*The ulitmate street/strip build* F1C procharged trans am ws6 ~pic heavy~
06-11-2017, 08:09 PM
#121
Well I know the Alchemist has the same pulley combo on his 416 and he is at i think 16 psi or so with an F1A Mine is only a 376 with bigger procharger. I would think it would be atlas 16 psi. Ill have to look over the last log tomorrow, but I didn't build into boost until fairly high rpm I remember right.
The tranny temps seem to stay pretty cool. 140-180 degrees. I
As far as alignment I believe they are aligned but I didn't have problems getting to that point, I am running the belt that brute speed sells. I have ready everywhere that the Dayco green stripe is the belt to be running. I may grab one of those and try it.
The tranny temps seem to stay pretty cool. 140-180 degrees. I
As far as alignment I believe they are aligned but I didn't have problems getting to that point, I am running the belt that brute speed sells. I have ready everywhere that the Dayco green stripe is the belt to be running. I may grab one of those and try it.
If the temps aren't bad do u feel slipping?
Green stripe is best, currently what I run. Given that your motor is smaller it should build boost faster and make more of it as ur consuming less air and the bblower specs are the same.
06-11-2017, 11:24 PM
#124
Yeah, I have a 7.65/4.00 pulley combo with my F1A, on my 416, and made ~16psi, but it tapered off up top due to some belt slip that I had, plus trying to suck through a clogged air filter.
I don't see why you're not in the mid to upper teens for boost.
I hate to say this, but make sure that the blower rotation is correct. It wouldn't be the first time that it was a standard rotation blower when it needed to be a reverse rotation.
I don't see why you're not in the mid to upper teens for boost.
I hate to say this, but make sure that the blower rotation is correct. It wouldn't be the first time that it was a standard rotation blower when it needed to be a reverse rotation.
06-13-2017, 06:05 AM
#127
Even if it's spun backwards, it will still move air in the same direction, just far less efficiently.
06-13-2017, 06:54 AM
#128
So with a 7.65/4.0 pulley setup, you only make 6-7psi? What cubes? On my 346, I ran a D1 with that pulley combo, and it made a solid 14-15psi of boost... part of the reason I lost a ring lang.
Even if it's spun backwards, it will still move air in the same direction, just far less efficiently.
Even if it's spun backwards, it will still move air in the same direction, just far less efficiently.
Yes my setup only makes 6-7psi, stock 346, but it does have a fairly healthy cam (Futral F13) and 1 7/8 headers. Based on most searching I did, that was about what I expected based on others comments and posts.
06-13-2017, 03:07 PM
#129
You should be making around 18 psi with that big blower. I bet your boost is going out the blow off valve. Once the vacuum line to my Big Red was left disconnected after a dyno session. It made about 14 psi on the dyno, but only 7 on the street. Same thing happens if you tee the vacuum off the vacuum reservoir with the check valve to it. That **** happened to me too!
I have a thread on here about pressure testing the intercooler and plumbing. Might be a good thing to do for peace of mind.
06-14-2017, 11:34 AM
#131
Toward the bottom of the thread there's some pics of my intake pressure test tools. Using a pressure regulator, gauge, and shutoff valve to slowly bring up the air pressure. This also has been useful for filling up bicycle tires to a certain psi.
https://ls1tech.com/forums/forced-in...s-cracked.html
https://ls1tech.com/forums/forced-in...s-cracked.html
06-14-2017, 11:05 PM
#132
Well i have went back over all of my clamps and changed my belt to a gator back that came with my procharger, Still about 9 psi...slowly climbs to this as well. I need to do an official leak test to be certain this is all I'm going to see. Tuning isn't finished yet, i'm seeing 9s AFR right now at WOT...but for it being that rich is sure pulls like crazy! I am very happy with the way it runs as it sits. Once I get it leaned out I doubt ill need anymore boost....until I get use to it anyway 
There is a dyne in town on saturday ill strap it down too. Ill let you guys know what it does.
There is a dyne in town on saturday ill strap it down too. Ill let you guys know what it does.
06-18-2017, 11:02 AM
#133
Little updated, Been working with Pat G getting this thing in the ball park on the tune. We struggled for a few days getting the IAC counts correct. Finally figured out he IAC valve was the incorrect one! Stuck the right one in and it worked fine. I stuck a new gator back belt on the pro charged and its still only making 9.2 psi of boost. We have the tune fairly close now its reading about 10.90-11.30 WOT 24 degrees of timing at 9 psi of boost. There was a local mobile dyne in town this weekend so I threw it on there. With low boost and tune not being spot on yet I was expecting 650 or so......was surprised to see it make 809hp 699 torque! Very impressed considering the lower boost number, Im thinking this setup must just be really efficient! I am battling some issues with the 4l80e transmission going into gear really hard killing the engine if I don't give it a little throttle. Hoping to get that figured out soon, and dial in the tune. Overall very happy with the setup so far. Here is a video of it on the dyno! Just for comparison my body thought his twin turbo 408 on there which usually puts down 1100 hp or so. It made 1226 torque and 1037 hp with about 23 psi of boost.
06-19-2017, 12:06 PM
#140
So the reverse rotation question has been answered, where's the leak?
Other ways boost can get lost:
* Undersized injector o-rings on intake manifold side
* Torn intake manifold gaskets
* Intake manifold not sealing flush to heads (due to milled heads)
* Bad internal intake manifold seals or cracked somewhere
* Cracks in intercooler
* PCV vent in throttle body (mine is capped off)
* Big Red BOV not holding
If the boost issue is fixed this car could be pushing 1k rwhp!!