Spooling help

[Scoobum]

At what MPH did you see 792? Reason I ask is that your 02's are leanest at the top of the track. If you stabbed it in third and let off after a couple seconds...then that 792 is gonna be a lot leaner when you go through the traps. If it was anything less than 115 mph...then I'd throw some 3rd gear fuel at it for your initial run...and then go from there. Changing head gaskets...suck s.

[Shimy87]

792 was at end of a run from a stand still to about 100. My reading about tuning said with alky I should safely be between 780 and 790 as long as no knock? I show 0.0 knock so far on these type of test runs.  Was going to leave overall fuel setting here and start to lean down 1st gear

[Scoobum]

if you went 1320 feet and saw 792...then you're fine. 100 mph in the 1/4 is a 13.6.

[Steve Wood]

I normally look for 750-760 at the line  on alky. But, I doubt you will gain much over a 790. You have the boost at 25-26?

[Shimy87]

23-24

[Steve Wood]

not getting much benefit from the larger turbo....

[Shimy87]

Ill have to crank her up then

[Shimy87]

Well had a heart stopper. 3rd test run. All is well, about 60 the car stumbled but kept pulling then about 90-100 ( I guess) I hear a big pop an hissing as the knock alarm goes off. I lift and step on brakes....hard as a rock......I figure I just popped her. As im rolling to a stop trying to get some braking I notice the tac is just sitting at 2000 so I blip the throttle. No bad sounds... I get to a stop and pop the hood. It blew the vacuum hose off the brake booster and  also off the fpr. Put both back on and all is well   for anyone that runs the track with vacuum brakes zip tie that hose!!!! I would have had a hell of a time stopping in time at the track I run at.   

I have the wastegate arm maxed in and my rjc boost controler maxed out. Will only push 24 lbs??? Its a heavy duty auctuator. Do I need a stronger spring in the boost controller??

[Steve Wood]

do you have the heavy duty actuator or is the stock actuator?  That would be maxed out for the stock.  the HD actuator starts at about 18 psi minimum.

You can take the controller apart and put a shim under the spring to make it stiffer and see what that gives you.

The reason your car was running so rich on the defaults is that Eric normally sets the fueling for about 25 psi.

Zip tie all the vacuum lines including the ones on the block on top the plenum and the waste-gate plumbing hoses

[Scoobum]

I don't bother with a controller...j ust turn the rod to the desired boost I want. On the back of your chip Eric will have the boost pressure and the high/low timing written on it.

[Steve Wood]

Two problems with that approach that I am aware of

The more you shorten the rod, the less the wastegate can open and you may get third gear boost creep because the turbo is producing more than the engine can consume...this is a problem with larger turbos

The second is that with a stock actuator, about all you can pull is 21-22 psi of boost.


The lack of the controller will make the turbo spool slower because the wastegate starts opening at a lower boost.  I don't include this as a problem because it may actually keep you from blowing the tires away when the combo is well matched and the turbo spools too fast

[Scoobum]

I haven't noticed any boost creep with this 6262...with Jasons biggie puck...and porting the wastegate hole as far as I can. Spoolup is a whole lot quicker when I pull the low gear 02's into the 750's from the 840's with Erics chip on the default setting. I run AC's 16930 convertor...se ems to be a good match for my needs. My personal preference is to run a tighter convertor...an d I can tune the low gear fuel/timing in to wake it up. I'm a big fan of PL...as it makes dialing these cars in a snap.

[Shimy87]

I dont understand how this hd actuator maxed out will only hit 24 lbs. Gonna try to shim the boost controller today.

[Steve Wood]

an hd actuator should go to about 28 psi...put a shim under the spring in the controller and see what happens...mayb e the spring is weak in it.

Do you have about an 1/8" tension on the wastegate arm?

[Scoobum]

an hd actuator should go to about 28 psi...put a shim under the spring in the controller and see what happens...mayb e the spring is weak in it.

Do you have about an 1/8" tension on the wastegate arm?

Steve...is it possible because his heads are stock...that they're a restriction... and that's why he can't jam anymore pressure through it?