mild bolt on '99 LS1 M6
mild bolt on '99 LS1 M6 helped out in a local dyno day and decided to throw my car on to see what difference an LS6 intake, ported TB, and a quick street tune got me over my stock with SLP lid. ended up a little confused.
first off, on the street my buddy leaned out the PE table from about 11.7 to 12.2. he then started adding timing until we got a knock count then backed it off. ended up adding 7* of timing above the base. I think we went from 21 to 28. on the street it ran great, felt very good.
a couple days later, same tank of gas even, I dyno'd it and got these results:
it was getting some knock just before 5000 rpm and pulling timing so my buddy flashed the stock tune back in. it ended up picking up everywhere with no knock. we were both puzzled as he explained to me it should not knock on the dyno since the load isnt as much as on the street. just to be safe we kept the stock PE table and timing tables in place.
I compared it to my last dyno in may with just an SLP lid:
I was really expecting a little better gain. mid range pick up was nice but I got barely anything around the hp peak. 5 hp from an LS6 intake and ported tb?
and in comparison, here are some other f-bodies that dyno'd the same day:
blue one is an 01 TA auto with SLP lid, pacesetter LTs, ORY, cutout, stock everything else.
red one is a '98 Z28 6 speed with 122k miles and an SLP lid.
green one is mine with LS6 intake, ported tb, SLP lid, and the factory tune with 148k miles.
I am just beginning to think the car was either a factory turd or its really showing its age.
track times kind of support the dyno. my best was a 13.6. I consistently run 13.7 and 13.8 with a best trap of 104.5.
first off, on the street my buddy leaned out the PE table from about 11.7 to 12.2. he then started adding timing until we got a knock count then backed it off. ended up adding 7* of timing above the base. I think we went from 21 to 28. on the street it ran great, felt very good.
a couple days later, same tank of gas even, I dyno'd it and got these results:
it was getting some knock just before 5000 rpm and pulling timing so my buddy flashed the stock tune back in. it ended up picking up everywhere with no knock. we were both puzzled as he explained to me it should not knock on the dyno since the load isnt as much as on the street. just to be safe we kept the stock PE table and timing tables in place.
I compared it to my last dyno in may with just an SLP lid:
I was really expecting a little better gain. mid range pick up was nice but I got barely anything around the hp peak. 5 hp from an LS6 intake and ported tb?
and in comparison, here are some other f-bodies that dyno'd the same day:
blue one is an 01 TA auto with SLP lid, pacesetter LTs, ORY, cutout, stock everything else.
red one is a '98 Z28 6 speed with 122k miles and an SLP lid.
green one is mine with LS6 intake, ported tb, SLP lid, and the factory tune with 148k miles.
I am just beginning to think the car was either a factory turd or its really showing its age.
track times kind of support the dyno. my best was a 13.6. I consistently run 13.7 and 13.8 with a best trap of 104.5.
5hp for the LS6 intake and P&P TB seem realistic to me seeing as they aren't being used to their full potential with stock exhaust, cats, and cat back. I think if you had had long tubes, ORY, and a catback, you would have seen around 10hp from the edition of the LS6 intake and P&P TB which is what most people see, and maybe 15hp from adding the LS6 intake and P&P TB if you were cammed.
Glad I saw this, because I almost bought that LS6 intake manifold this week, but decided on longtubes instead. But to the OP, get the exhaust going on the car and then you will see quite a difference. I remember when I did lt's on my LT1 it was one of the first things I did that I could tell made a big difference.
I have LTs, ORY, and catback ready to go on. I couldnt do both the exhaust and intake before the dyno day so I just did the intake. I really doubt ill gain ~40 rwhp adding just headers. all of these cars dont dyno 350 whp with boltons... some guys had to get turds (me)
The highest my 99 dynoed was 311rwhp after being tuned. Also put down 323rwhp with the converter locked. I have an LS6 intake, p&p t/b, and OBX headers with no exhaust. I also have an A4 with a loose SS4000 converter. With 140k miles, you might want to look into valve springs. I'm putting a fresh set in my 155k mile engine right now. My graphs also looked a lot choppier at the top end. Mine also ET's slightly better 
yeah and how much does yours weigh?
I bet mine is around 3800 lbs with me in it. I am ~260-270 lbs. If I can pull 106-107 mph traps out of it I would be ecstatic but I dont think im gonna be hitting that. I am going to try and get to the drag strip 2 fridays from now. it will be nice and cool compared to all the other times I ran the car in the summer heat.
I bet mine is around 3800 lbs with me in it. I am ~260-270 lbs. If I can pull 106-107 mph traps out of it I would be ecstatic but I dont think im gonna be hitting that. I am going to try and get to the drag strip 2 fridays from now. it will be nice and cool compared to all the other times I ran the car in the summer heat.
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yeah and how much does yours weigh?
I bet mine is around 3800 lbs with me in it. I am ~260-270 lbs. If I can pull 106-107 mph traps out of it I would be ecstatic but I dont think im gonna be hitting that. I am going to try and get to the drag strip 2 fridays from now. it will be nice and cool compared to all the other times I ran the car in the summer heat.
I bet mine is around 3800 lbs with me in it. I am ~260-270 lbs. If I can pull 106-107 mph traps out of it I would be ecstatic but I dont think im gonna be hitting that. I am going to try and get to the drag strip 2 fridays from now. it will be nice and cool compared to all the other times I ran the car in the summer heat.
my buddy has tuned several turbocharged LSx vehicles as well as his own turbo 3800. I trust him but the car has been acting weird lately, put the stock tune back in to be safe.
yeah you really need some headers and other mods to show some bigger gains from the intake. I wouldnt worry about the tune at this point if you plan on doing anymore mods in the near future. Your best and most saving money way would be to save and get some headers, a good flowing exhaust system or at least a cutout after the headers somewhere and with the high mileage, just make sure the valve train is running strong, ie: rocker arms, springs, valves, seats, retainers, pushrods, lifters, etc. Make sure you have good oil pressure too and oil pump is pushing enough oil. I really didnt notice too big of an increase in power with the change to Ls6 intake with the stock exhaust mani's but with the longtubes, it was night and day, even before tuned. Once I'd hit 4k with the LT's and ls6 intake, it took off compared to stock. Great SOTP feel 
If you check the Ls1howto intake manifold swap I attached, you see he gained a solid 24whp/14tq with just the ls6 intake swap in his fbody. But again, it had LT's and other bolt-ons. Thats why its best to get a few mods together because they all work in conjunction to help each other produce max power.
If you check the Ls1howto intake manifold swap I attached, you see he gained a solid 24whp/14tq with just the ls6 intake swap in his fbody. But again, it had LT's and other bolt-ons. Thats why its best to get a few mods together because they all work in conjunction to help each other produce max power.
