Wanting more low end and throttle response
Thread Starter
Launching!
Joined: Dec 2001
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From: Salem, NH
Wanting more low end and throttle response I have Hooker LT's with a 3" y and no cats, and I have 4.10's, my car has decent low end power (under 3K) but I want a stiffer feel to the gas pedal and more throttle response. Will some high flow cats do this? It seems that when ever you remove the cats it "feels" slower on the bottom end, I know that on the dyno or at the track off raod pipes shine, but as far as SOTP, will cats help give me back that low end response I had with the stock exhaust? Any experiences?
Re: Wanting more low end and throttle response You could always change the T/B cam that's attached to the throttle cable. I know in the 60's Pontiac had a faster cam than Chevy had. I don't know if this is still the case, but it you have chevy you could always try.
I don't think that the Cat's are going to do it for you.
BTW do you have a aftermarket cam? or heads?
If you don't have heads adding some compression ratio could help you.
Bret
I don't think that the Cat's are going to do it for you.
BTW do you have a aftermarket cam? or heads?
If you don't have heads adding some compression ratio could help you.
Bret
Re: Wanting more low end and throttle response Cats won't do it. If you were to dyno your car before and after cats (on a properly sized exhaust setup) there would be gains across the board without them. Sometimes this louder setup makes it "feel" like the car is working harder to accomplish the same thing, but don't mistake exhaust loudness for responsiveness.
You want more low end? Simple, get more cubes! These cars should come from the factory with a 382ci haha.
Tony
You want more low end? Simple, get more cubes! These cars should come from the factory with a 382ci haha.
Tony
Thread Starter
Launching!
Joined: Dec 2001
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From: Salem, NH
Re: Wanting more low end and throttle response I have the TR 224 cam on stock heads, I think the 3" y pipe with no cats is a little overkill for stock heads, so I figured that cats would give a little more back compression which is not good for the track but good for the street. Has anyone added or removed there cats and noticed a difference?
Re: Wanting more low end and throttle response I would agree that a 3" Y is overkill for 346ci
is there still a single 3" catback behind it? Then that should reduce it enough.
Tony
is there still a single 3" catback behind it? Then that should reduce it enough.
Tony
Thread Starter
Launching!
Joined: Dec 2001
Posts: 204
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From: Salem, NH
Re: Wanting more low end and throttle response I have the Hooker catback hooked onto my y pipe, the top end is great but I have to sink into the gas peddle a lot to get that snappy feeling, the peddle is real "mushy" under part throttle, from past experience, no cats have always seemed to kill the low end? I guess it is gonna have to be trial and error <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
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From: ft worth tx
Re: Wanting more low end and throttle response I know exactly what you are talking about. I had the same problem with my macs and offroad y. I went back to stock manifolds and y with cats, got more torque out of it like that. I would say add some high flow cats. Otherwise I have no clue.
TTT <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" />
TTT <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" />
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Re: Wanting more low end and throttle response </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by SStrokerAce:
<strong>You could always change the T/B cam that's attached to the throttle cable. I know in the 60's Pontiac had a faster cam than Chevy had. I don't know if this is still the case, but it you have chevy you could always try. Bret</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Interesting... Anyone ever tried this?
<strong>You could always change the T/B cam that's attached to the throttle cable. I know in the 60's Pontiac had a faster cam than Chevy had. I don't know if this is still the case, but it you have chevy you could always try. Bret</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Interesting... Anyone ever tried this?
TECH Resident
Joined: Nov 2001
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From: Chicago, IL
Re: Wanting more low end and throttle response I don't understand out those TPS trickers can work. They tell the PCM that you have the throttle open more than it is right? So the PCM adds fuel but the throttle isn't letting the equivalent amount of air in so wouldn't you run rich?
Joined: Nov 2001
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From: Schiller Park, ILL Member: #317
Re: Wanting more low end and throttle response Want more low end throttle response? Why don’t you try a set of ignorant 4.71 gears? <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
Thread Starter
Launching!
Joined: Dec 2001
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From: Salem, NH
Re: Wanting more low end and throttle response It seemed logical to me that cats would give more low end response since with open headers, it has absolutely no low end, with no catback and just a y pipe, the low end was better, but not nearly as much as with the catback, see what I am saying, so with cats, with some back pressure up near the motor, it seemed to me that I would pick up low end power <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
TECH Resident
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From: dallas,tx.
Re: Wanting more low end and throttle response what type of intake do you have? longer intake runners are reported to produce more low end torque, but give some of it back at higher rpm's. that seems to be the biggest difference between the ls1 & ls6 intake manifolds.
Re: Wanting more low end and throttle response Brendon,
If you're not already doing something like this, one thing that will give you better throttle response is running Lterms that are slightly positive - up to maybe 10% as measured with AutoTap. This will reduce your calculated load factor and therefore crank in a bit more timing at part throttle. As long as you don't get any knock it should (and this is the best way I can describe it <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> ) make the car feel lighter and a bit more responsive. I've done this with a MAFT/MAF ends, etc. LS1Edit may be even better for this type of work, but unfortunately I don't have any experience with it yet <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
Anyway, just a thought.
If you're not already doing something like this, one thing that will give you better throttle response is running Lterms that are slightly positive - up to maybe 10% as measured with AutoTap. This will reduce your calculated load factor and therefore crank in a bit more timing at part throttle. As long as you don't get any knock it should (and this is the best way I can describe it <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> ) make the car feel lighter and a bit more responsive. I've done this with a MAFT/MAF ends, etc. LS1Edit may be even better for this type of work, but unfortunately I don't have any experience with it yet <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
Anyway, just a thought.
Thread Starter
Launching!
Joined: Dec 2001
Posts: 204
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From: Salem, NH
Re: Wanting more low end and throttle response I am about to have custom tuning done to fix my idling problems, maybe the tuning will give me some better response if timing and air/fuel is optimized? (Fulton 1) you are exactly right, the car "feels" heavier for some reason. I figured cats would give it a lighter feel ( for lack of a better word <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> )
Re: Wanting more low end and throttle response I don't know about the 3" Y being too big... after all, SLP's come w/ a 3" Y and while they aren't the beefiest headers in the world when it comes to power, neither are they notorious for resulting in sluggish low RPM behavior.
As delivered, the SLP Y that comes with the headers is dual 3" into a single 3"... I recently bought a Flowmaster Y that's dual 3" into a single 4" to mate with the Mufflex that'll go in when I go heads/cam.
What I am thinking is this- that with a 3" Y the car feels sluggish down low, but that is only because it pulls so well up high. Ever ridden a Yamaha R6?? Same thing... people say that they have no low end to them- simply not true. What IS true, though, is that when compared to the top end of the power band, the lower end feels mushy.
Or maybe I'm babbling; you decide... <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
As delivered, the SLP Y that comes with the headers is dual 3" into a single 3"... I recently bought a Flowmaster Y that's dual 3" into a single 4" to mate with the Mufflex that'll go in when I go heads/cam.
What I am thinking is this- that with a 3" Y the car feels sluggish down low, but that is only because it pulls so well up high. Ever ridden a Yamaha R6?? Same thing... people say that they have no low end to them- simply not true. What IS true, though, is that when compared to the top end of the power band, the lower end feels mushy.
Or maybe I'm babbling; you decide... <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
TECH Enthusiast
Joined: Feb 2002
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From: chicago
Re: Wanting more low end and throttle response I just skimmed through but I didn't see anything about an hpp3.You can install the tuning option and it may help a little. If that don't work try a 100hp dry shot and wola instant throttle responce and tons of low end torque!! <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Thread Starter
Launching!
Joined: Dec 2001
Posts: 204
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From: Salem, NH
Re: Wanting more low end and throttle response I just got 3" high flow Car Sound cats installed! It sounds SO much better, it really isn't even that much quieter, but so much deeper and smoother. IMO, it feel faster now from 1800-3000 rpm's, this would not help any for the people who don't drive in that range much, but I drive there a lot and and happy with the cats. Thanks for the info guys, I just figured the only way to really tell myself is trial and error <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Staging Lane
Joined: Feb 2002
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From: Jupiter, FL
Re: Wanting more low end and throttle response </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> Ever ridden a Yamaha R6?? Same thing... people say that they have no low end to them- simply not true. What IS true, though, is that when compared to the top end of the power band, the lower end feels mushy. </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Ah, yes, the world of two wheels. Some car folks make the grave mistake of believing that since a 600cc sportbike is "only a 600" that it will be an easy win. Not so in the case of all modern supersport 600's, for ex: CBR600F4i, R6, GSX-R600, ZX-6R. These bikes consistantly run in the high 10's bone stock. The second-rate 600's and older supersports will run in the mid-to-low 11's. Even my Bandit 600 with its 1980's air-cooled engine and heavy steel frame would do mid-to-high 12's.
