What's this dip in Dyno chart, 3rd pull?
Thread Starter
Melting Slicks
Joined: Jun 2006
Posts: 2,923
Likes: 1
From: Cleveland Tennessee
What's this dip in Dyno chart, 3rd pull?
My first dyno in my life at 40, I have had many vehicles, and this is my forth C4. My wife and I went to the Atlanta Motor Speedway this past weekend for the NOPI Nationals and while we were there and in the show, I paid $80 to have my car dyno'ed. Keep in mind that it had the 383 stroker LT1 build shorty headers , mild cam but is still running the stock factory tune, and with that runs and drives pretty well, I've been told though that I can expect an increase in numbers with a new custom tune since the stoker build, that will be coming soon, but for now it had three pulls here are the pictures and numbers...276.08 HP at wheels, and 315 Torque, I'm hoping that after the tune it should be well over 300 HP... I know not really big number to brag about, but not to bad I thought.
Here is the Horsepower ratings 3 pulls:
Here is the Torque ratings 3 pulls also:
And the air/fuel ratios graph, pretty level for the most part they said:
Here is the Horsepower ratings 3 pulls:
Here is the Torque ratings 3 pulls also:
And the air/fuel ratios graph, pretty level for the most part they said:
Thread Starter
Melting Slicks
Joined: Jun 2006
Posts: 2,923
Likes: 1
From: Cleveland Tennessee
That sounds good, I'm guessing that when I get the custom tune that it should have had after the stroker build was completed that they will probably do that with any other adjustments that are neccesssary, I will mention it to the guy doing the tune and next dyno. Thanks 
Melting Slicks
Joined: Mar 2003
Posts: 2,472
Likes: 0
From: Toronto ONTARIO
Definitely can be leaned out for starters. I hate to be the one saying this, but if you are 100% sure that is a stroker in there, its performing identically.... to a bone stock LT1 6-spd on a dynojet. AT least from what I know. What I really want to say though is that if it is indeed a stroker, you're leaving quite a bit on the table by not having it tuned right. It would freak me out leaving a stock tune and putting a $$$ built 383 on a dyno and running it at WOT.
Nice car though
Nice car though
Thread Starter
Melting Slicks
Joined: Jun 2006
Posts: 2,923
Likes: 1
From: Cleveland Tennessee
The owner and guys running the dyno at the track said that stock similiar yeared LT1's were usually around 225-235 HP at the wheels from what he had seen, so I was using that as sort of a guage too? I bought this Vette a few months ago with the "Stroker" build done with the reciepts. It's been about 3000 miles now since the build and I am for sure going to get a custom tune done, hopefully this week if they can fit the Vette in. But are those numbers really what a 'stock' 94 LT1 gets? and how much should I expect to gain in HP and tQ with the 'right' proper tune to match the "stroker" build, check out this link to a custom page that I made on my site for this car with a listing of the parts and work done to this engine and see what you think about the performance it should have then when all is retuned:
http://www.fastcoolcars.com/1994-corvette-6spd.htm
The parts and work done are lower down on that page, it is loaded with about 90 pictures too
but the text should come right up about instant. Thanks.
http://www.fastcoolcars.com/1994-corvette-6spd.htm
The parts and work done are lower down on that page, it is loaded with about 90 pictures too
but the text should come right up about instant. Thanks.
Thread Starter
Melting Slicks
Joined: Jun 2006
Posts: 2,923
Likes: 1
From: Cleveland Tennessee
Hmmm....all of this is making me a little suspicious about what it is that I bought exactly, even though I did get a folder full of reciepts 
I've got a quote for a $400 intial custom tune rate/fee with that first dyno time will also included, all retunes done by that guy after are free when dyno time is bought at that same time. I guess I'll be spending another $400 this week to find out how much more I can get out of this "Stroker" hmmm
I've got a quote for a $400 intial custom tune rate/fee with that first dyno time will also included, all retunes done by that guy after are free when dyno time is bought at that same time. I guess I'll be spending another $400 this week to find out how much more I can get out of this "Stroker" hmmm
Last edited by RonVette2; Sep 19, 2006 at 12:30 AM.
Drifting
Joined: Mar 2004
Posts: 1,522
Likes: 0
Originally Posted by ALLT4
I'm not even sure with the stock cam your numbers would be that low with a 383. Somethings wrong there, a tune won't net you another 100RWHP like it should have.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Melting Slicks
Joined: Mar 2003
Posts: 2,472
Likes: 0
From: Toronto ONTARIO
Every dyno is different. Perhaps that dyno has a more accurate load system or just has more resistance etc. too many variables that come into play. If they're saying stock LT1s have put out 230 , you definitely are running in the ballpark for a mild stroker and perhaps the stock ecu is doing a great job. I'm going to guess by asking if its a 94 because it has the older side fenders and if so the MAF certainly helps the ecu know that its drawing in more air and is more able to adapt than a speed density setup.
To help put things in perspective for you with regards to the point I was trying to get across, on the same dyno I had my car tuned at, a new 06 z06 put down 418 rwhp the day before I went. There's the regular post of stock z06s in the c6z section of them putting down 488 rwhp. go figure.
My first suggestion would be to find another dyno. verify the type that it is etc and the settings (weight, correction factor etc), and go for another pull. Reason being as others have also hinted, your numbers look smack dead on for a bone stock LT1 6 spd on a dynojet.
To help put things in perspective for you with regards to the point I was trying to get across, on the same dyno I had my car tuned at, a new 06 z06 put down 418 rwhp the day before I went. There's the regular post of stock z06s in the c6z section of them putting down 488 rwhp. go figure.
My first suggestion would be to find another dyno. verify the type that it is etc and the settings (weight, correction factor etc), and go for another pull. Reason being as others have also hinted, your numbers look smack dead on for a bone stock LT1 6 spd on a dynojet.
Last edited by DieL; Sep 19, 2006 at 12:33 AM.
Melting Slicks
Joined: Dec 2004
Posts: 2,137
Likes: 5
From: Howard PA
Does you car have any lope at idle? I mean does it sound like it has a cam with some guts to it?
My buddy just had his '95 383 dynoed and made 365RWHP with a mild CC503 cam through the stock exhaust minus mufflers, stock heads (very minor porting) I don't remember the torque numbers but it was up there with the HP number as it should be.
I can't see a dyno being off almost 100HP.
My buddy just had his '95 383 dynoed and made 365RWHP with a mild CC503 cam through the stock exhaust minus mufflers, stock heads (very minor porting) I don't remember the torque numbers but it was up there with the HP number as it should be.
I can't see a dyno being off almost 100HP.
Last edited by ALLT4; Sep 19, 2006 at 01:08 AM.
Melting Slicks
Joined: Mar 2003
Posts: 2,472
Likes: 0
From: Toronto ONTARIO
Not sure if this link will work. But I just googled dyno-go mobile dynamometers to try and get an idea on settings/load etc that they use. I did find this pic of a stock 94 auto.
http://www.dyno-go.com/modules.php?o...howpic&pid=183
awfully similar #s to your car.
http://www.dyno-go.com/modules.php?o...howpic&pid=183
awfully similar #s to your car.
Thread Starter
Melting Slicks
Joined: Jun 2006
Posts: 2,923
Likes: 1
From: Cleveland Tennessee
No lope in idle, very conservative cam, sounds almost stock in idle, the vette has cat back Corsa and shorty hooker headers (I've heard the short headers do basically nothing compared to the long tube.) I was expecting a bigger number, what can I expect out of a good tune then? do you think I have what I was told I had?
Melting Slicks
Joined: Mar 2003
Posts: 2,472
Likes: 0
From: Toronto ONTARIO
based on the #s alone, you have what appears to be a stock LT1 with short tubes and corsas. As for a tune, if it is indeed a stroker there may be much more in it. If it isn't, there isnt because most stock Lt1 cars are very close to that #.
Only thing that has me going is that they told you most other stock LT1s are around 225-230. If that is in fact true than THAT dyno may be putting much more load than it should or just may not be calibrated properly.
Only thing that has me going is that they told you most other stock LT1s are around 225-230. If that is in fact true than THAT dyno may be putting much more load than it should or just may not be calibrated properly.
Thread Starter
Melting Slicks
Joined: Jun 2006
Posts: 2,923
Likes: 1
From: Cleveland Tennessee
Yeah I guess after seeing that 95 model an the same dyno as I was on that it would appear that they are almost about the same within 1 HP actually, although it does'nt say if his is stock, but I would guess that it was. hmmm
What is the amount that one should expect to loose from a factory rated 300HP LT1 compared to crank to RWHP? I thought it would be more then 23-24 HP.
What is the amount that one should expect to loose from a factory rated 300HP LT1 compared to crank to RWHP? I thought it would be more then 23-24 HP.
Melting Slicks
Joined: Dec 2004
Posts: 2,137
Likes: 5
From: Howard PA
You might be able to tell if this is a stroker or not by looking at the oil pan, if it's stock you should see a few bumps beat out from inside the pan near the front. The front two rod big ends almost always have to be clearanced in that area.
This unless they ground the rod bolts to clear, something I'd never recommend doing.
This unless they ground the rod bolts to clear, something I'd never recommend doing.