BW S372r not flowing air...(Leak Found)....I hope
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BW S372r not flowing air...(Leak Found)....I hope
guys, set up as follows:
B18C1 84.5mm / 10.0 :1 CR
ported head with edlebrock mani/70mm tb
3" I/C piping with T1 I/C
FR Divided Manifold/ BW s372R with 1.10 Hotside
pro 1 cams
at boost of 28psi car was making 570 whp/410 ft lb.(i think this was kinda low). thing is that although boost was holding rock steady, after 7500 rpm a/f ratio was going from 11.5 to 10.2. needed to take out about 20-25% of fuel from 8000 and up to maintain a 11.4 a/f ratio. this tells me that around 7500 to 9200 the turbo is flowing less air than when full boost is attain up to 7500.
what can be the caused for this.
thanks
B18C1 84.5mm / 10.0 :1 CR
ported head with edlebrock mani/70mm tb
3" I/C piping with T1 I/C
FR Divided Manifold/ BW s372R with 1.10 Hotside
pro 1 cams
at boost of 28psi car was making 570 whp/410 ft lb.(i think this was kinda low). thing is that although boost was holding rock steady, after 7500 rpm a/f ratio was going from 11.5 to 10.2. needed to take out about 20-25% of fuel from 8000 and up to maintain a 11.4 a/f ratio. this tells me that around 7500 to 9200 the turbo is flowing less air than when full boost is attain up to 7500.
what can be the caused for this.
thanks
Last edited by b00sted EK; 10-09-2009 at 06:14 AM.
#3
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Re: BW S372r not flowing air.....?
pro was not degreed. was goin to adjust on the dyno. so with a boost leak, the boost level would still show it is holding?
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Re: BW S372r not flowing air.....?
Pro-1's need to be adjusted properly before you start looking for the problem, they are not drop in cams.... well the new Version3's are but more than likely yours are not, if they are off you should see less than optimal numbers....
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Re: BW S372r not flowing air.....?
Now i'm no expert on degreeing so i won't say anymore on it as someone with more knowledge should explain why it is needed to be done.
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Re: BW S372r not flowing air.....?
a/f ratio was going from 11.5 to 10.2. needed to take out about 20-25% of fuel from 8000 and up to maintain a 11.4 a/f ratio.
Maybe that is telling you something, cam related?head related? just a thought.
Maybe that is telling you something, cam related?head related? just a thought.
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Re: BW S372r not flowing air.....?
I would check for exhaust leaks pre-turbo (manifold,turbo,wastegates) and boost leaks test to insure is not leaking at any coupling, BOV, TB, or even IM gasket. Check your valve clearances and copression/leakdown test. Hopefully one of those would give an answer.
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Re: BW S372r not flowing air.....?
if boost is holding steady like he said? why would you recommend he check for leaks? thats makes no sense.
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Re: BW S372r not flowing air.....?
umm boost can hold steady with boost leaks, the bigger the turbo the easier it is to maintain pressure levels. I'm not saying that's the problem, I am saying just because it's holding steady that doesn't mean it's not the problem.
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Re: BW S372r not flowing air.....?
The only leaks that i'm seeing that could "hold back" power are very large ones. and to me 28psi is quite abit to be holding steady and have pre/post leaks.
Just another opinion over here.
Just another opinion over here.
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Re: BW S372r not flowing air.....?
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Re: BW S372r not flowing air.....?
And def those cams need some tweaking.
Last edited by Schister66; 10-06-2009 at 03:35 PM. Reason: Learn (not to be an ass) then post
#16
Re: BW S372r not flowing air.....?
If the head wasn't ported or you had a smaller hotside I'd say you're flow restricted but from the sounds of it you're as wide open in all areas as you need to be... definately points to the cam timing.
#17
Re: BW S372r not flowing air.....?
How do you know if you have the version3s or the old style pro 1s that need to be degreed?
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Re: BW S372r not flowing air.....?
watching.. similar problem - different car, different setup but same symptoms. I too think it could be a boost leak (at least for my issue).
#21
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Re: BW S372r not flowing air.....?
You can have a boost leak and still hold plenty of boost. You WILL make less power than if you are holding that same boost without a leak.
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Re: BW S372r not flowing air.....?
Those cam gear settings seem a little suspect.. If I remember correctly, the Pro1's require a 4 degree lobe separation..
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Re: BW S372r not flowing air...(Leak Found)....I hope
well foud out that the map sensor (not used btw) casing I had on the TB was cracked. pulled it out and all around the casing was starting to open up. hope that is where the boost leak was coming from.