ATTN:Jesus....or any other Single Turbo Supra owner.

830 Views 2 Replies 3 Participants Last post by onenrg1, Jan 10, 2002

boostedsupratt

Discussion Starter · Jan 10, 2002

Jesus,

I am asking for your advice on my problem because you have a very similar setup as me, as far as blow off valves. Anyways, here is my question. It sounds to me that right after I let off the throttle and shift I can hear what sounds like backpressure on the turbo and then the bov kicks in. I have two blitz SS bovs and a single. I think the delay in the bov is being caused by 1)my vacuum lines being too long or 2) the vacuum lines are not hooked up correctly.
I was wondering where you hooked the vacuum line of your bov's up too. I have my boost controller (hks ez) tied into one of the bovs and then it goes into an outlet from the right side/center of the intake manifold. (I wish I had a pic). Then I have the other vacuum line from the second bov going to an outlet on the bottom/forword/right side of the intake manifold. But anyways...there seems to be only 2 intake vaccuum outlets that I can tie into on the intake manifold. I wish I had 3 so I didn't have to tie my boost controller into one of the bovs.
Any ideas would be helpful. Thanks ahead of time.

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Magic

· #2 · Jan 10, 2002 (Edited)

I am using an HKS racing type II BOV. This BOV is suppossedly good for up to 800 hp. I am having the same problem you described on my single car. I tried to adjust it and it did not help.

Next I will try running a slightly thicker vaccume line OR try running a dedicated vacume line. My vacume line is VERY long since the BOV is located in the fender.

You may want to try tapping in an extra vaccume nipple on the back of the manifold. I have also thought about doing this.

Lance at Toyomoto suggested switching to the "Godzilla" BOV sold by Turbonetics.

If you do come up with a solution to this problem, please let me know since I am also interested insolving this delema.

Thanks,
-pete

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onenrg1

· #3 · Jan 10, 2002

boostedsupratt said:
Jesus,

I am asking for your advice on my problem because you have a very similar setup as me, as far as blow off valves. Anyways, here is my question. It sounds to me that right after I let off the throttle and shift I can hear what sounds like backpressure on the turbo and then the bov kicks in. I have two blitz SS bovs and a single. I think the delay in the bov is being caused by 1)my vacuum lines being too long or 2) the vacuum lines are not hooked up correctly.
I was wondering where you hooked the vacuum line of your bov's up too. I have my boost controller (hks ez) tied into one of the bovs and then it goes into an outlet from the right side/center of the intake manifold. (I wish I had a pic). Then I have the other vacuum line from the second bov going to an outlet on the bottom/forword/right side of the intake manifold. But anyways...there seems to be only 2 intake vaccuum outlets that I can tie into on the intake manifold. I wish I had 3 so I didn't have to tie my boost controller into one of the bovs.

Any ideas would be helpful. Thanks ahead of time.

My vaccuum is obtained directly from the intake manifold for the bov. At first with the blitz I had that problem. I assumed it was because I only had one Blitz BOV. I switched to that HKS type II and it works perfect. No more back pressure on the turbo.

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