Who di the initial tune?

Wayne at www.150tunes.com Ideally you need to dyno tune. Or someone locally with HPtuners that can at least clean it up.

 

Who di the initial tune?

Wayne at www.150tunes.com Ideally you need to dyno tune. Or someone locally with HPtuners that can at least clean it up.

BO185 I do have a place about 1 1/2 hrs away that has a Dyno/tune shop. I had the harness and PCM done by SWAP Specialties but they are apparently shutdown or out of business. Car runs and idles pretty well (havent driven) but it is running extremely rich. Just need to get a basic tune so i can get it to the Uhpolstery and Muffler shop.I will check out 150tunes

 

It is a new engine fron Texas Speed

Is there any reason not to have Texas Speed do it? Seems to me if they built the engine and supplied their camshaft in it, they should know what the VE table should look like, as well as the idle area.

 

Rick I believe Texas Speed uses MailOrder Tuning. I am going to check into them also. I saw something on their Website about no Speed Density tuning but not sure if that was for Email file for tuning.

 

It is running very rich to the point it fouls out the plugs in just a few minutes of running at idle.

...........................Car runs and idles pretty well (havent driven) but it is running extremely rich. ............

Don't see how it could idle "well" if it's running that rich. That's flooding out. Are you sure it's not leaking injectors? Codes? Does it hold fuel pressure? Re-start easy?

 

Acardon Yes it is holding fuel pressure 60 psi while running and then around 55-58 after shutdown. Fuel pressure does eventually leak down after a day or 2. It starts right up but after a few starts you can smell it loading up. I took the plugs out and they were slightly black/wet ( even amount on all plugs) . I havent run it for more that 2-3 minutes at a time. The injectors, fuel rails are brand new. I will check it for codes.

 

Rick said:
'You've got codes right now if your setup doesn't have a MAF sensor and the pcm hasn't been programmed for its deletion. If you've installed bigger injectors, has the pcm been programmed for them? "
Is this a drive by wire, or cable set up?
If the MAF is not there, you likely have no intake air sensor. [Unless you have put 1 in the intake tract]. If it's unhooked, or faulty, it can be telling the pcm that it's -40*F, and dumping fuel in.
If the MAP sensor is fubar, that will cause issues. 1 bar MAP?
If the TPS is fubar, same issue. Tells the pcm the engine is not at idle, and adds fuel.
You can leave the MAF in the intake tract, and set it to "fail". That way, the AIT sensor will work.

 

you will never get a mail order tune for a speed density setup that is really correct. Primarily because most LS users us a Maf sensor. Just take the car to a tuner and be done with it, or install a wideband O2 setup and get HP tuners and teach your self.

 

personally I would not do a stock ecu as a speed density setup. That is just a poor choice. for up to 900 hp with a stock ecu the Maf system is way better and much more flexible with weather and altitude changes.

 

If you have no MAF connector, a separate functional IAT, and no codes, apparently you are already speed density. When you had the pcm programmed previously did you advise the tuner that you'd be running the 42 lb Bosch injectors? If not, that is why you're running rich. If you are SD and your pcm is programmed for a stock cam, then with the new cam it's going to be rich on the low end and lean on the top end. MAF would try to overcome that.

The LS3 MAF sensor goes in a 4" tube. As I posted previously, it can be used with your gen3 setup.

There are advantages to both MAF and SD. MAF is easier to tune. MAF is better at steady state, SD better at transitions. MAF uses SD in some situations, and that is programmable. MAF might do better for a startup tune. SD is more likely to need a dyno tune just to get idle and driveability right.

I can't say if your combination is better off with MAF or SD. But Texas Speed should know.

 

If you have no MAF connector, a separate functional IAT, and no codes, apparently you are already speed density. When you had the pcm programmed previously did you advise the tuner that you'd be running the 42 lb Bosch injectors? If not, that is why you're running rich. If you are SD and your pcm is programmed for a stock cam, then with the new cam it's going to be rich on the low end and lean on the top end. MAF would try to overcome that.

The LS3 MAF sensor goes in a 4" tube. As I posted previously, it can be used with your gen3 setup.

There are advantages to both MAF and SD. MAF is easier to tune. MAF is better at steady state, SD better at transitions. MAF uses SD in some situations, and that is programmable. MAF might do better for a startup tune. SD is more likely to need a dyno tune just to get idle and driveability right.

I can't say if your combination is better off with MAF or SD. But Texas Speed should know.

I don't remember what i told him for injectors. I did give him Cam specs and a few other things. I will go with the MAF setup since it will not be a track car. Is there a particular MAF sensor to use or just go with the stock LS3? I do plan on learning how to tune. Been so busy with this prject i havent had time yet. I will drive to some car shows and probable the next Tri-Five convention.. Myrtle Beach SC to Bowling green would probably be the furthest.

 

To do the LS3 MAF, it won't be a plug and play, you will have to get the IAT calibration right. The MAF itself will have to be calibrated too, but that's what you do when dyno tuning. When this came up previously I found a couple of threads on the HPTuners forum discussing this.

To get this deal up and running you might be able to just put the correct info in the pcm for the injectors. Then you'd be able to drive it anyway. But there are several open ended issues here, so that may or may not be all it takes.

Since you don't have a MAF connector, you're going to have to add that to the harness.

 

Find a tuner local. They can tune it and adjust it while driving it. Most major cities will have a tuning place. Were do you live?

 

his profile says Myrtle Beach SC...
did a google search.. this what i found for tuners....

Best 9 Automobile Performance Racing Sports Car Equipment in Myrtle Beach, SC with Reviews

Automobile Performance Racing Sports Car Equipment in Myrtle Beach on YP.com. See reviews, photos, directions, phone numbers and more for the best Automobile Performance, Racing & Sports Car Equipment in Myrtle Beach, SC.

www.yellowpages.com

 

You won't need to add the MAF persay, if they tune it for SD he can dial it in pretty close. On a stock system IMO it does run better over all with a MAF though, the tuner may say other wise but GM used them stock.