1985 c4
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Joined: Mar 2009
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1985 c4
hey guys new to the fourm need some help just picked up a 85 c4 with 75,000 miles on it black on red
here is some work iv done
1. vortex intake
2. hypertech chip stage 2
3. 160 thermo
4. muffler delete
5. new alter
6. new batt
7. changed plugs and wires
8. all fluids changed
interior is in mint shape last owner redid the whole inter
as for exter rims are in mint shape look brand new and they have brand new tires
its going in monday for paint
the car i some what fast any pointer on what eles i can do to the motor to get some more power
thank guys
here is some work iv done
1. vortex intake
2. hypertech chip stage 2
3. 160 thermo
4. muffler delete
5. new alter
6. new batt
7. changed plugs and wires
8. all fluids changed
interior is in mint shape last owner redid the whole inter
as for exter rims are in mint shape look brand new and they have brand new tires
its going in monday for paint
the car i some what fast any pointer on what eles i can do to the motor to get some more power
thank guys
Le Mans Master
Joined: Mar 2004
Posts: 5,107
Likes: 171
From: Dublin CA
Your chip is not a good choice. You will get better performance from the stock GM chip.
High flow cat if you still have the cat. Anything to improve exhaust: headers, larger exhaust tube. Stock is 2-1/4 move up to 2-1/2".
1985 iron heads suck. Go for aftermarket aluminum heads......AFR or other good heads ($$$'s). Better intake, runners and plenum.
If you don't have the $'s for heads, then add 1.5 & 1.6 roller rockers...will add 5-10 HP.
Good tune up is always good. You can move up timing to 8-10 degrees, stock TPS setting is .54 volts....move this to .60.
Don't forget that you have a inline fuel filter (passanger side next to front wheel tucked into railing). I change mine every 10,000 miles or so.
Check out VADER86's web site, very good reading on improvements for the L98.
High flow cat if you still have the cat. Anything to improve exhaust: headers, larger exhaust tube. Stock is 2-1/4 move up to 2-1/2".
1985 iron heads suck. Go for aftermarket aluminum heads......AFR or other good heads ($$$'s). Better intake, runners and plenum.
If you don't have the $'s for heads, then add 1.5 & 1.6 roller rockers...will add 5-10 HP.
Good tune up is always good. You can move up timing to 8-10 degrees, stock TPS setting is .54 volts....move this to .60.
Don't forget that you have a inline fuel filter (passanger side next to front wheel tucked into railing). I change mine every 10,000 miles or so.
Check out VADER86's web site, very good reading on improvements for the L98.
Team Owner
Joined: Sep 2001
Posts: 62,141
Likes: 1,729
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
I'd say to get that chip out, but given that you've got a 160 and that hypercrap should have the lower fan settings, leave it for now.
But if you think its doing something for you other than keeping the engine cool....
Read through my site for the cheap upgrades, and then make some decisions for more major modifications. Set goals and a budget.
But if you think its doing something for you other than keeping the engine cool....
Read through my site for the cheap upgrades, and then make some decisions for more major modifications. Set goals and a budget.
Melting Slicks
Joined: Apr 2007
Posts: 2,616
Likes: 111
vader has a good web-site as he posted here.....I recommend looking at it.....I went through TPIS on my performance upgrades; they seem to know a little about the L98 applications and have parts others do not......the intake/heads on these cars are pretty weak by today's standards IMHO and if you have the budget and big performance improvements in mind you really need to focus there..
