Startup help LM7, Truck Norris NSR, etc..

[Bum454ss]

Hello all!
Been reading for a couple weeks now and somewhat overwhelmed still but Im ready to turn the key tomorrow for the first time, so I was looking for some guidance with the repository. Im not really seeing anything close to compare with.

I have an LM7/4L60E that came from a junkyard on a pallet.

706 heads that were cleaned up and reworked at the machine shop with new stock springs and oil seals.

New stock pushrods, rockers, timing chain, Truck Norris NSR cam, LS7 lifters, LS1 intake, Holley fuel rails and 48# injectors, blackheart long tubes headers, open exhaust for now but 3 inch Borlas waiting to go in..

Would love to start it up tomorrow but dont want to miss to hard on the tune. I dont think a stock tune will do much.

Thanks for any direction you can offer.

[tana99ss]

You will need to upload your tune along with a log of it if you want help.

[Bum454ss]

You will need to upload your tune along with a log of it if you want help.

I appreciate your reply. Other than the stock tune, which is no longer relevant I have no tune. I was actually looking for a little help getting to a start up tune.

[gtstorey]

You really don't know what is relevant. You don't even specify what your ECM came from. Even if someone was inclined to provide you with a start up tune, they need your existing tune to make changes too to insure that it is compatible with your ECM.

Tuning with HPT is not grab a tune and download it and go, at least not with the GM stuff. And while the repository files can be used for comparison, they are stock files that won't work for your modified setup, even if you particular ECM was known.

[Bum454ss]

You really don't know what is relevant. You don't even specify what your ECM came from. Even if someone was inclined to provide you with a start up tune, they need your existing tune to make changes too to insure that it is compatible with your ECM.

Tuning with HPT is not grab a tune and download it and go, at least not with the GM stuff. And while the repository files can be used for comparison, they are stock files that won't work for your modified setup, even if you particular ECM was known.

Dude, thank you for this straight forward response. I have my bench rig coming today and I?ll be able to pull the stock tune and figure some things out. It came from the junkyard, so I don?t know what it was in.

Thanks

[Bum454ss]

Wanted to update this post with my .hpt from the junkyard 5.3. that i started with which i now know is a P59. My intention is to copy this tune to the new P01 that I purchased from AutoZone that does not have a vin yet. Then I will be able to adjust for the components that I have listed above, and work myself into a startup tune.

[gtstorey]

I don’t know the in depths of the p01/p59 you likely don’t want to copy one onto the other. Not if you mean just read one and then write that file to the other. You might be able to compare certain tables from one and modify the other, but doubtful that they gave the same operating system.

[tana99ss]

Ok let’s start with your wiring harness is it red blue or green blue

Red blue use p01
Green blue use p59

You can use p59 for some DBC setups but I don’t recall which ones off the top of my head.

Once your set back to a stock tune, fix your fuel injector data.

Once you’ve done that I would really suggest getting exhaust and staying away from open header or exhaust as you say

[Bum454ss]

I don’t know the in depths of the p01/p59 you likely don’t want to copy one onto the other. Not if you mean just read one and then write that file to the other. You might be able to compare certain tables from one and modify the other, but doubtful that they gave the same operating system.

No, I definitely wouldn’t want to copy one straight to the other without comparing some things first mainly the addition of the IAC and TPS for a DBW to DBC swap on top of everything else.

[Bum454ss]

Ok let’s start with your wiring harness is it red blue or green blue

Red blue use p01
Green blue use p59

You can use p59 for some DBC setups but I don’t recall which ones off the top of my head.

Once your set back to a stock tune, fix your fuel injector data.

Once you’ve done that I would really suggest getting exhaust and staying away from open header or exhaust as you say

It is a green/blue that I reworked following the directions on LT1swap.com specifically for the DBW to DBC swap and reworked the harness for this specific P01, which has the driver for the IAC. But that’s about all I know about that so far. The exhaust will get a set of 3” Borla duals with cutouts just for fun moments here and there at the car show. 17 yr old daughters truck. Dad/daughter project.. etc.

Thanks for the reply’s.

[edcmat-l1]

Wanted to update this post with my .hpt from the junkyard 5.3. that i started with which i now know is a P59. My intention is to copy this tune to the new P01 that I purchased from AutoZone that does not have a vin yet. Then I will be able to adjust for the components that I have listed above, and work myself into a startup tune.

Both of those files are DBW.

[tana99ss]

Ok there are plenty lm7 you can use to get this to going. Most truck Norris cams I’ve tuned was able to start and idle on there own off a stock tune. Does it mean it’s correct , no, but it should allow you to get enough data to dial it in. You will need exhaust so you can utilize your STFT/LTFT. Now this is important, If you DO NOT HAVE A WIDEBAND, DO NOT GO WOT (wide open throttle / full throttle / pedal to the metal)

But we can get you going for sure. Find a stock tune , update your injector data and upload it , we will verify it

[Bum454ss]

Holley 522-481 48# injectors and they have that data on their site so I’ll do that this afternoon when I get back to the shop. Cool to hear that it should start and idle on the stock tune. I’ll change the sys/etc1/0 as well. I do have front O2 sensors in at the collector.

[edcmat-l1]

Holley 522-481 48# injectors and they have that data on their site so I’ll do that this afternoon when I get back to the shop. Cool to hear that it should start and idle on the stock tune. I’ll change the sys/etc1/0 as well. I do have front O2 sensors in at the collector.

Holley does not have injector data in GM format.

You can't just flip the system switch from 1 to 0. That don't work. You need to start with a DBC operating system. I'd suggest something like a 2002 F body OS.

[Bum454ss]

Holley does not have injector data in GM format.

You can't just flip the system switch from 1 to 0. That don't work. You need to start with a DBC operating system. I'd suggest something like a 2002 F body OS.

So have I screwed myself by using these injectors before I even get started? In the mean time I'm going right now to look for a 2002 Camaro DBC.

[Bum454ss]

Before I try to write to this new P01... I will have to buy a couple of credits. I will also need to add a vin number to the P01 unit. I would want to use the vin from the original P59 that came with this engine from the junkyard?

[Bum454ss]

P01 with the new 2002FBody stock tune from the repository using the VIN from the swap. I believe I copied over all of the pertinent information and have saved a new file. I'm still looking for the correct injector data for the holley injectors.

thanks for the help!

[tana99ss]

So here is where I'm at with this. I've attempted to find data on Holley injectors and apparently there is not valid information for GM vehicles. What i would recommend is to sell the Holley injectors and buy some Stock GM injectors off ebay ( less than 100 bucks) and the data can be found in the attachment (thank blindsquirrel for the data ).



12594512 - 36lb LMG, LC9 (https://www.ebay.com/itm/40259261183...mis&media=COPY)
12613411 - 38lb LMG (https://www.ebay.com/itm/40276092874...mis&media=COPY)
12576341 - 42lb LS3, LS7, various (all?) GMPP/CPP crate engines (https://www.ebay.com/itm/40405034373...mis&media=COPY)
12613412 - 50lb L96 (https://www.ebay.com/itm/27442490602...mis&media=COPY)

Either one of these is more than enought fuel for a cam only LM7. Be sure to buy the needed adapters/plugs needed to make them work

[gtstorey]

I would be scared to source injectors off eBay except for the ones that BlindSquirrel has linked. Especially ones that ship from California since they are usually straight off the boat from China (counterfeit).

[Bum454ss]

Understood. I do have a set of 01D030B 42# that came with the LS1 intake. I then went Holley rails and injectors thinking future sniper efi setup. But that’s a ways off. I’ll do some research on the ones I cleaned up this morning before I order another set. Thank you for the links. If I order, I will only order from those.