So i lock my timing at 38 deg and drive down the road. Boom. Forgot to hookup the Btm. First time to ever run btw.

Change Head Gaskets. Lock it out at 40 deg w/ btm knob on 2 1/2. Boom again

Now i have no Btm and timing Locked at 22 deg. I'm kinda worried about driving it again. Need some tuning help asap. Going to dyno tomorrow.

Anyone.

351w
F-cam
S-400
CSU 750
13202 reg w/ prostar 500 & 10 feed/return

 

locking it at 22* in the first place woulda been more appropriate IMO and to add, those BTM's junks suck. A guy on here just found out that he may have hurt his motor due to the diaphram mechanism not working so I wouldn't trust that thing anyways. Just lock the timing like you did at 22* and leave it...........for now.

What jets? Not enuff will hurt things too ya know?

BTW, that head gaskets that you use, aren't the absolute best out there to use. I did make some great power with them but I too prematurely blew gaskets and all was in good check with my jetting, timing and such. Changed to Fel-Pro multi-layers and have never blwon another. That gasket is a 8548PT-2 that you blew BTW.

 

Check your rotor phasing under vac and boost, I killed gaskets due to this, alignment is not real important under cruise but under boost it better be dead on....
Start your boosted timing at 15-16 and work up

 

Got a wideband O2 on it?? You need to know waht your AFR is or you might hurt it again. Cheap insurance.

 

Turns out that my dizzy didn't have the weights/spings removed so my timing wasn't locked out. I wasn't even aware that this had to be done. b Had this prob fixed today.

New to carbs & turbo's

Now have my timing locked out at 24 deg w/ no BTM hooked up. My wideband at idle is 12.5-13.1

I'm using a 9333 pt-1 gasket torqued to 110/100 with \

Ngk "9" plugs gapped @ 28.

Their is really no way to "tune " it without going WOT is their?

I do NOT want to change the head Gaskets again.

 

The fel-pro 9333PT-1 and 8548PT-2 are esentially the same gaskets. They work great if you keep boost in the 12-15 range........anymore than that, look out.

You can get a decent baseline on the t-brake. I've done that a few times to get base jetting down.

AGAIN, what jets you got in it as is?

 

Not sure. Need to check. I got the Csu carb off a friend who's build didn't go through. His was going to be a 347 at 16lbs. I bought it cause my setup was kinda close to his. Plus I got it cheaper.

This carb was untouched when iI bought it. Don't have a brake as of right now. PA C-4 rev man.

I do agree about the gaskets though. If i would have put the MLS gaskets in before, it would have gotten really bad. Once i get the low boost tune out of the way, i will upgrade for more.

 

I run 25* locked out, Same gaskets, 12psi on pump gas. Jetting is 75/80 AFR = 11.2


Jeremy

 

Those headgaskets should hold up to a lot of boost if the tune is fine. I have pegged a 3 bar map sensor with the 8548pt2 with an iron head and small head studs.

You should be able to drive around and put a load on the motor and read AF at different boost levels. I can cruise around and ease into the throttle and see 1-10#'s and watch what the Af does. Do this a few times at different loads and boost levels to get an idea what is going on. Have a buddy jump in and tell him anything over xx.xxAF is bad and to let you know.

If you can get the carb apart see what jets are in it and post up... or call Dave!

 

Be conservative on the tune and use good fuel (something with lead!) to start with. Are the deck surfaces on the heads and the block flat?
My tune was 7-9psi on 93oct with 28* locked. Mixed in 110 when the boost was up and left the timing the same. I was running ROL graphite ht gaskets.

 

I'm meeting Turbostang at the track tomorrow and we are gonna try to get the tune inline. I just cant make myself take it down the street. Lol. The last two times i got on it the head gaskets blew.

He has a few Blow thru's under his belt. Will let you guys know what happens. BOOM!

J/K.

 

I'll bet you $1000 that you have waaaaaaaayyyy too little jet in the carb. I'd say about 68/78's or so which is far too little IMO. If that jetting is the case, go with at least 75/85 range and start tuning from there. I safely made 845 RWHP with 27 psi of boost and 75/85 jets with a CSU750 carb without any of my modifications to it and also with Fel-Pro 8548PT-2 gaskets.

 

Scott ill will be at the track tonight with my car, Ill have all my jets and carb stuff If you need any.

 

right now my setup has 75/87 jets and it did okay at the last track outing with about 8-10 psi.

 

So I am somewhat close! Did you have a AFR reading with that 75/87 jetting?

 

How did it do last night?? I didn't see because I was helping my friend next to where you parked. Your car looks sweet good job on the build. I hope I see it in the daylight and see all that shine

 

Got car to track today. went a 6.6x @ 110 in the 1/8th. 9lbs boost/ no brake/ no tune. 24 deg locked timing.

Its running really,really rich at wot.

That was shifting at 5k and blowing thru the converter really bad. Powerglide swap on it's way

After glide w/ brake goes in, i will be turning up the boost. Stay tuned.

 

Once you get that tuned it should run strong. If you don't mind me asking when does it start to spool and how is it on the street. I am looking to switch my 5.0 twins to 5.8 s-400 with probably same cam as yours.And what size wastegate do you run? thanks

 

brent, i haven't checked the a/f closely but just from looking at the graph it was 12-13 under boost

 

I'm running an Ebay 60mm wastegate. Seems to be doing fine. Haven't ran it on the street as of yet. I think it spools around 3600. Im not to sure of that since if only drove it thee times since its been running.