2005 LS2 to LS3 dry sump DIY
05-20-2012, 07:23 PM
#22
Track Junky
Thread Starter
Me too. I'm just pulling in the driveway now with Joe G's MAF d a buddy left his car at my house so I can snag his TB for a sec. I will know in the next 30-45 min
05-20-2012, 07:35 PM
#23
Le Mans Master
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St. Jude Donor '11-'12-'13-'14
I'd leave the MAF alone for now. Start with the different TB and see how it does. I'm excited and hopeful for you. 
05-20-2012, 08:54 PM
#25
Track Junky
Thread Starter
UPDATE!!!
She is alive! Swapped to LS2 throttle body and LS2 MAF and she purrs like a kitten. Drove around the block sans air filter with ZERO issues. Idles at 900 and fluctuated just a hair, but that was built in to the previous tune. Revved bit and no lag, hangs up very slightly on the way down but my tuner says that's to be expected with the existing tune.
Out of curiosity, I put the Halltech and LS3 MAF back in to see what would happen. She started up and idled really rough for 15-20 seconds and finally died when I applied throttle. So now I come to 2 conclusions...
1) LS2 throttle body is a must in an LS2 equipped car (well, at least my 2005). The LS3 throttle body simply won't work. Chuck, Ed, Dave, Joe - you guys were right.
2) The LS3 MAF definitely needs tuning to work with an LS2 car. Mine idled for 15-20 seconds but just couldn't hang on with the blade style MAF.
Dyno, here I come!!! Any guess with Hp/tq numbers? Mods are as follows:
Stock LS3 dry sump motor
LG street series headers, no cats
Halltech killer bee intake
Hand ported stock intake manifold
LS2 hand ported LS2 TB (as soon as I get one in hand)
Lunatti dual springs
Hardened chrome moly pushrods
Rocker arm trunion upgrade
Should have Dyno numbers in the next week or two.
Thanks to all who have helped me to this point!
She is alive! Swapped to LS2 throttle body and LS2 MAF and she purrs like a kitten. Drove around the block sans air filter with ZERO issues. Idles at 900 and fluctuated just a hair, but that was built in to the previous tune. Revved bit and no lag, hangs up very slightly on the way down but my tuner says that's to be expected with the existing tune.
Out of curiosity, I put the Halltech and LS3 MAF back in to see what would happen. She started up and idled really rough for 15-20 seconds and finally died when I applied throttle. So now I come to 2 conclusions...
1) LS2 throttle body is a must in an LS2 equipped car (well, at least my 2005). The LS3 throttle body simply won't work. Chuck, Ed, Dave, Joe - you guys were right.
2) The LS3 MAF definitely needs tuning to work with an LS2 car. Mine idled for 15-20 seconds but just couldn't hang on with the blade style MAF.
Dyno, here I come!!! Any guess with Hp/tq numbers? Mods are as follows:
Stock LS3 dry sump motor
LG street series headers, no cats
Halltech killer bee intake
Hand ported stock intake manifold
LS2 hand ported LS2 TB (as soon as I get one in hand)
Lunatti dual springs
Hardened chrome moly pushrods
Rocker arm trunion upgrade
Should have Dyno numbers in the next week or two.
Thanks to all who have helped me to this point!
05-20-2012, 08:55 PM
#26
Track Junky
Thread Starter
05-20-2012, 09:25 PM
#27
Le Mans Master
Member Since: May 2011
Location: Tampa FL (formerly Justinjor)
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St. Jude Donor '11-'12-'13-'14
I made 421/398 with intake and long tubes with NO tune.
With a tune, I'd guess you'd make closer to 430 or maybe even 440(dry sumps supposedly make more power)on a dynojet. I know they have a mustang at HPS so I'm not sure what the conversion is for that. You will be able to use the LS3 maf, Jeremy will just need to redo the maf curve.
With a tune, I'd guess you'd make closer to 430 or maybe even 440(dry sumps supposedly make more power)on a dynojet. I know they have a mustang at HPS so I'm not sure what the conversion is for that. You will be able to use the LS3 maf, Jeremy will just need to redo the maf curve.
05-20-2012, 09:39 PM
#28
Track Junky
Thread Starter
I made 421/398 with intake and long tubes with NO tune.
With a tune, I'd guess you'd make closer to 430 or maybe even 440(dry sumps supposedly make more power)on a dynojet. I know they have a mustang at HPS so I'm not sure what the conversion is for that. You will be able to use the LS3 maf, Jeremy will just need to redo the maf curve.
With a tune, I'd guess you'd make closer to 430 or maybe even 440(dry sumps supposedly make more power)on a dynojet. I know they have a mustang at HPS so I'm not sure what the conversion is for that. You will be able to use the LS3 maf, Jeremy will just need to redo the maf curve.
05-21-2012, 07:28 AM
#29
Track Junky
Thread Starter
I found an E85 station yesterday near my house. Thinking about going in the corn now. Think my stock injectors are up to the task?
05-21-2012, 08:21 AM
#30
Tech Contributor
Preston did an e85 tune in his z06 and makes big power...ask him about it.
Personally I wouldn't want to be beholden to fuel scarcity, particularly at track days, I always ran my tanks dry at track days and needed to get fuel at the closest station mid day.
If you do that you'll certainly want to get HP Tuners and have two tunes, an E85 tune and a regular tune so you can turn off the e85 for road trips. Unfortunately our cars don't have a sensor and aren't equipped to automatically adjust.
05-21-2012, 08:29 AM
#31
Track Junky
Thread Starter
Good point Joe about running two different tunes. Maybe I put that on the back burner for a while.
As a point of reference, I burn over 1/4 tank of gas for every 25 min track session. With the aftermarket Walbro fuel pump I have and modified fuel can (had to drill holes around the bottom 3" since no means to fill can from the fuel pump), I'm not comfortable running below 3/8-1/4 tank, especially on the track. This forces me to fill up after 2 sessions... E85 would only exaggerate this. I would definitely need a few 5 gallon jugs to bring with me.
As a point of reference, I burn over 1/4 tank of gas for every 25 min track session. With the aftermarket Walbro fuel pump I have and modified fuel can (had to drill holes around the bottom 3" since no means to fill can from the fuel pump), I'm not comfortable running below 3/8-1/4 tank, especially on the track. This forces me to fill up after 2 sessions... E85 would only exaggerate this. I would definitely need a few 5 gallon jugs to bring with me.
05-24-2012, 06:28 AM
#33
Track Junky
Thread Starter
Thanks Manny. My LS2 throttle body will be here Friday and I'm borrowing a stock air box from Joe G. To drive to the Dyno tune on 6/1. If all goes well, I will be on the track for some break in sessions 6/2 with ERME. Any chance you will be there?
05-24-2012, 08:12 AM
#34
Sean that sound great... As for me i have the car all apart,, putting in a new light weight clutch, new z06 trans and rear end, new big brembo, new bearing hubs, Motom coil overs and so on.. its up on jacks ..i am waiting on a parts to come and should be working finishing it up in the next week or so.. let see if i will have it ready for Erme...
regards..Manny
regards..Manny
11-16-2012, 04:13 AM
#37
Track Junky
Thread Starter
Holding up very well actually. The motor is about the only thing I DON'T worry about on the track now, even with Hoosiers. Now I'm dealing with wheel bearing, brake and steering pump problems. These Hoosiers really beat the car up!
I actually picked up about 4.5 sec per lap with 70-80 rwhp less and better sue soon and tires. Makes the car much easier to drive now.
I actually picked up about 4.5 sec per lap with 70-80 rwhp less and better sue soon and tires. Makes the car much easier to drive now.
11-16-2012, 01:43 PM
#39
Track Junky
Thread Starter
If converting wet sump to dry sump, the only differences would be no Lingenfelter conversion box, MAP and MAF sensor harnesses. All the dry sump tank and battery relocation would still need to be done.
