Naptown Dave Posted May 4, 2015 Share Posted May 4, 2015 I may get sent to the Tool Shed for this one but here goes. I just crossed the magical 500 mile mark on my new clutch so I've been driving a little more aggressively on my new build. Without abusing the left pedal my car just digs and launches, I expected a little more tire smoke to be generated. I'm running an LS6, T56 with 3.54 HLSD rear and BFG SportComp 2s 17R 275s the engine is as of yet untuned. Granted there are so many variables even with similar builds I don't expect a definitive answer but just a reality check, is my motor down on power or is the rubber that sticky? I have a TSP 228R on order and dyno tune scheduled for the end of the month and I imagine that and some test and tune nights at the strip will answer my question but I want your guys 2 cents. Quote Link to comment Share on other sites More sharing options...
Zfan1 Posted May 4, 2015 Share Posted May 4, 2015 I use 275/50-15 Mickey Thompson drag radials and it dead hooks. Foot braking it the other night at Denton it went 1.42 60 ft. Quote Link to comment Share on other sites More sharing options...
michael wales Posted May 4, 2015 Share Posted May 4, 2015 ever since i installed my 17x7s with actual performance tires, my grip is much improved but my L6 is no where near the LS in power....yet. Quote Link to comment Share on other sites More sharing options...
Phantom Posted May 4, 2015 Share Posted May 4, 2015 Even with the 280Z at 3,000 lbs and a bone stock LS1 going through a T56 and 3.70:1 LSD I light up the 225/50-16's in a heartbeat. I have to launch at about 1,500 RPM, run a bit light on the throttle until second gear and then I can bury it and leave it there. My son's '73 240Z has BFG 275/40-17's on the rear and he smokes those in a heartbeat. He has a T56 hooking through a 3.69:1 R230. He also has issues with wheel spin on the 1-2 shift and then a bit on the 2-3 shift. The BFG's just don't hook well. You guys with automatics will get us clutchy guys every time in the 1/4 mile but we sure do have fun in the twisties. Quote Link to comment Share on other sites More sharing options...
Zfan1 Posted May 5, 2015 Share Posted May 5, 2015 I agree Phantom. When I finally outgrow drag racing Ill be swapping to a six speed manual. Quote Link to comment Share on other sites More sharing options...
Naptown Dave Posted May 5, 2015 Author Share Posted May 5, 2015 That's what I was looking for Phantom, I guess we'll see what the cam and dyno tune bring. Mine won't break loose with a quick but smooth hit on the throttle from a rolling idle in first. Quote Link to comment Share on other sites More sharing options...
The Infidel Posted May 5, 2015 Share Posted May 5, 2015 275/60/15 M/T tires, no issues. Quote Link to comment Share on other sites More sharing options...
mistafosta Posted May 5, 2015 Share Posted May 5, 2015 275/60/15 M/T tires, no issues. You hooked well with less than that.. Quote Link to comment Share on other sites More sharing options...
Naptown Dave Posted May 6, 2015 Author Share Posted May 6, 2015 I guess in my push to get done I ignored the fact that I have a 85mm truck MAF and the ECU is still on factory tune. I did a little digging in the LS site and it seems an uncalibrated MAF and IAT will cause the ECU to add fuel and pull timing to safeguard the engine. On my way home from work I picked up a new stock MAF and IAT and it made a considerable difference, much chrisper and it comes on at 3500 instead of falling off. I also had a box sitting on my front porch from TSP so I'm pretty excited about getting that cam in and my tune on. We'll see if that tests those 275s a little more. Quote Link to comment Share on other sites More sharing options...
Zfan1 Posted May 6, 2015 Share Posted May 6, 2015 I have run 9.70's on a puny 235/60-15 tire Quote Link to comment Share on other sites More sharing options...
NewZed Posted May 6, 2015 Share Posted May 6, 2015 . Without abusing the left pedal my car just digs and launches, I expected a little more tire smoke to be generated. So you have what the drag racers want, but would like a little more show when you go? Kind of funny. Doesn't suspension setup affect traction pretty dramatically? If you have adjustable shocks you could probably crank them up to max damping and get spin a little easier. Quote Link to comment Share on other sites More sharing options...
Naptown Dave Posted May 6, 2015 Author Share Posted May 6, 2015 (edited) So you have what the drag racers want, but would like a little more show when you go? Kind of funny. Doesn't suspension setup affect traction pretty dramatically? If you have adjustable shocks you could probably crank them up to max damping and get spin a little easier. Right NZ! I mostly wanted to get a rough comparison on hp/tq on similar builds, the real answer will come when I get a proper tune. Hopefully I will have to be a bit careful on the throttle to keep it hooked up. Putting the correct MAF and IAT feel like a step in the right direction. Edited May 6, 2015 by Naptown Dave Quote Link to comment Share on other sites More sharing options...
EF Ian Posted May 6, 2015 Share Posted May 6, 2015 I run sticky R1R tyres but only 225/45/16's with 480hp and 490lb/ft and with softsh suspension at the rear it just squats a bit, digs in and shoots off. That is as long as I don't launch too hard, if I do then its just spins up but I still think that's impressive given the small tyres. I can take off really fast if I start to feed in the throttle as I let the clutch out, not quite a high rpm launch but its still takes off really quick. Quote Link to comment Share on other sites More sharing options...
crapforum Posted May 12, 2015 Share Posted May 12, 2015 ever since i installed my 17x7s with actual performance tires, my grip is much improved but my L6 is no where near the LS in power..ever.. Fixed it lol Quote Link to comment Share on other sites More sharing options...
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