05 colorado SBE 6.0/C480/4l80e 9.78@143 foot brake 3850lbs
#1505
Hey Denmah,
How far from the turbo do you have the WBO2? Im running the holley and my down pipe is only going to be approx 14 inches. Im seeing alot of threads saying the o2 wont read correctly if too close to the turbo, due to the pressure and to close to the outlet because of pulling in fresh air on light and part throttle driving. Recommending 18 inches from the turbo and 12 inches from the outlet. Your DP is obviously super short and its a street truck, have you ran into any issues with this? Has it had any affect on when tuning the truck?
How far from the turbo do you have the WBO2? Im running the holley and my down pipe is only going to be approx 14 inches. Im seeing alot of threads saying the o2 wont read correctly if too close to the turbo, due to the pressure and to close to the outlet because of pulling in fresh air on light and part throttle driving. Recommending 18 inches from the turbo and 12 inches from the outlet. Your DP is obviously super short and its a street truck, have you ran into any issues with this? Has it had any affect on when tuning the truck?
#1506
8 Second Club
iTrader: (4)
Crazy those pumps are drawing that many amps with almost no load on them.
Here is the amps VS pressure chart for the 450 pump below.
If you’re right around 50a now, at higher pressures the amp drow will only increase from where it is now. Also if your pumps alone are drawing 50a+ don’t you think the alternator is maxed out? If the alt can’t keep up, flow is gonna drop as the demand increases.
You could do a test and raise your base pressure with the clamp on it for us and see how much amperage is being pulled at say 65-75-85-95 psi. (with the car running so we get max voltage) Then you’d know how large of an alternator you need roughly.
Thanks for testing that! Surprising results.
Here is the amps VS pressure chart for the 450 pump below.
If you’re right around 50a now, at higher pressures the amp drow will only increase from where it is now. Also if your pumps alone are drawing 50a+ don’t you think the alternator is maxed out? If the alt can’t keep up, flow is gonna drop as the demand increases.
You could do a test and raise your base pressure with the clamp on it for us and see how much amperage is being pulled at say 65-75-85-95 psi. (with the car running so we get max voltage) Then you’d know how large of an alternator you need roughly.
Thanks for testing that! Surprising results.
#1507
TECH Apprentice
I might be off base here, but from the chart, if he is running at 50 psi, EACH pump is pulling 14.36 amps. So, 3 pumps would be a total of 43.08 amps thru the power wire at the relay...
#1510
9 Second Club
#1511
Without double checking the statement I'm about to make (I could be wrong), I think the 30% figure is based on weight and when the fuel density (weight per volume or pounds per gallon) is taken into account, it's closer to 50% more fuel, by volume, gallon for gallon.
I should double check that, just not feeling like it at the moment. Anyone else care to verify that?
I should double check that, just not feeling like it at the moment. Anyone else care to verify that?
#1513
Teching In
Join Date: Dec 2015
Location: Rochester, MN
Posts: 41
Likes: 0
Received 0 Likes
on
0 Posts
Based on what I've seen in this build and a lot of others, the actual number is higher than that by a decent margin. Its anecdotal of course, but it always seems like ethanol users are always needing more and more fuel system.
#1514
TECH Enthusiast
iTrader: (2)
Yeah probably closer to 40%. I put supposedly 41% bigger injectors in my turbo bike and went from gasoline to e85. I didn't touch the tune. It runs perfectly but it is a tenth or two points leaner on the gasoline scale. The e85 measured exactly 85% with the little Holley test tube thing.
#1515
In my req'd fuel setting on ms3 it was much closer to 50% then 30% when I made the switch from 92 to E85.
Totally worth the pump work and big injectors if its available in your area IMO. Pretty sure the large tuning window saved my first 2 motors from my sketchy at best tuning at the time. lol
Totally worth the pump work and big injectors if its available in your area IMO. Pretty sure the large tuning window saved my first 2 motors from my sketchy at best tuning at the time. lol
#1516
In my req'd fuel setting on ms3 it was much closer to 50% then 30% when I made the switch from 92 to E85.
Totally worth the pump work and big injectors if its available in your area IMO. Pretty sure the large tuning window saved my first 2 motors from my sketchy at best tuning at the time. lol
Totally worth the pump work and big injectors if its available in your area IMO. Pretty sure the large tuning window saved my first 2 motors from my sketchy at best tuning at the time. lol
#1518
TECH Resident
iTrader: (13)
The Knock resistance of E50 is equal to that of E85 and will allow you to stretch your fuel systems capabilities a bit further.
The 2 tradeoffs to running the lower ethanol % is you realize less of the benefit from the O2% increase with ethanol as well as the Lower Heating Value (LHV) of ethanol. What this translates to is a very minor "chemical supercharging" affect with the added O2% and the LHV is the energy required to phase change the fuel liquid to a fuel vapor. That energy comes from the heat in the air charge (much more apparent on a direct injection engine but still occurs in port injection although a large portion of the heat is pulled into the fuel from the head and intake valve prior to entering the chamber). More heat absorbed = higher density charge (due to lower temperature at the same pressure - ideal gas law) entering the combustion chamber, and will ultimately lower EGT's more at the higher ethanol % mixtures than lower % mixtures.
All that being said, E50 has taken many people pretty far in the racing world. And you can hit the 50% mark every time based on testing at the pumps and mixing yourself to account for changes in ethanol % throughout the year and pump locations. This is assuming you dont have ethanol feedback and on the fly adjustment for AFR at the minimum.
#1519
9 Second Club
Any nitrous line would be of a teflon nature.
That isnt to say there isnt runner based hose used in hydraulic systems that can easily cope with 1000psi....but I doubt anyone needs or wants huge diameter lines for nitrous in a car...unless it was maybe a 5000 shot lol
#1520
TECH Fanatic
iTrader: (12)
There is no rubber nitrous line.
Any nitrous line would be of a teflon nature.
That isnt to say there isnt runner based hose used in hydraulic systems that can easily cope with 1000psi....but I doubt anyone needs or wants huge diameter lines for nitrous in a car...unless it was maybe a 5000 shot lol
Any nitrous line would be of a teflon nature.
That isnt to say there isnt runner based hose used in hydraulic systems that can easily cope with 1000psi....but I doubt anyone needs or wants huge diameter lines for nitrous in a car...unless it was maybe a 5000 shot lol