Unichip boost control help??

[BradC]

what boost gauge vac gauge do u have?

Stewart Warner - like this, but -30 to 15

 

[jmv]

hmm. mine reads 18 too at idle.

speaking of idle, how is yours??

 

[low_psi]

Just put in an ATP WGA. With the Unichip boost controller off, it spikes to around 8 and bleeds back to around 5-6.

With the Unichip boost controller on, it spikes to around 13-14 and detonates to hell.

This is normal behavior for the Unichip and a replacement actuator. JDM Sam and I made a new boost map on my car for that setup. I believe JMV is using it now, maybe he can comment on how it works on his car. I'd give Sam a shout about getting the boost map loaded onto your UC brain.

 

[BradC]

This is normal behavior for the Unichip and a replacement actuator. JDM Sam and I made a new boost map on my car for that setup. I believe JMV is using it now, maybe he can comment on how it works on his car. I'd give Sam a shout about getting the boost map loaded onto your UC brain.

Even with the boost controller off? That's odd, what causes that?

 

[BradC]

hmm. mine reads 18 too at idle.

speaking of idle, how is yours??

Before I replaced the WGA, it would drops a few hundred rpm's when the fans kicked on...but now it seems to hold steady once warmed up. The FMM makes it a little rougher than before, but she idles steady at 750.

As far as vacuum...IIRC, it should read around -20 at idle, no? I never had a boost gauge until recently, and that is when I noticed the spiking from the old WGA going out, and since then it has been at 18 at idle.

 

[low_psi]

If you're spiking 13-14psi from just the WGA, you have a leak.

 

[Lodivigo]

I also have a Stewart Warner that reads 18 at idle. On decel. it'll usually dip down to 20.

 

[BradC]

If you're spiking 13-14psi from just the WGA, you have a leak.

I think I misunderstood what you said earlier. I spike 13-14ish from the UC boost controller, on just the WGA, it hits 8 and bleeds back to 5-6ish

 

[low_psi]

Yes, that is normal with the replacement WGA.

 

[jmv]

This is normal behavior for the Unichip and a replacement actuator. JDM Sam and I made a new boost map on my car for that setup. I believe JMV is using it now, maybe he can comment on how it works on his car. I'd give Sam a shout about getting the boost map loaded onto your UC brain.

unfortunately i'm not, my unichip is fried right now. It wasn't working when i had the boost tuned anyway.

Your idle seems like its good BradC.... but i know for me, even when i had the UC hooked up with the boost controller off, i held at 7 psi.... i dunno why yours would be different. But i would try hitting up JDM Sam.

 

[Professor MSP]

Guys:

Here is typical behavior for my car (my modifications are in my signature):

Unchip boost off: A spike to 7.08.5 psi occurs and then I hold 5.56.0 psi at redline. The spike occurs at the higher end of the said psi range the denser is the air and/or the higher are the rpms when I go WOT. This behavior is independent of the timing map setting.

Unchip boost on: A spike to 11.513.5 psi occurs and then I hold 8.59.0 psi at redline. The spike occurs at the higer end of the psi range the denser is the air and/or the higher are the rpms when I go WOT. I only run timing map A when the Unichip boost controller is on.

At idle I read 2122 in. Hg with the lights and AC off.

 

[BradC]

Guys:

Here is typical behavior for my car (my modifications are in my signature):

Unchip boost off: A spike to 7.08.5 psi occurs and then I hold 5.56.0 psi at redline. The spike occurs at the higher end of the said psi range the denser is the air and/or the higher are the rpms when I go WOT. This behavior is independent of the timing map setting.

Unchip boost on: A spike to 11.513.5 psi occurs and then I hold 8.59.0 psi at redline. The spike occurs at the higer end of the psi range the denser is the air and/or the higher are the rpms when I go WOT. I only run timing map A when the Unichip boost controller is on.

At idle I read 2122 in. Hg with the lights and AC off.

Gotcha. Car seemed to run better today, drove a lot of miles today and it seemed to be running better.

I didn't get to play with the boost controller, but with it off I would spike 8-9ish and hold 7 until redline.

We shall see tomorrow what its like with the boost controller on. Also going to check for leaks.

Thanks for all the help/ideas so far guys.