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Dynoed my 01 ho with mach 4s htt 62/12 Drag comp and only came up with 455 and 992 it did 383 and 790 on injectors only. Had a similar problem with earlier mach 3s and tst comp3 and b1-2 at 399 and 891 and on 3s only 352 and 729. It just seems low any ideas i had hoped i would hit 500hp. Truck only has 68,000 and seem to dyno well on injectors it just doesen't respond to fueling boxes.

HOHN

Maybe the pump is tired. It's not unheard of for an HO to only get 60 from a fueling box, but you should have more like 90hp over the injectors only.

You have good FP?

More Power

Fuel pressure never drops below 12psi .

paulb

It does seem low. I made 510hp with a single turbo about the same size as yours with Mach 4's. I made 455hp with the Comp on 3x5 with that setup. I really don't have much for suggestions... Check connections, i.e. ground to the battery, soldered pump wire tap. Does it ever set any codes? Do you dyno in 6th? On the street what is the max boost and max EGT's you hit?

Paul

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Truck has never set any codes boost is wastegated at 45 psi i do dyno 6th gear and i can hit 1500 deg pretty easy at 5x5 with wot.

Ph4tty

Anybody think the 62/12 is choking this man's top end? Maybe it is the pump.
Tiger Rag dyno'd just over 450 on his HO and had enough fuel and definately enough air for more.

Mountaineer

I think that she wants more air. Should your truck dyno more than what it is now with the 62/12, I dunno, but I do think it would benefit from a little more air also.

Jetpilot

That turbo is capable of 525-550 HP.... I would be suspect of the VP, as they age their performance diminishes without any signs. Another question I have is what brand and model dyno was used, were they corrected #'s if so what was the uncorrected #? There is a lot to getting good accurate results so using the same brand dyno is important, also some dynos are just too small a unit for our trucks so an appropriate size plays in as well.

Doug Smith

Tiger Rag

I'm going to dyno Friday on the way to Tim's. I think I was limited by my VP, but maybe not. I'll get a good reading with my Mach 6's and my stock HO VP on the way, then hopefully not too much longer down the road, I'll redo a dyno with the HRVP for comparison.

one54ton

Im sure it is slowing you down. Once mine started to go, it was much harder to start and the truck seemed waaaaaaaaay slower.