typical gains from dyno tune?

[s346k]

just curious of the typical gains found from a dyno tune? i was looking for 300 whp unlocked from this setup...

96 lt1 pulled from an impala ss
cc503
crane gold 1.6rr
1.5" primary / 2.5" collector flowtech long tubes with 2.5" true duals w/40 series flowmaster mufflers dumped at the axle
4l60e w/ 3k tci stall
12 bolt rear w/ 273 gear and 28" tire

the 1st pull on the stock tune with those mods was something like 248 whp
the final pull after "tuning" was about 260 whp

i am in the process of getting the graph scanned and uploaded.

this was on a dynomite dyno...

i know the exhaust setup is not optimal, but i was looking for a larger gain from the tune. the engine runs fine. i don't know how those dynos compare to others, but i don't feel it was tuned very well. it stalls and hunts for an idle regardless of engine temp an gets terrible mileage. afr is somewhere between 11.9 and 12.3 throughout the pull. too rich if you ask me. the guy only did 3 dyno pulls total.

we've got some 433 gears and are currently hunting for a set of 1 3/4" headers. we are also in the process of researching tuning software so we can tune it ourselves. thanks in advance.

[s346k]

edit: this was on a dynomite dyno and it dynoed 245 stock tune and 257 tuned.

[shadowbandit]

my car. intake and cat back untuned made 269hp 315tq

[Joker Z28]

I dont like those numbers

[s346k]

no shit guys lol neither do i, hence the thread. unfortunately neither of those responses were helpful, at all.

any insight? is it the tune? the engine?

[Joker Z28]

Its really hard to say without being there.

Yea you should be making more power then that but unless that dyno reads really low its hard to tell.
How does it perform? Go to the track and see what kind of times/60 foot you get. Those numbers mean more then dyno stats.

[s346k]

i'm really wanting to know what kind of gains i should've seen from a dyno tune...as opposed to why are the numbers low.

i know dynos are tuning tools etc etc. i just want to know if i should be looking at the engine or the tuner. 12 whp from a dyno tune on a cammed motor doesn't sound right to me. the motor runs fine, never been at a track. it will lay freaking 60' of rubber from a dead stop with the 275/60s on it and really doesn't have any trouble gettikng up and going from 50 or 60 even.

[gregrob]

What is WOT AFR and what does the timing curve look like?

What does it trap at the track vs what it weighs. That's the most accurate way to measure hp.

[s346k]

hasn't been to the track and most likely won't go. my question is this:

on average, does a cammed lt1 car only gain 12 +/- whp from a dyno tune? that's my question.

you guys really don't read posts very well, do you? hahaha

[CamaroZGuy]

you should pick up more then that from a dyno tune, it sounds like a real bad tune. my bolt on motor with a mail order tune picke up 25ish whp. sounds almost like the person doing your tuning dose not know what he is doing.

[sacmaros]

i would say get a whole new exhaust sytem to me it still sounds restricted specitaly with flowmasters....when i had my tuned on the dyno compared to the street tuned i picked up over 40-45 rwhp and i had k&n cold air,march under pullie,pacesetter longtubes,no cats,qtp cutout to a crapmaster..lol,msd wires,cc503 cam,1.6rr,springs,pushrods, and i made 327 rwhp in a 6speed...i wasent happy with it and the car was also running like shit crapping out at 5800 rpm thansk to the msd wires...but i picked up 15 from just opening the cut out after it was all tuned...hope it helps you at all but i say frist off switch the exhaust and ur auto wont help on the dyno only the track..lol :peace2:

[Joker Z28]

hasn't been to the track and most likely won't go. my question is this:

on average, does a cammed lt1 car only gain 12 +/- whp from a dyno tune? that's my question.

you guys really don't read posts very well, do you? hahaha

It depends on how your motor was before the tune. Do you know what your AFRs were before tuning the car?

[s346k]

here is what i've got. it is difficult to read, i apologize. first run afr was between 13.7 and 13.1 looks like.

http://i95.photobucket.com/albums/l126/s346k/El%20Camino/elcodyno1.jpg

http://i95.photobucket.com/albums/l126/s346k/El%20Camino/elcodynograph1.jpg

[s346k]

this is a well respected lt1 tuner in this area, or so i thought. a 700 whp e85 / n2o car hit his rollers right behind us. i am guessing he made more than 2 pulls to tune that one.

edit: i don't know that true dual 2.5" 40 series flowmaster mufflers are all that restrictive. the 80 series crossflow for your car, yes...these muffles, not so sure.

[Joker Z28]

If I was reading that right, just by basing on the AFRs, it still needs some tuning.
For N/A being close to 13.0 at WOT would be ideal. I know the AFRs have some room to move but I dont like how its at 13.6 at the higher RPMs.


Just so you know, I am no where near considered to be a tuner, im just basing it off of everything I have read.

[s346k]

i agree. i am not a tuner either, but i know what makes cars go. the motor appears to be way rich, but picked up power everywhere...as it was LEAN on the initial pull. so wtf?

i figured it should pick up more power from a full tune. we're def purchasing a wideband o2 and software to tune it ourselves. paid way too much to have a "professional" do this for us. what sucks is he is the only guy within like 100 miles i know of that tunes lt1s.

it may have to go to the track just to see what we're dealing with. i have no idea how those dynos are supposed to read, but i do know that my lid/muffler ws6 will flat out destroy this vehicle from any speed and any rpm. granted, the car is strong, it should not run away from a cammed lt1 as such.

[blownSS]

yeah my budy has a 96 impala with 1.6 rockers magnaflow mufflers intake 160 stat and hypertech and it made 245 to the wheels. either the tune is off or something is not flowing right

[LSWHO]

I picked up SUBSTANTIAL power from a butt dyno tune. This sounds like a mockery of justice.

[s346k]

updated with better dynograph images.

ya we're purchasing some software and doing it ourselves. i want to get into tuning, and i think this is a good way to start.

[s346k]

after looking the engine over this weekend i determined it was only running on 7 cyl, and apparently has been since its inception. i always thought it could've ran smoother and seemed sluggish, but i figured a 273 geared lt1 would act as such hahaha. it runs much better firing on 8 cyl.

i wonder why the tuner wouldn't notice such a thing? i guess it doesn't surprise me, to be honest. he obviously didn't care to investigate why it dynoed so low.

[blackbird1084]

That is insanely low. My TA with just a cat-back and 52mm tb dyno'd 256 back when i first got it and it's an auto. The track is the real test to how much you gained with any mod. It looks like he smoothed out your dyno graph quite a bit. I miss almost always shows up on a dyno graph. I think it may be safe to say your around 280-290 rwhp but you'd have to take it to the track and get some times.

[s346k]

i dunno, beats me. the truck has never ran as good as it does now. i'd love to take it to the track, but it needs some brake attention beforehand. we just swapped a set of iroc rear disc brakes to it, but i think it needs a new master, as well. 1972 brakes ftl. we also swapped the factory 273 open dif rear for a 433 posi.

[ksmyss]

We don't "dyno" tune our cars. We street and driveability tune them then put them on the rollers to make final small adjustments.

[79LT1Monte]

I know if you ask ten people about a tuner you will get ten different opinions of said tuner but if he made three pulls with your car on seven cylinders I wouldn't want him working on mine. Hope you get some better numbers now, my 96 B-body LT1 with the same cc503 and 1.6 rr and near identical exhaust set up made 327 rwhp. But I agree with what has been said throughout this thread dynos are a tool for fine tuning and the track is a much better indicator of power level and a hell of a lot more fun than watching someone spin rollers.

[95mysticta]

A friend of mine got a mailorder tune that made 344rwhp then decided to take on his own tunning and made 411rwhp. It was a stock shortblock with le2 h/c