as you can see on my dyno sheet after i hit 8psi my boost falls to 6.5 psi at red line. i have a blitz sbc-id boost controller and and ive been trying to mess with the gain so it can hold the boost longer. but i get severe spikes if the gain is too high. i fixed the boost spike that you see on the sheet by turning down the gain one %.
also when ever i feel like i got it just right, the next day or so when i punch it i would spike bad and i have to re adjust the EBC to boost 8psi. does my delta gate2 need to be retired?

oh yeah now that i have the z32 maf the 8psi graph cleaned up real nice.

 

people are gonna bash me, but I bet thats you're prob...seen a lot of cases, go with a Tial.

also what spring is in the wg?

 

.............. 4 psi ..................

 

i wanted to get a 38mm tial for the longest

 

I think there some "rule" with EBCs and springs that once you go over/around half of the springs set PSI rating it starts stretching and can start to taper off boost...so you might wanna look for a plain 8lb spring

 

well actaully it isnt a true 4 psi spring. its 5-7 psi spring and you adjust the top screw to tune it to your desired amount. but i understand what your trying to say,im just trying to save the auto tranny. i drive around at 5psi, race at 6.5psi and for tougher competition i run 8psi. if i got with a 8 psi spring i wont be able to do that.

 

You need to figure out if it's a spring or boost controller issue first, I would imagine some of both.

A new spring in the deltagate could help, or change to a Tial 38 as it bolts to your same flange. There is a .4 (5.8psi) spring for the tial that sounds like it would be a good match for you, or even a .5 (7.25psi) spring.

I don't know about your boost controller, but for spiking I turn gain down and turn boost up. Boost builds slower, but doesn't spike.

You could also look for a different controller that allows more adjustability. Mine allows manual adjustment at different rpms, and also what speed you want it to set in. In this case you could just crank the top end up.

 

what ebc do you have???

 

never mind you have the greddy

 

What are your EBC settings?

 

apex AVCD. and I loove it!

 

turbonetics delta gate 2's have been known to cause lots of problems. i didn't find that out in time and bought one. hopefully it will be a while before i experience any trouble with it (minus the ****ty diagram trouble that i've had to deal with that caused the waste gate not to open which then allowed my turbo to spool to 15 psi which is quite dangerous on this turbo when non-intercooled).

i'd also go with a tial wastegate as suggested above... if the wastegate is indeed the problem.

 

I don't think (or understand) the spring would cause the problem you describe. Your spring is supposed to hold 5-7 psi and your boost controller is taking over from their. If the spring is stretching you would see less boost WITHOUT the boost controller.

Anyways, setting the gain high is giving you the spikes. Hal explained it well earlier. Set the gain lower and let the boost climb slower. The setting you want, if you have it, is duty. If you have a duty setting, turn that up in the higher RPM range when you see the boost fall off.

 

Not bashing, but I see every ounce of my 10 psi to redline with my deltagate wastegate

It may not be gate2 or it may be.. but I saw similar problems when I was @ 7 psi.. but funny, I don't see it @ 10

 

after seeing your dyno sheet i was very p!ssed off because i saw your power stay the same all way through to the redline. and im not gonna stop till mine is the same.

 

i use the manual settings for the best results
boost: 27% - 28% (it matters on what kind of day it is. sometimes it
doesnt even reach my desired psi and sometimes it
spikes to 9!!)

gain:17-19 it matters how bad im over boosting

 

nope i dont have a duty setting.

 

thats the old school apex-i ebc right?

 

i think what happens is these deltagates get kind of stopped up from carbon buildup on the valve after awhile. that's what i was told anyways so now i've been waiting for the worst with mine.

 

what size exhaust do you have?

 

3 inch turbo back

 

Since you say you use manual settings, does your boost controller have auto settings. Mine has either and if I set the boost in auto mode it has to 'learn' that setting. I like this because it knows how much solenoid duty to add in the higher RPMs.

If you have an auto boost setting try that.

 

i guess its time to pull it off and look at it and change the spring or just replace it with a 38mm tial and call it a day

 

i didnt know that it had to learn in auto. i tried auto but it wasnt boosting any where near 8psi then it spiked to 9.8psi so i stuck with the manual settings. I'm gonna keep messing with it.......
oh yeah and i gotta make sure scramble boost or the speed map fucntion isnt on, because that can the problem also........i just read about it in my manual.

 

Try auto setting like pawstar just told you. If that dont work, how long are your hoses that are giving your solenoid the boost reading? It tells you in the instructions under a certain length. If they are over that length shorten it up by relocating the solenoid box. If that doesnt work then your solenoid box might be damaged which I doubt. If that dont fix your issue then switch out your wastegate. Your boost should not fall off right at peak, it should hold a bit. I forgot the settings I had my Blitz SBC-ID at. Play with it at a lower PSI setting until you see what you want.

 

i took it out for some runs sat. night with the gain set to 3 and it held well. and then after a few runs from a stop it overboosted bad and the car started bucking and pausing at 4ooo rmp. so i adjusted the ebc a little and i was fine. i seriously think its the 35mm deltagate 2 i have. i saw a tial 38mm on ebay for $210 im thinking of getting it.

 

the instructions that i have dont state the maximum hose length

 

If it's over 2ft, I'd move it and try running as short as possible distance for a few test runs.

 

Also, what compressor wheel and turbine A/R does the "custom built Turbonetics big shaft t3/t4 turbo" have?

 

Q trim(if i remember correctly) .63a/r

 

Sorry, Q-trim doesn't mean anything to me, do you know which of these:

http://64.225.76.178/catalog/compmaps/fig14.html

 

oh it has a t04e 60

 

i just checked and the charged side hose is alittle more than 1 ft long and the waste gate hose is is about 3 ft.

 

WG-->BC Solenoid is 3ft?

You might try shortening that for a few test runs.

 

but why all of a sudden am i having this prob at 6psi i didnt have this prob

i wil try it though

 

Kink...crack in hose, don't know really.

Just something easy to try until you feel like replacing the WG or something else.

Also, I'd search other websites for this problem and see what they've run into.

 

i will check it out

 

One more possible idea/theory, what was your AFR like?

 

11.5 is lean as it gets without spark knock