Another disappointed result, TR 224
Another disappointed result, TR 224 I'm kinda disappointed w/my results of the tune, it only put down 331/342 w/98 LS1 w/a TR 224 112lsa and longtubes through an A4, AF was 13:1 pretty much whole way, and a steady curve (i'll have the graph tomorrow, cars still at the shop, they just called earlier) I dont know if thats cut out closed or open, but i doubt the bullet is that restrictive at all. I mean its not bad, but the car but down 316/341 with !CATS, lid, and a cut out, 15rwhp and 1rwtq doesnt seem like much of a gain to me, what do you guys think?
Yeah, well alot of bolt on cars i see do more than that, have you done a compression test, check to make sure your firing on all cylinders, i would say you should have no less than 370 hp and 380 tq.
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Joined: Jun 2005
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From: England
Originally Posted by ls1wannabe
Yeah defiantely something doesn't seem to be right,
Was it the same dyno for instance?
If not, was it the same type of dyno?
Where either set of dyno numbers being corrected?
If YES then to what standard?
If NO then what where the local atmospheric conditions and tempertures like for each dyno run?
What altitude was the car dyno'd at?
With answer to these and other questions you would then have enough knowledge to say with any confidence whether a possible problem exists or not.
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Joined: Jun 2005
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From: England
Originally Posted by 98NBM_TransAm
It runs fine, seems to pull hard, i dont get it
Remember a dyno is primarily a tool for tuning, NOT a measure for BHP.
There are so many factors that can affect the results. In addition to the above questions, you need to ask:
Was the dyno configured correctly?
What gear did they dyno the car in?
Have there been any drivetrain mods (gears/12 bolt/stall) between the orignal dyno run and the latest?
What tyres and pressures where you running on both occasions?
Remember there are a great deal of components between the engine and the rear wheels. If the TQ is slipping you will get greatly distorted results. Yet the engine may well be producing EXACTLY the amount of BHP expected.
For piece of mind the cheepest option would be to take it to another dyno and see what it makes on that. If the results are within 5% of the last one then you can assume the dyno is being fairly accurate. Which means you most likely have an issue with the engine and/or the drivetrain.
To further check, run it down the 1/4 mile and see what it's trapping. If you know the vehicle weight and trap speed you should be able to make a guesstimate of how much BHP was required to move 'x' weight to 'y' speed over a 1/4 mile distance.
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Originally Posted by Mike K.
does seem kinda low, I hit 372 with that cam with SLP headers and no tune at all.
I have worked on three in the last two months with the same combo and all pulled 360ish (sae) before tune. These all did have a LS6 intake though. The tuning got two in the 370+ range and the other right at 380. I would be interested in knowing your spark advance at the highest g/cyl fill vs. the entire rpm range at WOT. Also, was there any KR logged?
Last edited by SideStep; Nov 10, 2005 at 07:50 AM.
my buddy that lives near me has a SS a4 w/ 224 cam, verter, and mac mids and he did 360rw tuned w/ unlocked verter through a 10-bolt w/ 3.23s. he's got ported TB, lid, ud pulley, etc etc but No ls6 intake. Id say something is amiss IMHO
Can i not have compression in a cylinder and not be able to tell by driving it? I know i've had a plug wire loose before and the car ran like crap, but it doesnt now, it idles fine and everything, just 331 seems so low, i mean if i did a compression test wouldnt i be able to tell before hand that there might be a problem by how the car runs? The car did 328 before the tune w/the cam and longtubes, if it is a compression problem what could it be?
Yes you would be able to tell before hand if there was a problem, you said you check the wires though. It may be something with the tune then, picking up only 3 rwhp off a tune is not normal. What program were you tuned with?
HP Tuners, on a dynojet, the guy is credited with being a very good tuner, i dont know if its the tune just because of the base run of 328, even untuned it should do better than that, so its probably not a compression problem?