RAIN H8R

"Timing was 15* on low boost roughly 10 psi. The timing on the high boost was 13-14* at 14.5 psi. Target A/F was 11.9:1 on both runs."

Any more timing and it would detonate

s2000Junky

Yes timing and boost both make the difference. Boost forces in more air per combustion cycle, and ignition timing allows more time before that air and fuel is ignited creating more power. Too much timing or timing and boost can cause detonation. There is a point near the detonation threshold where the choice is to either add more timing or add more boost instead. More timing also cools the combustion rather more boost heats things up. But generally more boost is the way to go until you cant anymore. Timing is more efficient overall, but again it’s a balance. Seems a little confusing but its not, you just see what the set up wants to make, with how it responds to these inputs. A more efficient design ie: better breathing and at cooler temps will be more forgiving when timing is introduced.

s2000Junky

Well there you go, its the tune, not the set up per say. Your tuner felt best given the boost amount, to curtail the timing advance, because risk of detonation at the top end. More timing can obviously be had in the lower rpms and benefit the overall power band with the higher boost there.

DaGou

S2000junky said it for me " Probably feels like a light switch with power delivery at WOT from low rpm to when boost comes on. Not sure how that would be to control on a road course at the limit, or how smooth your partial throttle is under partial load/minimal boost in the mid range where the turbo is begging for gas pedal, but I’m sure you will get a good sense of that in time and can better compare the drivability and forgiveness between the two."

Not sure if I want to have a car that I drive on the street in the twisties or on the track to have the power delivery of a light switch. Yes it spools super fast but like anything too much of a good thing is not always the best thing. You have so much more under the curve for both HP and torque(say at 5200 RPM you have 70 more ft/lbs and 70 more HP than a SC, lol not even talking about over stock). But will you miss running the car up 9,000 RPM? After 7K you have nothing more. I am sure you will not miss the 19 HP you lost on the top end. Again these are numbers we can BS about forever. I really want you to put sevearl hundred miles and a track day on the car and see what your actual driving experience is like.

herecomesboost

Those values are fine

Jmays2k

Are you running a after market rear end or is there no need? if so which one would you recommend for this amount of power.

s2000442

Looks like this kit is begging for E85 and more timing in the upper end. I know from past experience that King Motorsports tend to err on the conservative side which is not a bad thing.

Dustin, have you thought about taking a nice drive up to LJ at Fullblown and let gim have a crack at tuning the car? Just a thought.

In the end its your car and you have to please no one but yourself!

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RAIN H8R

I prefer a conservative tune over agrressive one. If you cannot run more timing due to detonation, It is obviously a setup issue not a tuning issue. Keep in mind im on a 2.2l not a 2.0l. The amount of timing you rjn changes between the two engine. One sits at tdc longer than the other and as a result dictates the amount of time you can run.

Tuning the car on race gas will net more power, but it will still end up with a flat lined graph near redline

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camuman

It's plenty for the street. Great response and fat power band. Have fun with it.

s2000Junky

Dustin, if you feel inclined post up the timing curve for the 15psi tune, I'd be curious to see it