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SVTPerformance's Chain of Restaurants
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Lets see those trucks!
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<blockquote data-quote="andymarkv" data-source="post: 16607472" data-attributes="member: 102900"><p>I agree TBI is lame....sort of...? I'm now learning that the achilles heel of these TBI trucks is the stock fuel pump.</p><p>They just don't flow enough to support much power/rpm.</p><p>Although the stock swirl port heads are junk...I swapped to crate Vortec and it <em>still</em> lays over at 4000 rpm...sometimes?</p><p>I now understand that the stock fuel pump in these trucks is just borderline of what I need. If I do a WOT pull through 2nd into 3rd, it lays over at 3500-4000. Go WOT in 3rd starting at 3500, it pulls hard to 5000! I need to diagnose with a gauge and wideband, but hopefully a new pump for a TPI f-body will be the solution!</p><p></p><p>I messed a round for YEARS in the early 2000's with this '95 350 TBI NV3500 truck before anybody really knew anything. I stuck a small Comp Cam in it, cause that's what you do with a SBC and man what a mess!! Speed density does NOT like the vacuum signal altered!!</p><p>I crutched it with a vacuum referenced fuel pressure regulator and it ran ok....but always laid over at 4000rpm! I wonder now, if I knew about the fuel pump problems...it might have been a lot more fun.</p><p>[ATTACH=full]1699089[/ATTACH] [ATTACH=full]1699090[/ATTACH]</p></blockquote><p></p>
[QUOTE="andymarkv, post: 16607472, member: 102900"] I agree TBI is lame....sort of...? I'm now learning that the achilles heel of these TBI trucks is the stock fuel pump. They just don't flow enough to support much power/rpm. Although the stock swirl port heads are junk...I swapped to crate Vortec and it [i]still[/i] lays over at 4000 rpm...sometimes? I now understand that the stock fuel pump in these trucks is just borderline of what I need. If I do a WOT pull through 2nd into 3rd, it lays over at 3500-4000. Go WOT in 3rd starting at 3500, it pulls hard to 5000! I need to diagnose with a gauge and wideband, but hopefully a new pump for a TPI f-body will be the solution! I messed a round for YEARS in the early 2000's with this '95 350 TBI NV3500 truck before anybody really knew anything. I stuck a small Comp Cam in it, cause that's what you do with a SBC and man what a mess!! Speed density does NOT like the vacuum signal altered!! I crutched it with a vacuum referenced fuel pressure regulator and it ran ok....but always laid over at 4000rpm! I wonder now, if I knew about the fuel pump problems...it might have been a lot more fun. [ATTACH=full]1699089[/ATTACH] [ATTACH=full]1699090[/ATTACH] [/QUOTE]
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