88 Iroc Convertible Detuned????
11-14-2003, 09:02 AM
#1
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Join Date: Mar 2002
Location: Philadelphia, PA
Posts: 14
88 Iroc Convertible Detuned????
Why is the 305 TPI automatic in an 88 Iroc Convertible have such a lower rating (195 vs 220) than a 305 TPI automatic in non-convertibles?
What was changd? Is it just a change in chip to get it back to 220?
What was changd? Is it just a change in chip to get it back to 220?
11-14-2003, 02:08 PM
#2
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Join Date: Dec 1999
Location: MD
Posts: 2,022
Where are you getting the HP ratings from?
The difference between the 195HP 305 and 220HP 305 in 88 had to do with the manual trans/G92 optional gear ratio package. They got a more aggressive camshaft. The autos got the weaker "peanut" cam. That was the 25HP difference. The convertible option had nothing to do with it.
Goto http://www.thirdgen.org/newdesign/tech/techdb.shtml for more info...
The difference between the 195HP 305 and 220HP 305 in 88 had to do with the manual trans/G92 optional gear ratio package. They got a more aggressive camshaft. The autos got the weaker "peanut" cam. That was the 25HP difference. The convertible option had nothing to do with it.
Goto http://www.thirdgen.org/newdesign/tech/techdb.shtml for more info...
11-14-2003, 03:27 PM
#4
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Location: San Francisco, California United States
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If you are going to change the cam, you might as well swap in some headers, 3" exhaust, and some other goodies while you are it. A cam is not a hard swap, but it is quite an undertaking none-the-less. And you can always add a nicer cam if you are looking for power. I think the 305 5spds just got the 350 TPI cam where as the 305 A4's got a totally different, weaker cam. Shop around.
Will
Will
Last edited by stanghunter211; 11-14-2003 at 03:31 PM.
11-15-2003, 06:27 PM
#6
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Join Date: Dec 1969
Location: Stavanger, Norway
Posts: 26
I put a Comp Cam, some WP 305 S/R Torquer heads, some SLP runners and a full Edelbrock exhaust etc. on my 305TPI 'vert, and it sure as heck woke it up 
Don't have any actual numbers, but the Desktop Dyno said roughly 290hp, but I do not know how close that is to the truth. It did make a major difference though!
Ken
Don't have any actual numbers, but the Desktop Dyno said roughly 290hp, but I do not know how close that is to the truth. It did make a major difference though!Ken
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