chucks_net

Please help

I have been searching for a while about TPI and tuning options. The good news is there there is a TON of info, the bad news is that its information overload! Please guide me...


Situation:I have a 91 z28 with a new 350 crate/ T56 stock TPI. The crate engine has a decent build 350-400HP. The car originally had the 305/ 5 speed setup. I believe this harness and ECU to still be stock.

I am surprised it runs as well as it does as she sits. I get the occaisional shutoff at when she comes to a stop and she runs rich. No lag or blips through the RPM range but she could definitely run better. The car is a bear to drive, any throttle blip in first/ second and the car is sideways.

The goal:

Near term

1) Keep the intake & ECU. Do minimal effort, get her running correctly.

-a plug & play chip to run a med build 350 with a 305 TPI would be great

-I can't jump into #2 right now as this is my daily driver as I rebuild my primary vehicle


Longer term

2) Completely/ partially replace the fuel injection system. I want a tune that is better than what was available in 1991.

I want to adjust my mix/ duration/ ping with a tablet, laptop, or a little hand tuner on the fly as well as show engine diagnostics.

Plenty of generic/ carb replacement kits, I need one specifically to bolt in place of the stock TPI units and ECU. All the ones I have come across are to replace a carb'd unit.

chucks_net

Looks like for #1 I will need

-350 standard prom
-350 knock sensor
-24lb injectors



Anything I'm forgetting?

Tuned Performance

iTrader: (92)

Is this speed density since this is in a 91 ? If so start with a aujp and tune from there. I have also had to work with iac follower in this setup.

chucks_net

How do I check if its "Speed density"? I don't think I have an MAF


aujp is for an Auto trans -I have a 6 speed, wondering what parameters change if I use a BIN for a 6 speed vette body (ARYU)

Tuned Performance

iTrader: (92)

Arya has a lot of sa for iron heads, do the .bin compare to see the differences.

If you have a map sensor than you are running a 1227730,16196344 or 16198262 ecm with the $8d mask.

chucks_net

I do have one of those black boxes on my plenum... according to some docs I'm reading I must have the 1227730 ECM -whats the $8d mask?


tunedperformanc... thanks for your responses. I am Brand new to messing with old car EFI

I don't have the tools for programming cars yet, just motorcycle ECUs... although some of the tools will work for both (ECM spy and Megalog)

I would like to use tools that work on windows as well as android. I really like the idea of seeing parameters as I drive. I feel that I can map to my driving style. To me thats better than a dyno tune.

I'm pretty excited to learn these new skills, I love my Gen3

chucks_net

Oh, almost forgot, for my newer LS based crate the AUJP is the best starting point? -just confirming


Can't wait to get this dialed in to my clumsy/ lead foot!

Tuned Performance

iTrader: (92)

Im not sure what you mean LS based, Most p4 tuners use tunerpro or tunercat. If you have the old 305 speed density memcal you can use that but will not retain a accurate knock retard. There is dynamic efi ebl p4 that you might want to look at or emulating, The stock gm memcals use a uv erasable eprom you can use a piggyback adapter from moates.net and runa sst27sf512 eeprom or even solder in a dip socket onto your stock memcal. There is a ton on information on tuning in the diy prom stickies. If this is a mild 350 tpi I would start with a aujp and modify the iac follower a bit and datalog from there.

chucks_net

Awesome info

I can solder in a DIP socket no prob.

WOW that EBL P4 is pretty awesome http://www.dynamicefi.com/EBL_P4_Flash.php I dont care about the price -I have already spent waaaay to much on this car to part with her anytime soon. The real hurt is buying something I dont need...

Tunerpro/ tunercat and efi ebl p4 will get me going? Is this a good MEMCAL emulator system? Is there one better? http://www.dynamicefi.com/EBL_P4_Flash.php


I'm really looking forward to a precise tune. On bikes I can tune the fuel mix and timing for every gear at 500RPM increments with cheap equipment.

Thanks for your help. This is great info that will get me going.

Tuned Performance

iTrader: (92)

If you start adding up the price of a moates.net burn2 and ostrich 2 a usb datalog cable and a few sst's the ebl make alot of sence. It take alot of the home work out of tuning. You can download tunerpro for free but to support the hobby and the diyers I suggest doing the contribution .

chucks_net

If I was going down the moates road what products would you recommend?

I would like emulation and data logging.

If I get the moates.net APU1 it looks like I will be able to do logging and emulation as well as flash for other people right? $329: http://www.moates.net/apu1-autoprom-....html?cPath=64

moates.net says "you'll still need a chip adapter and probably a ZIF" I think that is an extra $70 here: http://www.moates.net/gp3-switcher-a....html?cPath=64

Or would this one be better at $55: http://www.moates.net/gp1-package-gm....html?cPath=64

What else will I need from moates?




For EBL it seems that all I would need is the P4 setup $450: http://www.dynamicefi.com/EBL_P4_Flash.php



So far it seems that moates has the better more flexible package. I just wish there was a clear list of "stuff to buy" to get me going.

Tuned Performance

iTrader: (92)

The apu1 is the all in one, emulation, data log and burner. If you plan on tuning several older gm cars I would go that route. If not you can get away witch soldering in a d2 or buy a g1 but if you buy one with a zif just use it for tuning they fail after a while and its no fun to drive in limp home mode. So a ostrich 2 a cable from aldl.com, burn2 hdr1 and a few sst27sf512. If this is going to be the only gm car your going to tune save your self some work and get the ebl p4.

Tuned Performance

iTrader: (92)

This is a memcal I modified for a member to use a sst in

chucks_net

Looking at megasquirt MS3 -any feedback on that?

chucks_net

OK here is what it looks like to me

The moates APU1 is the most flexible plug and play type of tuning system. You can even map your friends chips

The megasquirt MS3 is the fastest most flexible system and a great ECM replacement

I will buy the moates.net APU1 along with a 350 knock sensor, and 24lb injectors

That should get me going and tuned

From there I will look to replace the ECM with a MS3 system. Hopefully there will be a write-up on the MS3 like there is for the MS2 http://www.diyautotune.com/tech_arti...lock_v8_v6.htm

Tuned Performance

iTrader: (92)

The mega squirt has good reviews but I'm just a fan of good old oem or oem add ons like the ebl. You don't need to buy a a knock sensor for a 350. The frequency the knock filter that is on your 305 memcal will only work with a 305 knock sensor. You will need to buy a anjf, or aujp or 90-91 corvette tpi memcal, go without the knock retard witch is not that good of a idea or you can use a tpi maf external esc module and 350 knock sensor from someone parting out a thirdgen or junkyard and wire it externally. This modification may require you to solder in a 3.9k resister on the memcal.

chucks_net

So just run the moates emulator and change out the injectors?

I'm not sure if the knock sensor came with the crate or is from the old motor

thanks again for your help. I know I will be able to return the favor eventually

Tuned Performance

iTrader: (92)

The moates ostrich or apu1 will work for tuning until you burn a prom, if this is just a mild 350 the Bosch 3s 22#hr are a good choice and southbay fuel injectors give a 10% discount to tgo members. You still need a memcal in place with either emulator so a g1 or dip on the memcal will work.

http://m.southbayfuelinjectors.com/p...7&product=1502

chucks_net

Agreed, I don't plan to play with it too much. Set it up and let her ride. At least at first, I have other items to worry about once this car has a decent tune.

It has about everything done. Crank, rods, piston, heads, cams, intake, headers, full borla, ignition... good strong, reliable build. I'm thinking 24lb for room to grow. I plan to upgrade my fuel supply plumbing as well.



memcal? I can flash my stock chip/ PROM right? Should be memcal for a 91Z 305 TPI already in there right? I thought the ePROM for certain years is referred to as MEMCAL?

Then you are saying I should put a DIP socket on the ECM? Not sure what a G1 is

ninetyone

iTrader: (2)

If your stock eprom has the small quartz window on it , you can erase it with a special UV eraser. First, You will have to de-solder it(the eprom) to get it out of the memcal. So, that is why someone suggested the G1 adapter. This way you can burn a fresh eprom and use it instead. This is just an interface/adapter. http://static.moates.net/gmecm/g1/g1.htm