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Dynoed the 74mm Part #2 - New Best 1000AWHP/716TQ @ 48psi!

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twicks69

Supporting Vendor
4,196
1,642
Mar 12, 2004
Milwaukee, Wisconsin
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Here is the first thread made when it did 835AWHP in 2011-
http://www.dsmtuners.com/forums/dyno-talk/407235-dynoed-74mm-new-best-835awhp-46psi.html


I only did 4 pulls today to check the tune before DSM Shootout. 3 of them were 28psi wastegate spring pressure, the 4th was ~48psi boost and the numbers shown were the last 28psi pull and the only ~48psi boost pull.


Differences from last session were:
*The changeover to a BoostLab 360* bolted-down thrust bearing instead of the stock Borg Warner 270* one.

*Changed primary and secondary fuel injectors to high impedance units; 2200cc primaries, 1000cc secondaries. Same old 4 Walbro 255HP fuel pumps. Still, only had the primary rail and two pumps (1x Walbro 255HP in-tank and 1x Walbro 255HP in-line pump on -6AN feed line).

*Replaced cylinder head as I crushed it last year. I installed the same cams, same 1mm oversize valves, GSC shortie valve guides, same valve springs; similar port work with more time into the runners than before. Dale Morss Machining (BogusSVO on Tuners) did the machinework, portwork and assembly of the cylinder head.

*Machined and installed my new design shouldered dowels to fit into the cylinder head to prevent the head stud washer from crushing the cylinder head under my kind of boost levels.


So, in all, not much changes; a port work change on the fresh head, and mainly a fuel injector change to high impedance.


Here's the graph!!
 
Last edited:
The transmission was from 2011 after I vaporized my previous transmission on the 1st pass at 2011 DSM Shootout. I maybe only have 20 or 30 passes on it currently; holding up ok so far.

There was no video of the dyno stuff because it was really an impromptu thing to check my tune. I did 3 pulls at wastegate pressure of 29psi, then turned it up to a guesstimate area around 50psi (manual boost controller), and let it eat on the dyno for 1 pull. It hit around 48-49psi and that was good enough for me for 1 pull. Tune looks great!
 
Very Nice work!!! That is one fat power curve and enough torque to hurt things. It will be one heck of a ride if you can put the power down, Tim.
 
It will likely put a hurtin on transmissions; I am hoping my bigger transfer case, driveshaft, tcase brace, rear diff brace, Evo rear diff, and DSS stage 5 axles are enough. Likely I will find a fail point; I am expecting shredded gearsets again if I try to regularly do 1/4 mile passes on kill mode.

Considering I was running 9.4's on the old head with 35psi and 153mph traps. Before my old head died, I had the boost at this range and was doing 132mph 1/8mi traps.

The goal is upper 8's and 162-165mph traps. I will take my time getting there; nothing happens overnight as I have been in the 9's since 2007! A lot has to do with my 3300# vehicle weight.
 
Scary amount of power, hopefully you put it down a few times before the carnage begins.
 
Congrats on the 4 digits Tim. Can't wait to see this thing make a clean pass. Hopefully everything holds up long enough :hellyeah:
 
twicks, can you explain this ?

*Machined and installed my new design shouldered dowels to fit into the cylinder head to prevent the head stud washer from crushing the cylinder head under my kind of boost levels.
 
Holy Crap man! Congrats! What tranny are you running? Ridiculous custom dogbox?
 
It should be bronze material for the thrust bearing.

The dowels are custom units I had machined to press-fit into the cylinder head to prevent crushing of the aluminum cylinder head by the head stud washers and prevent elongation of the bore by better seating the stud washers against a material that doesn't deflect.


The transmission is essentially a custom Stage #3/4 with mods; I have an Evo 1 1st, 2nd; 91-92 HD DSM 3rd, 4th; an Evo 3 5th; then a spooled center diff and a Ralliart clutch-type front differential. Steel shift forks, HD forged Evo 1 shift rails. The entire gearset started all brand new, then deburred, detailed, shotpeened, cryo-treated with post-oil quenched heat-treatment. It is a full helical and synchronized transmission. I have single 1/3/4/5/R with double 2nd only.
 
Damn good numbers, that thing must be a torque monster at 716ft lbs, pretty sure you'll be in the 8s, I like how its full weight to. Hope I get to se some vids sometime.
 
It should be bronze material for the thrust bearing.

The dowels are custom units I had machined to press-fit into the cylinder head to prevent crushing of the aluminum cylinder head by the head stud washers and prevent elongation of the bore by better seating the stud washers against a material that doesn't deflect.

Thats a great idea. At what power lever did you find yourself having issues with the head before? What did you machine the dowels out of?
 
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