix. Good Luck

 

AFR at the tailpipe FWIW.


Ummmm.....err...

 

DOH!

I'd have a hard time allowing anyone to tune my car unless they've got a solid reputation and loads of experience to back it up.

 

Well, this guy is one of the original pioneers of DSMs, so his reputation supercedes almost everyone. However, I'm not fond of his Evo tuning and business practices as a result of all that DSM success.

EcuTek is minimum $650 for the license, so you know he has already paid quite a bit...