I am losing 17 hp when using methanol/H2O injection.
I wasnt expecting an increase I just wanted something to cool the intake when I was on track.
Shade temps will be in the mid-90s half the times Im doing HPDE.
Any suggestions?
355 hp/ 278 torque without meth
338 hp/ 283 torque with
VF350 supercharger w/ 2.62 pulley (11 psi) and intercooler
TRM software
NGK R5671A-7/4091 plugs, preset gap of .030
Snow 210 stage 2, set on 4 psi/max 10 psi
(#4) 225 ml/min nozzle
Peak 0 degree washer fluid + two bottles of Heat (30% meth)
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Bill_Yates_M3_Supercharger_and_meth.jpg
normally gap at .025, but put fresh plugs in the night before and forgot in the rush.
Any chance the .5 increase in air/fuel hurt?
The AFR will bring it down a bit to some extent, but it should be pretty much a wash as the IAT should be better with the small meth shot. I just think something looks hinky in both those curves. Its nice and smooth and linear until that point and then both of them start dancing.
Did you tune after you added meth in?
Some people run to as a safety measure only, others use it too advance timing
I use it as a safety measure
Stock fuel tune from TRM.
It's to keep me from filling up with $9/gallon 100 octane when ever I go to the track.
You can add less meth to the water if you dont want the AFR to come down as much. Fix your gaps.
Cleaned & gapped sparks down to .022.
Only 30 miles and 4 dyno pulls on these.
I assume the white frosting is from the water/meth:
SPARKS.jpg
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just for reference, here is my normally aspirated baseline:
Bill Yates M3.jpg
Water injection will clean the carbon out of your engine like you see from a slightly blown head gasket..
Super steam clean including your plugs..
From what I recall spraying water will lose you a little bit of HP on the same tune but makes the same tune very safe, and lets you make overall more power by allowing you to run higher boost or more aggressive timing where previously you would have been detonation limited.
I have been contemplating doing a pre-compressor water injection setup which also has some interesting beneficial effects on the efficiency of a compressor wheel.
E36 M3 S50 - E53 X5 M54 - 1980 Porsche 931 - 2001 Impreza RS25
Why is it so lean? You would think once it starts seeing boost the AFR would be below 13.5.
It looks like an N/A fuel curve. I'm wondering if the ECU is pulling timing for detonation. Did you datalog the runs?
The torque dip at 4200 doesn't seem like fueling. But the one at 5700 could be ignition due seeing as how it went lean for a few hundred rpm. Did you hear it hesitate?
If you're not logging Renovelo Byteshooter free can show live data, you could see if there is a drop in ignition timing at those RPMS which would indicate a learnt knock value. The paid version can datalog the MS43.
Ideally you would back to back runs and see if you see a consistent drop in torque, or its an anomaly.
I'm OBD1. How do I datalog without adding a whole system?
I just looked at video and revs were smooth.
Intercooler on this car slows boost response - boost doesn't register until 4000 rpm, 3psi at 5000 rpm. Moves quickly to 11 by 7000.
I do not like using Snow's digital pressure gauge - changes are too abrupt.
Last edited by M5Yates; 02-19-2019 at 10:17 PM.
(ignore the air/fuel gauge)
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