boosted Ls2's. ....lbs boost/hp?
05-11-2015, 05:18 PM
#21
Drifting
Boost is at 11 or 12 lbs., can't remember. It definitely wasn't 10. Run the 4.0 with full Meth and see what it makes. Easy to pulley down later. Don't get caught up in the numbers, T-trim is a beast on the top side for the street. Lots of guys make good peak numbers in cool weather but without the Meth they are making no where near that power in the summer, especially after a few pulls. I've seen more than a few 500 whp N/A cars whoop up on F/I guys making 150 more hp under ideal dyno conditions.
Last edited by NormWild; 05-11-2015 at 05:22 PM.
05-11-2015, 10:52 PM
#22
Le Mans Master
Thread Starter
605 was without Meth on a different dyno, current numbers are on a Mustang Dyno with Methanol.
Boost is at 11 or 12 lbs., can't remember. It definitely wasn't 10. Run the 4.0 with full Meth and see what it makes. Easy to pulley down later. Don't get caught up in the numbers, T-trim is a beast on the top side for the street. Lots of guys make good peak numbers in cool weather but without the Meth they are making no where near that power in the summer, especially after a few pulls. I've seen more than a few 500 whp N/A cars whoop up on F/I guys making 150 more hp under ideal dyno conditions.
Boost is at 11 or 12 lbs., can't remember. It definitely wasn't 10. Run the 4.0 with full Meth and see what it makes. Easy to pulley down later. Don't get caught up in the numbers, T-trim is a beast on the top side for the street. Lots of guys make good peak numbers in cool weather but without the Meth they are making no where near that power in the summer, especially after a few pulls. I've seen more than a few 500 whp N/A cars whoop up on F/I guys making 150 more hp under ideal dyno conditions.
05-12-2015, 08:15 AM
#24
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St. Jude Donor '15
05-13-2015, 11:21 AM
#25
Le Mans Master
Thread Starter
I've been running a 4.0 inch pulley since day one, car has always made good power (in my sig). Exact same set up as yours. I might be wrong but I remember for every 1 psi in boost you pick up about 10 hp. So a 3.8 won't make that much difference.
Use the Meth to make power, crank it up and spray it. The theory there is if you run your tune Meth dependent, when you don't have Meth (pump failure, run out) you want the ECU to yank all your timing and make the car fall on its face. Motors blow because of the knock you don't know you have.
Use the Meth to make power, crank it up and spray it. The theory there is if you run your tune Meth dependent, when you don't have Meth (pump failure, run out) you want the ECU to yank all your timing and make the car fall on its face. Motors blow because of the knock you don't know you have.
05-13-2015, 01:02 PM
#27
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St. Jude Donor '15
I have no idea if that's normal, but mine has always done that. I'm a fan of using a MAF sensor when it's feasible as the changes are much smaller (if any)
05-13-2015, 01:03 PM
#28
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St. Jude Donor '15
05-13-2015, 03:25 PM
#29
Drifting
I'm sure your tuner already told you but going to SD you will need a 2 Bar MAP Sensor.
05-13-2015, 03:28 PM
#30
Drifting
Primary reason I haven't gone SD. I've never heard a good explanation of how this is handled by the ECU. There really is no benefit of switching to SD, I looked to switch a bunch of times but was talked out of it.
05-13-2015, 03:34 PM
#31
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St. Jude Donor '15
The VE table has volumetric efficiency values for different RPM/manifold pressures and from there can calculate how much air goes into each cylinder on each intake stroke.
It can and does work well, and the calculations are faster than reading a MAF (especially at lower/slower airflows) but I still see fuel trims change a lot more when using it vs. the MAF.
05-13-2015, 03:47 PM
#32
Drifting
It uses volumetric efficiency to estimate airflow, not too complicated.
The VE table has volumetric efficiency values for different RPM/manifold pressures and from there can calculate how much air goes into each cylinder on each intake stroke.
It can and does work well, and the calculations are faster than reading a MAF (especially at lower/slower airflows) but I still see fuel trims change a lot more when using it vs. the MAF.
The VE table has volumetric efficiency values for different RPM/manifold pressures and from there can calculate how much air goes into each cylinder on each intake stroke.
It can and does work well, and the calculations are faster than reading a MAF (especially at lower/slower airflows) but I still see fuel trims change a lot more when using it vs. the MAF.
05-13-2015, 03:58 PM
#33
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St. Jude Donor '15
I didn't explain volumetric efficiency very well.. Basically if a cylinders volume is 1 liter, and on the intake stroke at a particular MAP/RPM it will bring in 0.75 liters of air, then you could say the VE would be 75% for that point on the table. Obviously with a supercharger you can get over 100%
05-13-2015, 09:26 PM
#34
Le Mans Master
Thread Starter
Car made 530whp on 8 lbs of boost....? Pretty disappointing. ....since also using meth (post maf for protection only).
I spoke with tuner and he said he was surprised at that number as the car felt as if it was going to come off the dyno and said he thinks it is probably closer to 600whp (after expressing my disappointment). ......? Said it was pretty humid/hot evening (south Mississippi) and it only made 8lbs but would be closer to 10lbs in a cooler environment. ....his building is really hot normally.....thoughts
I spoke with tuner and he said he was surprised at that number as the car felt as if it was going to come off the dyno and said he thinks it is probably closer to 600whp (after expressing my disappointment). ......? Said it was pretty humid/hot evening (south Mississippi) and it only made 8lbs but would be closer to 10lbs in a cooler environment. ....his building is really hot normally.....thoughts
Last edited by C U IN REARVEIW; 05-13-2015 at 09:29 PM.
05-13-2015, 09:36 PM
#35
Sorry to hear id be disappointed too..
05-13-2015, 10:20 PM
#36
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St. Jude Donor '15
Yeah I thought you'd see a little more than that too.. got a graph/afr/timing?
05-13-2015, 10:49 PM
#37
Safety Car
Seems way off. I would actually use the meth unless your tuner doesn't know how to tune it.
Last edited by Detoxx03; 05-13-2015 at 10:52 PM.
05-13-2015, 11:08 PM
#38
Le Mans Master
Thread Starter
I am picking the car up tomorrow. Not sure if he will presenthave a print out ready, but will ask for one. tuner seems to know his stuff and has produced some nice results on various build....not sure what's up. ....dyno off (dynojet)?
05-13-2015, 11:14 PM
#39
Le Mans Master
Thread Starter
Was planning to as i did an iat relocation kit w/ ls3 maf (2005 car) and he said where the meth was spraying it would corrode iat sensor. ...so we did speed density tune and sprayed meth on top for safety....? So basically the car is not recofnizing any of the benefits from the meth.....How much power would be lost in a 85* humid dyno atmosphere?