Why you would NOT upgrade your turbo
- Thread starter Killerbee
- Start date
Don't forget you can't introduce N20 as smoothly as boost. Even with progressive controllers it is big shots of N20 just not all at once. Solenoids are open or closed and are pulsed for the ramp rate. So while it helps to smooth the introduction it's not totally smooth. I personally think the spikes in power caused by the introduction of N20 causes huge spikes in CP and damage to hard parts. It seems like progressive controllers have really helped with motor life though.
There are a couple factors in CP that must be taken into consideration. This from my measurements. Going from 20-40 PSI boost does not increase CP 1000 PSI. Mainly because the compression in not Adiabatic. It does increase though, the total amount is a function of how hot the chamber walls, piston and head have gotten. The cooler the chamber, the closer to isothemal compression.
The other is the "kick" from a given amount of fuel as boost comes up. The kick looks to be related to the pre-burn pressure and not the boost itself. And that is the interesting part. More boost keeps the chamber cooler and thus the peak pressures. Al that with the same fuel loading.
I will have to look at a lot more data to weed out all the factors, but that is my gross assessment.
The other is the "kick" from a given amount of fuel as boost comes up. The kick looks to be related to the pre-burn pressure and not the boost itself. And that is the interesting part. More boost keeps the chamber cooler and thus the peak pressures. Al that with the same fuel loading.
I will have to look at a lot more data to weed out all the factors, but that is my gross assessment.
Nos
NOS if done correct, with the right parts is no harder on parts than a big turbo making the same power. FACT! I just got back from dynoing my truck(over 500 miles) and made 890hp. Yes with nos but made 750 without. That to me is big power with being able to drive it that far. That was a single stage smallish jet. I will make over 1000 next time! God I love diesel trucks that you can actually drive. Jeff
NOS if done correct, with the right parts is no harder on parts than a big turbo making the same power. FACT! I just got back from dynoing my truck(over 500 miles) and made 890hp. Yes with nos but made 750 without. That to me is big power with being able to drive it that far. That was a single stage smallish jet. I will make over 1000 next time! God I love diesel trucks that you can actually drive. Jeff
High CP before TDC brakes parts...
High CP after TDC makes power...
Nitrous does not increase compression(CP) before TDC(at least it shouldent if done correctly)unless the fuel is igniting too soon( too much timming......which is recipie for big problems..
But it should increase after/around TDC( if done correctly)because the extra oxygen from the nitrous capitalizes on the unburnt fuel and completes the combustion resulting in more power on the power stroke!
High CP after TDC makes power...
Nitrous does not increase compression(CP) before TDC(at least it shouldent if done correctly)unless the fuel is igniting too soon( too much timming......which is recipie for big problems..
But it should increase after/around TDC( if done correctly)because the extra oxygen from the nitrous capitalizes on the unburnt fuel and completes the combustion resulting in more power on the power stroke!
Also , yea boost is important, but drive pressure is a often over looked demon that will ruin a engine in the blink of an eye.
too much BP and the resulting lack of exhaust will stack on the intake and compression side of the stroke REALLY causeing high CP before TDC and yet again braking parts.
this is why i allways increase the AR or size of the exhaust housing a bit to compensate for higher BP with the use of nitrous, and yes i have seen big Gains in BP with just a 50-75HP shot of the white stuff.....let alone more!!!
But what do i know......im just a guy thats builds golf cart engines......:rofl:
too much BP and the resulting lack of exhaust will stack on the intake and compression side of the stroke REALLY causeing high CP before TDC and yet again braking parts.
this is why i allways increase the AR or size of the exhaust housing a bit to compensate for higher BP with the use of nitrous, and yes i have seen big Gains in BP with just a 50-75HP shot of the white stuff.....let alone more!!!
But what do i know......im just a guy thats builds golf cart engines......:rofl:
this is you right??
1151 hp & 2000+ ft lbs w/N2O
11.255 @ 124.77 mph 2008 #2 & N20
11.67 @ 118.65 mph 2008 #2 Only
9.46 @ 149.90 mph 2007 #2 Only in Dirtymax
2005 Ultimate Dmaxvideo
http://video.dieselplace.com/hottest...BECDE44B8F.htm
2007 Dirtymax run
http://www.youtube.com/watch?v=nsiRaMQt0vc
Member #2 1000hp club w/N2O
1151 hp & 2000+ ft lbs w/N2O
11.255 @ 124.77 mph 2008 #2 & N20
11.67 @ 118.65 mph 2008 #2 Only
9.46 @ 149.90 mph 2007 #2 Only in Dirtymax
2005 Ultimate Dmaxvideo
http://video.dieselplace.com/hottest...BECDE44B8F.htm
2007 Dirtymax run
http://www.youtube.com/watch?v=nsiRaMQt0vc
Member #2 1000hp club w/N2O
did you stop and think that at 30psi the stock turbo and GT42 turbo do not move the same amount of air?
BAck in the day the same stuff happened to gasser nitrous cars... kept breaking stuff melting stuff. If we take baby steps we'll figure it out.
Diesel Power appears to have Won several coveted trophies using nitrous.
Nitrous is cold, can do low timing and burns fuel fast and late. Sounds like a winner to me on the premature CP front. Smooth nitrous delivery isn't an issue anymore, we can do 3-5 stages purdy easy and trigger it with ALL kinds of things.
Big boost, big nitrous, big chargers whatever sooner or later its gonna break stuff.
I vote nitrous as my method of adding air, after all thats all it is... COLD air in a bottle. Versus hot air from a charger/chargers.
Diesel Power appears to have Won several coveted trophies using nitrous.
Nitrous is cold, can do low timing and burns fuel fast and late. Sounds like a winner to me on the premature CP front. Smooth nitrous delivery isn't an issue anymore, we can do 3-5 stages purdy easy and trigger it with ALL kinds of things.
Big boost, big nitrous, big chargers whatever sooner or later its gonna break stuff.
I vote nitrous as my method of adding air, after all thats all it is... COLD air in a bottle. Versus hot air from a charger/chargers.
wonder what would happen to a modded vvt turbo if we kept our modfied desired boost and vane tables; and also used the boost sensor scaling table from the mcrat 20/20 tow tune 
This is assuming that we are aquiring decent drive pressure readings prior to using this boost sensor scaling table
This is assuming that we are aquiring decent drive pressure readings prior to using this boost sensor scaling table
+/- the efficiency, yes they do flow the same lb/min at the same RPM. Even with a significant difference in efficiency, the CAC would bring them within points of each other.
All i can say is that your truck is gonna turn some heads with a little nitrous tuning.......