Am i missing anything?
12-13-2006, 07:19 PM
#1
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Join Date: Nov 2006
Posts: 96
Am i missing anything?
Alright i bout a 91 tpi350 a little while ago.. now the HP for stock i am not sure but thats what is was... since then i have put new plug wires new plugs, also hooker super competition headers with 3 inch flowmasters, a holley high flow throttle body and a edlebrock high flow intake manifold and a fast chip stage 2 and getting 3.73 gears. is there anything else i should be getting to round all this out.. somtimes you put things on and need to do something else to finish the job if you know what i mean.... help me out if you can. im looking to be done for a little while. is it time to get new injectors fuel pump? or ignition idk let me know
12-16-2006, 09:28 PM
#4
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Join Date: Dec 1969
Location: Phila., PA
Posts: 1,150
Porting out the stock plenum and a good set of large-diameter intake runners (Eddys to match your Eddy high flow intake) would be a good complement to the rest of the mods you have done. The TPI system was really designed around the little 305 so on a 350 everything really needs to be a bit bigger to work well.
From there it's basically your typical "free mods" like bypassing TB coolant lines, dropping in a slightly colder (180*) stat, bumping up the initial timing from 6* stock to about 10*, relocating the MAT (Malifold Air Temp) sensor from it's position in the floor of the intake plenum up into the cooler air filter box, gutting the baffles out from under the filter box area and getting rid of at least the rear screen from the MAF sensor. All of those changes will resut in modest improvement alone but a nice improvement done together.
You have at least upgraded the entire exhaust- that's a real good first step as it's very restrictive from the factory.
Injectors and fuel pump I probably wouldn't bother with at your current level of mods. The fuel pump I'd just make sure it's holding full pressure at WOT throughout the RPM range on a WOT pass (about 43PSI). If it is, you've got enough fuel pump for now. If you want to buy an adjustable fuel pressure regulator you can also try that. Near-stock TPI engines often respond favorably to higher than stock fuel pressures (about 47-50 PSI) which basically makes the injectors act a smidge larger than they are (22lb. injectors are stock in a 350 TPI). Again, make sure your fuel pump can actually hold this pressure throughout a run or you're working against yourself.
I've found that even stock TPI engines like 1.6 rocker arms with their rather low-lift stock cam. Might also want to keep that in mind as another bolt-on upgrade.
A higher stall converter (~2800) along with those steeper 3.73 gears really helps at the dragstrip, too. Just make sure you get your tranny built to give you firm, if not "gunshot" shifts and you can have a pretty formidable combination.
Using everything I listed above (except I used SLP runners and and SLP chip in teh computer), along with sticky tires I ran bottom basement 13s with an old 87 L98 many years ago.
From there it's basically your typical "free mods" like bypassing TB coolant lines, dropping in a slightly colder (180*) stat, bumping up the initial timing from 6* stock to about 10*, relocating the MAT (Malifold Air Temp) sensor from it's position in the floor of the intake plenum up into the cooler air filter box, gutting the baffles out from under the filter box area and getting rid of at least the rear screen from the MAF sensor. All of those changes will resut in modest improvement alone but a nice improvement done together.
You have at least upgraded the entire exhaust- that's a real good first step as it's very restrictive from the factory.
Injectors and fuel pump I probably wouldn't bother with at your current level of mods. The fuel pump I'd just make sure it's holding full pressure at WOT throughout the RPM range on a WOT pass (about 43PSI). If it is, you've got enough fuel pump for now. If you want to buy an adjustable fuel pressure regulator you can also try that. Near-stock TPI engines often respond favorably to higher than stock fuel pressures (about 47-50 PSI) which basically makes the injectors act a smidge larger than they are (22lb. injectors are stock in a 350 TPI). Again, make sure your fuel pump can actually hold this pressure throughout a run or you're working against yourself.
I've found that even stock TPI engines like 1.6 rocker arms with their rather low-lift stock cam. Might also want to keep that in mind as another bolt-on upgrade.
A higher stall converter (~2800) along with those steeper 3.73 gears really helps at the dragstrip, too. Just make sure you get your tranny built to give you firm, if not "gunshot" shifts and you can have a pretty formidable combination.
Using everything I listed above (except I used SLP runners and and SLP chip in teh computer), along with sticky tires I ran bottom basement 13s with an old 87 L98 many years ago.
12-17-2006, 05:58 PM
#6
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Join Date: Sep 1999
Location: MI
Posts: 2,342
A high quality 2800-3000rpm converter and STICKY tires for your stock rims helps a torquey TPI car out more than anything. I'd reccomend Nitto Drag radials if you drive in the rain sometimes or Mickey Thompson Et Drag Radials if it's more of a nice weather car. Both come in 255/50/16 sizes I believe, or something close to that. It makes a car that can fry the tires into a car that can almost lift the front tires. Goodluck!
12-17-2006, 06:21 PM
#7
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Join Date: Oct 2006
Location: northern indiana
Posts: 579
check to see if your throttle body has coolant hoses going into the bottom, if they do loop them. get a new fan switch to compliment the 180 t-stat. you can look in the napa sensor catalog and get one for around $15. instead of $40. get a trans go 700r4 bump shift eliminator kit (also known as a shift kit) and love that trans. damon is right on the money
1969 chevelle 12.93 at 104 with q-jet
1969 chevelle 12.93 at 104 with q-jet
12-18-2006, 08:06 PM
#8
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Join Date: Nov 2000
Location: MI
Posts: 3,978
converter would be most noticeable on that car if you already have a gear. good suspension will make it more fun to drive on the road. as for the motor don't waste your time unless it needs them. the gm ignition is plenty good for that motor. the few things you already bought really don't make too much of a difference either. just make sure the car is in good running shape and leave the motor alone. if your desperate just remember more air and fuel makes more power, you'll figure it out from there.
12-18-2006, 10:37 PM
#9
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Join Date: Nov 2005
Location: Center Point, Texas
Posts: 701
BBK adj. Fuel pressure regulator would help
http://youtube.com/watch?v=2_wd0wH22fk
http://youtube.com/watch?v=2_wd0wH22fk
Last edited by 1987IROC350; 12-18-2006 at 10:40 PM.
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