I got some weird dyno results and figured out what needs to be fixed! - FirebirdV6.com/CamaroV6.com Message Board

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I got some weird dyno results and figured out what needs to be fixed!

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  • I got some weird dyno results and figured out what needs to be fixed!

    I made two runs, one n/a and the other on the 100 shot. The first run was as follows:
    max rwhp: 148.82 @ 4700 rpm
    max rwtorque: 191.02 @ 3900 rpm
    a/f ratio: 12:1@3500 rpm /11:1@4500rpm /

    Yes, definitely rich, too rich. Over 5000rpm, it dropped to less than 11:1. I was upset w/ the hp. I know its better than that. I have driven cars w/ more hp than that and his car feels faster than those. But the a/f ration makes sense seeing how it seems to lose power in the higher rpm band. So I said whatever w/ the hp on the n/a run and decided to make a run w/ the 100 shot. Those numbers are as follows:
    max rwhp: 150.83@4600rpm
    max rwtorque: 191.46@3900rpm
    a/f ratio: 11.62@3500rpm / 11.53@4500rpm

    How in the world could the hp number from the 100shot run be the same as the n/a run? The bottle was just filled. The rear wheels didn't break loose. The clutch is still slipping. The engine revved right up to 6000rpm in 3rd gear just like I had it in neutral. Just to verify, we made a third run and it had the same results. It's a little too rich for my tastes. I would like to see it in the low 13s/high 12s which will not be a big deal. Just a little reprogramming to adjust that. Ben told me that I should see around 20-25hp gain once I do some fine tuning. But the clutch is still an issue which really pisses me off! :mad:

    [ September 26, 2004, 10:03 PM: Message edited by: Jerriko ]

  • #2
    well if the clutch is slipping how is any power gonna be transferred to the wheels? get a clutch and be ready to be amazed...also i think the 148 is probably right w/an A/F ratio like that, u prob could get another 15-25 w/some tuning...
    <b>Black</b> 1998 Pontiac <i>Firebird</i> A-4 swap<br />271.4rwhp/259.4rwtq NA<br />13.30@102.44 <br /><a href=\"http://www.freewebs.com/wickedsix98\" target=\"_blank\">www.freewebs.com/wickedsix98</a>

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    • #3
      Yeah, I can't really say anything until I get the clutch fixed. Since I already burned through a dual friction and now I am having issues w/ the spec3, the only option is the bellhousing that I had to have customized. The geometry must be off concerning the pivot point for the shift fork. There must be some drag still on the throwout bearing. I was hoping in getting a couple more good runs is this year but it may have to wait. :(

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      • #4
        Uhm, sounds stupid but, it may be you're pushrod to the slave cylinder (If you have one).
        When I got a dual friction I had to make the pushrod longer, seriously. It was new but it kept slipping, weird huh?
        ---Niño---<br /><i>95\' silver 5 spd</i>

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        • #5
          I was thinking it was that too. I made some extras ones all of different lengths, some shorter, some longer. It didn't seem to help. Either way, too much hydraulic pressure was being displaced on the shift fork. It's like I need to attach a spring on the shift fork to keep it from engaging the throwout bearing.

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