Spooling the turbo with timing.
I recently installed a T7675 on my 6.0 litre and am trying to tune for a good spool. It looks like timing in the 30 degree range helps spool the turbo faster. Can someone look at my tune and make some recommendations to perhaps the timing or Boosted timing table.
Thanks!
Last edited by jamesbond2509; August 13th, 2014 at 12:00 PM.
2002 GMC Sierra ECSB
Turbonetics T7675 6lbs boost, 42lb injectors, Single 4 inch exhaust with Hi-Flow Cats, 6.0 swap, Comp Cam LS9 Cam, EFIlive Tune, E-fans, Snow Performance Meth Kit, soon to add KB Boost a Pump,
I hope that isn't your current tune ?
Wide open throttle timing is pretty high for a std bottom end engine, on pump gas, with boost.
also you have no power enrichment, commanding 14.63 afr in PE (not safe on a boosted engine)
Back yard boost
347+ T76 = 770 rwhp10.96 @ 135 mph
I would half that spark map for a start and go from there.
Yeah it is my current tune, however previously used for a blower and it is speed density. I usually run 94 octane and have not had any problems with knock. I will try lowering the WOT timing - It is around 18, how much lower should I go.
Last edited by jamesbond2509; August 13th, 2014 at 12:34 PM.
2002 GMC Sierra ECSB
Turbonetics T7675 6lbs boost, 42lb injectors, Single 4 inch exhaust with Hi-Flow Cats, 6.0 swap, Comp Cam LS9 Cam, EFIlive Tune, E-fans, Snow Performance Meth Kit, soon to add KB Boost a Pump,
I find from observation that the turbo seems to spool very well at 25-30 degrees of timing until I hit boost. Anyone able to post their timing tables?
2002 GMC Sierra ECSB
Turbonetics T7675 6lbs boost, 42lb injectors, Single 4 inch exhaust with Hi-Flow Cats, 6.0 swap, Comp Cam LS9 Cam, EFIlive Tune, E-fans, Snow Performance Meth Kit, soon to add KB Boost a Pump,
Aug 10 2014 Turbo_0001.tun
Have modified you tune file with my timing tables, check history to see what i've done.
Back yard boost
347+ T76 = 770 rwhp
Hi John, Thanks a lot, appreciate your help very much. I'm going to try it and report back. I was also wondering if I could have a look at your VE tables since I just changed over to a turbo and need a starting point for tuning. Thanks again
2002 GMC Sierra ECSB
Turbonetics T7675 6lbs boost, 42lb injectors, Single 4 inch exhaust with Hi-Flow Cats, 6.0 swap, Comp Cam LS9 Cam, EFIlive Tune, E-fans, Snow Performance Meth Kit, soon to add KB Boost a Pump,
Aug 10 2014 Turbo_0002.tun
Here you go.
Note - I run 60 lb injectors, non boost referenced fuel regulator, and also have a larger camshaft than you run, so no too sure if my VE table will a close match for your setup.
Back yard boost
347+ T76 = 770 rwhp
Hi John Thanks again, at least it is a starting point. I have to get emissions first then I'll try this as a starting point for tuning.
Best Regards
2002 GMC Sierra ECSB
Turbonetics T7675 6lbs boost, 42lb injectors, Single 4 inch exhaust with Hi-Flow Cats, 6.0 swap, Comp Cam LS9 Cam, EFIlive Tune, E-fans, Snow Performance Meth Kit, soon to add KB Boost a Pump,
Hi John, the tables were good as starting point - eventually I have to add a 20% factor to ensure I didn't go lean in the Boosted. The timing table worked out well - Thanks again.
PS is this your high horsepower tune?
2002 GMC Sierra ECSB
Turbonetics T7675 6lbs boost, 42lb injectors, Single 4 inch exhaust with Hi-Flow Cats, 6.0 swap, Comp Cam LS9 Cam, EFIlive Tune, E-fans, Snow Performance Meth Kit, soon to add KB Boost a Pump,
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