Mild build 302 tuning

Vehicle specific forum for tuning the Foxbody Chassis Mustangs utilizing the LUX0, GUFA, GUFB, and GUF1 Strategy

Mild build 302 tuning

Unread postby jhine5588 » Wed Dec 20, 2017 6:59 pm

I'm back with another project. Mine is on hold for the cold months here in the Northeast but my buddy and I are ready to fire his '56 pickup here in the next week or so. I figured I'd start a thread to kind of get some info out there before I run into any snags. I won't get into much details other than engine specs.

There is a lot about it that we don't know but here is what we do know:
302 base bottom end
Edelbrock E-street heads
shorty headers
aftermarket TB and EGR spacer
stock injectors
Aeromotive FPR
Pro-M mass air- I have to get the part number cause I think he bought one for 42# injectors rather than 60# like I told him per decipha's writeup

We are running an AOD with Lokar throttle cable and kickdown setup. We would like to run the fan with the computer. His AC system is stand alone from Vintage Air but has a signal going into the EEC. He used the FRP 5.0 mass air harness and we are using an A9L computer.

I will be starting with the A9L2 base calibration to get it running/mobile before it goes off to the paint shop. I will keep you all posted with any issues and progress that might happen.



Jeremy
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Re: Mild build 302 tuning

Unread postby SlowBox » Wed Dec 20, 2017 8:46 pm

Y'all shouldn't have to many problems with it. The injectors will be pegged but I'm sure you already know that. Make sure you get the kickdown right because it will trash the trans if it's not.
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Re: Mild build 302 tuning

Unread postby jhine5588 » Thu Dec 21, 2017 11:18 am

I figured the injectors would be close provided it isn't stroked and the cam isn't ridiculous. No idea what either are however... Guess we will find out!



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Re: Mild build 302 tuning

Unread postby jhine5588 » Fri Jan 12, 2018 5:10 pm

We ran into a bit of a snag. The previous owner never locked the converter into the pump and we didn't find that out till we were trying to bar the engine over to get #1 TDC!! That is repaired and we will be attempting the first start tomorrow morning. Fingers crossed it goes well!



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Re: Mild build 302 tuning

Unread postby decipha » Fri Jan 12, 2018 10:08 pm

kick up the base pressure to 85 psi and dial it in

otherwise set the limiter to 3k
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Re: Mild build 302 tuning

Unread postby jhine5588 » Sat Jan 13, 2018 5:23 am

Decipha, are you recommending to keep the fuel pressure at 85 for the sake of the injectors?

It is a PRO-M 80 mass air. Are their numbers pretty accurate? BTW, it appears to be for 42# injectors if I'm looking at this correct... I attached a picture of the sheet.

If I'm thinking about this correctly I can multiply the stock MAF transfer by 45% (19/42=.45) to get the 42# calibrated meter back down to match the 19# injectors...

This is my first time having to do this and don't want the truck to not start due to an air/fuel issue. Thanks!



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Re: Mild build 302 tuning

Unread postby decipha » Sat Jan 13, 2018 11:23 pm

yes the injectors are entirely too small, anytime u put aftermarket heads on a 302 you need 30 lb injectors MINIMUM

pro-m flow sheets are usually pretty close

no such thing as matching maf to injectors when you are tuning, but your math is correct for the actual maf curve for that meter

it takes a huge fuel error for a vehicle to not start so no worries
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Re: Mild build 302 tuning

Unread postby jhine5588 » Sun Jan 14, 2018 1:07 pm

Ok, thanks for the heads-up on the injector sizing.

Come to find out they didn't fix the binding issue on the converter. I had to pull the trans back out yesterday to unstick the converter and break the bad news that he needs to buy a new one. Hopefully be back at it this week.



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Re: Mild build 302 tuning

Unread postby jhine5588 » Thu Jan 18, 2018 6:52 pm

Got the thing running... Kinda. She doesn't want to idle. I haven't adjusted the idle screw yet but I took a log quick.

The log is with the fuel pressure at 45psi because it didn't start at all above 60psi (still only has a 60psi gauge) and the TPS unplugged.

All I did was punch in the MAF transfer numbers and multiply them by .45.

I'd like to have this running this weekend. I'd appreciate any help!



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Re: Mild build 302 tuning

Unread postby decipha » Thu Jan 18, 2018 7:44 pm

did you put the injector info in for it at 60psi?

you cant just change the fuel pressure without changing the injector data
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Re: Mild build 302 tuning

Unread postby jhine5588 » Fri Jan 19, 2018 5:10 pm

I did not. I reviewed the fuel write up and got the info I need. That makes sense as it seemed to want to run better with the fuel pressure lowered back down. I did move the low slope a little but didn't really make much difference. Decipha, you talk about tuning the slopes based on pressure but not the voltage offset. How do I go about that?

It appears this engine is an 87 truck engine. I haven't verified whether or not it has an HO firing order or not yet as again, I have no idea what cam they put in this engine. How important is the firing order programmed into the EEC for the injectors? I understand the sequential injection won't be correct, however I think the engine should run regardless.



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Re: Mild build 302 tuning

Unread postby decipha » Fri Jan 19, 2018 7:50 pm

its no easy feat to dial in injectors when you don't have an accurate dialed in maf, best bet is to load in the 42lb maf data for your maf, leave the injector data stock and run the stock fuel pressure, dial in the maf and make sure its accurate at the lower pressure, then crank up the pressure and dial in the injector data until you get exactly what you had before

for dialing in the offset, you can start by kicking it up by the amount the fuel pressure changed, the same applies for the slopes as well as a general ball park estimate to begin tuning it

if it was at 40 and you kick it up to 85, 85 - 40 = 45, thus go multiply the slopes offset and breakpoint by 1.45, then begin dialing it in until its back where it was before you cranked up the pressure

for the offset, the easiest way to dial it in is to adjust it during a high rpm decel, match the afr on high rpm decel to exactly what it was before the fuel pressure was adjusted
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91 4r70w - Skarlett
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93 auto - Danika
94 5spd Rionda
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Re: Mild build 302 tuning

Unread postby jhine5588 » Sun Jan 21, 2018 6:26 am

That's pretty much where I'm at now. Stock pressure, stock injectors data, 42# MAF numbers from the sheet multiplied by .45

This thing still won't run. Runs for about 15 seconds Max and then dies like you shut the key off. I verified everything is getting power in both crank and run, I'm getting a 15 and a 96 code. I'm going to try a new ignition module today as the new MSD distributor is dated 2012... I'm at a loss.

I did verify yesterday #1 TDC using the piston stop method, verified the engine does have a cam with the HO firing order, and it has 1.6 roller rockers. It sounds decent when it does start, but it just dies very shortly after.



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Re: Mild build 302 tuning

Unread postby jhine5588 » Sun Jan 21, 2018 10:43 am

It runs. Come to find out the MAF transfer numbers did not work. Discovered today that it would run with the MAF disconnected. So started fresh with the A9L2 base tune and started manually setting the MAF transfer between .25 and 1.00 until it would maintain idle. Ended up like so:

MAF Transfer-
1.50V-63.4
1.25V-46.6
1.00V-39.9
0.75V-36.1
0.50V-30.1
0.25V-21.9

It seems to be happy... Rev limiter is set to 3000 for sake of fuel pressure and the stock injectors. Unfortunately this project is put on hold now as the owner won't be back in town till March.

We did replaced the ignition module with a known good one however it didn't seem to make a difference. I'm going to swap his module back onto it when I get back to working on it.



Jeremy
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Re: Mild build 302 tuning

Unread postby decipha » Sun Jan 21, 2018 6:56 pm

throw that MSD distributor in the trash and upgrade to a stock unit
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Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce

Re: Mild build 302 tuning

Unread postby jhine5588 » Sun Jan 21, 2018 7:13 pm

Haha, the truck came with the MSD distributor... It matches the color of the truck. I'm just happy the damn thing runs now!!



Jeremy
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Re: Mild build 302 tuning

Unread postby decipha » Mon Jan 22, 2018 12:07 am

nice, if aesthetics are your thing, you can keep the cap and unbolt the cover and swap it on to the oem dis when you upgrade back to a stock unit. Your engine will appreciate it.
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90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce

Re: Mild build 302 tuning

Unread postby jhine5588 » Sat Mar 31, 2018 1:54 pm

She's going on the dyno today. I'll keep you guys posted on any issues we may run into.



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