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Thread: Dyno Disaster

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    Dyno Disaster

    Just did a dyno, attached,


    AFRs on the dyno look good in 4th gear, better than my data logging..... and they could not get the torque nos... but power was exactly as I guessed 430 awhp




    But the whole dyno experience was a disaster.... something broke.... apparently


    On the dyno the car spat the bit on the 2nd pull.....

    THN as I drove home there is a loud rattle under 50 mph in front right hand side of the car, worse at lower speeds like something is rattling around in there.. Anyone have any idea what it could be

    Dyno was 60 miles from home so I just got back and have sent the car to my local guy now, car was okay or so it seemed driving home at speeds >> 50 mph but the rattle under 50 mph is horrendous...... sounds almost like a large metal ball in a metal cage


    Click here to enlarge
    2005 Porsche 996 TTS RWD - Eurodyne 60-130 in 6.50s
    2015 Audi A3 2.0 TFSI - Eurodyne 0 - 100 in 10.67s
    2015 McLaren 650S (RHD) - UK - 1/3rd owner yet to drive


    Click here to enlarge



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    sorry to hear that, hard to diagnose without seeing or hearing it. Take pictures or videos and post.
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    I actually just found the video I took, sounds like on 2nd pull something went wrong with the PSM off,


    like the screeching of brakes as they grind on metal
    2005 Porsche 996 TTS RWD - Eurodyne 60-130 in 6.50s
    2015 Audi A3 2.0 TFSI - Eurodyne 0 - 100 in 10.67s
    2015 McLaren 650S (RHD) - UK - 1/3rd owner yet to drive


    Click here to enlarge



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    Some 4wd dynos dont have front and rear rollers connected, so you risk breaking your transfer case/front diff due to front and rear wheel speed being diffrent.
    Click here to enlarge
    997.1 tt
    Kline 200cell exhaust
    997.2/GT2RS IC's
    Cobb E85 custom stage3 tune by Mitch
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    Sachs stage 2.5 clutch

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    BTW sorry to hear Click here to enlarge
    Click here to enlarge
    997.1 tt
    Kline 200cell exhaust
    997.2/GT2RS IC's
    Cobb E85 custom stage3 tune by Mitch
    ID1000 injectors
    Sachs stage 2.5 clutch

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    Great to know
    2005 Porsche 996 TTS RWD - Eurodyne 60-130 in 6.50s
    2015 Audi A3 2.0 TFSI - Eurodyne 0 - 100 in 10.67s
    2015 McLaren 650S (RHD) - UK - 1/3rd owner yet to drive


    Click here to enlarge



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    .

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    Of course porsche has a more complicated system than most, but speed differences between front and rear is apperantly "bad".
    Click here to enlarge
    997.1 tt
    Kline 200cell exhaust
    997.2/GT2RS IC's
    Cobb E85 custom stage3 tune by Mitch
    ID1000 injectors
    Sachs stage 2.5 clutch

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    Ironic that it was the only AWD/4WD dyno I could find anywhere

    Thanks for the advice, could well be the diff as there is some data on 6speed about similar occurrences and noises

    Last time I dyno other than using my own speed and data logging which hit the awhp nos right on the head anyway. I feel stupid now, anyway have to go away for the weekend to godawful Atlantic City with the outlaws so will revisit the fun next week

    Click here to enlarge
    2005 Porsche 996 TTS RWD - Eurodyne 60-130 in 6.50s
    2015 Audi A3 2.0 TFSI - Eurodyne 0 - 100 in 10.67s
    2015 McLaren 650S (RHD) - UK - 1/3rd owner yet to drive


    Click here to enlarge



  10. #10
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    I got the recommendation to remove the front diff and use a rear wheel dyno, but it got very expensive.

    I think you need to find a 4wd mustang dyno.
    Click here to enlarge
    997.1 tt
    Kline 200cell exhaust
    997.2/GT2RS IC's
    Cobb E85 custom stage3 tune by Mitch
    ID1000 injectors
    Sachs stage 2.5 clutch

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    Should have went to MRP

    AWD dyno and both rollers spin with the tires.

    Bring it to Tim and have him look at it.
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    Both rollers were spinning with the tires.... eff knows why it happened as they do GTRs, Porsches, STI's etc on this dyno all the time.... if it is JUST the diff I may just go RWD

    Click here to enlarge

    ... by the sound of it at low rpm it probably is the diff (reading other blogs about this problem) as it sounds like ball bearings and metal running around down there somewhere...... anyway I am back in the city with my E39 and left the 996 at my guy in Quogue to have a look... have to take the outlaws to Atlantic City for a few days

    Also, apparently your mate Tim had his car on this same Dyno (Vinny Ten Racing) a while back for their open day... but I understand he is RWD yes
    2005 Porsche 996 TTS RWD - Eurodyne 60-130 in 6.50s
    2015 Audi A3 2.0 TFSI - Eurodyne 0 - 100 in 10.67s
    2015 McLaren 650S (RHD) - UK - 1/3rd owner yet to drive


    Click here to enlarge



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    Click here to enlarge Originally Posted by folgrz Click here to enlarge
    Should have went to MRP

    AWD dyno and both rollers spin with the tires.

    Bring it to Tim and have him look at it.
    BTW where does Tim work from ?

    Phone number + address
    2005 Porsche 996 TTS RWD - Eurodyne 60-130 in 6.50s
    2015 Audi A3 2.0 TFSI - Eurodyne 0 - 100 in 10.67s
    2015 McLaren 650S (RHD) - UK - 1/3rd owner yet to drive


    Click here to enlarge



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    Does Porsche shift the driveline split to the rear when you hit a certain speed? That would explain why it went away over 50mph and would also likely confirm the diff.

    Sorry to hear man. Drink some wine in Atlantic City to help ease the pain.

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    Thanks all, will revisit next week...
    2005 Porsche 996 TTS RWD - Eurodyne 60-130 in 6.50s
    2015 Audi A3 2.0 TFSI - Eurodyne 0 - 100 in 10.67s
    2015 McLaren 650S (RHD) - UK - 1/3rd owner yet to drive


    Click here to enlarge



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    That dyno doesn't look right at all. What's with the weird dip?

    Really need to see the torque numbers as well.

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    The weird dip kind of matches the dip I see on the Durametric tests and the Eurodyne data logging..

    AT 3200-3500 rpm up to 4500-4800 rpm the car pulls timing, tries to up fueling, then as it gets to >> 5000-6800 rpm it starts upping boost again and power spikes up....

    This data log is from a 3rd gear pull on the old GIAC tune, but it does similar with the new tune...... I will update after I get back to the Hamptons later next week and when the front end mess is worked out

    AFRs are better on the new tune but it still pulls timing

    WOT 3rd 1 Old ECU.pdf
    2005 Porsche 996 TTS RWD - Eurodyne 60-130 in 6.50s
    2015 Audi A3 2.0 TFSI - Eurodyne 0 - 100 in 10.67s
    2015 McLaren 650S (RHD) - UK - 1/3rd owner yet to drive


    Click here to enlarge



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    2005 Porsche 996 TTS RWD - Eurodyne 60-130 in 6.50s
    2015 Audi A3 2.0 TFSI - Eurodyne 0 - 100 in 10.67s
    2015 McLaren 650S (RHD) - UK - 1/3rd owner yet to drive


    Click here to enlarge



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    Tried datazap.me for the logs? Upload csv and play around/share etc. Beats excel hard on log viewing Click here to enlarge
    Click here to enlarge
    997.1 tt
    Kline 200cell exhaust
    997.2/GT2RS IC's
    Cobb E85 custom stage3 tune by Mitch
    ID1000 injectors
    Sachs stage 2.5 clutch

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    Click here to enlarge Originally Posted by Group.america Click here to enlarge
    Both rollers were spinning with the tires.... eff knows why it happened as they do GTRs, Porsches, STI's etc on this dyno all the time.... if it is JUST the diff I may just go RWD
    some 4wd is more like a double rwd dyno, measures power on both axles and adds the numbers, but there is no mechanical connection so there is no guarantee front and rear is at same speeds.

    Porsche fancy 4wd goes nuts trying to compensate and shift torque to stop rear/front axles from "spinning" faster.
    Click here to enlarge
    997.1 tt
    Kline 200cell exhaust
    997.2/GT2RS IC's
    Cobb E85 custom stage3 tune by Mitch
    ID1000 injectors
    Sachs stage 2.5 clutch

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    Click here to enlarge Originally Posted by xbox_fan Click here to enlarge
    some 4wd is more like a double rwd dyno, measures power on both axles and adds the numbers, but there is no mechanical connection so there is no guarantee front and rear is at same speeds.

    Porsche fancy 4wd goes nuts trying to compensate and shift torque to stop rear/front axles from "spinning" faster.

    Thanks mate... I really do not need to dyno again because my software logging got the numbers right to 1 awhp.... the data logged torque numbers were about 560 crank torque at 4300 rpm (maximum)... so pissed with myself that after searching for dynos for 3 days and then picking Vinny 10 I did not ask for help on here.. trying to do anything in the Hamptons is a joke... a rip off joke and that means driving 50+ miles to do anything

    We live and learn.... it really may just be better to go straight to RWD, saves some 75 lbs weight and adds 25 whp... off to Atlantic City

    Click here to enlarge
    2005 Porsche 996 TTS RWD - Eurodyne 60-130 in 6.50s
    2015 Audi A3 2.0 TFSI - Eurodyne 0 - 100 in 10.67s
    2015 McLaren 650S (RHD) - UK - 1/3rd owner yet to drive


    Click here to enlarge



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    Fun Saturday NOT

    Quogue to NYC to Queens to Atlantic City, get call from my dog sitter, someone or something poisoned my dog or so she thinks... take him to the VET I say. nope.......... drop missus and outlaws at Taj Mahal, drive back to Queens, get dog, drive to Riverhead hospital and the dog is fine, just a stomach bug or something

    400 miles in 9.5 hours, one pee stop, one sick dog

    Went to look at the 996 today and there may be a bigger problem then I thought... axle looks effed... how in fook does a dyno chew a diff and axle
    2005 Porsche 996 TTS RWD - Eurodyne 60-130 in 6.50s
    2015 Audi A3 2.0 TFSI - Eurodyne 0 - 100 in 10.67s
    2015 McLaren 650S (RHD) - UK - 1/3rd owner yet to drive


    Click here to enlarge



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    Click here to enlarge Originally Posted by Group.america Click here to enlarge
    BTW where does Tim work from ?

    Phone number + address
    Message Tim on 6Speed, "Tim941NYC" Explain the situation and I'm sure he'd offer to help you out any way he can (whether you decide to repair the AWD system or convert to RWD).

    Click here to enlarge Originally Posted by Group.america Click here to enlarge
    Also, apparently your mate Tim had his car on this same Dyno (Vinny Ten Racing) a while back for their open day... but I understand he is RWD yes
    Yea he's RWD
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    Click here to enlarge Originally Posted by benzy89 Click here to enlarge
    Message Tim on 6Speed, "Tim941NYC" Explain the situation and I'm sure he'd offer to help you out any way he can (whether you decide to repair the AWD system or convert to RWD).


    Yea he's RWD
    Thx mate, I sent him a PM the other day... sick of pussy footing about, may just send car to him

    He is in Dix Hills yes ?
    2005 Porsche 996 TTS RWD - Eurodyne 60-130 in 6.50s
    2015 Audi A3 2.0 TFSI - Eurodyne 0 - 100 in 10.67s
    2015 McLaren 650S (RHD) - UK - 1/3rd owner yet to drive


    Click here to enlarge



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    Click here to enlarge Originally Posted by Group.america Click here to enlarge
    He is in Dix Hills yes ?
    Not sure, but prodigymb & @folgrz are both close with Tim, in addition to 2Swoosh (6Speed) & Undercover since Tim has helped with his 996 Turbo build. So I'm sure any of them can help you get in touch and testify to how helpful he is.
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