6.2 Performance - Diesel Bombers



6.2L & 6.5L Performance Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines Related to Performance and Longevity

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Old 01-22-2011, 01:26 PM
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Default 6.2 Performance

I know these threads are mostly dominated by the 6.5's but I was wondering what people have done to increase performance of their 6.2's. Whether it be horse power gains or better fuel economy.
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Old 01-23-2011, 01:58 AM
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exhaust, turning up the pump for more fuel, and more boost. 6.2 and 6.5 are the same basically except 6.5s came with efi and 6.2s didnt. whats nice with the 6.2 is you can unlock free power just with turning the fuel screw compared to efi 6.5s that need a computer reflash. you need gauges though so u dont blow up your engine
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Old 01-23-2011, 06:26 PM
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0k, so about the exhaust. Stock I have dual exhaust. Aside from removing the muffler to run straight pipes what would you do? 3 or 4 inch? X pipe? Go to single?
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Old 01-23-2011, 09:01 PM
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do you have a turbo?
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Old 01-23-2011, 09:48 PM
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No turbo, so far as I can tell its a bone stock 6.2
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Old 01-23-2011, 11:58 PM
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I'm intersted in what this thread comes up with. I just bought an 86 Suburban with a 6.2 that I would like to step up in performance this next summer.

Chev6.2 where in Washington you located at? I'm over in the Tri-Cities
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Old 01-24-2011, 12:43 AM
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There's not alot you can do with a 6.2. The biggest improvement would be to add a turbo and turn up the injection pump.
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Old 01-24-2011, 01:11 PM
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So what's involved with tuning the injection pump? What results are you looking for?
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Old 01-24-2011, 07:59 PM
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without a turbo you cant really make a whole lot of power. they make headers but thats about it. turning up the pump wouldnt due much because you dont have any air to really burn it. it would just make black smoke.

---AutoMerged DoublePost---

but if you really want to make more power putting on a turbo is really easy. all the manifolds and intake swap directly into the 6.2 so all i would do is a go to a junkyard and look for a turbo'd 6.5. you will need gauges and a turbo master but if you keep it under 10 psi till you get new gaskets and turn the pump up a bit you will have a lot powerful truck

Last edited by Woody35; 01-24-2011 at 07:59 PM. Reason: Automerged Doublepost
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Old 05-25-2011, 06:57 PM
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The only way to safely boost the 6.2 or 6.5 is with the EFI since it takes into account the boost pressure to increase the fuel supply. The bad part is that i have been told that the 6.2 or 6.5 are not really a good candidate for really turning up the boost because the bearings are not quite as robust as some other diesels. I think years ago Banks had a turbo system for the 6.2 but it was limited ti about 2-3 pounds because Banks found out that any more and bad things started to happen the engine. I haven't kept up with all that so I don't really know where the whole story ended. The 6.5 gets away with a bit more boost because I believe they lowered the compression on the engine and probably some other things as well.

You can turn up the fuel on the 6.2 or even the 6.5 engines that came with the mechanical injection pump. I have one on my 6.5 and did turn up the fuel about 1/6 turn. The process is rather involved, try googleing for 6.2 diesel fuel injection increase. There are a couple of good writeups on the process. Not for the beginner mechanic or too faint of heart. Great fun doing it in a van. I don't think the results were worth the work, yeah it did do a bit better but not that much. Then again I kept it to the slightly gray smoke, not full black and wasting fuel.

Here you go this is one of the better set of instructions
Turn Up the Fuel on a 6.2 - 6.5 GM Diesel Mechanical Injection Pump
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