Speed Density..pros and cons?
11-06-2005, 07:16 AM
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Speed Density..pros and cons? I keep hearing about this and i am considering it for a Ls1 heads/cam setup for my '87 GTA....
What are the pros and cons of Speed Density tuning?
The biggest question is will it be suitable for a daily driver?
Thanks
What are the pros and cons of Speed Density tuning?
The biggest question is will it be suitable for a daily driver?
Thanks
11-06-2005, 01:49 PM
#2
I you consider that many manufacturers only tune their cars in Speed Density (like Chrysler), yes SD is perfectly acceptable for daily driving. In fact, the MAF's biggest advantage, is to be able to tell the PCM of changes to incoming airflow in the motor as the vehicle ages.
The biggest advantage of SD is that you can run a camshaft with lots more overlap and not worry about the MAF freaking out because of intake manifold reversion. This has to be one of the biggest problems in driveability when running a big cam. SD can make a big cammed motor idle and drive like a pussycat.
The biggest advantage of SD is that you can run a camshaft with lots more overlap and not worry about the MAF freaking out because of intake manifold reversion. This has to be one of the biggest problems in driveability when running a big cam. SD can make a big cammed motor idle and drive like a pussycat.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
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11-06-2005, 02:07 PM
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Thats the way my cars' done..Another con' is that, your car/PCM wont adjust with the weather when it's done it SD, and everytime you make a change(mod) to your setup, you'll have to tune for it..(i think.)
11-06-2005, 02:11 PM
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Does anyone have a list of tuners on the SE that can do a SD tune?
I really want to have this done to my car but, don't have the equipment or time to do it all myself.
I really want to have this done to my car but, don't have the equipment or time to do it all myself.
11-06-2005, 05:59 PM
#5
Originally Posted by flyinZ
Thats the way my cars' done..Another con' is that, your car/PCM wont adjust with the weather when it's done it SD, and everytime you make a change(mod) to your setup, you'll have to tune for it..(i think.)
11-06-2005, 06:16 PM
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Originally Posted by flyinZ
Thats the way my cars' done..Another con' is that, your car/PCM wont adjust with the weather when it's done it SD, and everytime you make a change(mod) to your setup, you'll have to tune for it..(i think.)
11-06-2005, 11:09 PM
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So does SD tuning get rid of the maf all together?
Is this something thats good only for an N/A setup or will it work good with nitrous also?
The cam i have is (232/240 .588/.610 112+2 XER grind)
Thanks for the replys... Patrick...I believe i read one of your dyno comparison threads that you did this on...were their any gains doing this? Thunder was doing your tuning right?
Is this something thats good only for an N/A setup or will it work good with nitrous also?
The cam i have is (232/240 .588/.610 112+2 XER grind)
Thanks for the replys... Patrick...I believe i read one of your dyno comparison threads that you did this on...were their any gains doing this? Thunder was doing your tuning right?
Last edited by HartAttack; 11-07-2005 at 02:03 AM.
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11-07-2005, 12:08 AM
#8
nitrous is usually tuned in with th jets..so its just fine for an N2O car
teh biggest benefit from SD is throttle response....since the VE was designed for transient response it only makes sense that you will get better throttle response from it
and the bigger the cam...the more I tend to like SD
teh biggest benefit from SD is throttle response....since the VE was designed for transient response it only makes sense that you will get better throttle response from it
and the bigger the cam...the more I tend to like SD
11-07-2005, 07:59 AM
#9
Originally Posted by HartAttack
So does SD tuning get rid of the maf all together?
Is this something thats good only for an N/A setup or will it work good with nitrous also?
The cam i have is (232/240 .588/.610 112+2 XER grind)
Thanks for the replys... Patrick...I believe i read one of your dyno comparison threads that you did this on...were their any gains doing this? Thunder was doing your tuning right?
Is this something thats good only for an N/A setup or will it work good with nitrous also?
The cam i have is (232/240 .588/.610 112+2 XER grind)
Thanks for the replys... Patrick...I believe i read one of your dyno comparison threads that you did this on...were their any gains doing this? Thunder was doing your tuning right?
Patrick
11-07-2005, 09:19 AM
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Originally Posted by Patrick G
SD tuning gets rid of the MAF all together. When I got rid of my 85mm MAF, I gained 1 KPa of manifold vaccum at WOT. I believe this was responsible for around a 5 rwhp gain (vs running the more restrictive MAF). The driving manners of running a MAF vs speed density is night and day with my car now. No going back.
Patrick
Patrick
I am putting this motor into my '87 GTA...i wanted to just put a K&N cone right on the TB..i guess with SD i can no problem huh? That sounds great.
What makes the driving night and day over having a maf? Do you have any comparisons on dyno sheets like everything else you post?
I know you like to go to Thunder for most things..do you recommend them for SD tuning as well?
Thanks!
11-07-2005, 10:42 AM
#12
my car is SD and i drive about 200 miles a week. i get great gas mileage and besides a few bugs the car runs great. ive seen about 60* swing in temps in my tunes and the trims didnt change more than they would driving around all day in the same temp. i think before 96 most gm cars didnt even have MAF
11-07-2005, 03:37 PM
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GM started out with MAF's in the early TPI cars ('84-'85), but switched around '87-'88 to SD since the MAF units kept breaking. They stayed SD until 92-94 when some cars started using MAF's again. TBI, 2nd GEN TPI, CPFI, etc. was SD. I think the contributor was sequential injection. That main shift of technology possibly mandated the extra control.
11-07-2005, 05:43 PM
#15
Originally Posted by oange ss
so if I stick to SD tune, then I'm stuck with only one timing table ? ie no high octane table
