Dissapointing Dyno... Please Help
Melting Slicks
Joined: Feb 2003
Posts: 2,966
Likes: 22
From: Frederick Maryland
St. Jude Donor '08-'09-'10-'11
Like everybody stated dyno #'s aren't everything. Here is where I started.
Base 299RWHP
1) Just Stage I heads/MTI B1 cam (221/221 .558/.558 114) flow 271/211 @ .600 354RWHP
2) Blackwing/LS6 intake/Borla Stingers/Tune 374RWHP
3) High flow air bridge/SVO 30#/Kooks/high flow cats/Dyno tune 392RWHP
Base 299RWHP
1) Just Stage I heads/MTI B1 cam (221/221 .558/.558 114) flow 271/211 @ .600 354RWHP
2) Blackwing/LS6 intake/Borla Stingers/Tune 374RWHP
3) High flow air bridge/SVO 30#/Kooks/high flow cats/Dyno tune 392RWHP
Thread Starter
Racer
Joined: May 2003
Posts: 306
Likes: 1
From: Austin TX
Alright here we go. The heads are not milled and i did not check the quench. I just used the graphite head gaskets that MTI sent with the package. I have since been told I should have used the thinner gaskets.
I thought that 325/330 was pretty good on a 99 ls1. You have to remember that all 2001+ cars had the ls6 intake or else I would have been around 340-350 rwhp. I thought the baseline was great.
I guess it could be the injectors but i thought they were good for around 450 rwhp? Correct me if i am wrong.
I do not think the cam is the problem. I like the way it is designed and many other people use it. I find it odd that so many people are confused about the reverse split when this thing has been around forever. I am starting to think the heads are not all that great, but i definetly got an awesome power gain for the price I paid.
The more I think about it the happier I get with the car. Now i need to get a clutch so that I can launch it hard enough to get some solid times.
Thanks for all of the responses and the comforting. I know I will be happy for a while now that she spins to 6700 rpm
I thought that 325/330 was pretty good on a 99 ls1. You have to remember that all 2001+ cars had the ls6 intake or else I would have been around 340-350 rwhp. I thought the baseline was great.
I guess it could be the injectors but i thought they were good for around 450 rwhp? Correct me if i am wrong.
I do not think the cam is the problem. I like the way it is designed and many other people use it. I find it odd that so many people are confused about the reverse split when this thing has been around forever. I am starting to think the heads are not all that great, but i definetly got an awesome power gain for the price I paid.
The more I think about it the happier I get with the car. Now i need to get a clutch so that I can launch it hard enough to get some solid times.
Thanks for all of the responses and the comforting. I know I will be happy for a while now that she spins to 6700 rpm
Drifting
Joined: Jul 2002
Posts: 1,484
Likes: 0
From: Morgan Hill Ca.
with everything above. What I would do next is go get some good scanner and wide band SW and do some highway and strip runs and see what she is doing really. A good check of AFR and you will see your timing and fuel tables intake parameters etc.
Safety Car
Joined: Oct 2000
Posts: 4,949
Likes: 10
From: Monticello MN
[QUOTEI guess it could be the injectors but i thought they were good for around 450 rwhp? Correct me if i am wrong. [/QUOTE]
I believe that both the 1999 and 2000 C5 LS1s had 26lb injectors. Check with Jason at Texas Speed and Performance for an unbelievable price on a set of brand-new GM (Bosch) 28.8lb injectors already mounted on a fuel rail. I believe these larger injectors were standard equipment on all 2001-2004 C5s and Z06s.
Here's the link: http://www.texas-speed.com/
Jason's number is 806-866-0734.
Good luck!
Ed
I believe that both the 1999 and 2000 C5 LS1s had 26lb injectors. Check with Jason at Texas Speed and Performance for an unbelievable price on a set of brand-new GM (Bosch) 28.8lb injectors already mounted on a fuel rail. I believe these larger injectors were standard equipment on all 2001-2004 C5s and Z06s.
Here's the link: http://www.texas-speed.com/
Jason's number is 806-866-0734.
Good luck!
Ed
Last edited by C5XTASY; Jan 12, 2005 at 05:47 PM.
Team Owner
Joined: Jul 2003
Posts: 20,474
Likes: 2
From: Detroit
Originally Posted by Face
I only dynoed 388rwhp and ran 11.11 @ 121, so don't feel so bad.
Mark
Safety Car
Joined: Oct 2000
Posts: 4,949
Likes: 10
From: Monticello MN
Originally Posted by NavyBlue99
would 28# injectors really make that much of a difference at all?
Ed
Safety Car
Joined: Sep 2003
Posts: 3,558
Likes: 2
From: Cape Coral FL
I guess it could be the injectors but i thought they were good for around 450 rwhp? Correct me if i am wrong.
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Le Mans Master
Joined: Jun 2004
Posts: 7,155
Likes: 154
From: The Arid Sunny Desert
The Vette Doctors told me that my stock injectors are working fine and I should only change them if I want to waste $$$. They told me that I wouldn't gain a thing. If the engine isn't starving for fuel there is no reason to change. At 405 RWHP and 385 RWTQ I'm not complaining.
Race Director
Joined: Mar 2004
Posts: 12,634
Likes: 15
From: IL, Chicago area.
St. Jude Donor '14-'15-'16
When I did my H/C package I was wanting to hit 400rwhp SAE corrected or get very close, when I ended up at 413 I was thrilled.
I have a pretty small cam and my LS6 heads were massaged to about the equal of the MTI ones you got. I did however go to the 28# injectors just to avoid any future problems. I know if I want any more power I'm really going to need a bigger cam.
I do plan on going to a Z06 MAF and throttle body and I'm really hoping I gain a little there but I bet its not all that much. I would be very happy if I could just hit 420rwhp SAE corrected.
That and 3.90's anyway !!
I have a pretty small cam and my LS6 heads were massaged to about the equal of the MTI ones you got. I did however go to the 28# injectors just to avoid any future problems. I know if I want any more power I'm really going to need a bigger cam.
I do plan on going to a Z06 MAF and throttle body and I'm really hoping I gain a little there but I bet its not all that much. I would be very happy if I could just hit 420rwhp SAE corrected.
That and 3.90's anyway !!
Drifting
Joined: Oct 2002
Posts: 1,335
Likes: 76
From: Bedford Va.
verify the injector cycle duty and you will know if they are adequate.
it would be nice to see your dyno run posted.
if you have it where does the hp curve start to drop off?
is the line jumpy at the upper RPM?
it would be nice to see your dyno run posted.
if you have it where does the hp curve start to drop off?
is the line jumpy at the upper RPM?
Thread Starter
Racer
Joined: May 2003
Posts: 306
Likes: 1
From: Austin TX
I have the dyno graph but no way to get it on the forum at the moment. The torque curve is pretty flat and the horsepower graph is smooth. The curve peaks around 6500 and there are no signs of problems. AFR is almost solid @ 12.8
Another thing I forgot to mention... Andy @ 21MC was able to add 31 degrees of timing and still had NO knock or detonation. That led us to believe that the compression was low. We only did a leak down test as I said above and everything came out alright. How did we get that much timing into it and not knock?
Another thing I forgot to mention... Andy @ 21MC was able to add 31 degrees of timing and still had NO knock or detonation. That led us to believe that the compression was low. We only did a leak down test as I said above and everything came out alright. How did we get that much timing into it and not knock?
Drifting
Joined: Oct 2002
Posts: 1,335
Likes: 76
From: Bedford Va.
the only item I see then is the compression.
I installed stage 2 ls6 heads on my car and I requested no milling(they were new blanks).
my tuner said I gave up some HP by not bumping the compession up to
11 or 11.5
I installed stage 2 ls6 heads on my car and I requested no milling(they were new blanks).
my tuner said I gave up some HP by not bumping the compession up to
11 or 11.5
Drifting
Joined: Sep 2000
Posts: 1,349
Likes: 0
From: Seattle WA
I have the X1 cam, stage II heads, headers, fast 78 intake and am putting down 402 rwhp 368 ftlbs of tq. So you are not too far off. I felt like you tho, and thought I would put down close to 420. I have some tweaking left to do, but it still does kicks ***.
Now I need a clutch, more than more power!
Now I need a clutch, more than more power!
Pro
Joined: May 2003
Posts: 680
Likes: 1
From: Detroit mi
Originally Posted by NavyBlue99
The 21MC guys did everything to try and make me happier with dyno tricks and all but nothing. 
That implies they were going to play with something on the dyno to get it to give a false high reading so you could have a good chart? Or am i reading that wrong?
Thread Starter
Racer
Joined: May 2003
Posts: 306
Likes: 1
From: Austin TX
Originally Posted by Icetech
Did they actually tell you they were going to use "Dyno tricks"?
That implies they were going to play with something on the dyno to get it to give a false high reading so you could have a good chart? Or am i reading that wrong?
That implies they were going to play with something on the dyno to get it to give a false high reading so you could have a good chart? Or am i reading that wrong?