11.3:1 cr.

i spoke with "1LSWON" on here and he has some kooks on his lowered car and seems to think i would be alright.

 

I finally got the whole story on this car. Nice setup, glad to here you are happy with your numbers now.

 

i have been doing some digging/etc and have some more thoughts to add.

1. im starting to question the camshaft. it has the exact same symptoms as this cam, meaning it "burps, pops, and sputters" down low. i've had 3 tuners look at it, and its not the tune like mentioned in that thread. i know its a big cam and it'll chop, but its not acting right in certain areas of the powerband. i have to think with similar issues with very similar cams, it just might be a design flaw.

2. Another issue is i think my heads weren't worked to give me the compression that it was supposed to have. this motor was designed around the 11.3:1 CR from the get go(hence the nitrous pistons). what makes me think this is, even after all was fixed, codes, tune, and the exhaust...its still at or sub 500rw. i went back and checked my paperwork, and it doesnt mention anything about working the 72cc heads to achieve 11.3:1. Someone locally and i have discussed all this and we seem to think my compression is around 9.6:1...which kind of explains 20-30 missing rwhp.

these heads and this cam have never been touched, the longblock came assembled, timing chain on, heads bolted down, and cam installed and degreed.

on an unrelated note, we also discovered that the moser 9" i ordered was mysteriously sent with 4.30's instead of the 4.10's i asked for. and moser pretty much doesnt care, im still dealing with that but needless to say they'll never get another penny from me with all the hassle im going through.

needless to say i have a huge dislike for these kind of customer service issues. what shall i do? TSP?

 

Mind posting all your specs again? I realize they are probably in here somewhere, but to be honest I dont wanna read back through.
Maybe a lil refresher?

 

Callies Dragonslayer crank
Diamond -10cc nitrous Pistons
PRC Stage 3 heads, 72cc chambers apparently
257/266, .622/.642, 113 lsa cam
unported Fast 90/90 combo
1-7/8th's stepped to 2" Kooks, through true dual bullets, dumped before the axle.(TSP Rumbler)

car is an m6, textralia clutch, and moser 9"

 

I just wanted to post alittle info for you. My car is lowered pretty good. I have kooks 1 7/8 now. cam is 250 255 640 640 113, ported fast 90, A4, 12-bolt and all with a nitrous tune and pulled numbers in sig. The 1 7/8 gain a nice amount of power. My heads flow alot better than yours, Greg Goods magic ET 245`s! I felt pretty good with the numbers I got for a A4 and all that I have. Get the kooks, ported intake and tune done! Good Luck! And For GOD SAKE SPRAY THE **** OUT OF IT!!!

Sorry I have a 408 also!

 

i have had Kooks for a while now. the tune has been done.

I'd rather worry about why it sputters, and why im missing hp without the fast porting, than to throw money at it, and it not resolve the issue. i planned to spray it, but i must say im losing my confidence in whats involved in my build, so im not sure if i will.

 

Piston deck height? Head gasket?

 

I run 2cc pistons and 67cc L92 heads with .040 Cometic gaskets to get 11.3/11.4:1 compression on a 4.005" bore. I agree that your compression is much lower than you originally thought.

BTW: Hello Ed

 

Hey Kevin. :

 

im not sure on the deck height, but im fairly certain the head gaskets used were .051 Cometics. i typed that list this mornig as i was walking out the door headed out of town, i can check the paperwork when i get back home tomorrow night.

whats funny is, when we came to the thought that the compression is probably low, i thought of your post here becuase i wondered why you asked earlier in the thread what the compression was.

 

if the heads are 72cc your scr is around 10:2 or so. with something like a 59 cc head you would bump it up to around 11:7 or so which would pick you up around 6 % more power i believe (4 % for 1 point gain in compression ) which would be 25 rw or so.as for the sputtering i don't have a clue .

 

slow trap- is the times in your sig with street tires? Not bad for a street car! I`m just curious what mine is going to do at the track with almost the same numbers. I have a set of ET drags to use! Thanks!

 

i cant find anything on the deck height, but the gaskets are indeed .051 Cometics.

 

slmdls1 how much is your car lowered and what suspension do you have?

i am worried about scrapeing and wanna get a set of kooks

 

Didnt read the whole thread, to many guesses in it. What were you expecting for power?
IT seems your not that far off from what you should have. Only thing I can say is make sure the springs are setup properly and are correct for the cam. And I dont just mean lift.
Also that 9" eats about 20hp.

 

If you have your number correct, you have 10.1-10.2:1 compression. Not going to make the power your looking for. It needs compression and some cylinder head.

 

If this is the order I am thinking it is, the motor has a Callies Dragonslayer crank, Compstar rods, and a Diamond -2cc pistons. The motor was also built with a set of .040" Cometics as well. With the pistons out of the hole .005", you would be at a 11.1:1 compression ratio. Also, the invoice shows a TX Giant, 248/254, .622"/.614", on a 113LSA, not the 257/266 camshaft. While the car isn't a dyno queen, it isn't making terrible power. I'm sure with some attention to detail on the setup it could be going low 500's pretty easily. The low RPM driveability problems CAN be tuned out. This is a big camshaft but isn't untunable by any stretch of the imagination! In a 6-speed car, it shouldn't be bad at all.

I wasn't aware of an issue on the rearend. The P.O. faxed to Moser says 4.10 Moser Pro-street gears. I can do some more checking into it if need be. However, I wouldn't expect them to want to warranty or replace them after 10-months. We are always willing to give it a shot if you would like us to.

Jon
Texas Speed & Performance

 

so you changed your headers out to 1 7/8? let me guess, you gained very little power and lost midrange tq?

with my 408 and ported LS1 heads, I only gained about 5rwhp going to 1 7/8th headers from 1 3/4's. all these guys talking about how great 7/8th headers are on these cube motors make me laugh. I was at 550rwhp at that point.

 

It's lowered about 2", DMS Springs.
im expecting in the 520-530rw range, SAE.
Jon, i appreciate the pm, and i just found my invoice after i replied. my invoice # is 15105. it shows the Dragonslayer crank, Diamond -10cc dish pistons, .051 Cometics, and the 257/266 .646"/.622" 113 lsa cam. Dont worry about the rear, i didn't order it through you guys, but did contact the vendor i did order it from only to get sent to Moser. after multiple calls and trying to speak with "Kip" the VP for 2-3 months, and no returned phone calls, i get the message that they just dont care.

i gained a good bit of power. comparing apples to apples and comparing the full exhaust #'s i picked up 25 or 30 rwhp. the 1-7/8 True Duals are right about where i was with 1-3/4" Grots and dual open cutouts.