what should the car run?????

["healthy"87]

87 gn 30 over 11-1 comp fully ported polished iron heads with stock intake port matched stock tb spacer 55lbs inj fast program 2 bosch pumps pulleys 3 in downpipe and exh 390 gears trans brake 63e turbo stock intercooler 90-10s/50/50s moroso trick rear springs s side bars pinion snubber s-10 cyl 10.5 slicks 16-18 lbs of boost please lemme know what you guys r running

 

[Sleeper-6]

Say What !?!?!?

Ummm' just to start out, Where are you getting the specs for this combo? It sounds like a recipe for disaster. 11-1 comp is not going to work in a turbocharged engine. It will run, but add boost and you'll prob drive over your crank shortly after. The 3.90 gears aren't the hot ticket either. These engines are not high RPM screamers like you typical import or small block. for the most part they are done by 5500 or less. Any more than that and you're just shooting yourself in the foot.

 

[BUICKTR]

11-1 compression

Who Build that Motor. Maybe you need to remove the turbo and just put a big shot of NOS. How did they get the compression on your car?? Dome Pistons or milled the heads how many thousands? The most compression to run in a street/strip turbo Buick would be 9-1. I personally like 8-1 or 8.5 -1.

 

[JToups386]

Ditto!!! 11:1 compression w/ 18-20psi boost = KABOOM!!! I expect we'll see the fragments shooting across the skies of North America, kinda like miniature Haley's comets...
Sorry, I don't intend to sound mean, but, surely there's a mis-calc or mis-print on that number???
I too agree that it needs to be 8:1 or 8.5:1. My last motor was 8.64:1, but that was only per milling and decking.
Anyway, please look into those numbers, and let us know if that was a true figure. With all the other stuff you listed, it sounds like it would scream like a banshee, with a normal compression ratio...!

 

[Brian Mc]

All of the success of TR's has been with stock 8-8.5 compression and mostly with stock bottom ends and 3.42 rearends. start over with a STOCK combination since this one is so far out of whack that no one on this board has even thought of trying it. Build Chevy small blocks if you want 11:1 compression. TR's are running 10's without going into the engine.

 

[turbodave231]

Nothing wrong with 3.90 gears and the right sized rear tires. I run 3.90's and 29x9s look at my signature. Just a bit high on compression for my tastes.

DR

 

["healthy"87]

conleys built the motor and they run the same combo in their cars with 18-20 lbs as far as the 390s go that was my choice and they seem to work fine i did run 73s but these just fell in my lap and the others were trashed- the cam is their race spec 2 cam-469/469 dur 276/276w/112 lobe seperation

 

[buickfreak]

I hope this 11 to 1 compression is a joke or an error because this is not going to work. Other than that, the setup looks fine But change those pistons and fast before going to the track and pushing 25psi boost

 

[JToups386]

Originally posted by "healthy"87
conleys built the motor and they run the same combo in their cars with 18-20 lbs as far as the 390s go that was my choice and they seem to work fine i did run 73s but these just fell in my lap and the others were trashed- the cam is their race spec 2 cam-469/469 dur 276/276w/112 lobe seperation

Interesting...
I've known and raced with Lawrence and Janace Conley for 10+ years, and am fairly familiar with their work, and I'm certainly not familiar with an 11:1 motor being on their menu. They actually build their typical street/strip motors to 9:1, which I still think is a little high, but it's something Lawrence started doing a few years ago and has made it work. If he's now found a way to run 20psi on an 11:1 motor, I'd love to see it, because he will have done something no-one else in the Buick family has been able to accomplish successfully, to my knowledge... I'd love to hear if anyone else out there has pulled this off, and what laws of physics they've figured out to how to defy.

No offense "Healthy87", but this just sounds totally out of whack to me, and obviously others here too. I might call Conley's this coming week, or maybe even stop by their shop to see what they've got going these days, if they've pulled this one off...???

 

["healthy"87]

i know chris's motor is 10.5 -1 and he can get 19 out of it mine is the same (a little higher) and rick baiteys motor is 10-1 also -black has had that high comp. motor in it for sometime i belive i am not wrong or saying anything untrue here i do know of other guys running high comp also(not 10.5-1) and having good luck! i am just trying to get opinions from others who know these motors and it looks like i gotum!!!!!!!

 

[JToups386]

Well, that sounds great then... However, it appears that everyone replying thus far is equally shocked at the compression ratio. I have not seen Chris' car run in several years, so maybe that's what he's got in it now. I'm not inplying that you are lying,,, but rather,,, just going with the learnings of all of us who have been racing these things for years and years. I don't claim to be an expert by any means, therefore, I cannot dispute them making this work, and maybe they've found new ways to do so. To me,,, it just doesn't sound sensible, and would appear to be a ticking bomb waiting to explode at the slightest miscalculation causing detonation. I also tend to lean more on the conservative side, as opposed to running on the very edge. This too comes from experience of blowing these things up many times, before learning what worked safely.
Also, Since the early 90's, Conley has given ET estimates for every package they sell, so it would stand to reason that you should get them to predict what you'll run, since they seem to be the only ones running this combo of compression vs. boost.