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4.8 compression ratio and head chamber size? How much power?

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Old 01-03-2007, 04:11 PM
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yes it was a t76. non bb. i dont have much experience with different ar's.
Old 01-03-2007, 05:34 PM
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so how long until the 9.99 pass We know you can do it! Quick question, on the wideband and my factory 02's, should I leave both of the factory ones in place and weld in an extra bung for the wide band before the turbo flange? I'm thinking the drivers side manifold can just be in the stock position right by the flange and the passenger side turbo manifold (building a sorta log style setup) have the 02 bung near the front (since this is the way the exhaust gas will be flowing, does this sound accurate). Should I keep both and add wideband or get rid of factory's and just use a wideband?
Old 01-03-2007, 05:46 PM
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Originally Posted by 1FSTZ71
so how long until the 9.99 pass We know you can do it! Quick question, on the wideband and my factory 02's, should I leave both of the factory ones in place and weld in an extra bung for the wide band before the turbo flange? I'm thinking the drivers side manifold can just be in the stock position right by the flange and the passenger side turbo manifold (building a sorta log style setup) have the 02 bung near the front (since this is the way the exhaust gas will be flowing, does this sound accurate). Should I keep both and add wideband or get rid of factory's and just use a wideband?
I'd leave the stock O2's. The WB NEEDS to be after the turbo in the down pipe. The back pressure from the turbos will throw off the WB quite a bit if its before the trubo.
Old 01-03-2007, 08:21 PM
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Thanks for the info! You think my idea of mounting the stock O2 near the front of the passenger side manifold wil be good? Or should I mount it down near where the stock one would be in the up-pipe from the drivers side
Old 01-03-2007, 09:56 PM
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If your building it the way I think you are, then I'd put it after the log, before the turbo, if that makes since
Old 01-03-2007, 10:15 PM
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LOL ya I get what you mean. It's going to have a 90 degree upwards with the turbo mount right at the #2 cylinder. So I figured on mounting it right there. Does it matter if the gate is before or after?
Old 01-03-2007, 11:17 PM
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I'm going to be building a similar setup shortly, and I plan on putting the WG in the cross over underneath right close to the down pipe, like Trick Flows kit. Personally, I don't think it matters where the WG is as it is just releasing pressure in the system.
Old 01-03-2007, 11:20 PM
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cool, I'm thinking of mounting mine on the log, ease of access for anything
Old 01-03-2007, 11:25 PM
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Here is where I put it on the last kit I did, this is a LT1 and some people didn't like that it was not in the middle of the y, but it will still work just fine and was most convenient for me.
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Old 01-03-2007, 11:40 PM
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Ya I am thinking of running mine by the 90 degree turn up on my log and dumping the gate back into the downpipe as well. Figure that way if anything needs fixn it's easy access Figure a Tial 38mm should hold up fine under 10-15psi on this 4.8
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