H/C Install and now totally confused.
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Where did the torque go? - Help! Well, over the past week, I had AP Engineering install the PP LS6 style heads and the TSP 231/237 cam. The cam had the 112 lsa. These guys are very professional and did a extremely good job. Now for the confusing part, they dyno tuned the car today on their Mustang dyno. Now I know the Mustand dyno is not going to be close to the numbers on a dynojet. They dyno tuned the car last April 2003 when I had the DTS rear with the 4:10 gear, the steel driveshaft and the Spec Stage III clutch put in. At that time, the car dyno'd at 335.8 hp and 355.5 ft lbs of torque. The car had all of the mod's in the sig below. I don't know what I was expecting out of these heads and this cam, because I had read about the Mustang dyno producing lower numbers. That being said, the dyno today produced 385.8 hp and are you ready for this, 339.6 ft lbs of torque. I'm stumped, why would the torque decrease like that. I still have the cats on, so Chris said thats 10hp, no cutout, okay say another 10 hp, even on a Mustang dyno, that could be , maybe. Can anybody explain why they think the torque decreased.
Last edited by SS125; Jun 11, 2004 at 08:48 PM.
odd...do you have a pic of the sheet so we can compare? is the loss all across the board er what? When i went with my pp 5.7's & 231/237 cam i gained 75/35 peak and gained across the board after 3800 rpms.
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Originally Posted by foff667
odd...do you have a pic of the sheet so we can compare? is the loss all across the board er what? When i went with my pp 5.7's & 231/237 cam i gained 75/35 peak and gained across the board after 3800 rpms.
Last edited by SS125; Jun 9, 2004 at 09:23 PM.
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From: Texas and Qatar
Any chance you can dyno on a Dynojet? The Mustang is better for tuning, but its kinda a thing where its just best to compare before/after numbers. The torque doesn't look right at all, although I remember someone else saying torque was really low after dynoing on a Mustang dyno...hmm
I do like how it peaks at 6600 though, at our elevation that cam peaks at 6300-6400.
I do like how it peaks at 6600 though, at our elevation that cam peaks at 6300-6400.
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Here are the dyno sheets. The first one shows a comparison to the dyno done last year. The second is a sheet of just yesterdays dyno.
Last edited by SS125; Jun 10, 2004 at 10:26 AM.
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Originally Posted by SS125
Here are the dyno sheets. The first one shows a comparison to the dyno done last year. The second is a sheet of just yesterdays dyno.
I don't see any pics or links LS1 Tech Stories
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My mods:
PP S2 5.3L heads
TSP 232R 232/228 .595/.588 112lsa
LS6 intake
3" Cutout
Pacesetter LT's w/ORY pipe (catless)
TSP Lid
I got tuned on the EXACT same dyno as you...
Dyno: 382rwhp / 346rwtq
Graph: http://lethalss.ssgraphix.com/images/dyno383-346.jpg
Also, I know of a dynojet @ 17 & Vandyke that will do 3 pulls for $75
-Steve
PP S2 5.3L heads
TSP 232R 232/228 .595/.588 112lsa
LS6 intake
3" Cutout
Pacesetter LT's w/ORY pipe (catless)
TSP Lid
I got tuned on the EXACT same dyno as you...
Dyno: 382rwhp / 346rwtq
Graph: http://lethalss.ssgraphix.com/images/dyno383-346.jpg
Also, I know of a dynojet @ 17 & Vandyke that will do 3 pulls for $75
-Steve
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Originally Posted by v8maro
My mods:
PP S2 5.3L heads
TSP 232R 232/228 .595/.588 112lsa
LS6 intake
3" Cutout
Pacesetter LT's w/ORY pipe (catless)
TSP Lid
I got tuned on the EXACT same dyno as you...
Dyno: 382rwhp / 346rwtq
Graph: http://lethalss.ssgraphix.com/images/dyno383-346.jpg
Also, I know of a dynojet @ 17 & Vandyke that will do 3 pulls for $75
-Steve
PP S2 5.3L heads
TSP 232R 232/228 .595/.588 112lsa
LS6 intake
3" Cutout
Pacesetter LT's w/ORY pipe (catless)
TSP Lid
I got tuned on the EXACT same dyno as you...
Dyno: 382rwhp / 346rwtq
Graph: http://lethalss.ssgraphix.com/images/dyno383-346.jpg
Also, I know of a dynojet @ 17 & Vandyke that will do 3 pulls for $75
-Steve
I'm going to call the guy your talking about, I think the place is on 16 mile rd. between Van Dyke and Mound though, right?
Bill
Yeah, andy's auto or something like that, my friend knows him, on the service drive near that bridge.
I say you will put down 423/365 on the dynojet, let me know.
Let me know if you ever want to meet up and hang out, I have a lot of fbody friends and we cruise together a lot.
-Steve
I say you will put down 423/365 on the dynojet, let me know.
Let me know if you ever want to meet up and hang out, I have a lot of fbody friends and we cruise together a lot.
-Steve
theres something odd about they dyno sheet...if you look at the two hp curves from 2600-3700 it looks like the new combo has more hp, but then if you look at the tq curves the old setup has more tq that makes no sense.
that makes no sense. Thread Starter
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The whole thing makes no sense, how do you install a new set of heads and cam and LOSE TORQUE!
Originally Posted by foff667
theres something odd about they dyno sheet...if you look at the two hp curves from 2600-3700 it looks like the new combo has more hp, but then if you look at the tq curves the old setup has more tq that makes no sense.
that makes no sense.
Originally Posted by SS125
...how do you install a new set of heads and cam and LOSE TORQUE!
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Originally Posted by Orange Peel
Did you guys degree the new cam wrong?? That will really jack up your numbers. Just something to check off the "if" list.
ok I'm a newbie here but I'm curious how do you degree a cam wrong
the reason I'm asking is because my cam numbers were lower than normal also after dyno tuning
I have a 2002 SS with a F13 and I dynoed @ 367rwhp and 351 trq
I'm suprised nobody has said this yet: Does it really matter what the dyno said? If it's tuned take it to the track and check out your new mph. If the a/f is good and it's not knocking, I'd go give it the business and see how it performs.
Granted, it seems to be monsoon season around here so I guess dynos are the only thing we can race right now!
Granted, it seems to be monsoon season around here so I guess dynos are the only thing we can race right now!