Speed Density?!?
TECH Regular
Joined: Sep 2006
Posts: 474
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From: MI
huh? I thought the 93 had a slightly larger cam, more choked exhuast, and less flowing heads than Irons- or the very late castings. but the 93 was a MAF-less system, so it has to calculate how much air is being flowed by MAP signal, and other sensors, instead of the MAF monitoring it. there is a guy with a fleetwood who removed his MAF, because(i think) he felt that the car ran better without, and just tuned accordingly.
I do not believe the 93 is faster. Speed density means the air usage is calculated based off MAP and IAT rather than measured with a MAF. Simple changes like cams that affect vacuum readings therefore require much more extensive reprogramming to get the tables used for the calculations back in line.
The MAF system is much more adaptive and easier to tune, keep it unless you are looking for something WILD. If you do endup looking for 9s NA or something the 95 pcm can be tuned for speed density and you retain the wonderful flash memory rather than the chips of the 93 system though I think you can get "realtime" tunable systems to work with the 93 setup.
The MAF system is much more adaptive and easier to tune, keep it unless you are looking for something WILD. If you do endup looking for 9s NA or something the 95 pcm can be tuned for speed density and you retain the wonderful flash memory rather than the chips of the 93 system though I think you can get "realtime" tunable systems to work with the 93 setup.
Originally Posted by Mens Rea
What is this exactly that makes the '93 LT1 faster than the others, stock for stock?
That is just another internet myth. I have probably dyno tested as many LT1 cars as anybody in the country, and I can tell you they certainly don't make any more power than the later models.
Joined: Nov 2001
Posts: 10,023
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From: LT1 land...the "409" of the 90s!
Originally Posted by Ed Wright
That is just another internet myth. I have probably dyno tested as many LT1 cars as anybody in the country, and I can tell you they certainly don't make any more power than the later models.
THANK YOU ED!! with maf readings you sometimes lose throttle response because of it. many shops will tune it but there is only so much you can do. where as a speed density has to much more exact and if done correctly will actually give you more power. but stock for stock there is no truth to that myth but in racing applications you will see people running speed density for the throttle response.
Originally Posted by borninatransam
with maf readings you sometimes lose throttle response because of it. many shops will tune it but there is only so much you can do. where as a speed density has to much more exact and if done correctly will actually give you more power. but stock for stock there is no truth to that myth but in racing applications you will see people running speed density for the throttle response.
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Originally Posted by borninatransam
with maf readings you sometimes lose throttle response because of it. many shops will tune it but there is only so much you can do. where as a speed density has to much more exact and if done correctly will actually give you more power. but stock for stock there is no truth to that myth but in racing applications you will see people running speed density for the throttle response.
I don't know what you are smoking, but it must be some good ****! I have had my cars both ways. I'm using speed density right now. You have evidently been reading the pcm tuning section. A lot of butt dynoes need re-calibrated over there. Even at 500 rwhp, speed density is only worth 5 or 6 rwhp. NOBODY can feel 5 or 6o rwhp on a 500 rwhp car. You can imagine it, but you can't really feel it. The power of sugestion is a wonderful thing.
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Teching In
Joined: Apr 2006
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Originally Posted by borninatransam
with maf readings you sometimes lose throttle response because of it. many shops will tune it but there is only so much you can do. where as a speed density has to much more exact and if done correctly will actually give you more power. but stock for stock there is no truth to that myth but in racing applications you will see people running speed density for the throttle response.
Is it really worth the hassle of tuning a speed density system for 5-8 hp? i don't think so
Originally Posted by 97WS6NY
Is it really worth the hassle of tuning a speed density system for 5-8 hp? i don't think so
Hope everybody has a nice weekend.
Teching In
Joined: Apr 2006
Posts: 30
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Originally Posted by Ed Wright
Nor do I. Only if you race it. Your talking a couple hundredths at best in the 1/4 mile. Speed density cars are more sensitive to air & temp changes. I have a ton of time working with tables that had little effect with a MAF, just to stop my track times from changing so much when the weather changed. I think a lot of guys do that just because they can, and think they it sounds cool to tell about it. Like bigger injectors than you need. Sounds cool to the kids at the Sonic to hear you have 75lb injectors. Even if 30lbs would be plenty.
Hope everybody has a nice weekend.
Hope everybody has a nice weekend.
