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99 spec turbos and dyno number...what's out there

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Old 11-05-03, 11:57 AM
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99 spec turbos and dyno number...what's out there

I am waiting for my engine to be rebuilt and I have seen such a wide range of dyno numbers posted on this forum.

could those people with the 99spec turbos post there boost, mods, and dyno numbers...that would be great.
Old 11-05-03, 12:04 PM
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7 racer, I just dyno tuned this past Sunday (Nov 2) @ Rx7 Store with newly installed straight-through (nonresonated) midpipe (removed air pump). See my sig for the rest of the mods. Mustang Dyno rwhp is 306 @ 6750 rpm, 273 lb.ft @ 4750 rpm, 1.05 to 1.15 kg/cm^2 (15-16 psi) from J-spec twins. This number was after 7 to 10 hard dyno pulls (seriously heat-soaked). Also the Mustang Dyno apparently reports more conservative rwhp than the DynoJet which is what most people's rwhp numbers come from.

Tim Benton reported 360 rwhp with similar mods to mine. I presume he used a DynoJet dynamometer?

Last edited by SleepR1; 11-05-03 at 12:08 PM.
Old 11-05-03, 01:56 PM
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Mustang Dyno is said to show from 15-20% lower hp numbers which would be about right what SleepR1 is saying.
Old 11-05-03, 01:59 PM
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Originally posted by cruiser
Mustang Dyno is said to show from 15-20% lower hp numbers which would be about right what SleepR1 is saying.
306 Mustang Dyno rwhp/0.85 (assuming Mustang Dyno reports 15% lower than DynoJet) = 360 DynoJet rwhp
Old 11-05-03, 02:04 PM
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Manny,
I discovered that our dyno is not working correctly and is putting to much of a load on the cars. That is the reason for the low HP figures.

Jason
Old 11-05-03, 02:08 PM
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Tim's Graph
Old 11-05-03, 02:10 PM
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Originally posted by Jason
Manny,
I discovered that our dyno is not working correctly and is putting to much of a load on the cars. That is the reason for the low HP figures.

Jason
Wow, cool! My butt dyno tells me the car is MUCH stronger than 306 rwhp, FWIW I may roll over with radkins for a fine-tune, now that we've figured out there was a problem with the dyno.
Old 11-05-03, 08:27 PM
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good to hear....I'll post mine when my car is finished.
Old 11-05-03, 11:07 PM
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Sorry for this n00b rx7 question, but is that dip when the secondary turbo comes in?
Old 11-06-03, 03:33 AM
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yeah...it is...and its the dip that says more tuning is needed in order to smooth out the transition.

look at my dyno sheets and you can see how smooth xs was able to get it. see the sig.


j

Last edited by artguy; 11-06-03 at 03:35 AM.
Old 11-06-03, 04:15 AM
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the_glass_man: is that the stock vs. j-spec 280hp turbos comparison ? Is there really 100hp difference at 3000RPM ?
Or am I reading it wrong ?

If it is - then its a kickass
And I know which turbos will be on my car next, haha...
Old 03-26-04, 12:10 PM
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'99 Type RS/RZ Twins

Dyno Plot

Old 03-26-04, 12:13 PM
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Manny,
How did you go from 370 rwhp (on sheet) to the 306 you quote at the top??
Old 03-26-04, 12:14 PM
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Jason recalibrated their Mustang Dyno to display DynoJet chassis dyno. Don't know how they go about that. Added HKS Twin Power ignition amp too.
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