1toofastlt1

iTrader: (4)

I am running a wastegate and bov on my ysi set up. My problem is that it will only make 5 psi. And I'm pretty sure that its not belt slip. I think that either the wastegate or bov us bleeding off boost. I'm running the standard size vacuum line right off the intake to the bov and wastegate... Is this ok or do I need bigger line or do I need a bigger vacuum source like the vacuum line going to the brake booster ?

95bowtie

The vacuum source should be fine as long as its tee'd from one line on the intake to two seperate lines going to each.

If you have a 18# pulley setup or something on there and its only making 5# then yes one of them is not working properly.

1toofastlt1

iTrader: (4)

Ok maybe I will remove the wastegate and give it a go to make sure that's not the issue

stevieturbo

What engine, what pulleys etc ?

If either valve is leaking, you should hear it.

And I would run dedicated lines to the BOV and W/G

Although depending on how you have them configured, it could explain the lack of boost.

1toofastlt1

iTrader: (4)

It's a 383 stock ported heads cc305 shortie headers. I have a 7.8 crank pulley and a 3.33 blower pulley with a 8 rib belt. What do you mean by configured? Thanks

stevieturbo

How have you the signal lines connected to the BOV and W/G ?

You arent spinning it very hard, although you should see more than 5psi.

1toofastlt1

iTrader: (4)

I tried putting a 2.95 on the v7 but still only made about 5 psi. What kind of boost do you think I should make at 6500rpm with those pulleys? I will get some pictures up today of my set up and how I have the lines so you can see.

1toofastlt1

iTrader: (4)

I fixed the lines and now the wastegate is working. I'm making about 7 psi with a 7.8 inch crank pulley and a 3.33 pulley. Spinning the engine to 6000 rpm. Does this still seem low? I'm wanting 15psi

stevieturbo

How much boost, and at what rpm's does it make the boost ? And does boost rise with rpm, or does it level out at any point ?

And again, how do you have the BOV and W/G lines etc configured. And if you are trying to make say 15psi, why do you have a wastgate connected at all ?

1toofastlt1

iTrader: (4)

Here is a video of under the hood of my car. I will get a video of the car at wot so you can see the boost and rpm.

1toofastlt1

iTrader: (4)

here is a video of me going WOT from 2k to 6k rpm. as you can see the boost crawls up to 7 by almost 6k. I know its way rich. im still working on a 2 bar tune.

stevieturbo

What you're doing seems to be correct.

I would find an alternative solution to tee-ing all those hoses though and run dedicated lines where possible.. And for the BOV and W/G I'd run a 1/4" ID rubber hose the entire length, trying to make any hose runs as short as possible.

Blowing into the top port of the w/g should ensure it stays shut. Likewise with the BOV, and as it has a weaker spring etc it will open when there is vacuum in the line. The BOV should be open at idle.

Apart from those small issues, the install looks sound.

So does boost rise in a linear fashion as rpm's rise ? If there was belt slip, it could rise, then level or fall. Likewise if the w/g etc was blowing open.

It's been so long since I only ran about 15psi or so, damned if I can remember what pulleys I used. Might have been around 8.25/3" or so, really cant remember


I just spin the **** out of it now and make it work lol.
Ive an 85T/28T on it. My 382 LS makes about 15psi at 4800-5000rpm. Although my unit is quite old now. I generally shift around 6700rpm.

1toofastlt1

iTrader: (4)

Looking at my log the boost slowly climbs as the rpm rise. I am shifting at 5900-6000 I can try shifting at 6500 and see if I make more boost or if it just levels out. I have a 2.95 blower pulley I can use too. I had it on there before and it didn't make any more boost. Where did you buy your cog pulleys?

stevieturbo

My car isnt a Camaro, and pretty much everything is custom made.

Although I think pulley offset etc will be pretty much the same as the generic Vortech stuff ( I am using a Vortech 28T upper )

stevieturbo

My car isnt a Camaro, and pretty much everything is custom made.

Although I think pulley offset etc will be pretty much the same as the generic Vortech stuff ( I am using a Vortech 28T upper )

1toofastlt1

iTrader: (4)

Ok what about your crank pulley. My set up is almost all custom made too so I don't have a problem reworking it for a cog set up

stevieturbo

Crank pulley in what respect ?

I just use a Powerbond damper with an adaptor to a custom made cog pulley. But I think the dimensions of this will be pretty much the same as the big black generic Vortech pulleys, as I copied it off that, although made alterations to minimise the size of the pulley ( ie it's only 52mm wide with no flanges and running a 50mm belt )

1toofastlt1

iTrader: (4)

I removed the wastegate and ran a single line from the manifold to the bov and I went over all the t bolt clams and made sure they were good and tight. Did a pull and still only about 5-7 psi at 6k rpm. Do you think I'm not spinning the blower enough?

1toofastlt1

iTrader: (4)

They say that every step you make smaller on the blower pulley will make about 1-2 more psi. So if I am Making 7 psi with a 3.33 and drop to a 2.95 I should make 11-15 correct?

stevieturbo

I guess that depends what your step size is. Dont think it's just as straightforward as that.

But if you have the pulleys it would be worth a try.

Also ensure your BOV isnt leaking, and there are no leaks in the plumbing anywhere