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I'm just finishing up tuning my car after getting a double pumper and was curious how much boost most people target with an HTA 73 Green? I've been seeing good gains adding boost up to around 31 psi but feel like I might be reaching where the turbo is getting less efficient so wanted to see what everyone else with this turbo has discovered.
I have stock block and S3 cams also by the way. Below what RPM do I really need to watch the torque on stock block?
Ooops. I'm a bit off then. I was under the impression that it was the torque spike at lower RPMs that did the rods in. I'm delaying torque but am hitting a decent bit over 400 after 5k.
Thanks. I was just trying to squeeze extra power out of it at higher RPM but was hitting 420-440 tq around 6k. Power began to fall off later on so lowering torque here should make for a flatter torque curve anyways. The 500+ whp number was cool but don't want to break a rod.
That's what I'm doing. I was actually just tuning WGDC on a 4th gear pull and let the boost build too early and my stock clutch finally gave out. Might have saved my rods though so I'm looking at it that way. That and now I can finally launch the car after I get a new clutch.
+1 for 400 ft-lbs being a safe limit for a good tune. however, destruction is mostly the result of an unexpected lean condition due to fuelling issues. don't skimp on fuel system parts or installation. also, too much timing can bend rods even at low torque levels. tune for minimum timing for best power, and then back off 1-2 deg. do not tune for knock on e85. you'll never see it.
Thanks for the help guys. I dropped my boost and timing where my torque was hitting a high around 6k and picked up a little below that. I'm tuning for a flat 400 torque curve and not paying so much attention to horsepower numbers now. I just want a safe tune. I'm running fairly low timing already until the top end and I kept gaining power when adding it.
I'm only 2* at 4k, 5* at 5k, 9* at 5500, 11* at 6k, 14* at 6500, 15* at 7k, 17* at 7500, and 19* at 8k.
I guess this might need tweaked a little because I dropped boost and am adding it back to get to 400 torque as soon as I can and not pass it. Should I lower timing in places to keep a flatter boost curve and stay at 400 torque or just keep my timing around where it's at and ramp up the boost at higher RPM?
When people talking about timing at peak torque I don't get what's considered peak torque? Is it peak boost or when you first hit your highest torque?
Where would you consider my peak torque on this pull? That was when I was still working out rich spots after installing my double pumper so I took care of that to stay mid to high 11s but this was just the first log I found from what I know was a flat road when I was running more boost.
10.5 MHI. I think I ended up picking up boost a little earlier and holding it a little longer even. When I get the tune done for holding 400 torque as long as possible I'll post a graph in the dyno section. I think I can add a little timing in the 4k area to pick up boost earlier. In 4th through 6th gear I can build boost so much faster but in lower gears I would like a little quicker spool. I had lower WGDC in 4th but still built 38 psi just past 4k before when I was afraid I fried my clutch. I dropped the boost and am up to around 350 tq now in 3rd with no slipping.
I don't think I tried building much more boost down low before. Was just testing after trying to build boost lower when I boosted too much in 4th and my clutch slipped really bad. After that I dropped the boost back down and have been building back up from there. It's actually helped me tune some load areas I never hit before so it works out. I'm still on stock clutch and 6 speed by the way.
