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Old 01-15-2013, 06:23 PM   #1
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ok, bone stock motor 275 hp, (A4 Trans so, roughly 250 RWHP)

Add TB coolent bypass
Add intake elbow silencer delete
Add K&N true cold air intake

where do ya think i'm at?


my rough guess, would be... about 20 hp increase... K&N has a dyno sheet showing a 18.2 hp increase with there intake... and i believe it... the car is much better now. plus i did the TB bypass (people swear 5+ hp at hot engine temps)

THEN...
Magnaflow Cat-back
1.6 RR's with LT4 springs
PCMforless tune

i'm hoping to hit between 325-340 RWHP.

does that sound feasable/realisic?
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Old 01-15-2013, 06:43 PM   #2
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no way you're topping 325-340 rwhp behind an a4 without a cam

not all horsepower adding modifications stack up with simple addition. something that adds 5hp on a bone stock engine might add 10 or 2 on one that's been modified

i don't buy 20hp from a cold air intake either, that's crazy talk, unless somehow your engine bay was so friggn hot and your old air filter was clogged, and it was freezing outside. hmmm wonder how that would have happened.. maybe from idling for quite a while in an ice cold unheated k&n brand dyno shop? ....
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Old 01-15-2013, 07:17 PM   #3
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Well for comparison, a 95 Firehawk which has an arguably better CAI with its Ram-Air set-up was rated at 300fwhp, a 25hp increase. With the optional cat-back exhaust you got another 15hp, bringing the total to 315fwhp. Typical drivetrain losses are ~15-18%, so that's roughly 260-265rwhp.

I guess it's feasible to make 18.2hp more at the flywheel with a K&N CAI. Maybe 3-5hp for the TB bypass. If you put in the cat back, maybe 15-20 hp and another 10 for the 1.6rr, so I'm guessing you'd be about 325fwhp/275rwhp with a good tune.
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Old 01-15-2013, 07:19 PM   #4
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Quote:
Originally Posted by Gamikatsu View Post
ok, bone stock motor 275 hp, (A4 Trans so, roughly 250 RWHP)
Actually, a bone stock LT1 F-body dynos about ~230rwhp.
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Planned 383 rebuild: 195cc competition LT4 AFR heads, custom cam grind (still debating specs), 6" or 5.85" rods, forged internals

Upgraded T56: Viper mainshaft and 2nd gear, steel 3/4 shift fork, Billet keys 1-4, bronze shifter cup, internals Cryo'd and REM'd
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Old 01-15-2013, 08:47 PM   #5
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Quote:
Originally Posted by 95 Firehawk View Post
Actually, a bone stock LT1 F-body dynos about ~230rwhp.
Mine dyno'd 265 rwhp stock, with some bolt-ons 309 rwhp. 325 rwhp is unheard of but not impossible I guess.
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Old 01-15-2013, 08:57 PM   #6
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this isn't a very good comparison but my bone stock 01 slp ss camaro m6 only made 280rwhp and 320tq on the dyno and i have owned lt1's as well and know them both pretty good, but i think you would be very lucky to break 275rwhp in an a4 with the mods you have done considering my heads cam 355 lt1 a4 made right around 360rwhp. Not trying to be a dick here just stating the facts.
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Old 01-15-2013, 09:23 PM   #7
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Quote:
Originally Posted by andersons1994z28 View Post
this isn't a very good comparison but my bone stock 01 slp ss camaro m6 only made 280rwhp and 320tq on the dyno and i have owned lt1's as well and know them both pretty good, but i think you would be very lucky to break 275rwhp in an a4 with the mods you have done considering my heads cam 355 lt1 a4 made right around 360rwhp. Not trying to be a dick here just stating the facts.

280 whp with 320 tq? Isn't that a bit high for the torque?
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Old 01-15-2013, 09:53 PM   #8
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Quote:
Originally Posted by lt1-xjs View Post
Mine dyno'd 265 rwhp stock
With what intake and exhaust? That would put you in the 315fwhp range or else you only lost 10hp in the drivetrain, which isn't possible.
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Old 01-15-2013, 10:27 PM   #9
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Quote:
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280 whp with 320 tq? Isn't that a bit high for the torque?
I got a pic of the dyno sheet if you wanna see it lol
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Old 01-15-2013, 10:32 PM   #10
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Not doubting you lol. Most 280 whp usually tic around 300ish.

Nice numbers though
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Old 01-15-2013, 10:44 PM   #11
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Quote:
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Not doubting you lol. Most 280 whp usually tic around 300ish.

Nice numbers though
I know i was just being a smart ass lol. but ya i know i was surprised my self when i saw those numbers especially for being bone stock.
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Old 01-16-2013, 03:48 AM   #12
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Mods with dyno results
WS6.COM

here are some dynos of Ls1 LT4 LT1 and Z06 Vettes

Dyno Results

LT4 engines some dyno weak and others much better?

Grand Sport Dyno Page


I still enjoy this page as it lists various mods and the track results in the Heavier Impalla's with LT1's

Dynamic Top ETs
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Old 01-16-2013, 10:25 AM   #13
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Don't be one of those hp number idiots. Race your car at the track, that will tell you how the motor performs. There are a few variables that can askew this number but your mph will tell you the most about your motor's power and drivertrain's loss.
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Old 01-16-2013, 11:13 AM   #14
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Quote:
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...a few variables...
there's one big gigantic variable that makes track testing a poor measure of a car/engine and its capabilities.... wait for it...

the driver!!

the human element in drag racing makes track times the most unscientific testing method for performance available

ever seen someone run a 15 second 1/4 in a Z06 vette? i have...

lets try to draw some conclusions.. factoring its weight, that thing is sub 250hp now? or lets assume we know the crank horsepower already, so it has a 50+% drivetrain loss?

a before/after on the same dyno would probably be the best metric, unless you're a very practiced driver that is always within half a tenth of your car's capabilities
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Old 01-17-2013, 10:32 AM   #15
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I said mph, not et. You can easily inflate dyno numbers.
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