How do you get high Boost

[ranvette]

I hear you !!!!!!!!!!!!

 

[ripper806]

I'm at altitude so my boost is usually up there. :/

I'm with you, my max boost is always 23 at the strip, and I am at 3,602 elevation.

You may be the only other owner who can feel my pain at the strip lol

My lowest altitude density at the track was 6,000, we have horrible air in Amarillo. I believe our best ET's are over looked because of our home track elevation, and AD.

 

[sx sonic]

My max boost is 23psi at 1k ft

 

[ripper806]

how do you get more boost with a tune. Does the tune control your waste gate or is it mechanically rigged to not open. Looks like unless my meter is miscallibrated I am only getting 14 psi. max. I will check with the Bulley Dog people on Monday and see if that is all I should be getting. I don't want to rig my waste gate closed to find out my gage it off by 50%.

Have you run it at a local drag strip? If not I guess the question is what are all of your mods?

I'm not saying that anyone is incorrect about different elevation's causing a difference in boost pressure to the engine, I just believe that your parts setup is the key as well as your tune.

 

[Swordsmith]

Can you read your torque output? If you're getting 200 TQ then it doesn't really matter how that's happening. I have to wonder if it's a feature of the Bullydog gauge, whether their "14psi" is somehow the same as the "22psi" on an ultraguage. Can you borrow someone's UG to see if you get the same results there? That way we'd be comparing apples to apples.

That said, my stock tune topped out at around 14psi, while Trifecta tune with gasoline ran as high as 22 psi... and running E85 I now top out under 20psi. The stock tune never got close to 200 ft/lbs of torque, but E85 hits that regularly... to the extent that I suspect either my ultragauge refuses to show more, or that Trifecta coded a hard limit at 199.9.

To hit that high boost, I put the (torque demand) pedal to the floor and don't let it up, running my RPM's up until just before the nanny kicks in (at around 6500 RPM). Boost starts below zero, rapidly builds up and then stays up until I let up again.

I haven't been doing NLS for quite some time, but when I did, the boost stayed right around peak while I shifted. Now, each shift I dump and have to rebuild... but since I don't actually have to shift past third, that's just 1-2 and 2-3 shifts anyway.

 

[ripper806]

My max boost is 23psi at 1k ft

This would make me think that his tune, as well as his mods setup are holding him back a little. Bully dog may also not have given him a very aggresive tune.

Many of my buddies at the track that run at many different tracks at various elevations, say that they see the same boost levels from track to track. The only things that create a difference in ET's are altitude density, and track prep.

 

[klystron]

Why certainly.

"Boost" is a cute racer term that means air pressure above that of barometric. It is actually a measure of a restriction in the path of airflow. Typically the only restriction you want to be in the path of airflow is your engine. However if you replace your charge pipe (the pipe after the turbo) with a drinking straw, you will have a huge restriction and make a ton of boost (but no power.)

It's been discussed on this forum before that people with Trifecta tunes (in the days before HPTuners) will get other mods like intakes and exhausts or manifold ports and see their max boost numbers drop and not understand why. The reason is because there is now less restriction in the system and so the same airflow can be obtained while measuring less boost.

Many people do not understand the difference between boost and airflow. Airflow is a function of volume. In order to make power over time you need some amount of airflow. If your engine flows 100 CFM (cubic feet per minute) of air to make 200 horsepower while measuring boost at 10 psi, and then you get a bunch of mods to make it flow better, you can flow 100 CFM to make 200 horsepower at 8 psi.

The point of this is that boost does not make power... airflow does! So since our cars are programmed for some specific output torque and you make the system more efficient it will continue to make that same output torque with less boost (but same airflow, unless your mods are making the engine internals more efficient.)

TL;DR it's a boost thang baby

It's been almost a year later and I just noticed that I said "people with Trifecta tunes" but I think I meant "people without Trifecta tunes." The stock tune will lower boost to meet demanded torque, but I think the Trifecta tunes do away with that mechanism.

 

[ScarabEpic22]

It's been almost a year later and I just noticed that I said "people with Trifecta tunes" but I think I meant "people without Trifecta tunes." The stock tune will lower boost to meet demanded torque, but I think the Trifecta tunes do away with that mechanism.

The way the ECM is structured this is not possible. However, you (as in tuner) can raise the demanded TQ value above what the engine can possibly deliver so it will not use limiter. Boost will not be reduced so the ECM can meet it's desired TQ as desired TQ is always higher than what the ECM delivers.

 

[klystron]

The way the ECM is structured this is not possible. However, you (as in tuner) can raise the demanded TQ value above what the engine can possibly deliver so it will not use limiter. Boost will not be reduced so the ECM can meet it's desired TQ as desired TQ is always higher than what the ECM delivers.

He wrote his own software. Maybe based on something else and maybe from scratch. Who knows.