Dynamometer Results & Comparisons - Low dyno numbers??? Am i wrong?

I put my car on the dyno to tune it. long story short. 315hp 316tq. with tune!? wtf? whats the deal i was expecting more than that. i watched my buddys stock 01 T/A put down 307 at the wheels! although his was an m6 and mine is an a4 would there be that much dif? im reading where cam only cars with simalar bolt ons are making 350-380? my car runs strong im not let down just wondering if there is more and i just cant figure out what im doing wrong here?

mods.

k&n filter
slp lid
no screen maf
p&p tb
rebuilt stock ls1 heads(milled .012)
melling hp/hv oil pump
vinci cam. 278/286 @551
ebay lts, custom Y, flomaster
tuned by GM engineer with hp tuners

i realize im short an intake and tb but should i be making more power or am i where i should be? just wanting some input before i tear it down this winter.
thanks. chad

any ideas????

I generally don't think much of dyno numbers until I see MPH to back them up in the 1/4. What happened at the track? Maybe needs a little tuning.

went 12.98 at 108 with a 2.0 60ft on stock street tires. basiclly what a damn stock ls1 car can do. that was before gears but it still sucked.

Kill the flowmaster. I gained +70rwhp and +80rwtrq with a bypass of the slowmaster exhaust.

Do a compression check on your rebuilt motor.

yeah dont let the dyno numbers fool you. I dyno'd at 383rwhp and thought i should have a little more but still trapped 119mph in the 1/4. Runs like a wild ape if you ask me! lol

What kind of dyno was it also?

What springs are you running?

Kill the flowmaster. I gained +70rwhp and +80rwtrq with a bypass of the slowmaster exhaust.

70rwhp? and 80 rwtrq? really? I just don't by that, did you mean 7rwhp and 8 rwtrq?

The flomaster is the problem. Put a cut out on it or put a different muffler and your power will be where it should be.

flowmaster is bad, get a cutout and see what happens.

went 12.98 at 108 with a 2.0 60ft on stock street tires. basiclly what a damn stock ls1 car can do. that was before gears but it still sucked.

:jest:!!!!!!!!

That is NOT what a stock ls1 can do.. Especially not an auto..

You have a good mph, get a set of tires to bring that sixty down and you will be in mid 12s easy.. Add a cutout while you are at it, 30 bucks won't hurt.

You are reading into dyno numbers way too much..

MikeG.

i never said i had a rebuilt motor? it has the stock 170k mile bottom end in it so id rather not. good eye on the rebuild i didnt do though.

Hanns249.

valve springs what your wanting? and 70hp and 80tq? those real numbers just killing the flow?

tnmotown.

is a dyno jet dyno.

ill be cutting it off tonight. it did feel faster when i didnt have that muffler on there but ill strap it back down after i cut it off. it was just so damn loud when it was just straights. i guess id rather just have some better numbers but then again now with my dr's and 4.10s i could probly cut some better times.

i dont much care about dyno numbers either i just like to be the fastest i can. in case i run into someone out there you know

Whoops...sorry, rebuilt heads. Well my compression check recommendation is even more worthwhile if you have a 170k mile bottom end...

haha yea i should but with 170k miles im not sure i even want to know. ill be tearing it down this winter anyway for a full refresh and some other go fast parts.

im still pondering this +70/+80 gain.......im saying bulllllllllllllshhhhhhhhhhhhhhhh... hopefully that was a typo

:jest:!!!!!!!!

That is NOT what a stock ls1 can do.. Especially not an auto...

:huh: My BONE STOCK down to paper air filter ran 13.1 at 108 with a 2.1 60'. Only ran down the track twice while stock two weeks after I bought it, Im sure with more practice it would have ran 12.8x.

There are alot of variables.

The inlet system? Was the TB 100% open?Air filter clean?Stock intake hurts alittle.

Exhaust -says custom Y-pipe,that could be a restriction.The Flowmaster is definitely a restriction.

Was the tranny locked?

everyone is saying the flowmaster is a restriction..yeah i believe so, but not on such a mildly modified car - it has another problem.

have you done a compression test yet? have you gone through the simple things? o2s, maf, tb opening all the way..?

fwiw my wife's 99 m6 ta went 108-109 with a lid and weld in 80 series only. full weight car in central indiana, nothing special. and she was driving...the muffler is not costing him 8 mph.

:huh: My BONE STOCK down to paper air filter ran 13.1 at 108 with a 2.1 60'. Only ran down the track twice while stock two weeks after I bought it, Im sure with more practice it would have ran 12.8x.

fwiw my wife's 99 m6 ta went 108-109 with a lid and weld in 80 series only. full weight car in central indiana, nothing special. and she was driving...the muffler is not costing him 8 mph.

You both are talking about 6 speeds... His mph for an auto shows his car has faster than a 12.9 in it. Who says he should be trapping 115mph?

I forget sometimes everyone runs in the same DA with a VERY strong car and not all setups run the same thing.
I apologize.

You both are talking about 6 speeds... His mph for an auto shows his car has faster than a 12.9 in it. Who says he should be trapping 115mph?he has a cammed car with supporting bolt-ons, why wouldn't he be going 115? also, my 3600lb bolton a4 car trapped 110-111, it was NOT a "strong car" nor was it in a DA below 2000'...ever. it went 14.1 @ 101 bone stock, about 25 passes worth with the paper tags still on it. the ta i am speaking of is a 6 spd, but that doesn't extinguish the fact his car is missing something. that car raced on the same track in the same circumstances as my a4. i don't think it's a stong car by any means.

i am just saying that the muffler is not his problem. those pointing to the muffler are comparing his small cammed ls1 to a built 427 haha.

2 tracks. one in mid indiana in the late evening. other was in michigan outside detroit. during a 90 degree day. not the best conditions. and all on street tires with an unlocked tranny.

these stock guys are saying 13.0s with nothing else. that blows.

and no there isnt anything i havnt checked. tb is open all the way. no ses code or anything in the computer. car runs tip top. and why would i be trapping 115? i now have 410s and dont think i could even trap that speed. im so confused. you guys say the flowmaster, bad tune, to many miles. the car runs strong and alot of guys with built ls cars around here think it runs strong. where are these 13.0 stock cars commin from and why did i do all this work just to get to stock speeds? i studied before i put these things together but i do think a new true dual exhaust setup will help. but idk. i still curious?

You don't need a true dual exhaust... Just a good quality cat-back or just a cutout. They are not exaggerating about the Flow-disaster; the cross-flow Flowmasters are horrible on these cars. I have seen 40-80 HP gains by cutting that muffler off or running a cutout. No BS.


Shane

he has a cammed car with supporting bolt-ons, why wouldn't he be going 115? also, my 3600lb bolton a4 car trapped 110-111, it was NOT a "strong car" nor was it in a DA below 2000'...ever. it went 14.1 @ 101 bone stock, about 25 passes worth with the paper tags still on it. the ta i am speaking of is a 6 spd, but that doesn't extinguish the fact his car is missing something. that car raced on the same track in the same circumstances as my a4. i don't think it's a stong car by any means.

i am just saying that the muffler is not his problem. those pointing to the muffler are comparing his small cammed ls1 to a built 427 haha.

Wtf? Maybe my car ran strong lol. I ran 13.9 @ 102 in Albuquerque bone stock. The DA was somewhere around 7500' Stock 2.73 A4 Stripper

It only made 299 rwhp too

The muffler is surely the majority of his problem. I promise you, you will LOSE HP on a stock LS1 car with that muffler over the stock GM muffler. We learned this way back in 98-99 when these first came out. That muffler could be killing 4-5mph easily in his setup. A cammed car will lose a minimum of 30 hp with a Flowmaster crossflow muffler. I've got many dyno runs to prove it.

Shane

2 tracks. one in mid indiana in the late evening. other was in michigan outside detroit. during a 90 degree day. not the best conditions. and all on street tires with an unlocked tranny.

these stock guys are saying 13.0s with nothing else. that blows.

and no there isnt anything i havnt checked. tb is open all the way. no ses code or anything in the computer. car runs tip top. and why would i be trapping 115? i now have 410s and dont think i could even trap that speed. im so confused. you guys say the flowmaster, bad tune, to many miles. the car runs strong and alot of guys with built ls cars around here think it runs strong. where are these 13.0 stock cars commin from and why did i do all this work just to get to stock speeds? i studied before i put these things together but i do think a new true dual exhaust setup will help. but idk. i still curious?

13.0X and 12s are NOT anywhere NEAR the norm for these cars, don't listen to the "internet" times, you are racing in real life conditions with your car.

My car trapping 117mph in a 2000 DA.. I would consider my car, along with many others, a strong running full weight car. I have a baby 226 cam and ported/milled 317s 4000 converter ls6 intake LTs ORY cutout blah blah blah.. 7.43@91.5mph 1.53 '60 passes on average.. Full weight, driven to the track yada yada yada..
Looking at your 60 ft. you definitely have more in your car, I cut 1.9s stock and the Gf does also.
Adding a cutout and tires I could see mid mid 12s@111mph maybe.. But look at what other a4 cars are doing mph wise with that ET..
By the way, did I miss what kind of converter you are running?

lemons12.

converter is stock. its my dd. im not as worried about the numbers since i can pull on a 6.0 all day long and ive ran another cammed 99 m6 car and he didnt fair as well either. now that was with my stock tires. i now have 4.10s and dr's. so that being said you think its a mid 12 car with no flowmaster and dr's and gears? i would like to do a conveter about a 3600 or bigger and im seeing .5 of a gain on a4 cars with conveter only. it is still a full weight car.

but should i be seeing higher numbers when i put it back on the dyno with my new better flowing and alot better set up exhaust. i think my y pipe is probly hurting me also.

70rwhp? and 80 rwtrq? really? I just don't by that, did you mean 7rwhp and 8 rwtrq?

So don't buy it, just learn a lil. Its actually +70rwhp and +84rwtrq.

http://www.ls1tech.com/forums/dynamometer-results-comparisons/1132747-427-lsx-build-dyno-results-5.html#post12348215

XtraCajunSS

can i see the dyno sheets on the pulls with and also with out the flowmaster. im curious to see what real numbers are before i get to the shop next saturday. then ill be able to give some real numbers with and with out and see what our dyno says.

red 02 camaro

13.9 @102? im not sure what effect the DA is but where im at i had a stock 95Z m6 perfect condition and low miles that was running a 14.0 and idk what speed. idk if thats good for me or bad for you? those 2.73 i can promise you are proly killing you if its stock. geras make a big diff in feeling. i love my 4.10s just not a road trip car anymore. but alot of fun on the street

im still pondering this +70/+80 gain.......im saying bulllllllllllllshhhhhhhhhhhhhhhh... hopefully that was a typo

Nope, LMFAO. Not a typo, the gaymaster really is that baaaad.

I was talking about valve springs, which one are you running?

Hanns249

i buy it. i could tell a huge change when i got my car running. it was no tune with open exhaust out the back. i put that muffler on it and tuned it and im sure the damn thing got slower.

comp 918s. ls7 lifters. chrome moly 7.4" push rods from thunder racing. why are you inquiring about springs?

comp 918s. ls7 lifters. chrome moly 7.4" push rods from thunder racing. why are you inquiring about springs?

I was just curious because you said you had stock rebuilt LS1 heads, so I just wanted to make sure "stock" didn't also include stock springs hahaha. You just never know sometimes. Looks good. It is most likely the flowmaster/stock LS1 heads/LS1 intake thats holding you back a good 50-70rwhp.

haha true. the way i run my car if it had stock springs it would run no longer. i got all the parts i thought would hold together.

haha true. the way i run my car if it had stock springs it would run no longer. i got all the parts i thought would hold together. im gonna look at cutting that off today after work.

So don't buy it, just learn a lil. Its actually +70rwhp and +84rwtrq.

http://www.ls1tech.com/forums/dynamometer-results-comparisons/1132747-427-lsx-build-dyno-results-5.html#post12348215

those sheets right there are enough for me! thats crazy numbers that flowmaster is killin me is what i see

lemons12.

converter is stock. its my dd. im not as worried about the numbers since i can pull on a 6.0 all day long and ive ran another cammed 99 m6 car and he didnt fair as well either. now that was with my stock tires. i now have 4.10s and dr's. so that being said you think its a mid 12 car with no flowmaster and dr's and gears? i would like to do a conveter about a 3600 or bigger and im seeing .5 of a gain on a4 cars with conveter only. it is still a full weight car.

but should i be seeing higher numbers when i put it back on the dyno with my new better flowing and alot better set up exhaust. i think my y pipe is probly hurting me also.

GET A CONVERTER!!!!!!!!!!!!!!!! It will not effect your dyno numbers but if you get a good converter you will see a MINIMUM of .5 on your times, MPH might move up a little too.. Converter and tires and you will be knocking on 11s door, or in it.
I would definitely get a cutout. The Y-pipe with a cutout is not hurting you that much.. You might be leaving a few on the table but the gain would be minimal. You will definitely see higher numbers though, spend the 30$ on a cutout from Jegs/Summit.
C-O-N-V-E-R-T-E-R

i am still curious if you have done a compression test on this engine. perhaps the exhaust could be the majority of his problem, but i find it hard to believe that the muffler flows worse than a stock one. also..without seeing the ypipe it's hard to say. either way, the dyno numbers and trap speed seem to match up.

simply go cut off the muffler and take it down the track, according to these guys you'll easily gain 4 mph.

I know its hard to believe, but its for real...

I know its hard to believe, but its for real...i believe it on a 427, no question. but a stockish 346 isn't going to see much.

XtraCajunSS

can i see the dyno sheets on the pulls with and also with out the flowmaster. im curious to see what real numbers are before i get to the shop next saturday. then ill be able to give some real numbers with and with out and see what our dyno says.

red 02 camaro

13.9 @102? im not sure what effect the DA is but where im at i had a stock 95Z m6 perfect condition and low miles that was running a 14.0 and idk what speed. idk if thats good for me or bad for you? those 2.73 i can promise you are proly killing you if its stock. geras make a big diff in feeling. i love my 4.10s just not a road trip car anymore. but alot of fun on the street

In Albuquerque people usually go about a second slower from sea level. The quickest pass to date in my car is a 12.8 @ 105 with a 1.72 60ft

i believe it on a 427, no question. but a stockish 346 isn't going to see much.

You will be surprised, he will see north of 20 rwhp.

im still pondering this +70/+80 gain.......im saying bulllllllllllllshhhhhhhhhhhhhhhh... hopefully that was a typo

Well the guy that wrote that looks to have 427. I have dynod 39 more horses open cutout over flowmaster so being the sheer more amount of cubes, I dont doubt it. Its crazy but it is a horrible system.