They can't answer my question: can you??
Thread Starter
Supreme Member
Joined: May 2002
Posts: 1,333
Likes: 1
From: Texas
Car: 1991 Z28 Convertible
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: 3.23 with Eaton posi
They can't answer my question: can you??
Here is a link to a crate motor I'm considering. But, in the descrip, it says it works best on 87-89 camaros. I have 91 TPI. When I asked them why it would work on 87-89 better, the tech dept told me that it would fit my car but the engine was designed for those previous years. Anyone know why?? What is the difference between the 87-89 350 TPI vs the 91 TPI??
http://www.goautocenter.com/300hp_tpi_1987-89.htm
http://www.goautocenter.com/300hp_tpi_1987-89.htm
Supreme Member
Joined: May 2000
Posts: 2,963
Likes: 3
Car: 1982 Z28
Engine: LS1
Transmission: T56
The newer TPI engines came with flat-top pistons, yielding higher compression than the older engines' dished-top pistons. Your fuel and spark tables are designed for this...putting in an engine w/ less compression will cost you in power output.
Thread Starter
Supreme Member
Joined: May 2002
Posts: 1,333
Likes: 1
From: Texas
Car: 1991 Z28 Convertible
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: 3.23 with Eaton posi
thanks ....thats what I needed to know. It was either that engine or the 350 TPI w/ Vortech heads from SDPC. GUess I know which way to go now.
Joined: Mar 2000
Posts: 43,187
Likes: 43
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Unfortunately, it's just not true.
The later TPI systems were speed density, vs. the mass air flow of the earlier. Compression was always 9.3:1.
About the only difference inside the engines was the cam, and those differences were slight. However, the MAF system is more forgiving about changes to the basic engine; which is offset by the SD being more capable of handling higher HP with PROM tuning.
Go for the engine, put headers on it, and get yourself some PROM burning equipment.
The later TPI systems were speed density, vs. the mass air flow of the earlier. Compression was always 9.3:1.
About the only difference inside the engines was the cam, and those differences were slight. However, the MAF system is more forgiving about changes to the basic engine; which is offset by the SD being more capable of handling higher HP with PROM tuning.
Go for the engine, put headers on it, and get yourself some PROM burning equipment.
Supreme Member
Joined: May 2000
Posts: 2,963
Likes: 3
Car: 1982 Z28
Engine: LS1
Transmission: T56
Originally posted by five7kid
Unfortunately, it's just not true.
The later TPI systems were speed density, vs. the mass air flow of the earlier. Compression was always 9.3:1.
About the only difference inside the engines was the cam, and those differences were slight. However, the MAF system is more forgiving about changes to the basic engine; which is offset by the SD being more capable of handling higher HP with PROM tuning.
Go for the engine, put headers on it, and get yourself some PROM burning equipment.
Unfortunately, it's just not true.
The later TPI systems were speed density, vs. the mass air flow of the earlier. Compression was always 9.3:1.
About the only difference inside the engines was the cam, and those differences were slight. However, the MAF system is more forgiving about changes to the basic engine; which is offset by the SD being more capable of handling higher HP with PROM tuning.
Go for the engine, put headers on it, and get yourself some PROM burning equipment.
With all that hardware you still can't get into the 13.0's...go read a book or something.
Supreme Member
Joined: Nov 2001
Posts: 2,743
Likes: 0
From: heartland
Car: 89rs (previous 2.8)
Engine: 406
Transmission: 700r4 (for now)
OUCH!!!!
Originally posted by kevinc
Dude, you're fairly knowledgeable and all, but I've seen two unmolested factory L98s from '91-92 and they had 4 VR flat-tops.
With all that hardware you still can't get into the 13.0's...go read a book or something.
Dude, you're fairly knowledgeable and all, but I've seen two unmolested factory L98s from '91-92 and they had 4 VR flat-tops.
With all that hardware you still can't get into the 13.0's...go read a book or something.
Thread Starter
Supreme Member
Joined: May 2002
Posts: 1,333
Likes: 1
From: Texas
Car: 1991 Z28 Convertible
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: 3.23 with Eaton posi
Well here is the reply from the tech dept. :
" The 300hp TPI engine is emission tested for the 1987-89 Camaro. You
may want a milder cam for the 1991 Camaro. Going from a 305 to a 350
you will need to upgrade to an adjustable fuel
pressure regulator and/ or larger injectors and the chip will need to
be changed to a 350 TPI chip.
regards,
tech "
looks like five7kid was right about the cam......
" The 300hp TPI engine is emission tested for the 1987-89 Camaro. You
may want a milder cam for the 1991 Camaro. Going from a 305 to a 350
you will need to upgrade to an adjustable fuel
pressure regulator and/ or larger injectors and the chip will need to
be changed to a 350 TPI chip.
regards,
tech "
looks like five7kid was right about the cam......
Trending Topics
Member
Joined: Dec 2002
Posts: 134
Likes: 0
From: Florida
Car: 88 Iroc
Engine: 350
Transmission: 700r4
Originally posted by five7kid
Unfortunately, it's just not true.
Compression was always 9.3:1.
Unfortunately, it's just not true.
Compression was always 9.3:1.
Thread
Thread Starter
Forum
Replies
Last Post
HoosierinWA
Tech / General Engine
5
Oct 7, 2015 10:15 AM