Dyno numbers

Discussion in 'Small Block Tech' started by bherbert, May 23, 2018.

  1. Fox's Den

    Fox's Den 355Xrs

    I made power at 6200 with the TA DP intake it can do it. No question about it.

    Torque at 4200 is about right that is why I say as soon as you start to up the cam the tq convertor needs to go to 2500.
    dyno sheet 390 hp.jpg
    Dyno Sht Lunati cam.jpg
    The first dyno sheet is with the TA 510 cam I used back in 1994 then I switched to the Lunati Popular Mechanics cam which is the cam in the second dyno sheet. The second dyno sheet is not my engine but is similar in parts used.

    As you can see the TA 510 cam held onto the HP longer than the Lunati cam and you could tell with that cam it died at 5800 where the TA 510 cam held on. These engines are not 455's where the TQ comes in at 3000 rpm it takes longer with the 350.

    Who knows where the TA single plane SP3 comes in at, no one has dynode it.

    I made 310 TQ and 280 Hp on the rear wheel dyno. On the same day with the 125 shot of nitrous it made 460 TQ and 420 Hp at the wheels.
     
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  2. Extended Power

    Extended Power Well-Known Member

    We are taking Haydn's car to the track tonight.
    We will get a weight for it today as well....then we should know what the stroker is making for power.
     
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  3. Buick#455

    Buick#455 Well-Known Member

    Can’t wait for the track results! Post up some time slips!!
     
  4. Extended Power

    Extended Power Well-Known Member

    I will put the updates in our build thread, and not high jack this one.
     
    bherbert likes this.
  5. MrSony

    MrSony Well-Known Member

    what
     
  6. Jclstrike

    Jclstrike Well-Known Member

    Numbers seem in line. Here is my car on a wheel dyno but its was the first time ever so we decided to not push it and stopped at 4800rpms. Since then I have switched to roller rockers & the SP3 intake. Once I get the qjet hesitation that has plague me for a year I will take it back and get a 4800 for comparison and then rev her up and see what she does. Hopefully sometime since summer. FYI my 350 is running T/A c113 cam, 9.4 compression, heads have larger valves and mild port job, QJet 750 cfm carb.
     

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  7. Dano

    Dano Platinum Level Contributor

    Hey Bob, how you been? Got to see your car last fall @ your Dad's for the 1st time since seeing it in your garage many years ago. Looks nice!

    I never dynoed my old 350, but it made good power (ran 13.0's with crappy 60' times) with a pretty basic build - not too far off yours (KB C118, big valve ported heads, QJ, 10.25 SCR, etc.) but had headers & and a T/A intake w/3.73's $ 2-1/2" exhaust - No crossover (& of course M-21). You should've bought that car:). I'm doing another similar one. I miss that car. Most fun GS I ever owned.

    Even before the resto/rebuild, it just had a KB MKII, headers & intake/exhaust/rear and ran 14.0's @ 103-104 (horrid 60' times but it flew on the top end) before I missed a shift & bent a valve so it was making good HP even then.

    Bottom line, I'd do the headers & 2-1/2" exhaust w/ X or H pipe first & them an intake. Both I think would help. Then getting the timing & carb dialed in. Lots of help on here for that.

    Then I'd do rear gears (350's respond very well) and then a trans - 200R4 or you can also get steeper 1-2 gear planetary set for the TH 350.

    I'm either going to go with the lower 1-2 gears in my '71 350/350 with 3.55/3.73's or more likely leaning to a 200R4 and 4.10's.
     
    bherbert likes this.
  8. 8ad-f85

    8ad-f85 Well-Known Member

    I'd ignore the numbers and go by track data.
    Forget that drivetrain losses are difficult to calculate...the fact that the dyno's programming itself has NO way of calculating inertial compensation for your combination.
    Some Co's wheel dyno's have pre-programmed inertial calcs intended for a motorcycle.
    The only way to factor those numbers out is to do steady state testing.
    It might be tough to hold these engines steady on those dynos.
    Beyond that, where the temp sensor is aimed will have tremendous influence to the weather correction calcs.

    As far as comparing post # 26's dyno numbers...am I correct in seeing the crossover rpm for hp/tq as 4112?
    That cannot possibly be legit.
    Error maybe or am I looking at that sheet wrong?
    [Edit...never mind, I see that it never reaches 5252 and the metrics are scaled differently]
     
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  9. bherbert

    bherbert Well-Known Member

    Got the headers. Dog keeping guard - wish me look on the install.
     

    Attached Files:

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  10. sean Buick 76

    sean Buick 76 Buick Nut

    Love the dog had a few so similar
     

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