91 formula
08-24-2010, 04:51 AM
#1
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91 formula I was wondering if it would be worth it to build a tt 305 yeah I know it's a 305 but would it be worth it I just got a 91 formula it has a 305tpi vortech heads a zz4 cam and I was wondering if it would be worth it to add a twin turbo set up to it or just swap it out with a 350 a nitrous or keep the 305 and add a nitrous kit to it??
08-24-2010, 06:37 PM
#2
tpi's have long runners which I heard helps with turbos.
I say go for it and put some twins on it. There is a way to put an lsx computer on there with the tpi, so you pick up some tunability.
Check out gm high tech performance magazine's website. There is a guy named Tim with a white 91/92 formula 350 running 10.8 1/4 mile times with street tires on his mostly stock tpi.
The tpi's were designed for a 305 not a 350 and I'm pretty sure in stock trim everything is more properly matched to a smaller displacement motor.
I say go for it and put some twins on it. There is a way to put an lsx computer on there with the tpi, so you pick up some tunability.
Check out gm high tech performance magazine's website. There is a guy named Tim with a white 91/92 formula 350 running 10.8 1/4 mile times with street tires on his mostly stock tpi.
The tpi's were designed for a 305 not a 350 and I'm pretty sure in stock trim everything is more properly matched to a smaller displacement motor.
08-24-2010, 10:15 PM
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I say spray the crap out of it. When I had the 305 in mine it was built similar to your's on a 150 it ran 11.8s at 3650lbs. I sprayed 200 on it but never ran it at the track.
08-25-2010, 06:10 AM
#4
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I think Im just going to try spraying the hell out of it and if not satisfied I might do the twins.. What was you set up when u were spraying ?? And what would I need to up grade and what kind of tune did u have on it if any?? I'm really interested let me know please
08-25-2010, 11:03 PM
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Before you think about boost, think about how you are going to control the fuel/spark side of things and how comfortable you are doing that with what is available and for how much.
08-27-2010, 07:40 AM
#6
A few things to consider....
The 305 has relatively restrictive heads & larger sets are not practical due to the small bore size, thus limiting power.
The stock TPI intake is very restrictive above 4500rpm & other than adding low end torque (& looking cool of course), is not the way to make good power.
The 305 does not have much in the way of strong rods or bottom end components, so spending a few thousand only to have it grenade may not be the best way to invest your money.
Recently saw a local guy build a twin turbo 406 (conventional SBC) with mild heads & cam, that went 9's at over 140mph, on low boost & stock rear.
The 305 has relatively restrictive heads & larger sets are not practical due to the small bore size, thus limiting power.
The stock TPI intake is very restrictive above 4500rpm & other than adding low end torque (& looking cool of course), is not the way to make good power.
The 305 does not have much in the way of strong rods or bottom end components, so spending a few thousand only to have it grenade may not be the best way to invest your money.
Recently saw a local guy build a twin turbo 406 (conventional SBC) with mild heads & cam, that went 9's at over 140mph, on low boost & stock rear.
