was planning on adding water/meth... looks like next mods will be a different clutch and a fuel system

had a full tank of fuel w/ some cetane boost and some 2 stroke. Truck seemed to like that, I saw 1450* and climbing in 6th. Thinkin' a little extra gravity fuel feed gave me a little more juice?? truck felt good too

I generally don't rug it in 6th unless I'm showing 2,000rpm or more because it's awful smokey if I do but I was coming up on a flowersmoke and got lazy and just laid off in it at about 70mph. turbo smacked at about 1850rpm and pushed right through the clutch!

rolling into it or laying into it at higher RPM or even letting the turbo smack in lower gears = no slippage... for obvious reasons I haven't repeated the 6th gear low RPM rug! truck is still holding a hard 5-6 shift

gonna call Peter on Tues and see what he recomends... now if a fully splined/big input 5sp would fall in my lap so I can get rid of this 6sp when I do the clutch job, I'd be a happy camper!

 

I thought 1850 would be plenty of rpm to keep the clutch out of the "lugging" area. Whats numbers is that truck is putting out.

 

just a WAG, but I'm hoping for 525hp 1100tq... OFE is only rated for 450rwhp, so I'm not dissing the clutch in any way! I'm seeing about 45psi right around 1850-1900... torque numbers are probably up there!

 

My OFE has been great too, I think Gypsymans ofe is holding 640 hp. Incredible.

How come you want a built nv 4500 over the 5600?

 

oh, I think if I had a slower spooling turbo, the OFE will hold a lot more, this thing just hits so hard right there... if I nail it at 2000rpm, the needle tags 55psi and not a hint of slippage... if I wind out 5th to 3000 and bang 6th, not a hint of slippage.

as for the 5sp vs 6sp, the 6sp gear spacing is just too close and it's slow shifting... if I had like a 3.0 rear gear, it'd probably be great, but I'm shifting way too much and not really getting anywhere till 5th gear!

w/ a 4k GSK and a 5sp, I think this thing would be an absolute hoot to drive! 4k is probably going in tomorrow might be a hot minute before the 5sp happens

 

what kind of exh temps are you seeing with that sps 62. How would it compare to a set of bd twins, for spoolup, towing etc.

All this 12 valve talk makes me miss my 97 3/4 ton 5-speed. Someday I want to find one identical to yours but a long box

 

well, it's hard to say because I went from a set of Rip's twins using a PDR35-12 on top and an S400 on bottom to a RAYMAC ported head and sps62... I've been told the head work is probably dropping my egt's by a couple hundred... I'm still hotter... not by much! but definately hotter... I'd say I'm 100-150* hotter w/ my current setup than w/ the twins, but this thing hits a lot harder than the twins...

w/ the twins, I could get 40psi at about 2000, 45psi at about 2300-2400, and 50psi at about 2500.

obviously this thing comes in later at first, but I can get 45psi around 1900 55psi just over 2000 How much of that is the cylinder head? I don't know, but I don't tow anything, so the 6sp and the twins just don't really do much for me, but if there's towing involved, NOTHING compares to twins IMHO, they run so cool it's rediculous

hottest I've seen so far is 1450*, I'm sure that'll get higher as I go over 3000rpm, but my next power mod is going to be water/meth... so EGT's should be a non-issue

oh yeah, I've been considering trying/buying a silver bullet 66 and see how it does. I'd LOVE similar/slightly later initial spool and another 100*+ EGT reduction

 

Im willin to bet some money that ur higher in HP than I am

How would the SB be on spoolup tho? Im curious to see that.. Awesome Job man!

Rick

 

I don't know... I've HEARD that the SB turbine is supposed to spool similarly or better than the sps turbine... we'll see

I've got more injector than you

and we're moving similar air, so I'd hope I'd have more power!!!!! but when it comes to EGT's, twins are king hands down!!!!

but you know how it goes, 60psi from twins usually means 50-100 more hp than 60psi from a single!

 

my ofe held 505/1021 last week. and i am running 47psi, and my hairdryer hits pretty hard. did you have many miles on yours??

 

No doubt about that man

I need some DDP 4's But before that, that stupid high pitch sound is on my last nerve, gotta kill that!

Anyways correct me if im wrong here, the reason 60 lbs of twinned air are usually more power is due to the thicker cooler air being able to better burn that fuel and lower egts right? (brain on the move...)

Thanks man!

Rick

 

just a WAG as it was in the truck when I bought it, but I'm gonna say about 40-60k miles? I drive agressively, but I rarely shift agressively, I don't do stupid stuff like burnouts or try to slip the clutch to launch, etc.

and who knows, it may not slip again under those conditions, but the fact that it slipped at all means it's time for more clutch because I'm still looking for more power!


Rick, yeah, the twins at 60psi are moving a lot more OXYGEN than a single at 60psi... lower charge temps due to operating efficiency = more oxygen per mass, and more oxygen = lower EGT's