I want your spool data!
#302
Newb
Join Date: May 2016
Location: Massachusetts
Posts: 21
Total Cats: 0

If not the thing's going to be a slug when I bolt on a potato. Maybe 2560r. Different thread for that haha
#308
Supporting Vendor


iTrader: (31)
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 15,092
Total Cats: 1,873

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Trackspeed Engineering
High-Performance Turbo Specialists - Sunnyvale, CA - 650-701-7223 - Email us!

High-Performance Turbo Specialists - Sunnyvale, CA - 650-701-7223 - Email us!

#310

fascinating ... had not considered the oxygenation component. Would still love to see an apples to apples comparison (which may not be fair due to flame front speed) with turbine inlet pressures and EGTs recorded. May be more proper to compare MBT tuning, but that introduces a fair amount on complex interaction churn. I will actually be in a position to take this measurement at some point here this summer (hopefully ...).
#311
Junior Member
Join Date: Mar 2011
Location: Eindhoven, The netherlands
Posts: 189
Total Cats: 17

now with the 1000s at 20 psi my duty cycle is around 55%. So there is enough left for future plans
#313

fascinating ... had not considered the oxygenation component. Would still love to see an apples to apples comparison (which may not be fair due to flame front speed) with turbine inlet pressures and EGTs recorded. May be more proper to compare MBT tuning, but that introduces a fair amount on complex interaction churn. I will actually be in a position to take this measurement at some point here this summer (hopefully ...).
You get more power from E85 because it's got higher octane (so you can advance the timing/run more boost and thus turn more of the heat energy into useful work), and because it's got a higher H/C ratio than gasoline does. Combining oxygen with hydrogen releases more energy than combining it with carbon does, so for a given amount of input oxygen (which is ultimately what displacement, boost, VE, etc are all about), you want to maximize the amount of H you burn. Methanol is better than ethanol, and pure hydrogen is even better than that. High performance rocket engines burn liquid hydrogen with liquid oxygen, partly for this reason.
What that means for spool -- more timing means more energy in the piston, meaning less in the exhaust for the turbine to use. OTOH, more energy in the piston means the engine accelerates through the RPM band faster, meaning it gets to the higher-flow revs sooner, and the higher H/C ratio giving more energy overall means that even if you're getting a lower percentage of it in the turbine it's coming out of a larger total. Empirically, as Savington says, it doesn't really make a significant difference either way, so who cares.
--Ian
#315
Senior Member

iTrader: (1)
Join Date: Apr 2011
Location: Jonesboro Arkansas
Posts: 533
Total Cats: 25

Engine: 99 1.8l
Turbo: GT3076R 56 .60 A/R
Manifold: BEGi CastExt. Wastgate
Downpipe Size/Style: Single tube 2.5"
Exhaust Size: 2.5"
Exhaust Components: Resonator & Magnaflow Muffler
Intercooler Core Size: BEGI #2
Intake Manifold: Stock
Headwork: unknown
Engine Management: Hydra
Other Spoolin' Helpers/Hurters: Basically FM plumbing
Trans & Rear End Ratio: 5-speed, 4.1 LSD
Rear tire size: 225/45/15
Fith GEAR PULL:
RPM Boost(psi)
2700 0
2800 .6
2900 1.8
3000 1.8
3100 2.4
3200 3
3300 3.7
3400 4.9
3500 5.5
3600 6.1
3700 7.3
3800 8.6
3900 9.7
4000 10.4
4100 11
4200 12.9
4300 14.1
4400 15.3
4500 17.2
4600 17.3
4700 18
Long spool?
Turbo: GT3076R 56 .60 A/R
Manifold: BEGi CastExt. Wastgate
Downpipe Size/Style: Single tube 2.5"
Exhaust Size: 2.5"
Exhaust Components: Resonator & Magnaflow Muffler
Intercooler Core Size: BEGI #2
Intake Manifold: Stock
Headwork: unknown
Engine Management: Hydra
Other Spoolin' Helpers/Hurters: Basically FM plumbing
Trans & Rear End Ratio: 5-speed, 4.1 LSD
Rear tire size: 225/45/15
Fith GEAR PULL:
RPM Boost(psi)
2700 0
2800 .6
2900 1.8
3000 1.8
3100 2.4
3200 3
3300 3.7
3400 4.9
3500 5.5
3600 6.1
3700 7.3
3800 8.6
3900 9.7
4000 10.4
4100 11
4200 12.9
4300 14.1
4400 15.3
4500 17.2
4600 17.3
4700 18
Long spool?
#320

--Ian