cam timing experts come inside
it has a KB racing hotside, and a 4 inch exhaust about 8 inches long
ive tried running 22lbs and 22deg of timing and it still makes **** power
i also have a converter im going to swap out next just getting tired of shotgunning parts.
its the 3rd turbo, 2nd hotside, 3rd camshaft swap, so i think its time to start digging into the motor, 140psi compression with 317 heads
ive tried running 22lbs and 22deg of timing and it still makes **** power
i also have a converter im going to swap out next just getting tired of shotgunning parts.
its the 3rd turbo, 2nd hotside, 3rd camshaft swap, so i think its time to start digging into the motor, 140psi compression with 317 heads
i cant even brake stand a burnout in first gear, and when i take 20 minutes to do that, it bogs in 2nd gear lol, feels like trash, ls1 cam 4.8 with a 7665 will torch high gear for as long as you are crazy enough to stay in it.
On The Tree
Joined: Aug 2013
Posts: 132
Likes: 0
This sounds exactly like what my car is doing, leaving on 7psi it moves like a herd of turtles and will only 1.9 60'
140 is really low.... I'd suggest one of those Hex-a-just timing sets with the adjustable allen key on the cam gear. That way your not killing yourself pressing on and pulling gears all day. You can also do a quick compression test without reassembling the motor completely to see where your at.
http://www.briantooleyracing.com/com...chain-set.html
http://www.briantooleyracing.com/com...chain-set.html
9 Second Truck Club
iTrader: (17)
Joined: Sep 2006
Posts: 3,672
Likes: 9
From: Colorado Springs, Co/ Central, Ca
A 10:1 L33 with the 218 cam should crank around 170-180 psi with fuel pump dissabled and throttle open all the way. 14 deg is low but at 15 psi and 14 deg car should be somewhat fast. Also just because you command x timing doesn't mean that is what you have. I have seen command vs actual off over 6 deg. My truck with 212 cam in on 113 Intake centerline cranks 175-180 in my worn out lq4. Nova with the 218 cam in on 110.5 cranks 170-175.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Changing Names
Joined: Feb 2013
Posts: 236
Likes: 1
i dont sweat compression as long as its very close to eachother as cheap gauges will vary compared to others.
had one motor stress me out with 100 across the board, grabbed another and it was 170
leak down showed it was 2%
Id do a leak down on all cylinders and that shows fine. id try another trans or make sure ebrakes or something isnt hanging up
had one motor stress me out with 100 across the board, grabbed another and it was 170
leak down showed it was 2%
Id do a leak down on all cylinders and that shows fine. id try another trans or make sure ebrakes or something isnt hanging up
this is a stock pcm? is it showing your actual timing or your command timing. no knock retard happening? knock sensor wires to close to plug wires?just thinking out loud here.
if the cam is retarded shouldn't you be able to see it in the cam sensor to crank sensor coralation. on older engines my snapon red brick will show timing vs desired timing
I wonder if a gm tech2 whould show it. ?
if the cam is retarded shouldn't you be able to see it in the cam sensor to crank sensor coralation. on older engines my snapon red brick will show timing vs desired timing
I wonder if a gm tech2 whould show it. ?
Damn, that is crazy. I bet you were happy after that! lol
I ran this same shortblock in my car (I bought it from Matt and then traded it to a friend who sold it back) and it consistently had 140-145 psi of cranking compression with a LJMS 235-237, 115+5 cam. It was never degreed. That engine, with PRC Stage 2.5 243s Cast S480 and an 80E in the Fairmont would go 9.3-9.2 all day at 18 psi. 145 mph as well at 3450 pounds. It made 852 wheel, unlocked at 17-18 psi and 14* timing. I regularly checked the compression and leakdown in that engine and it was just about the same every time.
I am very curious about this though. My current combo runs about the same times and mph with more cubes and TFS 220 heads. However, it will run those numbers on 4 psi less boost. Still, I have always wondered if the cam was off because both engines did not seem to backhalf as well as they should. Same cam in both.
Mike
I am very curious about this though. My current combo runs about the same times and mph with more cubes and TFS 220 heads. However, it will run those numbers on 4 psi less boost. Still, I have always wondered if the cam was off because both engines did not seem to backhalf as well as they should. Same cam in both.
Mike
9 Second Truck Club
iTrader: (17)
Joined: Sep 2006
Posts: 3,672
Likes: 9
From: Colorado Springs, Co/ Central, Ca
I ran this same shortblock in my car (I bought it from Matt and then traded it to a friend who sold it back) and it consistently had 140-145 psi of cranking compression with a LJMS 235-237, 115+5 cam. It was never degreed. That engine, with PRC Stage 2.5 243s Cast S480 and an 80E in the Fairmont would go 9.3-9.2 all day at 18 psi. 145 mph as well at 3450 pounds. It made 852 wheel, unlocked at 17-18 psi and 14* timing. I regularly checked the compression and leakdown in that engine and it was just about the same every time.
I am very curious about this though. My current combo runs about the same times and mph with more cubes and TFS 220 heads. However, it will run those numbers on 4 psi less boost. Still, I have always wondered if the cam was off because both engines did not seem to backhalf as well as they should. Same cam in both.
Mike
I am very curious about this though. My current combo runs about the same times and mph with more cubes and TFS 220 heads. However, it will run those numbers on 4 psi less boost. Still, I have always wondered if the cam was off because both engines did not seem to backhalf as well as they should. Same cam in both.
Mike
havent had time yet, still tuning and just got back from sema etc, maybe this weekend, maybe, haha im thinking about just pulling the motor, and putting in a 5.3 i have, and then seeing how it goes, and then take my time with this one if it gives me any more trouble
still have to try another ECU and some other things before i get nuts on others reccomendations
still have to try another ECU and some other things before i get nuts on others reccomendations