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6.5/6.2 High Performance Engine Modifications High Performance Turbocharger and Engine Related Modifications Discussion Forum - Specific To The GM 6.2 & 6.5 Diesel Engine.

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Old 12-28-2014, 01:18 AM   #1 (permalink)
90GMC62L
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'95 GMC 2500 build thread for power/reliability

Well I figured I would post up a thread to document the things I do to my truck for my own use as well as maybe give others ideas as well. I know you guys like pictures and so do I so I will try to keep those up as I do things.

Goals:
better towing
better power
better reliability


I'll introduce you to the truck first


EXHAUST:

First mod I did right away was Diamond Eye 4" exhaust no muffler. Install was as easy as it can get. Cutting out the old took an hour longer than just installing the new. All said and done, doing it alone, it took about 4 hours.
Didn't take a lot of pics but here it is new in box. Also added a 12x5 stainless tip.




Besides little maintenance items and a "cold" air intake, I haven't done much else to in the year and a half i've had it besides cosmetic things. Now it's time for power.

FUELING

This is where i'm at right now, doing my own personal "feed the beast" mod. I will update as I make progress on it.

I didn't buy the actual kit because i'm also deleting the stock filter setup and really just need the I.P. fittings which I sourced myself.

The I.P. fitting is just a standard -4 AN (I.P. side) to -6 AN (fuel feed) adapter.


Unfortunately the -4 AN end gets smaller and needs to be opened up to match the -6 AN side.



I didn't measure the I.D., I just matched a drill bit to the size and ran it through my drill press.


Much better


The lower I.P. fitting needs opened up as well on the 4 outlet holes. It's a tough metal but nothing my carbide bit couldn't handle.

Fittings in stock form. There is a stainless mesh screen that surrounds the holes but I ruined it trying to remove it. Luckily I have spare pumps laying around so I will replace it since I know how it comes off now.



Starting the enlarging process



All done, just have a few burrs to clean up.


For filtration, i'm using an '82 6.2 diesel primary filter housing. Already has a bleeder on top and uses 3/8" inlet and outlet. The spin on filter also has a water drain. Since I live where it gets cold, i'm buying a filter heater just in case. Doing this mostly for easier access and better filtration.




Items on the way:
Walbro FRC-10
Filter and I.P. fittings
Braided hose

This is where i'm at so far, stayed tuned.

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Aaron

1983 Silverado K10 RC/LB 305 700R4 119K miles:
1993 Formula Firebird LT1 6-speed. 119K miles:
1995 GMC K2500 LB/EC 6.5L 4L80E 167K miles:
DE 4" no muffler exhaust, OBD-I high idle mod, 285s, Walbro FRC-10 lift pump, Custom FTB mod, stock FFM delete, '82 6.2 Diesel fuel filter setup with filter heater.
2002 Chevy 2500HD Duramax/ZF6 CC/SB
Link to my build thread ----> https://www.dieselplace.com/forum/63-...liability.html
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Old 12-28-2014, 01:29 AM   #2 (permalink)
turbonator
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nice write-up so far, and good guide for doing the FTB mod, you know where i will be sending anyone who asks about it from now on...... nice pics too..

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Building power "Sanford and Son Style"

1998 gmc 3500 RCLB/4X4, 4L80E, DB2 converted, 6.2l #599 casting, bored .040", water-cooled garrett gt3271G turbo, CTS manifold, j-code intake, .290" IP, delphi injectors popped to 2300PSI with modded tips, 3" D.P., aero stainless muffler, triangle tip side pipe, Holley Red lift pump @ 5PSI, canton racing oil filter delete, remote filters, custom 5000psi gates oil cooler lines, over-sized long oil cooler, over-sized hayden tranny cooler, other than that its a "stock" engine....


acolytes of the "aggressive buddist's" principles since march 13th 2014
jim&jeff....
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Old 12-28-2014, 01:32 AM   #3 (permalink)
turbonator
respect the DB4 5722....
 
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also, if you want to use a bit cheaper filter, get your self an oil filter from a 1995 jaguar, its the same threads as the AC head, and they only cost $4.50, no water separator, but it is easy to screw on and off, and pretty much BTU feed for our shop woodstove.... for us its a viable alternative, as the 6.2l filters here cost us $27.00 each...
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Building power "Sanford and Son Style"

1998 gmc 3500 RCLB/4X4, 4L80E, DB2 converted, 6.2l #599 casting, bored .040", water-cooled garrett gt3271G turbo, CTS manifold, j-code intake, .290" IP, delphi injectors popped to 2300PSI with modded tips, 3" D.P., aero stainless muffler, triangle tip side pipe, Holley Red lift pump @ 5PSI, canton racing oil filter delete, remote filters, custom 5000psi gates oil cooler lines, over-sized long oil cooler, over-sized hayden tranny cooler, other than that its a "stock" engine....


acolytes of the "aggressive buddist's" principles since march 13th 2014
jim&jeff....
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Old 12-28-2014, 01:35 AM   #4 (permalink)
90GMC62L
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Quote:
Originally Posted by turbonator View Post
nice write-up so far, and good guide for doing the FTB mod, you know where i will be sending anyone who asks about it from now on...... nice pics too..
Thanks Turbonators!

That's my goal is to document as much as possible so others can benefit as well. And since I plan on doing all the common mods, this will be a good place for people to see how some of them are done.
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Aaron

1983 Silverado K10 RC/LB 305 700R4 119K miles:
1993 Formula Firebird LT1 6-speed. 119K miles:
1995 GMC K2500 LB/EC 6.5L 4L80E 167K miles:
DE 4" no muffler exhaust, OBD-I high idle mod, 285s, Walbro FRC-10 lift pump, Custom FTB mod, stock FFM delete, '82 6.2 Diesel fuel filter setup with filter heater.
2002 Chevy 2500HD Duramax/ZF6 CC/SB
Link to my build thread ----> https://www.dieselplace.com/forum/63-...liability.html
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Old 12-28-2014, 01:39 AM   #5 (permalink)
90GMC62L
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Quote:
Originally Posted by turbonator View Post
also, if you want to use a bit cheaper filter, get your self an oil filter from a 1995 jaguar, its the same threads as the AC head, and they only cost $4.50, no water separator, but it is easy to screw on and off, and pretty much BTU feed for our shop woodstove.... for us its a viable alternative, as the 6.2l filters here cost us $27.00 each...
Awesome! I forgot how much they cost since I sold my '82 a few years ago. I can get them for about $21 but that's still more than i'd like. Thanks for the suggestion.

I also have another '82 Filter head and thought about using that one as a pre-lift pump filter.
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Aaron

1983 Silverado K10 RC/LB 305 700R4 119K miles:
1993 Formula Firebird LT1 6-speed. 119K miles:
1995 GMC K2500 LB/EC 6.5L 4L80E 167K miles:
DE 4" no muffler exhaust, OBD-I high idle mod, 285s, Walbro FRC-10 lift pump, Custom FTB mod, stock FFM delete, '82 6.2 Diesel fuel filter setup with filter heater.
2002 Chevy 2500HD Duramax/ZF6 CC/SB
Link to my build thread ----> https://www.dieselplace.com/forum/63-...liability.html

Last edited by 90GMC62L; 12-28-2014 at 01:41 AM.
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Old 12-28-2014, 11:53 PM   #6 (permalink)
90GMC62L
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Made a little progress today. Painted up the filter housing and went shopping for some more fittings, hose, O-rings, clamps, and my filter. The 6.2 Purolator filter is a little cheaper than the 6.5 version by a few bucks, actually got it for $14.




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Aaron

1983 Silverado K10 RC/LB 305 700R4 119K miles:
1993 Formula Firebird LT1 6-speed. 119K miles:
1995 GMC K2500 LB/EC 6.5L 4L80E 167K miles:
DE 4" no muffler exhaust, OBD-I high idle mod, 285s, Walbro FRC-10 lift pump, Custom FTB mod, stock FFM delete, '82 6.2 Diesel fuel filter setup with filter heater.
2002 Chevy 2500HD Duramax/ZF6 CC/SB
Link to my build thread ----> https://www.dieselplace.com/forum/63-...liability.html
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Old 12-29-2014, 12:00 AM   #7 (permalink)
JorgeNY
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Very nice truck. It's in great shape!
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Old 12-29-2014, 12:55 AM   #8 (permalink)
sportsman7
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x2, beautiful truck! nice work too, good FTB info.
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Old 12-29-2014, 01:44 AM   #9 (permalink)
90GMC62L
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Thanks all I couldn't pass the truck up when I found it on craigslist last year, that color scheme is awesome I think. It had 145K miles on it, no rust and had been sitting for 5 years because of a bad trans. I paid $1500 for it and got the trans rebuilt, all new brake lines, fuel lines, new tires, dmax wheels and now 13K miles later, this is where i'm at. Been a great rig so far.
__________________
Aaron

1983 Silverado K10 RC/LB 305 700R4 119K miles:
1993 Formula Firebird LT1 6-speed. 119K miles:
1995 GMC K2500 LB/EC 6.5L 4L80E 167K miles:
DE 4" no muffler exhaust, OBD-I high idle mod, 285s, Walbro FRC-10 lift pump, Custom FTB mod, stock FFM delete, '82 6.2 Diesel fuel filter setup with filter heater.
2002 Chevy 2500HD Duramax/ZF6 CC/SB
Link to my build thread ----> https://www.dieselplace.com/forum/63-...liability.html
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Old 12-29-2014, 01:50 AM   #10 (permalink)
90GMC62L
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Just remembered, I should have taken pics of the OBDI high idle mod. Maybe I can snap some this week even though I already finished it.

Also for 92-95 trucks, I did a VSSB mod to correct my speedometer for the 285s, i'll get that info up as well.

__________________
Aaron

1983 Silverado K10 RC/LB 305 700R4 119K miles:
1993 Formula Firebird LT1 6-speed. 119K miles:
1995 GMC K2500 LB/EC 6.5L 4L80E 167K miles:
DE 4" no muffler exhaust, OBD-I high idle mod, 285s, Walbro FRC-10 lift pump, Custom FTB mod, stock FFM delete, '82 6.2 Diesel fuel filter setup with filter heater.
2002 Chevy 2500HD Duramax/ZF6 CC/SB
Link to my build thread ----> https://www.dieselplace.com/forum/63-...liability.html
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