Night @ the Dyno!

[paxton350]

decided to get my new setup dynoed. if you can notice on the dyno sheet, it appears the pcm is pulling timing around 4k-4500 rpm which is holding some power back. i believe its the lt1 knock module. i just ordered an lt4. had alot of fun... never been on a dyno before, i wish i had one of these things in my garage!

-chris

run links:

http://www.putfile.com/media.php?n=run189
http://www.putfile.com/media.php?n=run268
http://www.putfile.com/media.php?n=run376
http://www.putfile.com/media.php?n=run431
http://www.putfile.com/media.php?n=run5

dyno sheet:
http://putfile.com/pic.php?pic=8/21814243672.jpg&s=x1

[Jay 02 TA ws6]

Don't take this the wrong way... but those numbers seem abnormally low...

I'm sure the timing has something to do with it... but damn... for a DynoJet, that seems really really low for a blown car.

[paxton350]

well the motor is also 11 years old w/ 90k on it. it does need some tuning thats for sure lol. was thinking about swapping a newer built ls1 motor w/ the blower in there over the winter but well see how the $ situation goes.

[raroZ28]

Don't take this the wrong way... but those numbers seem abnormally low...

I'm sure the timing has something to do with it... but damn... for a DynoJet, that seems really really low for a blown car.

Jay he's only running 7 psi, that's not that much boost. he also has a cf df clutch which was probably slipping. Aside from the s/c, his car isn't modified all that much. I'd say 350/380 at the wheels is pretty impressive, and pretty normal.

[Nightrage]

Not to hijack the thread or whine like a little girl or anything, but this is what depresses me about my car. Jay's 02 WS6 with only bolt ons had the same RWHP as Paxton350's supercharged LT1. I guess it doesn't all necessarily come down to horsepower though, right? Joe's bolt ons wouldn't even bring the car to 300RWHP, would it? He still managed to run a 13 flat. I'd still like to be making some decent numbers, though.

*EDIT* I just saw that he has Flowmasters like me. Could that be preventing him from making more power?

[fastTa]

349 RWHP is extremely low on an LT1 if you are truly getting 7 PSI at the manifold. You are getting boost blowby into the crankcase, or your intake temps are astronomically hot, and/or you are having timing/fuel issues. Something is very wrong. I suspect you are not getting all of the boost into the cylinder. Possible due to tired rings, and/or valve seals/guides. Do you have a intake manifold boost gauge? Have you ever measured the crankcase pressure? Do you have a crankcase evacuation line running from the head unit?

[paxton350]

349 RWHP is extremely low on an LT1 if you are truly getting 7 PSI at the manifold. You are getting boost blowby into the crankcase, or your intake temps are astronomically hot, and/or you are having timing/fuel issues. Something is very wrong. I suspect you are not getting all of the boost into the cylinder. Do you have a intake manifold boost gauge? Have you ever measured the crankcase pressure? Do you have a crankcase evacuation line running from the head unit?

no i havnt measured crankcase pressure, only compression 2 seasons ago which was all within 10%. i do not have an intake manifold boost gauge, well i used to but am ordering a new one due to the low amt of boost , the universal turbo one i had before was not accurate at all... no i havnt measured crankcase pressure... i know i have a timing issue, however my air fuel ration is dead n if you look at the dyno sheet... and that is new to me a "crankcase evacuation line" i do not have one...

[raroZ28]

Not to hijack the thread or whine like a little girl or anything, but this is what depresses me about my car. Jay's 02 WS6 with only bolt ons had the same RWHP as Paxton350's supercharged LT1. I guess it doesn't all necessarily come down to horsepower though, right? Joe's bolt ons wouldn't even bring the car to 300RWHP, would it? He still managed to run a 13 flat. I'd still like to be making some decent numbers, though.

*EDIT* I just saw that he has Flowmasters like me. Could that be preventing him from making more power?

you are very confused dude. Do a head/cam combo and see how depressed you are. They make tons of power, it's just got bad heads.

I don't know what kind of car you are wanting to get that's gonna see huge gains from minor bolt-ons.

[fastTa]

no i havnt measured crankcase pressure, only compression 2 seasons ago which was all within 10%. i do not have an intake manifold boost gauge, well i used to but am ordering a new one due to the low amt of boost , the universal turbo one i had before was not accurate at all... no i havnt measured crankcase pressure... i know i have a timing issue, however my air fuel ration is dead n if you look at the dyno sheet... and that is new to me a "crankcase evacuation line" i do not have one...

The crankcase evac line is basically a vacuum line that runs from the inlet side of the head unit to the valve cover. It helps to eliminate crankcase pressure...especially if you are experiencing boost blowby.

If you are still using the OEM type PCV valve, you need to make sure that the check valve is functioning properly. You should also look for signs of belt slippage (black powder), and make sure your head unit bracket is tight and not moving around. It doesn't take much movement at all of the bracket to create significant belt slip.

[paxton350]

The crankcase evac line is basically a vacuum line that runs from the inlet side of the head unit to the valve cover. It helps to eliminate crankcase pressure...especially if you are experiencing boost blowby.

If you are still using the OEM type PCV valve, you need to make sure that the check valve is functioning properly. You should also look for signs of belt slippage (black powder), and make sure your head unit bracket is tight and not moving around. It doesn't take much movement at all of the bracket to create significant belt slip.

im sorry head unit your talking about?

[Nightrage]

you are very confused dude. Do a head/cam combo and see how depressed you are. They make tons of power, it's just got bad heads.

I don't know what kind of car you are wanting to get that's gonna see huge gains from minor bolt-ons.

You misenterpreted it, probably my fault. I meant that i can't imagine slapping a supercharger on my car and only putting out as much power as an LS1 with bolt ons. By the bolt ons comments, i meant that having more horsepower doesn't necessarily mean that you're faster. Reassuring myself in a way. LS1's are said to dyno close to 300 horsepower bone stock. They're also said to run mid 13's (13.5- 13.6-ish from what i've heard). Joe's car has less than 300 horsepower yet ran a 13 flat. He has the faster car, even if he doesn't make as much power. I never said that i wanted huge gains from bolt ons. I'd would like to be making at least 300 horsepower to the wheels but that's not happening any time soon. Even if high horsepower doesn't mean everything, it's still nice to have (for bragging rights if nothing else). I figured that a supercharged LT1 would blow an LS1 out of the water as far as numbers go, however they were very similar. Thanks for pointing out my mistake though. A lot of the time something will sound right in my mind, yet make no sense to anyone else. If you have any other questions, please bring them to my attention.

[94 formula]

Not to hijack the thread or whine like a little girl or anything, but this is what depresses me about my car. Jay's 02 WS6 with only bolt ons had the same RWHP as Paxton350's supercharged LT1. I guess it doesn't all necessarily come down to horsepower though, right? Joe's bolt ons wouldn't even bring the car to 300RWHP, would it? He still managed to run a 13 flat. I'd still like to be making some decent numbers, though.

*EDIT* I just saw that he has Flowmasters like me. Could that be preventing him from making more power?

I think dynos are good for having a car tuned and it is nice to have a high horsepower number but each dyno can be very different. Put Jay's and Paxton350's car on the same dyno and there may be a big hp difference. I'd wait and see what times and especially what trap speed he puts down at the track before jumping to any conclusions.

[fastTa]

im sorry head unit your talking about?

The supercharger itself is referred to as the head unit. Not to be confused with the radio in your dash.

[Craig 94 TA GT]

You misenterpreted it, probably my fault. I meant that i can't imagine slapping a supercharger on my car and only putting out as much power as an LS1 with bolt ons. By the bolt ons comments, i meant that having more horsepower doesn't necessarily mean that you're faster. Reassuring myself in a way. LS1's are said to dyno close to 300 horsepower bone stock. They're also said to run mid 13's (13.5- 13.6-ish from what i've heard). Joe's car has less than 300 horsepower yet ran a 13 flat. He has the faster car, even if he doesn't make as much power. I never said that i wanted huge gains from bolt ons. I'd would like to be making at least 300 horsepower to the wheels but that's not happening any time soon. Even if high horsepower doesn't mean everything, it's still nice to have (for bragging rights if nothing else). I figured that a supercharged LT1 would blow an LS1 out of the water as far as numbers go, however they were very similar. Thanks for pointing out my mistake though. A lot of the time something will sound right in my mind, yet make no sense to anyone else. If you have any other questions, please bring them to my attention.

How do you know Joe's car is making less than 300 RWHP? I've never seen dyno #s of his T/A I thought 108 mph trap speed would be in excess of 300 RWHP.
By the way, take a look at this thread: http://www.f-body.com/forum/showthread.php?t=10433 302 RWHP and his main mods at the time were CAI, catback, and custom tune.

[Jay 02 TA ws6]

I think dynos are good for having a car tuned and it is nice to have a high horsepower number but each dyno can be very different. Put Jay's and Paxton350's car on the same dyno and there may be a big hp difference. I'd wait and see what times and especially what trap speed he puts down at the track before jumping to any conclusions.

DynoJet to DynoJet is pretty consistent... some variance, sure... but we're talking about 100-120 HP missing here.

An LS1 pushing 7 psi is going to dyno 450-500 rwhp... I would expect at least 400-450 out of the LT1.