C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old Jun 24, 2012 | 10:34 AM
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Default supercharger?

had anyone here put a supercharger on a 86 vette? if so it is worth it? what kind? were does one find a low profile 671 sytle kit? or am i better to go with a procharger?
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Old Jun 24, 2012 | 08:07 PM
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Originally Posted by kandyman
had anyone here put a supercharger on a 86 vette? if so it is worth it? what kind? were does one find a low profile 671 sytle kit? or am i better to go with a procharger?
How many miles is on the engine you want to supercharge, might just be cheaper to overhaul and stroke ect.
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Old Jun 25, 2012 | 07:16 AM
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I have a built Powerdyne on my 86. It has 100,000 miles on it but is in very good condition. I have the stock bottom end. I am running a miniram and a few other minor changes. I am running 6 lbs with a FMU and timing retard. I wouldn't run any more then that if you like to be safe. I think it runs very well.
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Old Jun 26, 2012 | 11:23 AM
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Default What is an FMU?

Painterman- what is an FMU? I see a Procharger setup online for $5500 that comes with an intercooler, some D1 Pro Charger, all the accessories, belt, brackets, everything and they ask for if you need and FMU or you are using your own fuel pump and if you want larger injectors.

I have an 86 as well, just hit 40K miles- SuperRam, Headers, Low Temp Fan Switch and thermo stat. I was just getting ready to get a build on for a 383, and i saw this part of the forum. By the time I am done it will be near 9300 for the 383 installed, mostly from Summit, but all Forged and Hi-end stuff. Yet, I will only be at 450HP, which is what the Procharger said I can get for $5500, and now throw away all the life left on this engine. Any advice?
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Old Jun 26, 2012 | 04:24 PM
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Originally Posted by 86GreenwoodVette
Painterman- what is an FMU? I see a Procharger setup online for $5500 that comes with an intercooler, some D1 Pro Charger, all the accessories, belt, brackets, everything and they ask for if you need and FMU or you are using your own fuel pump and if you want larger injectors.

I have an 86 as well, just hit 40K miles- SuperRam, Headers, Low Temp Fan Switch and thermo stat. I was just getting ready to get a build on for a 383, and i saw this part of the forum. By the time I am done it will be near 9300 for the 383 installed, mostly from Summit, but all Forged and Hi-end stuff. Yet, I will only be at 450HP, which is what the Procharger said I can get for $5500, and now throw away all the life left on this engine. Any advice?
a FMU is a Fuel Management Unit. It increases the fuel pressure as the boost rises. The one I am using is a vortec unit. It is an 8 to 1. For every pound of boost it increases the fuel pressure by 8 lbs. It is not as good of a system as larger fuel injectors and a new tune but with only 6lbs it works well.

With a 40K motor you should have plenty of life left in your engine. I don't know if I would want to push my stock bottom end to 450HP with a blower. It's going to take a few lbs to reach 450HP
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Old Jun 26, 2012 | 04:32 PM
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Default FMU and Tranny

Painterman, thank you for the info- I am doing new injectors just because of the age and the wear on the O-rings and fuel pump. I was planning on getting the Walpro unit that goes 190lbs, and new 30# injectors. I was also getting scorpion roller rockers that some guys on CF suggested and helped me pick out. Do you agree with these? it all comes down to about 600.00 for the upgrades, so it seems worth it.

Do you have a part # or a link to this FMU? is it a device? how does it plug into the fuel system? I am looking at an adjustable Mass Airflow sensor that is supposed to tell the computer to add more advance on the timing and dump more fuel, so will that help? I would prefer not to get into a tune and open that can of worms if the FMU and MAS will work.

I am thinking my stock BE is ok to 425-450 till I get to around 80K in miles? than I should be able to double back for a forged bottom end and AFR. My question is I am told the 4+3 tranny is only good till about 425-450HP and that is what is really holding me up is I love that tranny- what do you think?
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Old Jun 26, 2012 | 05:01 PM
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Originally Posted by 86GreenwoodVette
Painterman, thank you for the info- I am doing new injectors just because of the age and the wear on the O-rings and fuel pump. I was planning on getting the Walpro unit that goes 190lbs, and new 30# injectors. I was also getting scorpion roller rockers that some guys on CF suggested and helped me pick out. Do you agree with these? it all comes down to about 600.00 for the upgrades, so it seems worth it.

Do you have a part # or a link to this FMU? is it a device? how does it plug into the fuel system? I am looking at an adjustable Mass Airflow sensor that is supposed to tell the computer to add more advance on the timing and dump more fuel, so will that help? I would prefer not to get into a tune and open that can of worms if the FMU and MAS will work.

I am thinking my stock BE is ok to 425-450 till I get to around 80K in miles? than I should be able to double back for a forged bottom end and AFR. My question is I am told the 4+3 tranny is only good till about 425-450HP and that is what is really holding me up is I love that tranny- what do you think?
I don't think you will need a new MAF sensor. When you build boost you need to pull timing not increase it. I am using a MSD digital 6AL and a MSD timing retard unit. It pulls the timing as boost increases. You can buy one MSD unit that does both jobs. I am running 26 lb injectors. I would think 30lb would be a little big for the stock tune.

I have no experience with the 4 + 3 transmission.

the FMU Goes into your fuel line. A vacuum/boost line operates it.

Last edited by PAINTER MAN; Jun 26, 2012 at 05:06 PM. Reason: adding info
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Old Jun 26, 2012 | 11:08 PM
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Originally Posted by 86GreenwoodVette
Painterman- what is an FMU? I see a Procharger setup online for $5500 that comes with an intercooler, some D1 Pro Charger, all the accessories, belt, brackets, everything and they ask for if you need and FMU or you are using your own fuel pump and if you want larger injectors.

I have an 86 as well, just hit 40K miles- SuperRam, Headers, Low Temp Fan Switch and thermo stat. I was just getting ready to get a build on for a 383, and i saw this part of the forum. By the time I am done it will be near 9300 for the 383 installed, mostly from Summit, but all Forged and Hi-end stuff. Yet, I will only be at 450HP, which is what the Procharger said I can get for $5500, and now throw away all the life left on this engine. Any advice?
Do you already have headers and exhaust? You could drop another $2k real easy...

Did you ever think about a rear mount turbo? If so, you should take a look at mine. I'm in Vegas as well...

Cheers,
Ron



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Old Jun 27, 2012 | 04:26 AM
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HI, yes, already have headers and exaust done. The turbo option like you have is amazing but it is so much work compared to bolting on a super charger and I think the SC has the ability for more power? I could be wrong, but that is what procharger said. I also get a little freaked out about all the heat that close to the gas tank and the heat traveling along the car by fuel and or brake lines. I am sure they have the system worked out correclty, but i am an old school- all your crap under the hood kind of guy.
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Old Jun 27, 2012 | 10:10 AM
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Originally Posted by 86GreenwoodVette
HI, yes, already have headers and exaust done. The turbo option like you have is amazing but it is so much work compared to bolting on a super charger and I think the SC has the ability for more power? I could be wrong, but that is what procharger said. I also get a little freaked out about all the heat that close to the gas tank and the heat traveling along the car by fuel and or brake lines. I am sure they have the system worked out correclty, but i am an old school- all your crap under the hood kind of guy.
RM Turbo Chargers take about eight hours to install. My car puts down over 600 rwhp at 13 psi with the base system w/o intercooler. I don't think the base Procharger will come close. As you probably already know, the PC takes crank HP and the Turbo takes heat and velocity from the spent gasses. It's much more efficient. Fuel tank, fuel and brake lines are not an issue. The hot gasses and system parts are contained where the stock exhaust system already resides. I'm as old school as they come and I love this system. And the nicest part is that it's cheaper as well... The only drawback is you loose your spare tire compartment. When I travel I just through the spare in the cargo compartment...

Cheers,
Ron
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Old Jun 27, 2012 | 04:29 PM
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My bad, i thought i read the single turbo only took the C4 to 400-420HP? well tell me more about this- where do you get it installed in LV? **** on the spare tire-I will put run flats on there. I want to get a fast 60K miles out of my 40K mile motor before i have to do any upgrades to it like 383 style- so give me the info on getting that done please !
Pm me- I will email you back my personal.
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Old Jun 27, 2012 | 09:47 PM
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PM sent...
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Old Jun 27, 2012 | 10:29 PM
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Originally Posted by 86GreenwoodVette
Painterman, thank you for the info- I am doing new injectors just because of the age and the wear on the O-rings and fuel pump. I was planning on getting the Walpro unit that goes 190lbs, and new 30# injectors. I was also getting scorpion roller rockers that some guys on CF suggested and helped me pick out. Do you agree with these? it all comes down to about 600.00 for the upgrades, so it seems worth it.

Do you have a part # or a link to this FMU? is it a device? how does it plug into the fuel system? I am looking at an adjustable Mass Airflow sensor that is supposed to tell the computer to add more advance on the timing and dump more fuel, so will that help? I would prefer not to get into a tune and open that can of worms if the FMU and MAS will work.

I am thinking my stock BE is ok to 425-450 till I get to around 80K in miles? than I should be able to double back for a forged bottom end and AFR. My question is I am told the 4+3 tranny is only good till about 425-450HP and that is what is really holding me up is I love that tranny- what do you think?

IF YOU ARE SUPERCHARGING GO WITH SIEMENS 60LB INJECTORS AND HAVE THE PCM RE CALIBRATED FOR THE INJECTORS
i THINK YOU KNOW WARE TO SEND THE PCM
THE CAR FEELS MORE POWERFUL BEFORE THE SUPERCHARGER INSTALL. ( TIRE SHREDDING)
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Old Jun 27, 2012 | 11:03 PM
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Originally Posted by 86GreenwoodVette
Painterman- what is an FMU? I see a Procharger setup online for $5500 that comes with an intercooler, some D1 Pro Charger, all the accessories, belt, brackets, everything and they ask for if you need and FMU or you are using your own fuel pump and if you want larger injectors.

I have an 86 as well, just hit 40K miles- SuperRam, Headers, Low Temp Fan Switch and thermo stat. I was just getting ready to get a build on for a 383, and i saw this part of the forum. By the time I am done it will be near 9300 for the 383 installed, mostly from Summit, but all Forged and Hi-end stuff. Yet, I will only be at 450HP, which is what the Procharger said I can get for $5500, and now throw away all the life left on this engine. Any advice?
Hey There What Part of Town Are U In?
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Old Jun 28, 2012 | 12:54 PM
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I am in Las Vegas- the hottest place in the world to try and run your modified C4!
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Old Jun 28, 2012 | 01:39 PM
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I would like any info on this turbo system also. I'm running an LT-4 and could use a boost as well. Any help would be greatly appreciated.
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