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Old 02-22-2012, 06:19 PM   eBay Motors  #1 (permalink)
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6.5 Engine mods

Ok, We have a 95 3500HD service truck at work that the boss put a 4" turbo back, AFE intake, manual wastegate, and a "module"(as he calls it). It spools well but when you are into it there is very little to no smoke. Turbo is spooling well and quite high, I think, no gauge. The wastegate bolt is pretty tight so I'm not sure what kind of boost it is making. Is there a way to get more fuel in there, I think it may be running alittle lean. Any suggestions would be great. Thanks.
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Old 02-23-2012, 09:26 PM   eBay Motors  #2 (permalink)
 
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id get a gauge hooked up on your boost because anything much over 15 psi with factory turbo is asking for blown head gaskets

you will have to get a different ecm to increase your fuel.
a 6.5 isnt going to smoke like anything else out there. smoke is not necissarily a good thing on a 6.5
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Old 02-24-2012, 10:23 AM   eBay Motors  #3 (permalink)
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I guess I'll have to bring one of my extras over and hook it up. Where would I find a boost reference to tap into? I found out that they installed a new MAP sensor with the chip. I read a couple other posts where guys were concerned their 6.5 was smoking. Guess it is what it is, just drive it, right.
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02 3500 LB7 DRW LS crew cab 4x4.
Mods:Predator, CAI, Straight through Pypes 3.5 muffler, Alcoas
92 GMC Typhoon
13.25 @ 99 mph on stock 113K motor
Mods: 30 over 4.3 ltr V-6, 2.02/1.60 L-35's,20G,
TunerProRT,Moates Software
92 GMC Typhoon
92 GMC Syclone, Ultimate 10n1 chip
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Old 02-24-2012, 10:51 AM   eBay Motors  #4 (permalink)
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I have a 1998 6.5L that i drive almost everyday in the winter and use as a beater farm truck to keep my Duramax shiny. It has a 5 speed manual and 180k miles. It gets decent fuel mileage and never complains. Dont mess with it and drive it haha. The blocks are all cracked and the cranks are a ticking time bomb...more power is just askin for trouble....put the money in the duramax and enjoy haha....

BTW - Mine doesnt smoke when idling but under heavy throttle it will cloud the sky haha
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Old 02-24-2012, 11:28 AM   eBay Motors  #5 (permalink)
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You absolutely DO NOT want a 6.5 to smoke. I have seen plenty of melted pistons because someone wanted their 6.5 to smoke like a Dodge. IDI engines do not tolerate excessive EGTs like newer diesel engines do.

Another word of advice, if he's running a manual wastegate controller, he needs to put a boost gauge on it. As stated before, high boost is a no-no on that engine. Easiest way to install it is with a Boost Bolt from pmdcable.com. It eliminates the need to drill and tap the intake. You want to have it set so you're running 5-6 psi at highway speeds. 15 psi, even under WOT, is a bit much for a non-head studded engine. If that controller is set too high, it won't smoke at all because there's too much air for the fuel being sent in.

Also, need to figure out what this "module" is. With a '95, changing the tune will be with a simple chip replacement, rather than swapping the entire ECM.

FWIW, my 6.5 doesn't smoke a lick, even when I lean into it heavy.
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Old 02-25-2012, 07:01 AM   eBay Motors  #6 (permalink)
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He bought a package deal from US diesel. It was a chip, new MAP sensor, 4" exhaust and an AFE intake. Someone rewired the fuel pump with a new relay. I'm guessing kinda like a "boost-a-pump" set-up.? Truck runs good for a 3500HD, 15k GVW, and a 12' tool body. It prolly weighs @ 10-11 thousand pounds. Too bad it only gets 8-10 mpg, so the boss doesn't let me drive it too often. I love driving it, rides great for a full leaf spring suspension. I checked out that boost bolt. Is the boost reading effected by the fact that the pressure has to travel up the bolt? Kinda silly question, just curious. On my other toys I get boost reference right from a boss on the intake.
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02 3500 LB7 DRW LS crew cab 4x4.
Mods:Predator, CAI, Straight through Pypes 3.5 muffler, Alcoas
92 GMC Typhoon
13.25 @ 99 mph on stock 113K motor
Mods: 30 over 4.3 ltr V-6, 2.02/1.60 L-35's,20G,
TunerProRT,Moates Software
92 GMC Typhoon
92 GMC Syclone, Ultimate 10n1 chip

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Old 02-25-2012, 08:16 AM   eBay Motors  #7 (permalink)
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The boost is not affected by the boost bolt,once pressure is made it is made everywhere in the system.
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Old 03-04-2012, 07:35 AM   eBay Motors  #8 (permalink)
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Ok, got another question for you 6.5 gurus. Like I stated before we have a 95 3500HD,6.5, auto, 15K gvw, 2wd,regular cab, dually. I am wondering if anyone knows the rear ratio that would have been in these trucks. Also what trans are they, 4L80E? It tachs @ 2500 at 60mph, so needless to say the fuel economy sucks, 8-9 mpg. What could we do to get better economy? The boss wants to change the rear ratio but I have told him it will put too much stress on the trans and converter. I would love to get some better economy so the boss will let me drive it more often. I love driving it, rides good and is pretty cool looking. Any suggestions would be great. Thanks guys.
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02 3500 LB7 DRW LS crew cab 4x4.
Mods:Predator, CAI, Straight through Pypes 3.5 muffler, Alcoas
92 GMC Typhoon
13.25 @ 99 mph on stock 113K motor
Mods: 30 over 4.3 ltr V-6, 2.02/1.60 L-35's,20G,
TunerProRT,Moates Software
92 GMC Typhoon
92 GMC Syclone, Ultimate 10n1 chip
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Old 03-04-2012, 10:25 AM   eBay Motors  #9 (permalink)
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Should have come with a 4.10 rear,4l80 trans.
3.73 would help some with economy and not sacrifice much pulling ability.

Find the rpo codes in the glove box and compare to this:
RPO Codes.com: general motors option codes
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Old 03-04-2012, 05:26 PM   eBay Motors  #10 (permalink)
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Quote:
Originally Posted by 92 TY 1173 View Post
Ok, got another question for you 6.5 gurus. Like I stated before we have a 95 3500HD,6.5, auto, 15K gvw, 2wd,regular cab, dually. I am wondering if anyone knows the rear ratio that would have been in these trucks. Also what trans are they, 4L80E? It tachs @ 2500 at 60mph, so needless to say the fuel economy sucks, 8-9 mpg. What could we do to get better economy? The boss wants to change the rear ratio but I have told him it will put too much stress on the trans and converter. I would love to get some better economy so the boss will let me drive it more often. I love driving it, rides good and is pretty cool looking. Any suggestions would be great. Thanks guys.
thats where mine is at, 2500@60 and i believe it has 4:10s in it. 3:73s shldnt put much stress on her.
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