This I'm sure is not a new question... but I have yet to find some good feedback regarding it, so I'd like some strait answers if possible on you tuning experts out there. I am running the stock CTSC kit and plan on upping the boost some, I am still running the stock recirc. Thinking about this I was wondering if there is a way either through a blow off valve or some other device to be able to have the option of bleeding off some boost pressure if I want too... and have it be steady at this psi I adjust for and reliable long term. The main reason for my interest in this is I am upping the boost to an 8 psi or 4" science of speed pulley, but am still currently running the factory fuel ejectors with a vafc. I have some room to lean out the afr ...but 8psi is going to most likely take me over safe levels. It is a pulley that was available to me however.... so I am going to experiment with it.

If there is no way to bleed off boost, then I imagine the logical next step is to upgrade the fuel ejectors right? Can I just install say 440cc - 550cc injectors with the stock ecu and call it good or is the car going to choke and run like shit? I do not want to switch to a stand alone .... so what are my minimalist options? Is there a good piggy back unit for the ejector upgrade that I will need? If so does it take the place of the vafc..how does it all work? Your input is appreciated.

 

from what i have read 7psi tends to yield power that will bring the injectors very close to 100% duty cycle. as a rule of thumb any higher than 7psi and you will larger injectors.

why not just pick up some 550s and have the headroom while you're at it?

 

Yeah that's what I hear also, however I am willing to experiment. I added some more to my post regarding the upgraded ejectors. Any thoughts? If you don't know for sure that's cool, I'd like to get some strait definitive's on my fogginess.

 

S2000Junky,

First I want to thank you again for giving me the great info regarding tuning with VAFC,

Both s2k_RN and myself have decided to moving forward with upping the boost level by going the Emanage Ultimate + bigger injector route, after talking with a few people with S/C + Ultimate on this board as well as my local tuners, this seems to be the best route if you want to keep your stock ECU.

However, for me, due to lag Funding, I won't be able to afford this upgrade this year, so I will still be doing the VAFC tune we talked about. RN on the other hand, might have this done pretty soon, so he should be able to provide lots of great info with his tune and cost.

 

Great thanks man for your reply, glad I was able to help you sort things out there, and thanks for your input here on my thread

From what I understand the E manage is a more extensive piggy back unit that is only accessable through a laptop for accessing its programming. I was hoping to to steer away from managment like this and go with something more like a VAFC for controlabilty on the fly, but i am not famelier with what is on the market for this. I think if I was going to go with something progamable like the e manage that i might rather go ahead with looking at stand alone options.

Are there any recomendations for on the fly piggy back units on the market for working with upgraded fuel injectors? And does anyone have thioughts on the boost bleed off question? Thanks guys

 

Are you still running the FPR from the Comptech kit?

I am in a similar boat as you...I have the stock Comptech kit but the stupid thing won't boost over 4.8psi I can't find the leak. I have thought about slapping on the SoS 8psi pulley to see what happens.

 

There is no product that is being marketed to bleed off pressure for a supercharger, your best bet will be a wastegate or self reseting pressure relief valve. With out getting into details there are a few issues associated with venting presure like this. Using a BOV would be easy but most will not work quite like you want without modifications.

 

This is what I am interested in, but have little understanding of BOV's and what is possible and what isn't in my goal with the ctsc. Do you have much experience in this field? Can you provide me with some more information or at least point me in a direction to where I could gain some more understanding with this concept? Thank you

 

[QUOTE=SuzukaBlueAP2,Sep 5 2008, 08:46 AM] Are you still running the FPR from the Comptech kit?

I am in a similar boat as you...I have the stock Comptech kit but the stupid thing won't boost over 4.8psi I can't find the leak.

 

Here is an article from Synapse Engineering, they have a product that is highly tunable w/o a boost contoller.

The trick will be tuning it to open at the specified pressure. Then you will have to balance the exiting flow so that it does not exessivly cycle on and off or open too slowly and over boost.

http://www.synapseengineering.com/pdf/syna...ct-brochure.pdf

If you want a relief valve you can try something like Greddy's relief valve but, without modifications you will probably vent to much.

http://www.greddy.com/products/display/?Ca...&SubCategory=18

Another way to do this is to restric the inlet of the blower with a valve or fixed oriface.