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I just changed my injectors from ddp 90hp to II dragon fly r3s today which are 150hp and i was thinking my boost would go up when i blocked the waste gate off. It didnt go up any. When noticed something and i was wondering if to those of you with more experience if im on the right track.
Okay, i got a little to much pre-boost fuel but i can light my turbo at roughly 1750-1800 and by time it gets to 39 psi im at 2200rpm and its starting to de-fuel.
In my mind im thinking since it clears up i got more fuel to use but when im getting to 39 psi its starting to de-fuel so i cant make more boost. W/ gsks installed im thinking ill be able to use full fuel past that point thus making more power.
When I installed my gsk my boost didn't go up. Tuning it will change things I know that. Mine used to be at 43 psi on the little hx35 now its tuned back to 34 psi. Idk that's my thought. Gsk is a heck of a mod but i don't think it will increase boost.
On Cummins forum instead of working or doing homework.
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97,2wd,5 spd, 150k,4510 nano,5in to 6in miter,100 plate,afc mods,egt boost fp,valair single,16*,4k gsk-60pounders,traction bars,.10 over gasket, tork tek ofv,.025 dvs, he351vgt 406hp 9-29-12
The GSK will increase usable rpms, but not necessarily boost.
More fuel will cause boost to build even at lower rpms.
For the week before my new turbo showed up I ran 5x12's with the stock turbo, already had a 4gsk in. I could hit 40+ before 2200rpms with the waste gate set to 32psi.
Alot of fuel pushed through a small turbo will build boost even after the gate opens!
With stock injectors even the 4gsk had little effect on boost numbers.
If you have not yet added a GSK go with a 4K. With your fueling and turbo combo, you are missing out on nearly half of the power you will have after adding a 4 GSK.
For a manual truck with plenty of fuel you will want to add the 60+ valve springs to keep things safe.
Remember higher boost psi does not translate in to higher power. You want your turbo to gate at a psi that keeps the turbo in its map. For your turbo some where near 40-45 is going to be about the top of where more boost hurts instead of helps.
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98 12 valve quad cab, MBRP 4 inch exhaust, triple pillar gauges, fuel plate removed, DDP's 042's, 5x12s, 4x4, 3.55 gears, 285/75/16s, KDP tabbed, AFC modded and tuned, 4GSK, + 60 vs, pusher intake, Carli 2.0 suspension kit, rebuilt trans by L.C.D. With Goerend valve body, billet input and triple disk converter. HX35/14cm over 472/1.10 .
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