Is there anyway that Longtubes would...
Is there anyway that Longtubes would... Well I have been contemplating about getting longtubes for a while now and I was just woundering about something, with my mods in my sig I made 322rwhp and 345rwtq and I would assume that after the installation of longtubes my car should make about 340rwhp and lets say 355rwtq. I was just curious if there is anyway that I would not gain anything by getting a set of longtubes or not gain that much or maybe even lose some hp or tq by getting longtubes. I have seen some peoples dyno numbers with LTs in there sigs and alot of them say like 328- or 335hp and like 347tq where as my car stock has about that. So what do you all think? 
longtubes will not hurt performance. The internal combustion engine was designed as a compressor. The more air/fuel mixture you can get into and out of an engine the more power it will make. Do a search on the internet for exhaust scavenging and you'll understand. Go to howthingswork.com and look up engine. then you will get a grasp on how an engine works and makes power.
Nate
Nate
My numbers were 320hp and 334tq before headers/catted-Y. After they were 343hp and 357tq (tuned), and I probably would have made a few more hp/tq across the powerband had we taken the time to let the car cool off between pulls.
The only way you would see no gains or even lose power would be if your tuning and A/F were thrown off by so much that it really messed things up but this isn't common.
Another culprit is breaking a spark plug without knowing it and/or leaving a plug wire boot off or something.
Get the headers though, you won't regret it.
QTPs are a great choice. www.quicktimeperformance.com
Another culprit is breaking a spark plug without knowing it and/or leaving a plug wire boot off or something.
Get the headers though, you won't regret it.
QTPs are a great choice. www.quicktimeperformance.com
With no tuning, my car with LTs made 340/356, and it runs a hell of a lot stronger than it ever did with manifolds. Dyno numbers don't mean anything anyways...they are more of a tuning tool.
My car a 2001 trans am ws6 without headers dynoed 344HP and 352TQ
When i went out a bought Kooks headers 1 3/4 and Kooks y-pipe (catLESS) w/ O2 Simulators I gained 12HP and 23TQ
Putting me at 356HP and 375TQ
If ya got any questions or want pictures I have them
When i went out a bought Kooks headers 1 3/4 and Kooks y-pipe (catLESS) w/ O2 Simulators I gained 12HP and 23TQ
Putting me at 356HP and 375TQ
If ya got any questions or want pictures I have them
Originally Posted by ZL1Killa
My car a 2001 trans am ws6 without headers dynoed 344HP and 352TQ
When i went out a bought Kooks headers 1 3/4 and Kooks y-pipe (catLESS) w/ O2 Simulators I gained 12HP and 23TQ
Putting me at 356HP and 375TQ
If ya got any questions or want pictures I have them
When i went out a bought Kooks headers 1 3/4 and Kooks y-pipe (catLESS) w/ O2 Simulators I gained 12HP and 23TQ
Putting me at 356HP and 375TQ
If ya got any questions or want pictures I have them
Have you run yours at the track? I'd be curious to see your trap speed in the 1/4. Mine has never done great with this lovely southern humidity.
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Thanks for your imput everyone, in a few weeks when I save up some money I will probably order some. From what I read it seems like everyone either goes with QTPs or Kooks, so I will look for a set of them. Is it worth is to buy the HVM (high velocity merge collectors) QTPs or are the regular ones ok? Do the HVMs make the header flow that much better?
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Originally Posted by ZL1Killa
My car a 2001 trans am ws6 without headers dynoed 344HP and 352TQ
When i went out a bought Kooks headers 1 3/4 and Kooks y-pipe (catLESS) w/ O2 Simulators I gained 12HP and 23TQ
Putting me at 356HP and 375TQ
If ya got any questions or want pictures I have them
When i went out a bought Kooks headers 1 3/4 and Kooks y-pipe (catLESS) w/ O2 Simulators I gained 12HP and 23TQ
Putting me at 356HP and 375TQ
If ya got any questions or want pictures I have them
Those are freakish numbers without headers. Very nice.
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From: The other, other, other A-Town, NM
Originally Posted by NBM2k2SS
Thanks for your imput everyone, in a few weeks when I save up some money I will probably order some. From what I read it seems like everyone either goes with QTPs or Kooks, so I will look for a set of them. Is it worth is to buy the HVM (high velocity merge collectors) QTPs or are the regular ones ok? Do the HVMs make the header flow that much better?
TECH Fanatic
Joined: Nov 2003
Posts: 1,241
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From: MD
If you have a decent speed shop in your area you might also want to get it tuned. It can make a big difference. I'm guessing I gained about 20 hp/torque from the tune after the header and exhaust install.
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Joined: Apr 2003
Posts: 446
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From: Lexington, KY
My stock PCM handled the headers perfectly. I talked with my tuner after he looked at my dyno graph and a/f charts and he said there was only about 5hp/6tq to be had throughout the rpm range with tuning. I put down the numbers in my sig with the following HP mods:
MTI Clear Lid
K&N Filter (was filthy at the time and needed recharged)
Hooker Long Tubes
TSP True Duals
Stock Slipping Clutch
I have pics of the graph up in the dynograph section if anyone is interested.
MTI Clear Lid
K&N Filter (was filthy at the time and needed recharged)
Hooker Long Tubes
TSP True Duals
Stock Slipping Clutch
I have pics of the graph up in the dynograph section if anyone is interested.
Sounds good, well i guess Ill be looking for some regular QTPs in a month or so when I get some money saved up. Also is a tune really nessesary for LTs? And I came across a shaner TB the other day, what do you all think of thoes? Is it worth it?
Are those nubers SAE corrected?
Originally Posted by LS1Maniac
My stock PCM handled the headers perfectly. I talked with my tuner after he looked at my dyno graph and a/f charts and he said there was only about 5hp/6tq to be had throughout the rpm range with tuning. I put down the numbers in my sig with the following HP mods:
MTI Clear Lid
K&N Filter (was filthy at the time and needed recharged)
Hooker Long Tubes
TSP True Duals
Stock Slipping Clutch
I have pics of the graph up in the dynograph section if anyone is interested.
MTI Clear Lid
K&N Filter (was filthy at the time and needed recharged)
Hooker Long Tubes
TSP True Duals
Stock Slipping Clutch
I have pics of the graph up in the dynograph section if anyone is interested.
TECH Regular
Joined: Apr 2003
Posts: 446
Likes: 0
From: Lexington, KY
Originally Posted by NBM2k2SS
Sounds good, well i guess Ill be looking for some regular QTPs in a month or so when I get some money saved up. Also is a tune really nessesary for LTs? And I came across a shaner TB the other day, what do you all think of thoes? Is it worth it?
Are those nubers SAE corrected?
Are those nubers SAE corrected?
Here's the STP corrected graph.
https://ls1tech.com/forums/dynamometer-results-comparisons/234979-bolt-ons-dyno-graph.html
Last edited by LS1Maniac; Jan 14, 2005 at 07:38 PM.
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Joined: Jan 2003
Posts: 451
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From: Alabamastan
I dynoed 344.x rwhp and 351.x rwtq with a filthy air filter and a day with 100% humity and the dew point at 100% with the mods in my sig. TQ curve was pretty flat above 3000 rpm. Hope that helps. Dyno tune by Billy Lawler.
Originally Posted by NBM2k2SS
Is it worth is to buy the HVM (high velocity merge collectors) QTPs or are the regular ones ok? Do the HVMs make the header flow that much better?
