Pavetim

iTrader: (15)

I've done sd tunes before but it's been awhile and never on a total conversion. I am swapping an lq4 into my 98 chevy truck. I'm using a 2001 silverado dbc harness and a 411 pcm. Now if I want to go SD on this truck I know you leave the MAF out, but do you also leave out all the O2 sensors also? I will most likely either be having somebody tune for me or buying efi live and a wideband kit. Anything else I can leave out with a sd tune?

code4

iTrader: (30)

I am doing the same thing in a 54 chevy p/u right now. I completely removed all wires from the pcm for all four o2's and the maf.

I do my own tuning is speed density using a wideband sensor. Once done, I run it that way. This is on a 2bar (boosted) setup but it works the same as naturally aspirated.

We removed tons of wires. I am using my injectors & coil wires, tps, iat, iac, crank & cam sensors, ect & auto trans wires, then 2 wires to power the pcm, some grounds & the wires for the obdII port. That's it, the rest went in the garbage.

This is for an old rat rod & doesn't need much. I haven't figured out my gauges yet & other misc wiring.

code4

iTrader: (30)

Oh I forgot we wired in a fan & fuel pump activation off of the pcm. Maybe I am forgetting other wires? Ha Ha.

But we got rid of a lot of wires.

sssalah

I'm running SD because I can't use a maf due to space ristriction. Still using the front O2 sensors on for closed loop operation.

racecar

SD tune is no MAF. You need the front O2 sensors if you want to run in closed loop.
Open loop is OK for race cars, but it is usually pretty rich for the street. you don't need the rear O2. You can tune the software to not look for those, they have no affect on how the car runs, they verify that the catalic convertors are working.

billy.johnson

iTrader: (5)

SD tune will give you a little bettere throttle response if tuned right.

99T/AVert

iTrader: (5)

In for info

Dragman

I run OLSD tune on street and my C5 does not run rich!

Doc

iTrader: (9)

!Evap, !EGR if fitted.

01SOMZ28

iTrader: (37)

Can most dyno shops do an SD tune? I'm a noob and i want to get rid of the MAF, so any info on this would be helpfull.

TransAmatt99

iTrader: (24)

I still use the 02's on my SD tune, runs great much better than with the tuned maf setup.

Doc

iTrader: (9)

Hey Lincoln! That's my home town. Sadly, most dyno shops don't / can't / won't do a SD tune. We do tuning for what the application calls for- SD and or MAF.

Doc

moehorsepower

iTrader: (3)

If you have a shop that's not super busy and a good tuner then they will probably do the SD tune. But it does take time to get it right so in effect for a busy shop its not cost worthy to tie up the dyno for hours and hours, unless they are charging you by the hour, then it will be expensive for you. Back in the day when you had to erase a factory SD chip car (93's) it took app 30-40 minutes to erase the chip. We charged for a dyno tune and not by the hour. With cars lined up waiting for a tune, it took too much time and it was not cost worthy for us, so I stopped doing the 93's...

Frost

iTrader: (45)

I do VE tuning on every car that isn't stock-internals, so SD tuning is actually FASTER for me than full tuning with a MAF too. Honestly, once you get comfortable with VE, it tunes very quickly (except for the guys that are convinced they can do it just fine with trims).

moehorsepower

iTrader: (3)

True, like you say you are very knowledgeable and experienced with VE tuning, That's why I quoted a good tuner could do it. If you do a lot of VE tuning like yourself, then you know pretty much what, where to set parameters...