I recently built a stock cube motor for my APS TT system: Mahle Pistons, Manley 6.125 rods, and stock crank. I am running the stock heads with Patriot Dual Springs and a GT-11 Camshaft.

I have lost a few pounds of boost due to the cam swap and would like to get the red springs (the next step up).

How much are they and where did you get them? I don't see any need to dyno my car until I get the boost level up to where I want it.

Thanks

 

Based on the way you phrased your question, it sounds like you feel stronger springs will get back some of the boost pressure. Is that correct??
If so, have you also given thought to the fact that a cam that is not designed for a TT application can cause boost to be lost.
What are the specs on the GT-11 Cam?

BJK

 

It's a lingenfelter spec boost cam.

APS has used it themselves on their f body system.

 

The Comp GT-11 cam has a 215/231 .631/.644 118LSA (w/ -13 overlap)

Here's the link :

http://www.lingenfelter.com/store/ls1-gtapp.html

 

I followed the link that m_ledez posted and the GT-11 is a NA cam recommendation for the ls1, ls2, ls7. The fact that APS used it in an f body car is interesting.

Here is a link to the info I was thinking of when I raised the question.
http://forums.corvetteforum.com/show...2&postcount=12

 

I understand that, but once again both APS and Lingenfelter use this cam for turbo applications. My thread isn't about my cam choice, but my fix for boost loss that will occur almost any time a more aggressive cam is put in place of the stock cam.

Back to the topic:

My question is about the red springs. Who has them in stock and about how much do they run?

 

Conrad, got your email....I'll just answer on here. I would first check with Forge Motorsports - 407.447.5363, since more than likely your using their FMACAPS actuator set, give them a holler and let them know your current springs are not generating the results and you would rather use the (#12) Red Springs and they should just send you a set at no charge. Otherwise it's a few bucks.

Another great source would be Geoff or Tom at Next Level Performance, I would suspect they have some in stock or have easy access to get them.

On the "Reds", at one point I tighten the plunder rod at least 4-5 threads in, just tight enough so you can put the actuator cap on without it touching the plunger, that will be the least amount of tension you can set and should yield 10/11 psi with the EBC off.

It can all depend on the preload created when tightening the plunger into the actuator...meaning, the plunger has a threaded shaft, the further the shaft is threaded into the actuator arm, the tighter the wastegate is pulled shut,= the higher base boost pressure it will create, one can differ 1-2 psi just on the tension created.

Did you mentioned about adding another nozzle to your meth setup? In talking with Julio at AlkyControl, he suggested at the +700rwhp power level, a dual nozzle system would be a smart.

Damn, I'm looking forward to your results!

 

Brabus, you da man! Right now with the yellow springs my actuator arms are bottomed out (if fact, I shortened the arm slightly to get more boost). I'll try setting the Red springs 2-3 psi higher with the mityvac and we'll see how it reacts. Thanks for the advice....I'll call Forge tomorrow!

 

We actually shorten the Garrett actuator rods for all aps C6 systems we install. There are not enough threads to set appropriate preloads for higher boost. We are able to hold 11psi with the garrett actuators with modified adjustment range. We are also appropriately modifying the Forge actuator thread range as we assemble them onto each turbo. Sometimes we trim off some threads or possibly use a shorter arm.
From my days with Forge Motorsport and designing the actuators for use in numerous turbocharged vehicle applications, green spring is 7-10 psi, yellow spring 10-14 psi, blue 14-17 psi, and red 17-20+. If your not getting in that range with the appropriate spring, there must be a leak or fault in movement of the arm.

Tom