Setting Turbo Boost with boost foolers

[rammertide07]

Originally Posted by ChrisCNC

I do have a nice CNC machine that is quite capable of making sweet modifications...no grinding here!

I'm jealous. I've tried talking my dad into buying a CNC machine. But he's got a guy in Georgia, south of Atlanta, that has all the high tech CNC machines and a 3D printer.

[cleatus12r]

There have been a couple folks who have looked into going with an actual 3 or 4 bar MAP sensor and then scaling the voltage-to-PSI functions in the PCM to accurately reflect actual boost above 25 PSI. However, that really would only come into play with stupid-huge injectors that need an accurate boost-to-fuel relationship for good driveability under low boost conditions and then accurately control mid-and high boost fueling as to not "choke out the fire". For stock-ish trucks that make less than 500 HP and have stock-ish turbo setups, the stock MAP sensor gets the job done.

[ChrisCNC]

If I had more time, I'd like to make some mods but right now I'm buried (with CNC work). I'm planning on going to the local junk-yard and getting an F250 outside door handle so I can get a pattern to make some solid aluminum ones and then have them chromed. Plus like you mentioned, it'd be easy to make a wastegate that runs solely off of drive pressure like the T.M.. Lots of things but gotta keep the customers happy first!

-K

[ChrisCNC]

Cody,

That makes sense, I would assume that trying to nail daily driving with big injectors (and underpowered fuel pressure) would be a headache for you.

That kinda brings up a question for me, for a stock-ish truck (like mine for instance) of all the turbo's you've dealt with, is there a turbo or turbo mod (compressor wheel) that stands out to you as having a well matched boost map? maybe a particular combination of turbos and wastegates?
Or maybe to put it another way, it there a turbo setup on a stockish truck that you enjoy dealing with because its map range "just fits" the needs of the engine? (i.e., you look like a hero! ) If you were going to swap out a turbo, what ones would you be looking at...wastegated or not wastegated? maybe that's an issue for a separate thread...

Didn't you get a project truck a while back? What are your plans with that? I'd like to get a good 7.3 block and build it up over time, but with my tastes ($$$) the first thing I'd want are billet rods and they're EXPENSIVE. I keep wanting to do stuff to my truck but don't want to go much over 400HP simply because of the PM Rod issue. Got a friend here that went about 475 with forged rods and he perforated his block. On the other hand, my brother-in-law is over 500 with his truck (estimate) and he's got PMR. I don't have the cash to gamble like that...

-Kevin

[ChrisCNC]

Ever deal with these guys? pretty good sounding MAP sensor, at least on paper...

5 BAR / 75PSIa MAP Stainless Sensor Kit (30-2130-75) [30-2130-75] - $163.35 : Muscle Motors - AEM Power Distributor!, Got Muscle?

[907DAVE]

Cody, can you verify that the Low Boost Fuel map acts as a limiter and not as a delay?

I have not been very successful when trying to control fueling with this map.

[cleatus12r]

I wrote up a HUGE story on that yesterday evening, Dave, but when I hit "post quick reply" a database error showed up and ruined my night.

I'll retype it at some point today for you.

Have any luck with those normalizers yet?

[907DAVE]

Not yet, been on the road since Friday evening. Plan to hit it hard early
next week.

[cleatus12r]

Originally Posted by 907DAVE

Cody, can you verify that the Low Boost Fuel map acts as a limiter and not as a delay?

I have not been very successful when trying to control fueling with this map.

I'll get some datalogs when I go to town today. I decided that typing something out and hoping that it makes sense would be inferior to actually SHOWING what's going on there.

[907DAVE]

Originally Posted by cleatus12r

I'll get some datalogs when I go to town today. I decided that typing something out and hoping that it makes sense would be inferior to actually SHOWING what's going on there.

Any luck with this?