How To Request: Convert to 3bar Setup for Turbo

[scottt28]

I have a 3bar MAP sensor Part #12592525 and larger injectors ready for a switch to turbo boost. I'm using a GM E38 ECM and HP Tuners version 3.4.78 to tune it.

I can't seem to quickly find the process for going to a single bar NA setup to a 3bar turbocharged setup. I could really use a How To document in bullet point format right about now.

Some guys have suggested I will be going to a Speed Density tune. Please supply your opinions and let me know how to do it. Remove the MAF sensor and then??

The turbo headers haven't shown up yet, so I am starting to build the cold side right now. Many thanks in advance to those that chime in.

[DSteck]

Where in Texas are you? May be better to take it somewhere. Technically you don't need a custom operating system to use a boost map sensor. You don't need to ditch the maf either.

[scottt28]

Where in Texas are you? May be better to take it somewhere. Technically you don't need a custom operating system to use a boost map sensor. You don't need to ditch the maf either.

I live right up the road from you in Round Rock. Mocking up the cold side today.

Is it as simple as installing all the parts (hot sode, cold side, injectors etc). and firing it up?

[DSteck]

Yea today is gross. Lol.

Yes. Put in map sensor data and injector data, and go. The enhanced OS gives some more functions but nothing required. The only nice thing is the boost enrichment.

[GHuggins]

And baro update limiter if your running SD only... I personally think of that one being the most important - not so much at lower altitudes, but if changing altitude at all - very important as fueling will change 5 to 20%...

[scottt28]

Yea today is gross. Lol.

Yes. Put in map sensor data and injector data, and go. The enhanced OS gives some more functions but nothing required. The only nice thing is the boost enrichment.

I'm using 120 lb TFS Injectors... No scaling required with the new setups?

Some have suggested that you ultimately end up with a speed density tune when boosting... if that's the case, can't I just get rid of the MAF?

[5FDP]

Some computers allow for 127lb/hr injectors before needing to scale, without knowing exactly what you are using I can't tell you.

[scottt28]

Some computers allow for 127lb/hr injectors before needing to scale, without knowing exactly what you are using I can't tell you.

GM E38 ECM and Fuel Injectors, TFX™, 120 Lbs./Hr., Bosch-Style, 2.2 Ohms Impedence, Jetronic Plug, Universal, Set of 8.

[veee8]

Those are low impedance injectors and not plug and play with your ECM.

[5FDP]

GM E38 ECM and Fuel Injectors, TFX™, 120 Lbs./Hr., Bosch-Style, 2.2 Ohms Impedence, Jetronic Plug, Universal, Set of 8.

Okay but what GM E38, they put those in tons of vehicles and not all are the same.

The early ones like in a corvette or a G8 or GM truck can only handle so much injector before needing to scale. Any of the computers from like 2010+ got a larger limit.

[scottt28]

Okay but what GM E38, they put those in tons of vehicles and not all are the same.

The early ones like in a corvette or a G8 or GM truck can only handle so much injector before needing to scale. Any of the computers from like 2010+ got a larger limit.

The ECM/original tune is for a 2009 Chevrolet Express van VIN 86YSYSK25288SFAP. Does that help?

[5FDP]

To me, no as I don't have the file to view.

But if you do, just look at and hover the mouse over the injector flow rate table. It will either say 63.5 or 127lbs/hr for the size of the injectors it can work with.

[scottt28]

To me, no as I don't have the file to view.

But if you do, just look at and hover the mouse over the injector flow rate table. It will either say 63.5 or 127lbs/hr for the size of the injectors it can work with.

And THAT is a great little piece of advice. 127 lbs. I am golden. Thanks!

[schpenxel]

Assuming they are rated at the fuel pressure you're running. If they're rated at 3 bar and you're running 4 then you'll be over

[scottt28]

Assuming they are rated at the fuel pressure you're running. If they're rated at 3 bar and you're running 4 then you'll be over

I'm told that Holley/Accel/TFS 120lb injectors are the same... and they flow 120 lbs at 43 lbs fuel pressure. I'm using a 3bar MAP and I can't imagine running more than 3 bar of boost. I'll probably be running around town with 6-8 pounds of boost. The trans is only rated to 700 ft lbs, so I don't want to push it until I get some billet shafts etc.

[schpenxel]

Totally different things. Of course you aren't running 60 psi of boost, lol

GM typically uses 4 bar fuel pressure, i.e. 58psi. which turns those [email protected] fuel pressure into ~138lb/hr injectors @ 58psi

[scottt28]

Totally different things. Of course you aren't running 60 psi of boost, lol

GM typically uses 4 bar fuel pressure, i.e. 58psi. which turns those [email protected] fuel pressure into ~138lb/hr injectors @ 58psi

These injectors are rated at 120lbs @ 43.5 psi fuel pressure. I called TFS.... they said "call Holley because they are the same injector"... which I thought was pretty crappy customer service. It seems the SOB was too lazy to check into it and I will remember it.

So I called Holley... the guy that picked up the phone said he has asked the engineering guys for injector flow rates @ various voltages and offsets and never been able to get them. Again, I thought this was pretty crappy customer service. It seems that they sell the stuff, so they ought to have the data.

Right now, it seems I'll be running these injectors at 43.5 psi - leaving all of the offsets as they are now.

[veee8]

Buddy I'm telling you this again, those injectors are 2.2 ohm a.ka. low impedance. Your ECU will only drive high impedance injectors without an injector driver box (which I don't recommend)
You will be much further ahead to return those injectors and pony up for ID850's or larger, with real usable data that are high impedance designed to work with your stock ECM.

[scottt28]

Buddy I'm telling you this again, those injectors are 2.2 ohm a.ka. low impedance. Your ECU will only drive high impedance injectors without an injector driver box (which I don't recommend)
You will be much further ahead to return those injectors and pony up for ID850's or larger, with real usable data that are high impedance designed to work with your stock ECM.

Roger that.

Anybody got an opinion on FIC 1100s versus Deatschwerks 1200s?

http://fuelinjectorclinic.com/ls3-ls...99/IS303-1100H

http://www.deatschwerks.com/products...tors-20-detail

[SilverBullet6.0]

I use Fuel Injector Connection exclusively and have had no issies