Why is my car putting down so much torque?
Why is my car putting down so much torque, and other Q's? I got my car dynotuned a month or so ago and put down about 365 rwhp and 376 rwtq. I was suprised that the peak rwhp wasn't higher. Also the hp peaks at about 5700 RPM, and the torque somewhere in the 4000 range.
I looked though a bunch of dyno numbers, and saw that I am putting down much more torque than some other guys with larger cams, and even some people with heads. Also I noticed that most people with modified motors put down higher peak horsepower than torque, mine being opposite. And... I noticed that most people have their horsepower peaking in the around 6500 or so.
Does anyone have an explanation to why my peak torque is so high, and why my horsepower peaks so low? I want to get a larger cam but don't want to end up with lower torque than what I have now.
I guess my engine likes the mid-range
Thanks
[EDIT]: Added graph.
This is a picture I took with the camera. It's of the 1st and 2nd run. On the 9th run we got 365. It only shows RWHP and A/F ratio, no RWTQ.
I looked though a bunch of dyno numbers, and saw that I am putting down much more torque than some other guys with larger cams, and even some people with heads. Also I noticed that most people with modified motors put down higher peak horsepower than torque, mine being opposite. And... I noticed that most people have their horsepower peaking in the around 6500 or so.
Does anyone have an explanation to why my peak torque is so high, and why my horsepower peaks so low? I want to get a larger cam but don't want to end up with lower torque than what I have now.
I guess my engine likes the mid-range
Thanks
[EDIT]: Added graph.
This is a picture I took with the camera. It's of the 1st and 2nd run. On the 9th run we got 365. It only shows RWHP and A/F ratio, no RWTQ.
Last edited by Ferocity02; Jul 7, 2004 at 02:38 AM.
With ur cam and mods, HP shouldnt peak at 5700RPM which lead me to believe u have a problem somewhere. Ur TQ numbers looks right for ur mods so thats a good thing. I didnt see titanum retainers in ur mods list? If u dont have it, your car might be experince valve float around 5700RPM which could cause the HP to drop earlier. Can u post ur dyno sheet so we can take a better look at it?
Done... It only shows rwhp, still waiting for the guy to send me my graphs.
I don't think it's valve float. The hp steadily drops off, wouldn't valve float cause it to hold steady?
I don't think it's valve float. The hp steadily drops off, wouldn't valve float cause it to hold steady?
Originally Posted by Ferocity02
I don't think it's valve float. The hp steadily drops off, wouldn't valve float cause it to hold steady?
EDIT: I posted before u added the graph. I cant tell what was the last number on the RPM scale when u guys stoped the run? Is that 6K or 6500RPM?
Originally Posted by LSs1Power
I have seen cars on the dyno with valve float and the HP drops steadily so its really hard to judge from the look of the graph. Look at the RPM and HP scale and compare it with another cars that have the same mods and then u can see if u have a valve float or not. I dont think there is any other explanation for your problem other than a valve float. We will just have to wait for the dyno sheet to have a better idea of your problem.
EDIT: I posted before u added the graph. I cant tell what was the last number on the RPM scale when u guys stoped the run? Is that 6K or 6500RPM?
EDIT: I posted before u added the graph. I cant tell what was the last number on the RPM scale when u guys stoped the run? Is that 6K or 6500RPM?
fwiw using the run viewer if you go to the right of the screen where it has the a/f and all that you should be able to click on that and select tq to view your tq curve...also u can hit the prt Scrn/sys Rq button to save that screen to your clipboard & paste it to a picture program like ulead or photoshop er whatever and shrink it down to size from there...as far as your graph goes do you still have your ls1 intake? I think most are peaking at like 5900 with that cam hp wise and around 4800-5000tq so your within limits and if you look at your tq like it would probably be flat from 4000-5000 anywayz or at least pretty close to it. The #'s themeselves dont seem that far off and it just appears that youve got a pretty decent combo. As far as your tq outweighing your hp 1. its a good thing 2. youve got a std 224/224 cam as now the biggest rage is split cams which are making good peak #'s but tq #'s have been lacking for the most part not to say its a bad thing, but that is the down side of a split cam especially as big as they are getting now. Bottom line I wouldnt worry about it too much, get an ls6 intake if you already dont have one, and enjoy the car.
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Originally Posted by Ferocity02
It's 6500 where is ends.
TECH Regular
Joined: Feb 2004
Posts: 451
Likes: 0
From: Indy
I had the same cam in my 99 Trans Am. I had LS6 intake, Jet Hot LTs, OR Y pipe, wide open Borla and made 363.6 HP and 366.2 TQ. I DID NOT have a pulley or ported TB either. My HP peaked right around 5,700 rpms and dropped steadily after that. TQ peaked right at 4,800 rpms. I thought my peaks were very early also. Seems like your making very nice TQ though. That X pipe probably plays a roll in your added TQ. I always wondered why my peaks were so soon also.
Not valve float. Without the LS6 intake the car is chocking up top. I have already the exact mods as you with an LS6 intake and the car put down 387 rwhp and 382 rwtq on really heavy 18's in some nasty heat. I friend of mine has about the same mods and doesn't have the ls6 intake and put down almost identical power as you.
BTW....my car peaked at 6,000 with the TR224/112.
BTW....my car peaked at 6,000 with the TR224/112.
Honestly you peak a little earlier than most but everything looks pretty good.
I cant imagine valve float with this combo using the 918's.
I suggest a LS6 intake as well.
Throw some stock LS6 heads on there and your new peak will be 6500 RPM's.
I cant imagine valve float with this combo using the 918's.
I suggest a LS6 intake as well.
Throw some stock LS6 heads on there and your new peak will be 6500 RPM's.
Originally Posted by technical
How about the Mac headers? Since they are not LT's they might be worth a little more torque.
No offense, but where did that come from?
These cars aren't mustangs, you'll gain torque moving up from MAC mids, to pretty much any LT header.
I would think with that cam on a 114 you would peak just a tad higher. Either way your not far off, and your numbers are pretty stout for a 99. I would have to agree with the addition of an LS6 intake.... easy HP
11 Second Club
Joined: May 2004
Posts: 226
Likes: 0
From: Va. beach,Va
I too would like to know why his torque is higher than hp?? Typically it is the other way around. Is it the ls1 intake that created this condition??? I know the x pipe would add torque, but this much??? Looking at other guys torque
it about 20 to 30 below torque, maybe come close to matching it but rarely
over in particularly stock cars.Anyways.... what causes this???
it about 20 to 30 below torque, maybe come close to matching it but rarely
over in particularly stock cars.Anyways.... what causes this???
I am wondering why my torque is high also I put down 356hp and 372.3ftlbs with the stock cam in 90 degree heat, not complaining though. I was thinking of getting a cam but am kinda scared of losing some torque.
My tuner said the torque may be higher than peak hp due to a restriction in the exhuast or intake. It makes sense, but don't know if that applies to me with my cam, or the stock cam. I guess smaller cams just make better low end. I have been looking through some dyno numbers, and my puni TR224 is making more torque than a lot of the huge G5X3 and T-Rex cam cars. Not as much peak hp though.
Add an LS6 intake and it should increase your peak a hundred rpms or so maybe more. I noticed that after I added my heads my TR224 112 now peaks around 6100 where on the stock 241 heads it was closer to 5950-6000 rpms. My car has always made good torque with my cam. On stock heads with an open QTEC I pulled 386rwtq. After adding heads and replacing my ORY with a Catted Y I now make 391rwtq. The heads really woke the car up down low with 300rwtq at 2300rpms, 325rwtq at 2500rpms and 352rwtq at 3000rpms and this is thru 3" Carsound Cats. Max torque is 391 at 4900rpms.