with the PPC headers, RT hi-flo cats amd the hi-flo Y-pipe. Everything is fine except I need to adjust the AFR based on the sniffer. I'm going to shoot for 12.9 - 13.0 on the sniffer. I would think that with the hi-flo cats there would be a negligible drop in the readings.
I'm keeping my fingers crossed for a good increase in HP and TQ from the headers. Posted by Hawkeye (Member # 88) on :
Keep us posted, I've yet to get mine in, the shops around here don't even call you back!
I have to go to the Detroit area and they are all so, so busy!
Posted by Mike2001SS (Member # 2088) on :
Last time we checked mine it was running at 12.9 with no miss fire or knock
Posted by Happy_Dan (Member # 118) on :
I think it is best at about 11.0
Posted by Brian's 01 SS (Member # 1499) on :
I am running just above 13.0 for an average. And I have no knock retard. I would think your best ratio should be aroung 13.0-12.9. Just my .o2
Posted by Brian's 01 SS (Member # 1499) on :
quote:Originally posted by Happy_Dan: I think it is best at about 11.0
That sounds pig rich!!
Posted by Kevin V 2002 SS (Member # 1025) on :
11.0 is too rich. For a NA LS1 12.8 - 13.1 is ideal. Of course if you have enough time on a dyno tune you can make as many runs to try and fine tune for that extra couple of HP.
Posted by Kevin V 2002 SS (Member # 1025) on :
Well, I gained 12 rwhp but only 1 rwtq. Not exactly leaping for joy on the tq. I'm hoping that I'll gain the full benefit of the headers with heads and cam. If I wasn't going with heads and cam I'm not sure I'd bother with headers.
I was also very dissappointed to be under the car and seeing rust on the PPC headers already, on a car that doesn't see any weather. One of the reasons I bought the PPC so I wouldn't have to worry about rust. There isn't alot, yet, but it will get worse if it has already started this quick.
Posted by DaddySS (Member # 848) on :
quote:Originally posted by Kevin V 2002 SS: Well, I gained 12 rwhp but only 1 rwtq. Not exactly leaping for joy on the tq. I'm hoping that I'll gain the full benefit of the headers with heads and cam. If I wasn't going with heads and cam I'm not sure I'd bother with headers.
I was also very dissappointed to be under the car and seeing rust on the PPC headers already, on a car that doesn't see any weather. One of the reasons I bought the PPC so I wouldn't have to worry about rust. There isn't alot, yet, but it will get worse if it has already started this quick.
So what was your total HP/TQ. Is the "after" since you put in the 4.10s, or were they there for the before? I only picked up 12 with my headers also but it revved much faster and the throttle was more responsive so the HP numbers don't tell the whole story.
Where is the rust? If it is where the coating is that's not good, if it's just dripping from the hidden areas where the coating doesn't reach so well, that's not too bad.
Posted by Elie Garfinkel (Member # 1635) on :
quote:Originally posted by Kevin V 2002 SS: Well, I gained 12 rwhp but only 1 rwtq. Not exactly leaping for joy on the tq. I'm hoping that I'll gain the full benefit of the headers with heads and cam. If I wasn't going with heads and cam I'm not sure I'd bother with headers.
Kevin, Don't forget that you have 4.10s. If the goal is to install a H&C pkg. while keeping the 4.10s, you might be in fact, happier with a setup that makes more power up high in the HP range, rather than having gobs of low-end torque. The 4.10s in the stock 10-bolts tend to be pretty fragile with a H&C/headers setup The 4.10s can offset a lower torque rating somewhat. Another thing that can be done on the dyno tuning is to turn off the torque management program in out cars. This actually backs the power off during hard upshifts to prevent shock to the drivetrain. Although the A4s tend to benefit more in terms of the SOTP buttmeter when this is done, therewas a noticeable difference when this program was "played with" in my 6MN - much snappier shifts! I got a little bit of a surprise when I broke the rear tires loose on a 5500 rpm 3-4 upshift! Have fun!
Best regardSS,
Elie
Posted by Kevin V 2002 SS (Member # 1025) on :
The rust is actually covering small areas of the bottom of the headers, they are definitely beginning to rust.
The total was 336.3 rwhp and 344.1 rwtq. I already had the 4.10's on previous dyno's.
Posted by Hawkeye (Member # 88) on :
I have an appointment booked for mine. Will post the results. (June 30, in Detroit)
Now, I have to check my headers. My complaint now is that it's really loud! I'll do the rust check today and see.
Ellie, Tourque Management program is a good point. I didn't know it was a field that could be changed. Can LS1 edit change it? I can't use Diablo with my '98.
Posted by Mike2001SS (Member # 2088) on :
Kevin I have found that with certain exaust changes you may gain how it revs and a little HP but lose some torque especially midrange torque. the real benefit of the headers is with the right cam,bye themselfs its alot of money for the gain but they do sound good also
Posted by Elie Garfinkel (Member # 1635) on :
quote:Originally posted by Hawkeye: I have an appointment booked for mine. Will post the results. (June 30, in Detroit)
Ellie, Tourque Management program is a good point. I didn't know it was a field that could be changed. Can LS1 edit change it? I can't use Diablo with my '98.
[ 20. June 2004, 11:00 AM: Message edited by: Elie Garfinkel ]
Posted by Hawkeye (Member # 88) on :
Thanks for the links. But as you mentioned not much info for the 6 speeds. I could see the importants for autos, but I did not think it was applicable to manuals at all. Are you sure yours made a difference or was it just the right conditions that day. Although, I have had times when power shifting didn't seem to work. Maybe I was quicker than the PCM thought I should be!
Posted by Elie Garfinkel (Member # 1635) on :
quote:Originally posted by Hawkeye: Thanks for the links. But as you mentioned not much info for the 6 speeds. I could see the importants for autos, but I did not think it was applicable to manuals at all. Are you sure yours made a difference or was it just the right conditions that day. Although, I have had times when power shifting didn't seem to work. Maybe I was quicker than the PCM thought I should be!
That's the question of the day, Brian. One of those links made reference to doing it with a 6MN and seeing the rear end getting all squirrely... I dunno... the dude who took the TM out of my car was the same guy who put the heater next to the dyno sensor to give me a (totally bogus)reading of 395 RWHP! However, the bottom line is that I NEVER broke the tires loose on a 3-4 shift and there is definitely a difference. Now you've got me thinkin' - I'm gonna check into this a bit further and call ARE tomorrow and speak to Pete. At at this point I know I'm gonna get a straight answer! Thanks! I'll keep you posted 'cuz I know you're going in next week!~
![[Big Grin]](biggrin.gif)
![[Frown]](frown.gif)
The 4.10s can offset a lower torque rating somewhat. Another thing that can be done on the dyno tuning is to turn off the torque management program in out cars. This actually backs the power off during hard upshifts to prevent shock to the drivetrain. Although the A4s tend to benefit more in terms of the SOTP buttmeter when this is done, therewas a noticeable difference when this program was "played with" in my 6MN - much snappier shifts! I got a little bit of a surprise when I broke the rear tires loose on a 5500 rpm 3-4 upshift!![[Confused]](confused.gif)
However, the bottom line is that I NEVER broke the tires loose on a 3-4 shift and there is definitely a difference. Now you've got me thinkin' - I'm gonna check into this a bit further and call ARE tomorrow and speak to Pete. At at this point I know I'm gonna get a straight answer!