You may be right but it does make me wonder when I see this:
If he really dynoed 232rwhp/280rwtq stock, I'd be rather disappointed with a mere 23rwhp/15rwtq gain from all those mods if I was in his shoes.
they were underated and they did not make 205-210 at the rear wheels stock
I got 255 rwhp and 295 rwtq on my 94 Cobra with bolt ons. Bolt on include FRPP headers, Bassani X with cat, flow cat back, 3.73 gears, 65mm TB, Pro M 77 MAF meter caled for 94\95 cobras and home made CAI, FRPP extender.
Stock I dynoed 232 rwhp and 380 rwtq.
Is it your thinking that you loose 12.5% in the drive line
Grady
Speeds8erM-1 said:You forget the 3.73's negate some of the power gain
Gears should not make any difference on the Dyno. The dyno will tke into acoount the difference between the roller and engine rpm's and calculate accordingly.
You forget the 3.73's negate some of the power gain, the extender probably wasnt worth much, picking up 23 rwhp from those mods really isnt that bad. You would see alot more gains if you started from a non Cobra 5.0 and did the boltons plus a Cobra intake and GT40 Irons. It's all in perspective.
+1
I've asked more than one dyno guy that Q
They said the choice of ratio makes no difference
like you said ... they ask for that info before they do the pull
Grady
To expand on that, they input what your rear end ratio is, and you do the dyno run in 4th gear, which is a 1 to 1 ratio. If you really want to get a headache, we can talk about why dynoing an automatic is iffy at best.
Its all about the engine dyno....
Adam
It is posible to get a cobra over 300 rwhp with bolt ons and some head and intake work.I got my stuff done at a local speed shop here in cali they ported the upper, lower and ported and polished the heads with a 3 angle valve job and ported my headers to match the ported exhaust ports and with a tune and the stuff in my sign I got barely over 300 rwhp .I spent about 1,000 dollars with everything and I know you guys might say I should of spent it on better heads but I just wanted a little more power while keeping it looking stock when I open the hood and I was satisfied with the results.
What shop did you take your car to?
-James
94 GT AODE Vert
You may be right but it does make me wonder when I see this:
If he really dynoed 232rwhp/280rwtq stock, I'd be rather disappointed with a mere 23rwhp/15rwtq gain from all those mods if I was in his shoes.
Grady, the extender adds more under the curve and removes the tip in retard.
I gained .6 tenths in the 1/4 with the mods.
Now what is defined as "bolt ons"? Heads? Intake? TB, headers.
HP = RPM*TRQ / 5252
If you use numerically higher gear ratios, you are increasing the trq multiplier. More trq equals more HP. You will never lose HP by using shorter gears.
Adam
+1
I've asked more than one dyno guy that Q
They said the choice of ratio makes no difference
like you said ... they ask for that info before they do the pull
Grady
Wrong, you will LOSE POWER on a Dynojet with a steeper gear, check out www.ls1tech.com where people actually dyno their cars back to back.
Dunno on a Mustang dyno, dont care either as the operator has so much input on the numbers it;s not even funny.
:OT: ls1tech is a joke. All those people do is race dyno's, nobody goes to the track. Ed Curtis calls it LS1toke.com for a good reason.
If you have 2.73 gears, the tires will rotate 2.73 times for ever 1 time the drive shaft rotates. If you have 4.10 gears, the wheels will rotate for every 1 time the drive shaft rotates.
The increased wheel rotation will cause the well to rotate more. Engine RPM stays the same though. So I ask you this... if the operator doesn't input the gear ratios, then how in the world is any dyno accurate?
The operator enters in the differential ratio to negate the effects of the differential gearing. The operator runs the mustang in 4th gear to negate the effects of the transmission gearing. That way there are no variables in the drive train, its just a 1 to 1 ratio for the duration of the pull.
Someone correct me if I'm wrong, but in my dyno experiences the operator has always asked for gear ratios.
Adam
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