Finished my first tune...still have low numbers with MS3?

[stereotypicalv8guy]

Okay so I have an '01 Camaro Z28 with the stock 3.42 gears. Only mods are an MS3 cam, Patriot dual valve springs, Granatelli MAF, off road TSP 1 7/8" headers, and a flowmaster exhaust.

I used the HP/TQ calculator config and was only able to come up with 350HP and 330TQ. And I'm pretty sure that's only measuring to the flywheel so...that really sucks. I followed the "BBA VE MAF and PE Tuning Procedure" guide as well and STFTs were all within +- 3 and all of the MAF calibration corrections were within +- 5 so I don't think that's the problem...could be wrong though...

I've attached the tune...maybe there is something I've missed that will jump out at you guys?

[SargeZ06]

Your PE Enable seems a little high. It's set at 85kPa. Shouldn't it be around 15kPa?

I believe that would keep you from hitting Power Enrichment until much later in the run.

Others may correct me if I'm wrong.

[stereotypicalv8guy]

Damn, you're right...15 is what it has on the stock tune. I wonder why that guide told me to set it to 85? I'm still new to tuning...I've messed with piggybacks in the past so spark advance and AFRs I can understand in my sleep but I am definitely just getting my feet wet with the more advanced aspects to tuning.

[SargeZ06]

There are situations I guess where you would set the PE Enable to 85kpa or something else. I've left mine stock and I get what I want.

You are essentially a bolt-on car with a cam. I don't see why stock setting wouldn't work for you.

[stereotypicalv8guy]

Well that didn't really seem to fix anything. The STFTs are all over the place now...which is weird because with the MAF disconnect the VE STFTs were all within 3 and then when calibrating the MAF they were all within 5.

I went ahead and attached the log file for a short logging session I just did. I have one good 0-70 sprint in there to give an idea of how it feels power-wise.

[bene]

Put in your stock maf. Start all over tune from VE to MAF to PE with the stock MAF.

I'm running stock MAF with screen.

[stereotypicalv8guy]

I wish I had the stock one. I bought the car with this POS already on it. I'd heard it sucks but when I was calibrating it everything seemed to be fine at the time. I'll put it on the list of things to buy and try before I continue asking around on here though.

[n20kid]

You need to REALLY clean up that VE Table.. You are giving up so much power and drivability from what i am looking at..

[stereotypicalv8guy]

You mean smooth it out more? I tried to smooth it out as much as possible while still keeping the STFTs within +- 3 but I guess I could give it another go.

[n20kid]

Hard fuel/timing transition's will yield less than desirable drivability... You may think it drives good but looking at that i know you are giving up so much. I cant help you with stft tuning, i have done it but don't prefer to. I only tune logging my wideband.. Plus u gotta think how old are those 02's you are trying to tune with? on top of it being a MS3 cam, u really need to get a wideband and start your tuning there.. Buy the new PLX DM-6 & SM-AFR Combo gauge, it is only $199 and it works really well and u dont have to deal with alot of the headaches logging other widebands that u may have read on here.. It works beautifully!

[stereotypicalv8guy]

I plan on getting a wideband at the same time I ditch the Flowmaster exhaust (with tax returns). Just trying to make do with what I currently have though. Even so, I thought fuel trims had to be in line for driveability and the wideband was best left to WOT tuning?

[n20kid]

Tuning by short term fuel trim's to me is definately far from the best way to do it.. i do all tuning Idle/Part Throttle/WOT solely with the wideband.. My car is on a OLSD tune.. I do not have one single factory o2 in the car.. Almost all the car's i tune are either OLMAF or OLSD or custom 2/3 bar setup's..

[LSxpwrdZ]

There is nothing wrong with closed loop when properly calibrated for it. When you modify the car with longtubes and a camshaft with significant more overlap than factory then you have to calibrate alot of the closed loop settings to get it to operate correctly. Tuning with a wideband is best like stated already, then once you have the fueling correct you can then tweak the closed loop settings to target what you are getting with your wideband and then you are set!

I would recommend the NGK AFX wideband. I've used alot of different widebands and it is by far the best and most reliable. Equally as good is the Haltech wideband. My dyno came with one of them and I also run one in my Camaro full time and it is also just as accurate but does have a wider range of reading than the NGK does.

Leave your PE enable to 85kpa. The thing with PE is all those conditions must be met in order to enable PE. I normally set most of my NA car's to ~75kpa so that the engine is under load before PE can enable, otherwise fuel is being wasted because there is no sense in running rich when the engine isn't under load. I know the TPS enable table also plays a role here but the load point is an added measure that must be met along with TPS to enable.

[MMGT1]

Agree 100% ^^

I would go with the 75kpa on your build. Also, just grab a MAF from a local wrecker. Dont give them more than 50 bucks for one...lol Leave the screen in it, lots of reading here on that! I fell for that G MAF back in the day.Still have it around here somewhere. They "look" like they read fine, but wait till you see the difference when you have a proper GM unit in there.

[edcmat-l1]

Oh Sh*t! Just read you have a crapatelli MAF. Throw it in the can and put a stocker back in it!

[stereotypicalv8guy]

I have a stocker on the way. $55 shipped...not too bad. I know the Granatelli is shit but I thought if I just calibrated it then everything would be fine...nope. I'll set the PE to 75kpa...didn't really notice any big difference going back to 15 but I also don't have a wideband yet so who knows. I've heard good things about the NGK AFX so I'll definitely be looking at getting that when tax returns come around.

[MMGT1]

Ive had that unit for 4 seasons now and has served me just fine. Replaced sensor once due to folding it taking it out one day..lol I have a proper O2 removal socket now

[bene]

I've heard good things about the NGK AFX so I'll definitely be looking at getting that when tax returns come around.

It's what I have and it's great.

[WS6FirebirdTA00]

Don't get caught up in calculated numbers. When you get the WB and tune the fueling well, put it on a dyno.

Don't expect the torque to be high with that cam (especially with those larger primary headers on top of it).

[gn2beatu]

You said you changed the MAP enable PE to 15 from 85. Have you tried other values? Sometimes it doesnt hurt to stay out of PE until a couple hundred RPM under your brake stall value. Go in too early and that combined with the added enrichment from the AE/tip in, and you may be a little rich early. All I'm saying is try a few differant values, you may pick up a bit on your 60' that way.