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

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Old Oct 22, 2009 | 03:37 PM
  #21  
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You can run low 13's in your car with some pretty minimal mods. I went 12.84 in my 91 with a really basic set up.
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Old Oct 22, 2009 | 04:15 PM
  #22  
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Originally Posted by solaris_vii
hey you used to post on tgo, right? i used to have an 85 iroc and 85 vette and now i just have the 85 vette lol funny we both went from camaro to vette. anywho, im currently re-redoing mine but what i did the first time around was slp runners magnaflow cat back and 52mm throttle body. those three things mademy 85 alot quicker according to my seat of the pants dyno, and arent too expensive. you can bore out your current throttle or even stick with the 48 (theres a huge debate on bigger throttle and if theyre a waste of money or not, pm me if you want my take on it) the slps are $300 ish or you could try and find a used set and they REALLY help and then the magnaflow cat back was about 500. so you could buy the slp runners now and get to porting and then buy a new exhaust when you get some money saved up and just keep doing mods to improve airflow thats the tpis major downfall
Don't waste money on a TB it will do you no good. The Runners and exhaust is a good idea but I would do headers as well.
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Old Oct 22, 2009 | 05:12 PM
  #23  
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13.0-13.3 is easy
I have a nitrous kit for sale. shoot a 75-125 shot and run those times and 12s
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Old Oct 22, 2009 | 09:22 PM
  #24  
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Well i got flowmasters with the cats gone. If i get some headers with a y-pipe made up i figured that would be good. Then i dont know? Theirs alot of ways i could go. Im thinking about the runners? Mabey a good used set? Then iv always heard dont waste money on a TB unless your going to be making big power? Or should i if i get runners?

neat "You can run low 13's in your car with some pretty minimal mods. I went 12.84 in my 91 with a really basic set up."

How?

then i dont want to use nos sorry even though its real easy i would just hate if something went bad! Its at 102,xxx miles.

kevin
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Old Oct 23, 2009 | 12:06 AM
  #25  
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these engines are actually very tough. local guy was spraying a 125 shot on a completely stock engine with NGK plugs and running 12.7 all day.
11X,XXX miles too
sold it for a viper tho. now he runs 10s
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Old Oct 23, 2009 | 07:10 AM
  #26  
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Thats good. But i would be with out a car for a long while if it blew. So im trying to do everything as safe as posible. I granny shift my so much! Then im avg 18.2 mpg and i do more city then anything.
kevin
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Old Oct 23, 2009 | 06:34 PM
  #27  
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If I was starting over, with a stock 86, I'd put a true dual exhaust on first and 1:6 roller rocker and a SLP air induction, with a retune. the duals will make it run a little leaner, without a tune. I would suggest a higher stall converter, but an 86 vette stalls @ 1900-2100 when flashed. But these are the least expensive things you can do that I know will work. SPEED costs it's just the way it is. I would save my money and do a little at a time. And that will give you time to think about what you want from the vette. Take time to enjoy it for a while.

Randy
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Old Oct 23, 2009 | 09:19 PM
  #28  
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I'm pretty sure a 3" single pipe is gonna be good up to 450 or somewhere around there, can't remember the number off the top of my head but either way, don't worry about duals yet. If you are going to do exhaust mods, headers are the best bang for the buck. Heddmen makes some cheap 1 5/8" primaries (good for 350-383cid combos) or if you can swing it Stainless Works (or old LPEs) have tuned length primaries for maximum power.
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Old Oct 23, 2009 | 10:15 PM
  #29  
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Originally Posted by 19Beast90
Hey guys for some of you that dont know i am a new corvette owner. I am 18 and bought it myself i am not a rich punk. Anyways It is a 86 with the alluminum heads. It has flowmasters with all 3 cats gone! It has a stock motor L98. Compared to my 305tbi camaro its fast! But now that iv had the car for about 2 months i found that it was not very fast. Not sure what to do?

was thinking....
cam swap?
intake swap?

I would just like to make some more power mabey to give a stock LS1 a run. I also have the i think the 3.23 rear with the Z51 suspension. I only have about 500 dollars right now but am saving. Just want to get an idea on what to do next.

thanks for your help
kevin
Kevin, I'm gonna give u some advice most here will not agree with. Viewing ur profile and ur original post, ur 18 and already own a Vette. This, in and of itself is something alot of older guys can only wish they had. U've already switched cars once, so I'd venture to say, this one is also not a 'keeper". Unless ur looking to keep this particular car for 10+ years, and really get the enjoyment out of the mods u are proposing, I'd keep it stock and in as good as repair,both mechanically and cosmetically as I could, based on funds available. Enjoy what u have and drive it like it's stolen!
I know this is going to sound like the pot calling the kettle black, considering the amount of mods I have done to my car, but, from experience, u are putting money into a bottomless pit with no hope of recovery. If ur fine w/ that, let the modding begin. If not, save ur money and in a year or two, move up to a stock Lt5, C5 or C6, or a car that's already been extensively modded and is going for a song. These cars are by no means cheap to get to the power level u are wanting. They are old, and performance parts are starting to dry up. The electronics are ancient by today's standards and finding a local tuner to dyno tune is gonna be a hassle, at best. A mail order is a stop gap at best and u never know what ur getting. Also, anyone telling u to put an intake on by itself is fooling u, won't do much good. It's the total package, not one piece. And that is where the money ride begins. intakes-$1000 +, cam swaps - at least $500, if u do it urself, heads- at least another $1000-1500, rear gears
- $500-$800 dollars - see where I'm going? And in the end, u still have a maybe $5000 car. Take it for what it's worth, from experience.

And one more thing, I'd venture to guess that over 50% of the posters here would get rid of their current rides and upgrade if they could get a decent return on their dollars spent. JMHO, Tom
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Old Oct 23, 2009 | 10:44 PM
  #30  
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Ya i know what you mean. I am wanting to keep it for around 3-5 years then get like a 03 Z06 or like a 95 viper. But my car is in good condition nothing is wrong and is in good shape. It is a manual for some that dont know. Like i said before i would mind putting some money in it and just have 13 sec car. Mabey some nice wheels to.

Then i LOVE ur CAR!!!!!!!!! I want that green wood body kit but i cant really find it. As far as our corvettes you have EXACTLY what i want! besides the color but oh well. But NICE RIDE!!

thanks
kevin
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Old Oct 23, 2009 | 10:50 PM
  #31  
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Z01#316 great advice. listen to him , because you said you already have plans to upgrade cars. believe me even at all the mods listed a Z06 will still probably walk your vette and a viper will too. If you drive one of those then yours you will be disappointed or sell yours.
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Old Oct 23, 2009 | 10:52 PM
  #32  
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Originally Posted by USAsOnlyWay
I'm pretty sure a 3" single pipe is gonna be good up to 450 or somewhere around there, can't remember the number off the top of my head but either way, don't worry about duals yet. If you are going to do exhaust mods, headers are the best bang for the buck. Heddmen makes some cheap 1 5/8" primaries (good for 350-383cid combos) or if you can swing it Stainless Works (or old LPEs) have tuned length primaries for maximum power.
I transfered the motor and trans from my Firebird that was wrecked to the Vette. Before that, I ran a few times down the strip and averaged the times. Disconnected the exhaust from before the "Y" and ran it with the exhaust in the car. Nothing significant. I am making 410 at the wheels.
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Old Oct 24, 2009 | 12:45 AM
  #33  
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friend of mine here is selling his 94 viper lol
34,000 want the number?
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Old Oct 24, 2009 | 01:53 AM
  #34  
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with what they are saying .. but again bang for the buck go with LT headers and you will be happy for the 3yrs you own the vette.
I am building a DD and will get a Z06 when its done
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Old Oct 24, 2009 | 11:05 AM
  #35  
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Ya im thinking about doing the headers and the 1.6r. Ya i wish i had the money for a viper right now lol. But once i get out of school and get a full time job i will be getting one of the two.
thanks
kevin
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Old Oct 25, 2009 | 07:01 PM
  #36  
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I've talked about it a ton on here before, so if you search for my name you should be able to find a pretty detailed write up on the combo that ran high 12's. The meat and potatoes was:

1.6 roller rockers
Long tube headers
No cats or emissions equipment
4.09 gears
Centerforce clutch
Dyno tune done by me

That took my 91 to 12.84 @ 106. That was with a shift into 5th before the end of the track because of the little lungs of the TPI and the 4.09 gear.

There was a couple other little things, magnaflow mufflers, air foil, and a couple other things. The biggest gain I got was from the dyno tune.

On a 100 shot the car went 11.99 @ 112. It would have went faster on the bottle if I had stuck with the combo a little longer.

Lemme search for a bit and I'll see if I can find the write up I did awhile ago.
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Old Nov 12, 2009 | 08:17 PM
  #37  
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Ok i have been thinking alot about how i will make more power. So any how you basically have to ditch the intake. Like i said im still in high school and dont have a ton of money yet. So i was thinking of going to a regular intake and carb. I know it will make me enough power for what i want to do. My only thing is i want to keep it reliable.

so a few questions

Is their anyone on here that has done this? (im sure someone has)

Then how much money do you think it would be to swap over? Do you think i will gain power in the top end?

Then i will swap cams and do the long tube headers. My goal will be around 300rwhp. What do you guys think?

thanks
kevin
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To Next mod???

Old Nov 15, 2009 | 11:32 PM
  #38  
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You are really stepping backwards doing the carb swap.

If you put a bottle on the car it'll go faster than it ever would with a carb swap, and still maintain the stock reliablility and driveability.

Lots of folks here are all doom and gloom telling you to save for repairs, but if you want to mod it and it is running correctly now, I think you should do it. Most of the old hotrod tricks work for your car; rockers, headers, etc...

The biggest single change you can make (besides a power adder like nitrous) is an intake swap. Unfortunately, it's expensive. A new mini-ram (which is what you should go with, regardless of the all the pontificating that takes place on the net) is about $1500. By the time you do the gaskets, fluids, silicone, etc... It will probably be $1700 or so. When I was in high school, $1700 for mods was impossible, so I would be forced to do little things that I could afford. If I were in high school, and on a limited budget, I would do this:

Hooker headers
Ditch the emissions gear
Build my own AIR pump eliminator pulley, or buy the kit from breathless performance
1.6 full roller rockers
Custom tune
Nitrous
Tires

You could do that in any order, but do the tune last so that it's up to date with all your mods. Like I said, the tune made the biggest difference on my car. I went from trapping 102-103 to trapping 106, and running 13.30's to pretty consistent 12.80's.

Don't carb it man, keep the reliability of the fuel injection, the driveability of the fuel injection, the newer technology, etc...
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Old Nov 16, 2009 | 06:10 PM
  #39  
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ok i guess i wont. Their is another intake that i have seen? It kinda squareish? I think lignefelter puts them on some engines? Is that intake any cheaper?
thanks
kevin
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Old Nov 16, 2009 | 10:41 PM
  #40  
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That's a super ram. It's not available anymore, but there are used ones out there. They are no cheaper. They are also three piece intakes prone to leaks, and make working on other parts of the car a pain.
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