3.25 pulley
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
I'm curious I have 1 7/8 headers with 3.5in pulley on my LS3 EForce and on the Dyno I got 6.99 psi at max rpm. So has anyone changed to a 3.25 without changing out the fuel pump. So I figure you pickup top in HP of maybe 50-60 hp but how much medium range torque if any. And would you need to retune the car with adding just a couple psi?
Safety Car
Joined: Sep 2007
Posts: 3,502
Likes: 82
I'm curious I have 1 7/8 headers with 3.5in pulley on my LS3 EForce and on the Dyno I got 6.99 psi at max rpm. So has anyone changed to a 3.25 without changing out the fuel pump. So I figure you pickup top in HP of maybe 50-60 hp but how much medium range torque if any. And would you need to retune the car with adding just a couple psi?
To go further you need...
#1 Either the Z06 pump or add a boost-a-pump
#2 Larger fuel injectors. The 52lb injectors are maxed at your level
#3 A full tune with the new injectors
#4 And of course you need the 3.25" pulley
#5 Same belt though...works from 3.875"-3.25" pulleys
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
I knew the alky would up the boost a little but I didn't think it would be enough to matter. I guess I was wrong.
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
RWHP. From 541, now 571
Torque. From 550 to 580
This on a safe tune with 0 knock and set to pull a ton of timing if the IAT,s get to the levels I was getting without meth, in case it fails.
now the amazing part. Directly compared to my last tuning session the IAT's, after multiple pulls were 35 degrees lower and stayed at the same level every pull. After 4 or 5 pulls I touched the top of the eforce and could rest my hand on it. It was warm but not hot. Try touching it without meth. I have and you can't for more than a second. The highest temp seen was 105. Before I was seeing 140.
I would do it again in a heartbeat and I'll take my chances on the coating issue.
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Pro
Joined: Nov 2007
Posts: 605
Likes: 15
From: Rocky Mountains Colorado
realcanuk - Congratulations! Great results. Were you running the 3.5" pulley? Were you spraying a 50/50 mix of methanol/water (mix by weight or volumn or washer fluid)? Do you know the max Manifold Absolute Pressure developed (kPa), at what RPM, AFR and Dynamic Cylinder Air(g/cyl)? Can you post a data log of your tuning session? This info will be very helpfull to me and others who are researching and looking to add methanol injection to the E-Force.
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
realcanuk - Congratulations! Great results. Were you running the 3.5" pulley? Were you spraying a 50/50 mix of methanol/water (mix by weight or volumn or washer fluid)? Do you know the max Manifold Absolute Pressure developed (kPa), at what RPM, AFR and Dynamic Cylinder Air(g/cyl)? Can you post a data log of your tuning session? This info will be very helpfull to me and others who are researching and looking to add methanol injection to the E-Force.
What I do know is the peak hp was 571 at 6000 rpm. I believe afr is 12.1 there. Peak tq was 580 at about 3600 rpm. The boost ran between 7.5 and 8 and as eforces do it ran up to 10 quickly for a second right at 6000 rpm. The increase of 30hp is actually more than it seems because although I was getting 540 hp before, that would drop off as the temps went way up. Now the temps stay down nicely.
Pro
Joined: Nov 2007
Posts: 605
Likes: 15
From: Rocky Mountains Colorado
realcanuk - Thanks for posting your data. If you can get your hands on your data log or your max MAP kPa and g/cyl, that would be great. I am running the 3.25" pulley at altitude and developing avg boost of 7.91 lbs between 4,500 RPM and 6,000 RPM with boost peaking at 10.13 lbs at 6,400 RPM. My intake air temps run from 127* - 151*. Based on your data, a methanol/water (washer fluid) injection (Alky system) will help a great deal in bringing down my IAT's.
Race Director
Joined: Mar 2007
Posts: 11,331
Likes: 18
From: Missouri City Texas
Which washer fluid were you using?
Be sure you're using the lowest temp fluid and one that doesn't contain any detergents or anything.
Unfortunately down here in Texas we can't get any washer fluid that has any acceptable amount of meth in it. I've been thinking of running denatured alcohol/water as I can get it pretty cheap instead of meth.
Be sure you're using the lowest temp fluid and one that doesn't contain any detergents or anything.
Unfortunately down here in Texas we can't get any washer fluid that has any acceptable amount of meth in it. I've been thinking of running denatured alcohol/water as I can get it pretty cheap instead of meth.
Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,685
From: Southeast TX
Nice increases
What were the OAT's during the runs? Why do you think you got a boost increase with the w/w fluid? I've never seen that and have used it on TVS blowers and also earlier Maggies.
FloydSummer....you might be able to order in some higher meth content w/w fluid. I had my local NAPA dealer order some for me that was good down to -32 degrees IIRC. Wasn't ridiculously expensive either.
What were the OAT's during the runs? Why do you think you got a boost increase with the w/w fluid? I've never seen that and have used it on TVS blowers and also earlier Maggies. FloydSummer....you might be able to order in some higher meth content w/w fluid. I had my local NAPA dealer order some for me that was good down to -32 degrees IIRC. Wasn't ridiculously expensive either.
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
I am running this fluid.
http://www.recochem.com/en/products/...ld_washer_35c/
Average 40% methand no detergents. The less the 1% other stuff is the dye. I pay around 2.50 a gallon for it and I just bought a few cases because it can be harder to find in the summer.
I dont really know why the meth increases the boost but my tuner told me we had to check before changing pulleys because it would increase it some. Possibly it seals some gap between the rotors ?
IAT's even after 5 or 6 hard dyno pulls never went over 105. Compared to before that is a miracle.
http://www.recochem.com/en/products/...ld_washer_35c/
Average 40% methand no detergents. The less the 1% other stuff is the dye. I pay around 2.50 a gallon for it and I just bought a few cases because it can be harder to find in the summer.
I dont really know why the meth increases the boost but my tuner told me we had to check before changing pulleys because it would increase it some. Possibly it seals some gap between the rotors ?
IAT's even after 5 or 6 hard dyno pulls never went over 105. Compared to before that is a miracle.
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
Oh, one more thing. My guy is a snow dealer and does tons of those kits. He was super impressed with the Alky Control. Never saw it before and says the delivery is more even and easier to tune. Thanks Julio
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
Temps were 75 degrees. That is probably similar to the temps of my last session although I am not sure that is all that relevant by the time you do a few runs. Even if it was 50, after a few pulls my iats would be very high and there was no way the eforce unit was only warm to the touch before.
I wish I would have measured the temp of the head unit before. That number would interest me.
I wish I would have measured the temp of the head unit before. That number would interest me.
Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,685
From: Southeast TX
Temps were 75 degrees. That is probably similar to the temps of my last session although I am not sure that is all that relevant by the time you do a few runs. Even if it was 50, after a few pulls my iats would be very high and there was no way the eforce unit was only warm to the touch before.
I wish I would have measured the temp of the head unit before. That number would interest me.
I wish I would have measured the temp of the head unit before. That number would interest me.
You need to invest in a handydandy infrared temp gun. You can get a pretty good one for under a hundred bucks now. Point at the object you wish to know the temp of, and the temp will show up in a matter of seconds. You'll find lots of uses for it. Aim the laser pointer at the wife's forehead to see exactly how mad at you she really is......
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
I never saw the benefits you're seeing. But, I never saw the temps over ambient you're seeing either. About 30 to 40 over is about it as long as I had air flowing over the h/e. With meth, it was only about 10 degrees cooler. I felt I could either run it stupid rich (safe) or have a meth dependent tune and hope like hell it kept working. Didn't see enough difference in IAT's to program in much safety.
You need to invest in a handydandy infrared temp gun. You can get a pretty good one for under a hundred bucks now. Point at the object you wish to know the temp of, and the temp will show up in a matter of seconds. You'll find lots of uses for it. Aim the laser pointer at the wife's forehead to see exactly how mad at you she really is......
You need to invest in a handydandy infrared temp gun. You can get a pretty good one for under a hundred bucks now. Point at the object you wish to know the temp of, and the temp will show up in a matter of seconds. You'll find lots of uses for it. Aim the laser pointer at the wife's forehead to see exactly how mad at you she really is......