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07-19-2005, 09:14 AM
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#1
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Join Date: Jan 2005
Location: Bergenfield, north jersey
Posts: 93
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TPI question
What years were the tpi's controled by speed density and not mass air flow? and what do you think is better?
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07-19-2005, 09:23 AM
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#2
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Keyboard Tough Guy
Join Date: Jul 2004
Location: Trenton, NJ
Posts: 6,341
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Re: TPI question
Quote:
Originally Posted by Draven94blackbird
What years were the tpi's controled by speed density and not mass air flow? and what do you think is better?
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gm kept going back and forth...i know my 89 was maf but my friends 91 was SD...they both have their good & bad points...i would definitly ask fasterthanyou as to which has more potential in the long run...in ls1 cars SD tuning is like the hot thing to do now...just takes a while to get each car dialed in right but once you do they generally make more power but dont adjust to outside conditions as well nor can it compensate for new mods very well...as a new tune is required for new mods.
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07-19-2005, 09:36 AM
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#3
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Join Date: Aug 2004
Location: Hillsborough, NJ
Posts: 3,200
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I recall the MAF systems being more accurate with their readings since they took direct information from the MAF in the ECM, making the TPI units from 85-89 more fuel friendly. The Speed Density systems were from 90-92 (in the third gens) and used an average calculation in the ECM, allowing for more power in the low and mid range.
I think the Car Tech book on TPI said it best. Stacked against an LT1, TPI cars can still beat LT1's across an intersection, however the Lx1's have the better top end.
__________________
I USED TO HAVE an 85 Camaro 305 4bbl, 90 Firebird V6, 97 Firebird V6 (10 speakers!). Despite the two family vehicles, 3 kids, wife and mortgage, I can finally realize the dream - 88 TA almost all stock... for now.
http://www.cardomain.com/id/untameddave
Wanted this - , but ended up with this - for free. Can't argue with free.
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07-19-2005, 10:07 AM
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#4
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Keyboard Tough Guy
Join Date: Jul 2004
Location: Trenton, NJ
Posts: 6,341
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in the end the maf is just one more restriction in the intake track...without it stock for stock the non maf car should make more power.
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07-19-2005, 10:21 AM
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#5
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12 Second Club
Join Date: Aug 2004
Location: Oradell
Posts: 8,368
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85-90 maf 91-92 SD
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86 Camaro
88 Camaro
95 Impala SS
97 Trans Am WS6
98 Blazer ZR2
00 Corvette
04 CTS-V
07 Sublime Charger Daytona
10 Tahoe SSV
12 Tahoe LT
17 Malibu LT
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07-19-2005, 02:27 PM
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#6
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11 Second Club
Join Date: Jan 2005
Location: Fishkill, NY
Posts: 1,278
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Quote:
Originally Posted by foff667
in the end the maf is just one more restriction in the intake track...without it stock for stock the non maf car should make more power.
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Possibly, but with a MAF it compensates better foor poor weather conditions, altitude changes, ETC. I think they both have their ups and downs but Ilike the MAF systems better for a street car.
__________________
-Nick
9/11/01- Never Forget
2002 Pontiac Trans-Am WS6 # 206
Chasing 10's
469RWH/437RWTQ
11.05 @ 123
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07-19-2005, 02:44 PM
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#7
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Keyboard Tough Guy
Join Date: Jul 2004
Location: Trenton, NJ
Posts: 6,341
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Quote:
Originally Posted by Batman
Quote:
Originally Posted by foff667
in the end the maf is just one more restriction in the intake track...without it stock for stock the non maf car should make more power.
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Possibly, but with a MAF it compensates better foor poor weather conditions, altitude changes, ETC. I think they both have their ups and downs but Ilike the MAF systems better for a street car.
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"but dont adjust to outside conditions as well nor can it compensate for new mods very well" i think thats what i said?
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07-19-2005, 02:49 PM
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#8
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Co-Founder / Site Admin
Join Date: Jul 2004
Location: Ewing, NJ
Posts: 22,473
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Quote:
Originally Posted by Batman
Quote:
Originally Posted by foff667
in the end the maf is just one more restriction in the intake track...without it stock for stock the non maf car should make more power.
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Possibly, but with a MAF it compensates better foor poor weather conditions, altitude changes, ETC. I think they both have their ups and downs but Ilike the MAF systems better for a street car.
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My speed density car runs the same in all weather condidtions.......like KOLL
- Justin
__________________
1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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