turbo 3400 tune

[AaronGTR]

With the DHP build your own bud! I wouldn't use any tune you get over the net. Hook up, and log your AFR error. In one 20 min run you can fix most of your fueling problems. One run for stoich, one to confirm your changes, then one or two for WOT and confirm using the MAF error % while you go. I think timing is going to be your biggest factor, not the fueling...
When you put your 36lb injectors in use 4.30grams across the IFR scale with the 3400. These cars don't like a skewed scale in that one.
To start take 10* timing from the whole table and then watch for KR. Remove additional timing to match MAX KR seen, and "add" where there is none. You'll end up much better off than with someone else's tune!

Most of this is good advice, but a lot of the terms and numbers you're using he won't be able to use. The DHP has different names and tables than HPT, ie the IFR table uses different flow numbers so he can't use 4.30grams.

That was info for a V6 OBD2 system...

This is how you tune a V6:

There seems to be allot of methods to tune the AFR on the V6 cars. Since these cars don't yet have an open loop table like the V8's and the V6 (4.3) trucks, the commanded AFR while in open loop is all over the place when not in PE. In PE the commanded AFR will be were you set it.

This is what I found is the best way to tune these cars. First leave the VE table stock. Then zero out the Power Enrichment PE Enable > Delay vs. TPS table (some models will already have this table zeroed out). Set the PE Enable TPS > Hot to 0% (at all rpms). Set the Base AFR vs. ECT to 14.7 at all temps. Zero the Add vs. Tps (note the values in this table add to the Base AFR vs. ECT and leans the AFR). Then zero out the Add vs. Rpm table.

Now install the wideband in place of the stock front 02 sensor, or the right front if a rear drive car (this will put the car in open loop). Flash this new file, then warm the engine to operating temp. Start scanning and reset the fuel trims. Now the commanded AFR will be steady at 14.7. With the Maf AFR histogram open, drive the car at part throttle to fill the histogram up to ~7500 hz. Try to accel & decel smoothly. Then copy & paste the Maf error % histogram to the Maf table using paste special multiply by %. Once you get the AFR close to 14.7, then use paste special multiply by % - half. For the low end of the Maf table that you didn't enter, just enter the error % from the lowest airflow hz cell that you did enter. So by now the part throttle AFR will be ~ 14.7.

Now change the PE Enable TPS back to stock (or were you what it as some models have the low rpm enable at 100%). Change the Base AFR vs. ECT to 13.0 at all temps for NA, or 11.5-11.75 for a boosted engine. Flash this new file, connect the scanner and check & reset the fuel trims. Bring the car to a dead stop, use the VCM controls to put the trans in 2nd gear. Now go wot till your max rpm desired. Then copy & paste the Maf AFR error % to the 7625 hz & higher part of the Maf table. For the freq. hz cells that the scanner skipped over, just average these cells. For the higher freq hz cells of the table that you didn't enter, just enter the error % from the highest airflow hz cell that you did enter. Once you get the AFR close, use paste special multiply by % - half.

Unlike the V8's and V6 trucks, if the part throttle fuel trims are negative by even a small %, you could have negative LTFT at wot. This is why you need to get the open loop part throttle AFR close to 14.7 BEFORE wot tuning the AFR.

When going to wot from a dead stop there will be a lean spike at first (under 7500 hz) that is normal if you first got you part throttle AFR right, this is caused by the split sec. delay for the richer exhaust to reach the wide band.

Now install the stock O2 sensor. If you did everything right, your LTFT's should be close and will lock at 0% @ wot.



Didn't want to scare the crap out of him with info overload, but I guess he will need this...

Where did you get this? Half of this crap is wrong. Especially that first paragraph... of course they have an open loop table. Thats what PE mode is. It enters PE mode at 70% throttle and it's in closed loop mode until then. And you definitely don't want to leave the VE table stock. Basically ignore that enter thing. Follow 3400-95-modified's advice and read the gmv6pcm.com forums when you get your tuner. They will tell you everything you need to know to use that particular software properly. And good luck with the engine and obd2 swap!

[loner666]

loner, jon are yall going to bfest?.... the beretta should be done and ready to rock and roll by june... cant wait fastest beretta award will be mine....lol

if it was in Georgia i would be but because of school i cant make it to Michigan (id have to miss to much school..and you know how expensive that place is..lol)

[rickykline]

if it was in Georgia i would be but because of school i cant make it to Michigan (id have to miss to much school..and you know how expensive that place is..lol)

can you say phase break? lol come on.... all us turbo guys(me you and berettaspeed) need to be there...

[3400-95-Modified]

The nitrous guy wont be at bfest either... I'm gonna be in NJ for my bro's wedding.

I should have won the fastest beretta award last year by times the car run under its current owner... Patrick bought Rex's turbo quad that one day in its life ran a 13.5 and has never yet with him in it, but me on the other hand I've pulled off a 13.9 and a 13.8 so far.... But oh well At least I know my car is fast.

Defaulted to fastest the car had a slip for regardless of owner since the race day was rained out... I was bummed because racing him later in the year proved I would have beat him

[loner666]

can you say phase break? lol come on.... all us turbo guys(me you and berettaspeed) need to be there...

lol..i could but i dunno if i wanna spend anymore time there then i have too..its bad enough that im taking the night class so im already there longer..next BFest ill be at tho hopefully

[IsaacHayes]

Rex's GTZ needs bigger injectors BAD. He had stock ones in there last I saw when it was still for sale and the duty cycle was pretty maxed out! lol. Dunno if the new owner has changed them or not yet. We didn't get to fire it up though as it was in storage and too cold and it didn't want to start for us.