a 1979 camaro, 427c.i. sbc, 220cc 2.05 1.6 64cc heads (ported/w intake),edelbrock single plane intake 2500-7000rpm, 9:1 comp. w/a 260/260 .600/.600 custom ground cam, all forged4340 w/splayed caps,hell fire rings, clevite H series, twin 76mm turbos, twin water cooled intercoolers, fuel cooler, and mallory ignition w/boost timing, a 850cfm demon blow thru carb, th400 1000hp rated w/trans brake, 2.73 gears w/a mini spool, and street legal slicks.....does any one have a rough idea what it will run in the 1/4 mile i was hoping for a 9 second tt ride.....

 

Why such a tall gear? That combination is goo for 1100 FWHP on pump fuel or more, other than the gear, that could be high 9s to mid 7s depending on the rest of the cars weight, suspension and gearing.

 

from who ive talked to and what ive seen most turbo cars w/a 3 speed are running any where from a 2.41-3.56 gear and orr89rocz on here runs 9.8 with a 2.73 gear and to be honest his car really impressed me to the point to build a turbo car...so thats why i have choosen a 2.73 gear

 

With the trap speeds that motor will produce in that car, you dont need alot of gear. 140+ mph will be 5500+ rpm with 26" tires. 2.73's actually work well for my combination.

For you 79cam, you probably will be turning abit more RPM than me so could get away with 3.08's or even 3.23's depending on tire size. Even with those gears you will easily be 9's especially if you use that trans brake.

You have abit more head, more cam, and more turbo than me. If your car is in the sub 3600lb range, then you will easily be low 9's on pump gas with the trans brake leaving on 7-10psi and running 14-15 total.

 

the man has spoken (orr89rocz) dang i should of talked to you first cuz i already bought the heavy duty axles the mini spool, bearings ect.. the whole rear end is done and i mean new everything from brakes to hoses to even the 2.73 gears...so far the rear end is done i have the turbos, block splayed notched bored, crank, intake, airfilters, and misc. engine parts by march the motor should be done or just about, but it wont be ready till about next year. the only firberglass is the hood. but my question to you orr... is how many miles do you think i will get on the motor until i will need to rebuild it.. of course it depends on how much im into the throttle but it will be mainly a street car maybe race it at the track a few times? also i havent made the cam yet but what do you think or if you can think of a better cam let me know or anything you may hav an opinion on thanks orr..

 

i think i could go low 8's or high 7's with that engine/turbo combo @3100lbs.

 

what do you run diggler, and you think u can pull low 8s with my motor combo... so what would you change on my set up?

 

also i think im putting the car together pretty fast
it was just a nice camaro with a 383 about 400hp the fastest it went was a 13.2 so it was a very mild motor
it wasnt until halloween night when i sat down and finally decided what i was gonna do with the car...
supercharged or a NOS motor or just a built motor never did i even look into turbos till i saw orr89rocz youtube video well the rest is history and now since halloween ive been putting it together, so it is a for sure thing.
however im very new to the turbo game so im still learning and VERY OPEN to opinions and any ideas to improve my motor -like always thanks for the tips-

 

you can make quite a bit more than 1000 rwhp with a pair of 76's.
personally, i think its overkill for the car. i would spend more money on the rest of the car first, such as the cage, rearend, trans, and suspension. a single 80mm turbo could still get you into the 8's with a decent car.

my car makes somewhere around 625rwhp and runs bottom 9's on 275 drag radials.

 

Ok, most of my buddies run a 3.23-3.42 with boosted rides, i will be running 3.42 probably.

 

yeah 76s are abit overkill...definately enough turbo to get into the mid low 8's at most thirdgen street weights...

I just moved to 70mm twins and hope to be abit more efficient than the 60's I had and they will give me the range to go well into the 8 second range if I ever desire.
I seen a guy on turboforums run mid 8's at 160+ with twin 70's on a 406....so I know they are capable of doing so. He runs AFR 235's and a bigger solid roller tho. Now has 76's and is running mid 8's still but at few more mph..its making a good deal more hp

How long it will last? depends on how you drive it and how good the tune is and how well it was put together. Track it every now and then but change oil often, and I mean after every race day...it should live a long time. Turbo components and solid roller lifters may need servicing after few thousand miles tho.

For that setup with 76's I think you will need to have a solid roller to get the rpms up in the mid 6000 range to get use out of the heads/turbos. Thats where it will operate best and thus should produce incredible power on even lower boost levels. 9's on low boost easily. 8's when you turn it up some. Cam i'd get a custom grind to match your heads and desired rpm range. Choose any of the big named cam grinders like Cammotion, bullet cams, mike jones, Harold Brookshire from ultradyne, etc.... any of those guys can get you a nice grind. Alittle lazier lobe for better valvetrain life would be desired.

 

There are guys who have been solid 8's on a single 76mm, but at 3200+lbs you'd need more steam to get there.

As always, gearing is largely dependent on tire size and rpm. Turbo's like load to spool, and thus the steep gears work for them and also tend to create the big MPH numbers. However, especially on a smaller tire, the taller rear gear can be difficult to launch as it will increase your wheel speed everywhere, not just up top.



With that much CI and twin 76's I'd expect it to run into the 8's, even at full street weight/trim.