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Modding the Supercharged 3800 for Dummies

l67 gtp modding pulleys m90 regal gs

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#41 Imp558

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Posted 11 June 2017 - 03:32 PM

It would be cool to have a really good guide on tuning, Shawn did a write up a while back but it assumed the reader was familiar with the software.

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#42 digitaloutsider

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Posted 11 June 2017 - 03:51 PM

I would love if someone with a lot of tuning experience would sit down and write us a guide. But you're usually gonna run into someone who only uses DHP or only uses HPT and doesn't know how to translate between the two.

 

A lot of the "tuning guides" and "tuning notebooks" that exist out on the Internet are extremely outdated or wrong. For example, both Gary's Guide and Jerry's Notebook reference doing VE tuning. VE tuning is a complete waste of time (outside of having a failsafe tune on an extremely modified car to get home if the MAF dies) because of how the 3800 PCM calculates fueling. Tuning a car for VE is extremely time consuming, wastes gas, and produces zero benefit. So the recommended starting place by most "expert" tuners is to start with MAF tuning. And even then you'll have people who debate whether or not you should touch the MAF table (Editor's note: A MAF tune was absolutely necessary on my car, I saw no other way around getting fueling right). Another example: neither of these guides discuss lowering the KR enable temperature, which in 2017 is known to be an important step before you accidentally make the engine go boom because GM set the original temp too high.

 

Then there are people who are fluent in GM LS PCM tuning and try to apply that knowledge to the 3800 PCM. Same for people who studied Greg Banish's book over and over. Greg's shit is SPOT ON for LS tuning, but sadly much is useless for ours. For example, if you want to tune an LS car to run E85, you literally change one table that references the stoich number of the fuel. That's it. You're done. In HPT for 3800s, that field exists. Except it doesn't do anything. Little things like that are what make tuning our cars difficult because everything is a little tidbit of knowledge or a trick or workaround and no one seems to know them all. You have to read every single bit of information you can and try to figure out how it applies to you. I spent more time than I care to admit just comparing BIN files to try and figure out why some changes were made.

 

At the end of the day, I think a lot of 3800 tuning is guesswork or working off of "known best practices" and hoping for the best, hence a lack of any real updated tuning guides.


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Shaun 

   

2001 Buick Regal GS Supercharged 3.8L 231ci Pushrod 90º V6 | 4T65E-HD  

Gen V M90, 2.9", 1.9 RRs, 60lb injectors, E85, F&R Powerlogs, 3" DP, 3" stainless exhaust, Intake, 104s, 180° t-stat, Rendezvous HUD, Blacked-out headlights, Tint, F-body brakes, F&R GMPP sways, Tuned. 

 

1998 Jeep Grand Cherokee 5.9 Limited 5.9L 360ci Magnum Pushrod 90º V8 | 46RE | NV249  

Flowmaster 50 SUV muffler, 180° t-stat, CAI, 8.5mm wires, does sick burnouts.

 

"Ed, you don't have time to turn the J-car into a Cadillac.." - Peter Estes


#43 carkhz316

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Posted 11 June 2017 - 05:41 PM

That is a good call out, at some point I need to try and compile that data (alternator mounting, vacuum line routing, etc) between the years. 

 

As for the tune, those are massive negative LTFTs. Do you have a wideband? Stock injectors and MAF? What mods?

No WB, but I'm running stock L67 injectors and 99+ MAF and throttle body. Aside from the top-swap, the only mods are FWI, and 284 swap. I can post/ email my HPT file if that would help.


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#44 bluegtp91

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Posted 12 July 2017 - 08:06 PM

OP:  You're the first one ever to actually site where it came from and give me credit (even though I know the post is like eight years old); I appreciate it.

 

Also:  Hi people.


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1999 Chevrolet Silverado K1500 Classic Z71 - Intake/Gibson Exhaust - The Daily  
2004 Chevrolet Corvette MRM A4 - AFE S2 Intake/TSP Catless LT's/3" ORX/C6 ZR1 Wheels/Exhaust Tips
Sold W-Body's: '98 GT, '98 GTP, '00 GTP, '03 GTP, '05 GXP
 

#45 digitaloutsider

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Posted 13 July 2017 - 01:19 PM

Hey man, good to see you around here! But it's no problem at all.. I've had enough people hijack my shit over the years. I wouldn't do that to someone else.


Shaun 

   

2001 Buick Regal GS Supercharged 3.8L 231ci Pushrod 90º V6 | 4T65E-HD  

Gen V M90, 2.9", 1.9 RRs, 60lb injectors, E85, F&R Powerlogs, 3" DP, 3" stainless exhaust, Intake, 104s, 180° t-stat, Rendezvous HUD, Blacked-out headlights, Tint, F-body brakes, F&R GMPP sways, Tuned. 

 

1998 Jeep Grand Cherokee 5.9 Limited 5.9L 360ci Magnum Pushrod 90º V8 | 46RE | NV249  

Flowmaster 50 SUV muffler, 180° t-stat, CAI, 8.5mm wires, does sick burnouts.

 

"Ed, you don't have time to turn the J-car into a Cadillac.." - Peter Estes


#46 bluegtp91

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Posted 13 July 2017 - 04:37 PM

Hey man, good to see you around here! But it's no problem at all.. I've had enough people hijack my shit over the years. I wouldn't do that to someone else.

 

Gimme a holler if you need anything; PM's usually work since I'm still trying to fix GPF after Devil's Own basically told us to take a hike.  I'd have no problem shooting advice to people around here, too.

 

However...the Corvette takes up a lot of the free time lol


1999 Chevrolet Silverado K1500 Classic Z71 - Intake/Gibson Exhaust - The Daily  
2004 Chevrolet Corvette MRM A4 - AFE S2 Intake/TSP Catless LT's/3" ORX/C6 ZR1 Wheels/Exhaust Tips
Sold W-Body's: '98 GT, '98 GTP, '00 GTP, '03 GTP, '05 GXP
 





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