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maf or speed denstiy

Old 03-18-2013 | 05:45 PM
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From: slater sc
Car: 1989 camaro iroc
Engine: 350 tpi
Transmission: auto
Axle/Gears: 323
maf or speed denstiy

what is better and how hard is to switch to the speed den from maf on a 85 tpi that is a 305 but will soon be a 350 ?
Old 03-18-2013 | 05:50 PM
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Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: maf or speed denstiy

Originally Posted by tcrisp
what is better ?
Depends

Originally Posted by tcrisp
how hard is to switch to the speed den from maf
Not hard with a 86 - 89 ECM
http://www.eecis.udel.edu/~davis/z28/ecm_swap_730/

but you have the one year only 85 ECM that requires more mods
Would be easier to get the complete wiring / ECM from a SD car
Old 03-18-2013 | 05:58 PM
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From: slater sc
Car: 1989 camaro iroc
Engine: 350 tpi
Transmission: auto
Axle/Gears: 323
Re: maf or speed denstiy

so i just need to get a 86 -89 ecm and can i still use my wire hanress or do i need to get ecm and the wire harnees?
Old 03-18-2013 | 06:39 PM
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From: slater sc
Car: 1989 camaro iroc
Engine: 350 tpi
Transmission: auto
Axle/Gears: 323
Re: maf or speed denstiy

So after looking at the info will a be better off building a 350 tpi like a 85 350 tpi vette. because i just want a stock 350 that way i want have to mess with ecm but change out the two chips in I just want that torque 330 ftlb. i think that what they had in a 85 tpi 350.
Old 03-18-2013 | 07:18 PM
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Car: 85 Z28 T-Top 36mm sway & wonderbar
Engine: TPI L98 350 W/85 Vette Stage II ECM
Transmission: W/C T-5, alum drive shaft
Axle/Gears: 9 bolt posi, 3:27, PBR's, BB LS1's
Re: maf or speed denstiy

Originally Posted by tcrisp
So after looking at the info will a be better off building a 350 tpi like a 85 350 tpi vette. because i just want a stock 350 that way i want have to mess with ecm but change out the two chips in I just want that torque 330 ftlb. i think that what they had in a 85 tpi 350.

I did that with my 85 Z28 with a new L98 engine. I found a 85 Vette 4+3 ECM (manual shift) ECM on a Internet search and I went with 24lb Bosch III injectors, ESC module for a 350, knock sensor for a 350, BBK 52mm throttle body and under drive pulleys. The MAF and wiring are stock setup. It scoots down the road pretty good.

Last edited by 85 ZXX; 03-18-2013 at 07:54 PM.
Old 03-18-2013 | 07:33 PM
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Re: maf or speed denstiy

Given what you are trying to do with the car, converting to a speed density TPI system
seems illogical. Mass air flow TPI's being more forgiving to light-to-moderate modifications seems like the logical choice. Since you are just chasing after the torque numbers, id choose the path of least resistance.. Which would be to ulitilize what you have with the '85 harness and ECM and go from there.
Old 03-19-2013 | 04:16 PM
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From: slater sc
Car: 1989 camaro iroc
Engine: 350 tpi
Transmission: auto
Axle/Gears: 323
Re: maf or speed denstiy

thanks guy that what i will do is buidl it like a 85 350 tpi vette. because i do not want to buy a ecm and all the other stuff. Make it easy as swap has possible.
Old 03-19-2013 | 05:35 PM
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Car: 85 Z28 T-Top 36mm sway & wonderbar
Engine: TPI L98 350 W/85 Vette Stage II ECM
Transmission: W/C T-5, alum drive shaft
Axle/Gears: 9 bolt posi, 3:27, PBR's, BB LS1's
Re: maf or speed denstiy

Good! The ECM is the same, basically the two chips, ESC, Knock sensor and 21lb-24lb injectors. The Bosch III's are nice. I stocked up on the ECM's for my 85 just in case I have some problems on down the road... If you get a one piece main rear seal 350, don't forget to elongate the four center bolt holes on the intake manifold. The bolt angles are different from the older two piece rear main engines like your original. You can see some pics of mine on my signature links below.
Old 03-19-2013 | 05:46 PM
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From: slater sc
Car: 1989 camaro iroc
Engine: 350 tpi
Transmission: auto
Axle/Gears: 323
Re: maf or speed denstiy

Did you use roller cam or a non roller cam .
Old 03-19-2013 | 06:57 PM
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Car: 85 Z28 T-Top 36mm sway & wonderbar
Engine: TPI L98 350 W/85 Vette Stage II ECM
Transmission: W/C T-5, alum drive shaft
Axle/Gears: 9 bolt posi, 3:27, PBR's, BB LS1's
Re: maf or speed denstiy

The engine I have is a roller cam L98 one piece rear main. 1987 and up.
Old 03-19-2013 | 07:15 PM
  #11  
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From: slater sc
Car: 1989 camaro iroc
Engine: 350 tpi
Transmission: auto
Axle/Gears: 323
Re: maf or speed denstiy

So i have a one piece rear main 350 block that am going use. will the 85 ecm be able to use a roller cam and not have any issue or will i need to stick with the non roller cam. if i understand that you have a 85 ecm and you are running a roller cam does it matter. sorry for all the questions just trying to get has much info before i start building the motor
Old 03-19-2013 | 08:06 PM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: maf or speed denstiy

you should really upgrade to the 1227165 ecm the 870 is a piece of junk. You will have so much better throttle response.
Old 03-19-2013 | 08:26 PM
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Car: 85 Z28 T-Top 36mm sway & wonderbar
Engine: TPI L98 350 W/85 Vette Stage II ECM
Transmission: W/C T-5, alum drive shaft
Axle/Gears: 9 bolt posi, 3:27, PBR's, BB LS1's
Re: maf or speed denstiy

Originally Posted by tcrisp
So i have a one piece rear main 350 block that am going use. will the 85 ecm be able to use a roller cam and not have any issue or will i need to stick with the non roller cam. if i understand that you have a 85 ecm and you are running a roller cam does it matter. sorry for all the questions just trying to get has much info before i start building the motor
It does fine...I have no hesitation, I have 193 heads on it with a stock L98 roller cam. The way I understand is that you just want to have a little more power on the pavement and not having to invest a fortune in upgrades.
Old 03-19-2013 | 09:01 PM
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Car: 85 Z28 T-Top 36mm sway & wonderbar
Engine: TPI L98 350 W/85 Vette Stage II ECM
Transmission: W/C T-5, alum drive shaft
Axle/Gears: 9 bolt posi, 3:27, PBR's, BB LS1's
Re: maf or speed denstiy

You can go this route if you want a new setup:

http://performanceparts.com/part/Pai...firmmobile=yes

It might not work with a 700 R4 transmission though.

Last edited by 85 ZXX; 03-19-2013 at 09:05 PM.
Old 03-19-2013 | 10:16 PM
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: maf or speed denstiy

Originally Posted by 85 ZXX
I stocked up on the ECM's for my 85 .
Problem is not the '870 ECM but the almost impossible to find , $150+ when you can used ,burn off module unique to a 85 that was replaced with a couple of $12 relays on the '165 MAF cars

Originally Posted by 85 ZXX
If you get a one piece main rear seal 350, don't forget to elongate the four center bolt holes on the intake manifold.
Intake bolt angle relates to head style (centerbolt or not ) ; not the block style
Old 03-20-2013 | 03:53 PM
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Car: 85 Z28 T-Top 36mm sway & wonderbar
Engine: TPI L98 350 W/85 Vette Stage II ECM
Transmission: W/C T-5, alum drive shaft
Axle/Gears: 9 bolt posi, 3:27, PBR's, BB LS1's
Re: maf or speed denstiy

Originally Posted by vetteoz
Problem is not the '870 ECM but the almost impossible to find , $150+ when you can used ,burn off module unique to a 85 that was replaced with a couple of $12 relays on the '165 MAF cars

Intake bolt angle relates to head style (centerbolt or not ) ; not the block style
I did mention that I had 193 heads and a 87-up L98 engine
Old 03-20-2013 | 04:04 PM
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Car: 85 Z28 T-Top 36mm sway & wonderbar
Engine: TPI L98 350 W/85 Vette Stage II ECM
Transmission: W/C T-5, alum drive shaft
Axle/Gears: 9 bolt posi, 3:27, PBR's, BB LS1's
Re: maf or speed denstiy

I seriously doubt that he will use his 85 305 heads on a newer 350 block that he is building...LOL!!!
Old 03-20-2013 | 06:40 PM
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From: slater sc
Car: 1989 camaro iroc
Engine: 350 tpi
Transmission: auto
Axle/Gears: 323
Re: maf or speed denstiy

I have a 2 set of heads to choose from 193 and 810 think that is the casting number .I just need to know if i go with the 870 ecm and use a non roller cam and build it just like a85 vette tpi using the 1 peice rear seal and change out the chips i will be fine . also the guy at tpiparts said i would be fine doing that and changing out injector , esc ,knock sensor i sure be fine.
Old 03-20-2013 | 09:10 PM
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Car: 85 Z28 T-Top 36mm sway & wonderbar
Engine: TPI L98 350 W/85 Vette Stage II ECM
Transmission: W/C T-5, alum drive shaft
Axle/Gears: 9 bolt posi, 3:27, PBR's, BB LS1's
Re: maf or speed denstiy

Absolutely, I like my 193's... I may invest in a 100-150HP shot NOS setup for my TPI just for a little giddy up every now and then.
Old 03-20-2013 | 09:15 PM
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From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: maf or speed denstiy

the esc will have letters or a part number on it and will work on several engines with the correct knock sensor. 16126761 (ANRZ) is discontinued. Replaced with HKR for the 4.3l & 5.7L engines, and HKM for the 5.0l engines.
16022621 (BLH), is for 2.8l, 5.0l, and 5.7l engines.

You will need to buy a new knock sensor though.
Old 03-20-2013 | 09:16 PM
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Car: 85 Z28 T-Top 36mm sway & wonderbar
Engine: TPI L98 350 W/85 Vette Stage II ECM
Transmission: W/C T-5, alum drive shaft
Axle/Gears: 9 bolt posi, 3:27, PBR's, BB LS1's
Re: maf or speed denstiy

The 870 is slow for real time data logging on a laptop but it works.
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