Speed Inc duals just installed with dyno....
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Joined: Feb 2003
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From: The South
Speed Inc duals just installed with dyno.... I just had them installed, havn't picked the car up yet will do that wed night after work. It pulled 320rwhp with air fuel ratio just over 12(it's a 1998) with LT's, Duals, lid and filter. Does that sound about right? I was hoping for a little more and I don't know the torque till I pick it up. Also, the guy said something about the converter being unlocked at the time and that they usually get 18-20 additional rwhp with it locked. Does that sound plausible? I don't remember anything like that but then again what do I know 
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Joined: Dec 2001
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From: Cypress, TX
Re: Speed Inc duals just installed with dyno.... I'll bet your restriction now is going to be on the intake side. You're getting plenty of air out, but not enough air in. I had the same problem. I had cam, longtubes, and true duals, but could not get it very far above 360 RWHP (I have an M6) even without cats on the stock heads. Changed to an LS6 intake, and it jumped 17 rwhp and 17 rwtq WITH cats installed.
Thread Starter
11 Second Club
Joined: Feb 2003
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From: The South
Re: Speed Inc duals just installed with dyno.... Okay, does anybody have a somewhat specific idea of how much higher it would dyno with the converter locked? I know it should be higher but does anyone know how much? I'd really like to know. I'd sure like to think it had another 20rwhp or tq than it does. I picked it up today, it dyno'd at 320rwhp/337rwtq. Torque curve looks really nice. AFR was a nearly constant 12.0-12.2. It does not sound the way that I expected it too. It is almost too quiet for my tastes but does have a really nice sound. Very remiscent of open header just much quieter at very low throttle and the further my foot gets in the more aggressive it sounds. It screams through the upper RPM's. I still won't be satisfied with the sound till I get something like a Hotcam in it though 
The SOTP is a very nice increase, as it should be 
Edit, BTW: It's a full 3" dual into and out of the X-pipe with the 12" dynomax bullets and turndowns aimed slightly back and to the sides.
The SOTP is a very nice increase, as it should be Edit, BTW: It's a full 3" dual into and out of the X-pipe with the 12" dynomax bullets and turndowns aimed slightly back and to the sides.
