[Official] "Do I need a tune with bolt-ons?" thread

[Maduro]

Originally Posted by Chuck33079

What do you mean it didn't take? What does a stock 370 put down on that dyno? You might be on a low reading dyno.

Well they did manage to get one read of 285 whp but I feel thats a lil low for the mods i got and I've compared it to others that are doing 300+

[Chuck33079]

Originally Posted by Maduro

Well they did manage to get one read of 285 whp but I feel thats a lil low for the mods i got and I've compared it to others that are doing 300+

That number means nothing without a baseline or at least knowing what a stock 370 puts down on that dyno. If a stock 370 puts down 270 on that dyno, your number is low. If it puts down 245, then your gain is in line with others with the same mods.

[Maduro]

Originally Posted by Chuck33079

That number means nothing without a baseline or at least knowing what a stock 370 puts down on that dyno. If a stock 370 puts down 270 on that dyno, your number is low. If it puts down 245, then your gain is in line with others with the same mods.

Didn't even think of that - How much Does a 2013 base 370z puts down ???

[Chuck33079]

Ask the place you got dynoed. What kind of dyno was it? They're not all the same.

[brucelidat]

So I had a tune done a while back when I installed my HFCs and CBE. I recently installed the Stillen gen 3 CAI and am planning to install the m370 intake manifold. Will the combinaiton of those 2 new bolt-ons cause any problems like running too lean without a re-tune? I'm trying to figure out if I should install the m370 this week or wait until next week when my tuner is available to do the re-tune. I don't want to run into any issues with it being too lean during the cruise this weekend.

[Navyboy916]

You will run leaner with the manifold but not to the point where it will be serious. You will be ok until your next tune.

[ANMVQ]

Always wondered about when to tune also?
With Takeda longtube , catback , and FIRHFC'S my AF's at WOT are 12.5
AEM wideband

[VincentLe]

is it safe to run CBE and res. tp's without a tune?

[seymore4]

Test pipes will require a tune

[wolfesquire]

R2C cold air intake, Fast Intentions exhaust, Motordyne test pipes, and I was told headers would also be a good investment as well. Thinking a tune will be needed? Headers worth buying?

[Live4Driving]

What is the leanest AFR that is typically considered safe? I have done some searching on the web and I've seen people talk about the ideal AFR mixture settings with a tune and people warning of leaning out a car but at what point is the AFR considered too lean that it hurts the engine? Anything above 13 or 14.7 or is there another general point that I am missing?

[jwick]

Originally Posted by Live4Driving

What is the leanest AFR that is typically considered safe? I have done some searching on the web and I've seen people talk about the ideal AFR mixture settings with a tune and people warning of leaning out a car but at what point is the AFR considered too lean that it hurts the engine? Anything above 13 or 14.7 or is there another general point that I am missing?

14.7 is idle. I don't recall exactly from my NA tune but I don't think I go leaner than 11.7ish.

[synolimit]

Originally Posted by Live4Driving

What is the leanest AFR that is typically considered safe? I have done some searching on the web and I've seen people talk about the ideal AFR mixture settings with a tune and people warning of leaning out a car but at what point is the AFR considered too lean that it hurts the engine? Anything above 13 or 14.7 or is there another general point that I am missing?

Knock. Leaning a car out to far will eventually knock, same with adding boost and timing. It's all a dance trying to find the perfect combo. You might get away with say 12.8afr but if you're only running 20 degrees of timing then who cares? Your power will suck. I guess most NA tuners shoot for mid 12's on these cars but they also try for good safe timing. I don't know what will get you more hp in the long run but if you go from 12.5 down to 12.3 yet you sneak in another degree of timing then you've done good I'd say. On a turbo car like my old one 1 psi and 1 degree were good for over 10hp. So you add as much as you can till the knock sensor says no.

PS you're correct. High is lean, low is rich. The numbers you see are parts of air (14.7) that equals 1 part fuel (14.7:1). So a lower number means you're taking air away from that 1 part fuel which is richening the ratio.

[Live4Driving]

Isn't 11.7 very rich? My understanding is that, the higher the number, the leaner it was. From what I have seen, ideal power is 12.5 (rich) to 13.5 (lean) but under normal cruising and idle, you want to be around 14.7. I will start a new thread, to see if a proper title will garner more interest.

[Chuck33079]

Originally Posted by Live4Driving

Isn't 11.7 very rich? My understanding is that, the higher the number, the leaner it was. From what I have seen, ideal power is 12.5 (rich) to 13.5 (lean) but under normal cruising and idle, you want to be around 14.7. I will start a new thread, to see if a proper title will garner more interest.

The number for ideal power is in ideal conditions. You need to leave enough headroom for gas, IAT and so on.