ca18det help !!

[mr.dat1]

i am lost as fuck i have no idea whats wrong with it i was trying to figure it out all day and nothing its starts right up and idles perfectly but when i rev it instead of air coming out of the bov it blows out the intake

checked all vaccumn lines and they are all good ill get a video up tomorrow morning when theres light out

PLEASE HELP !!!

[mr.dat1]

heres a video i know my harness is a mess but everything is plugged in
someone please help me out i have no idea what it could be i would really appreciate it


the turbo flutter is coming out the intake not the bov

[saxx]

Are you running vacuum and boost source on the synapse bov? you need to have both.

http://www.synapseengineering.com/su...V%20manual.pdf

Check page 5 and 6 on the pdf.

[mr.dat1]

Originally Posted by saxx

Are you running vacuum and boost source on the synapse bov? you need to have both.

http://www.synapseengineering.com/su...V%20manual.pdf

Check page 5 and 6 on the pdf.

ill check it tomorrow when theres light out thanx for the heads up
will update if that fixes the problem

[mr.dat1]

bump so im guessing im getting compression surge ... when i T the bov to intake it just stays open blowing air out so the motor dies ... and the bov model i have only has the 2 nipples on the back no side one for boost

so do i need to T the back of the bov and run a hose from the front of the bov and run it in between the maf and turbo ?

[saxx]

The bov is supposed to stay open at idle. You have the new version of the bov so just connect the A & B ports to vacuum.

If you want to recirculate the air then you have to connect the front port behind the maf or you can get a anti-stall kit from synapse.

[mr.dat1]

Originally Posted by saxx

The bov is supposed to stay open at idle. You have the new version of the bov so just connect the A & B ports to vacuum.

If you want to recirculate the air then you have to connect the front port behind the maf or you can get a anti-stall kit from synapse.

yea thats what i had thought cuz when i have them bolth connected its like theres no maf it just shuts off .... so will recirculating the bov stop the compression surge completely ?

[saxx]

If you don't recirculate it the engine isn't getting all the air the maf has measured so that's why it's shutting off.

There shouldn't be any comp surge if you run a bov and it's working properly.

Does the bov close when you rev the engine? and open again when it's idling?

[Croustibat]

This bov really looks like a cheap SSQV knockoff, and like all knockoffs, leaks.

3 Solutions:
1/ bin it. The CA doesnt need one anyway, unless you did fit a big turbo on it.big means "bigger than a T28/GT2560R", and run it on more than 1/1.2bar boost.

2/ recirc it. This way even if it leaks at idle, it will still be ok, the air will be passing through the maf before entering.

3/ replace it with the real deal (yes, they are expensive, for a reason: they are designed not to leak, dual piston push pull whatever system, point is it works . And they make a fancy sound)

I went with the recirc route because i was tired being rich on idle, and having smog issues. Mine is a greddy type RS. There is quite a bit of work involved though. WIll get pics if you want.

BTW you might want to bin that fancy "air filter" and fit a proper filter if you value your turbo and engine. These are known to filter quite nothing... My tuner showed me a gt28r that was used with these filters, the compressor wheel fins are all sanded on half of their surface. Get a dry type filter, it works well with AFMs and wont hinder the flow (my CA is in the 300++ range and is working with one of these)

[mr.dat1]

its a synapse i dont think its a knockoff and i have a spare k&n filter should i run that instead ?
yea i just went to check and theres no nipple or whatever its called to run another hose to the bov imma have to find a intake pipe or just get the anti stall like saxx said .....

ill try to rev the car when its T'd on bolth and get video so you guys can check it out

[saxx]

Do you use the oe intake pipe? it has an opening for the original recirc bov. You can use it for recirc, you'll have to buy an pipe reducer fitting from a hardware store to use the hole on the oe intake pipe.

[mr.dat1]

yea it only has one nipple tho and it goes the valve cover ...

[saxx]

My bad, I forgot that it was for that haha, but I used that port for the bov.
Now I have a z32 maf so I made a new intake pipe.

[mr.dat1]

yea imma try to find a intake tube if not imma get the anti stall kit

[saxx]

You could get a bulkhead fitting, make a hole on the intake pipe, put the bulkhead fitting on there and seal it with silicone or some other sealant.

This would be the cheapest alternative imo.

[Croustibat]

Originally Posted by saxx

Do you use the oe intake pipe? it has an opening for the original recirc bov. You can use it for recirc, you'll have to buy an pipe reducer fitting from a hardware store to use the hole on the oe intake pipe.

There never was a bov on the CA18DET. The hole you refer to is for breathers, and is too small to be used for a real recirc, but it will do the trick to prevent problems with leaky valves.


As for the synapse BOV, it is a very basic single piston design. While it works well recirced or on MAP systems, it cant work as a bov with MAF systems (because it leaks). Either get their kit, which looks like the double piston design introduced by HKS and its SSQV, recirc it or get a real SSQV (or any valve that has that double piston design)

Performance wise, recircing is better, but you need some fab skills or someone who can weld. You need a 90° silicone hose, 45° bent metal tube welded together, a fitting tube welded to these to recirc, a hose to fit your MAF, and couplers (and of course a hose to go from the dump valve to the fitting)

Here is how it is done on mine. Note the recirc fitting appears to be at 90° but is not, it really comes at a very small angle in the tube, i'd say something like 15-20° .

[saxx]

Originally Posted by Croustibat

There never was a bov on the CA18DET.

Good to know, a previous owner must have put a SR sidemount ic on my car before i bought it because it had a bov/diverter.

[Croustibat]

Stock, the car has a sidemount IC (and it is pretty crappy, cant even cool the charge of the stock turbo correctly and seriously restricts flow ... slam an ebay FMIC on that and you get a very nice increase in power everywhere, and boost wont fall until 7000rpm instead of only 5000), but no BOV. S13 comes standard with the CA18DET in France, they are pretty popular here