I got me an Aussie SD tune... mafless!
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Joined: Apr 2003
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From: dallas texas
I got me an Aussie SD tune... mafless!
Hey guys….. As some of you may know, Pete from Textralia (AKA Plan B) is currently in town. While he was here went over to Fast Tech and Pete gave Sean some lessons on speed density tuning using my car and another turbo car with 2 bar mapping as an example. 
I thought my car was as good as it gets but now with SD tuning…..WOW!!!! What a difference!!!.... My 402ci runs better than standard. My camshaft is a 244/250 @.050” on a 112LSA. The hot/cold starts, air on/off throttle response and direct drivability is 1000% better than I would have ever imagined. The idle is so nice now, I think I need a bigger camshaft…. lol….
Pete says in Australia, most of the good tuners only tune in Speed Density….Now I know why!!! I love my car all over again…. Thanks Pete & Sean… You guys ROCK!!!
BTW I’ve got a cheap MAF for sale!!! lol
Wash
I thought my car was as good as it gets but now with SD tuning…..WOW!!!! What a difference!!!.... My 402ci runs better than standard. My camshaft is a 244/250 @.050” on a 112LSA. The hot/cold starts, air on/off throttle response and direct drivability is 1000% better than I would have ever imagined. The idle is so nice now, I think I need a bigger camshaft…. lol….
Pete says in Australia, most of the good tuners only tune in Speed Density….Now I know why!!! I love my car all over again…. Thanks Pete & Sean… You guys ROCK!!!
BTW I’ve got a cheap MAF for sale!!! lol
Wash
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From: dallas texas
Originally Posted by TT_Vert
now when the weather changes you need to retune..
Wash
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From: dallas texas
Originally Posted by flynbludream
Any difference in power using the SD?
Wash
Le Mans Master
Joined: Oct 2003
Posts: 6,126
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From: Streamwood illinois
w/o a maf how can it really know how much air is entering on very hot/humid days vs. very cold days? it cant really tell the mass of air coming in, which is why SD is great at the time its tuned, but in my experiences a SD tune will not be "Ideal" when the weather changes. Try it for a while and let me know how she goes in different weather..
Dave
Dave
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Joined: May 2005
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From: Valencia Ca
Originally Posted by washguy
Hey guys….. As some of you may know, Pete from Textralia (AKA Plan B) is currently in town. While he was here went over to Fast Tech and Pete gave Sean some lessons on speed density tuning using my car and another turbo car with 2 bar mapping as an example.
I thought my car was as good as it gets but now with SD tuning…..WOW!!!! What a difference!!!.... My 402ci runs better than standard. My camshaft is a 244/250 @.050” on a 112LSA. The hot/cold starts, air on/off throttle response and direct drivability is 1000% better than I would have ever imagined. The idle is so nice now, I think I need a bigger camshaft…. lol….
Pete says in Australia, most of the good tuners only tune in Speed Density….Now I know why!!! I love my car all over again…. Thanks Pete & Sean… You guys ROCK!!!
BTW I’ve got a cheap MAF for sale!!! lol
Wash
I thought my car was as good as it gets but now with SD tuning…..WOW!!!! What a difference!!!.... My 402ci runs better than standard. My camshaft is a 244/250 @.050” on a 112LSA. The hot/cold starts, air on/off throttle response and direct drivability is 1000% better than I would have ever imagined. The idle is so nice now, I think I need a bigger camshaft…. lol….
Pete says in Australia, most of the good tuners only tune in Speed Density….Now I know why!!! I love my car all over again…. Thanks Pete & Sean… You guys ROCK!!!
BTW I’ve got a cheap MAF for sale!!! lol
Wash
Can't say enough about how much knowledge, expertise, and helpfulness that Pete shared.
Kudo's to Pete and Sean
Charlie
Former Vendor
Joined: Nov 2004
Posts: 103
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Originally Posted by CharlieTuner@AandACorvette
Pete and Sean are great guys and they helped us also.
Can't say enough about how much knowledge, expertise, and helpfulness that Pete shared.
Kudo's to Pete and Sean
Charlie
Can't say enough about how much knowledge, expertise, and helpfulness that Pete shared.
Kudo's to Pete and Sean
Charlie
Pete.
Originally Posted by TT_Vert
w/o a maf how can it really know how much air is entering on very hot/humid days vs. very cold days? it cant really tell the mass of air coming in, which is why SD is great at the time its tuned, but in my experiences a SD tune will not be "Ideal" when the weather changes. Try it for a while and let me know how she goes in different weather..
Dave
Dave
A speed density tune set-up correctly measures and compensates for both intake air density and intake air temperature with absolute accuracy.
GM have been using this method with $100,000+ Callaway built LS1 GTS vehicles in Australia for over 7 years now. It’s a method of thinking from the tuners when using larger camshafts and maintaining exceptional drivability.
Put simply, SD tuning isn’t about total HP at WOT unless the MAF is a restriction. Once tuned correctly, it’s more about accuracy and throttle feel, likened more towards removing the sponge out of the go pedal coupled with ability to smooth camshaft reverberations at idle and tip in response regardless of the barometer reading.
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Melting Slicks
Joined: Oct 2003
Posts: 2,077
Likes: 334
From: Dallas TX
St. Jude Donor '06-'09,'22,'25
Times sure have changed over there since I had my 75 HJ 253
And now I hear GM is stopping production on the Monaro for the Australian market, after the CV8-Z.
And now I hear GM is stopping production on the Monaro for the Australian market, after the CV8-Z.
Safety Car
Joined: Mar 2002
Posts: 4,928
Likes: 1
Cruise-In V Veteran
St. Jude Donor '09
Originally Posted by Rob'sC5
I'd be interested in learning this technique
Speed Density tuning is pretty easy using EFILives FlashScan and BEN Factor.
There is a lot of good info on their site.
Good Luck.
Melting Slicks
Joined: May 2003
Posts: 2,851
Likes: 1
From: San Bruno Ca
Originally Posted by Textralia
Thanks for the kind words Charlie, it was great catching up with you guys and placing faces to names. You guys have certainly got some great things coming out of your shop. Your new DynoJet eddy current chassis dyno is the best tool any tuner could ask for!
Pete.
TT Vert,
A speed density tune set-up correctly measures and compensates for both intake air density and intake air temperature with absolute accuracy.
GM have been using this method with $100,000+ Callaway built LS1 GTS vehicles in Australia for over 7 years now. It’s a method of thinking from the tuners when using larger camshafts and maintaining exceptional drivability.
Put simply, SD tuning isn’t about total HP at WOT unless the MAF is a restriction. Once tuned correctly, it’s more about accuracy and throttle feel, likened more towards removing the sponge out of the go pedal coupled with ability to smooth camshaft reverberations at idle and tip in response regardless of the barometer reading.
Pete.
TT Vert,
A speed density tune set-up correctly measures and compensates for both intake air density and intake air temperature with absolute accuracy.
GM have been using this method with $100,000+ Callaway built LS1 GTS vehicles in Australia for over 7 years now. It’s a method of thinking from the tuners when using larger camshafts and maintaining exceptional drivability.
Put simply, SD tuning isn’t about total HP at WOT unless the MAF is a restriction. Once tuned correctly, it’s more about accuracy and throttle feel, likened more towards removing the sponge out of the go pedal coupled with ability to smooth camshaft reverberations at idle and tip in response regardless of the barometer reading.
Thanks
Melting Slicks
Joined: Oct 2002
Posts: 2,855
Likes: 0
Originally Posted by washguy
Hey guys….. As some of you may know, Pete from Textralia (AKA Plan B) is currently in town. While he was here went over to Fast Tech and Pete gave Sean some lessons on speed density tuning using my car and another turbo car with 2 bar mapping as an example.
I thought my car was as good as it gets but now with SD tuning…..WOW!!!! What a difference!!!.... My 402ci runs better than standard. My camshaft is a 244/250 @.050” on a 112LSA. The hot/cold starts, air on/off throttle response and direct drivability is 1000% better than I would have ever imagined. The idle is so nice now, I think I need a bigger camshaft…. lol….
Pete says in Australia, most of the good tuners only tune in Speed Density….Now I know why!!! I love my car all over again…. Thanks Pete & Sean… You guys ROCK!!!
BTW I’ve got a cheap MAF for sale!!! lol
Wash
I thought my car was as good as it gets but now with SD tuning…..WOW!!!! What a difference!!!.... My 402ci runs better than standard. My camshaft is a 244/250 @.050” on a 112LSA. The hot/cold starts, air on/off throttle response and direct drivability is 1000% better than I would have ever imagined. The idle is so nice now, I think I need a bigger camshaft…. lol….
Pete says in Australia, most of the good tuners only tune in Speed Density….Now I know why!!! I love my car all over again…. Thanks Pete & Sean… You guys ROCK!!!
BTW I’ve got a cheap MAF for sale!!! lol
Wash
Jeff--what kind of numbers are you getting from your 402--if I have to go into my lower end and resleave I was thinking it may be better and easier and probably less expensive just to go the ls2 route myself--I would think with your setup a streetable 500/500 range would be perfect and very obtainable--and SD tuning is certainly something I am interested in the weather doesn't vary that much here anyway---car is still in the shop they should paint next week which will be 4 fkg months waiting on GM etc. congrads on your ride btw I know I am preaching to the choir when it comes to waiting on it in the shop---wild bill
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From: dallas texas
Originally Posted by NEPTUNEBILL
Jeff--what kind of numbers are you getting from your 402--if I have to go into my lower end and resleave I was thinking it may be better and easier and probably less expensive just to go the ls2 route myself--I would think with your setup a streetable 500/500 range would be perfect and very obtainable--and SD tuning is certainly something I am interested in the weather doesn't vary that much here anyway---car is still in the shop they should paint next week which will be 4 fkg months waiting on GM etc. congrads on your ride btw I know I am preaching to the choir when it comes to waiting on it in the shop---wild bill
hey..if you need a block i have my darton for sale 1500 miles on the block also have the pistons too for a 427 with the 4" it just needs a bushing in the lifter bore thanks to a famous "tuner" letting it run out of oil pressure because he put the oil adaptor plates on upside down when he changed camshafts and then made 3 dyno pulls with the lifters not being pumped up...otherwise the block is in good shape lemme know ill sell it cheap yo you
Wash
Instructor
Joined: Sep 2003
Posts: 142
Likes: 1
From: Pensacola FL
Does the SD tune work well with automatics? I've heard that without a MAF on the earlier cars, like 97s and 98s, the automatic transmission pressure goes to either maximum or zero (can't remember) and can't be changed. This is done to protect the transmission when the MAF no longer reads the air. Is this true and if so, does it apply to the later Vettes?
Just to fill people in, the SD tunes work fabulously. The big turbo Supras really brought this stuff over to the US in the late 90s with the HKS VPC and GCC units (ECU piggy-backs) that eventually gave way to the AEM EMS. So, to be able to do this on the stock ECU in the C5 is pretty incredible. Bravo to the Aussies for working with the LS1 computers to help bring this to us.
Just to fill people in, the SD tunes work fabulously. The big turbo Supras really brought this stuff over to the US in the late 90s with the HKS VPC and GCC units (ECU piggy-backs) that eventually gave way to the AEM EMS. So, to be able to do this on the stock ECU in the C5 is pretty incredible. Bravo to the Aussies for working with the LS1 computers to help bring this to us.
Instructor
Joined: Sep 2003
Posts: 142
Likes: 1
From: Pensacola FL
IAT, MAP and O2 is all it uses. By interpolating the O2 (in a closed loop) and comparing to the IAT and MAP values, it can read the density of the air by the amount of fuel it adds or subtracts. If it adds more and it richens up or if it takes away fuel and it leans out, by the process of subtraction/elimination it can figure out the correct "sweet spot" amount of fuel for a predetermined and desired A/F, because it can calculate the density of the air due to the fact that it has the air temperature and barometric readings coming into the engine. Cooler air is more dense and vice versa, but so is sea level air vs mountain air. Plus, the GM computer has these VE tables built in, so it's actually a pretty solid way to go. If the computer knows the air temp, the fuel amount, the atmospheric pressure, and the A/F ratio, it can figure out the air speed/density because of those tables.
The Supras with the AEM use the GM IAT sensor with a wideband O2 sensor and a 2 or 3 Bar MAP sensor normally.
The Supras with the AEM use the GM IAT sensor with a wideband O2 sensor and a 2 or 3 Bar MAP sensor normally.
Last edited by JakeFusion; Jul 27, 2005 at 01:04 PM.