Vortech Traction issues
#1
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I got a chance to ride in a 350z with a Greddy Twin turbo kit on it this weekend and was blown away by the power but noticed the car could not find traction in first and second gear. I know twin turbos create alot of torque down low but it was ridiculous how little traction the car could get. The car had a 3.5 gear with vlsd and 275 tires on the back. What is the traction like with a vortech kit? Also, how much does the 3.9 gear changes things?
#3
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I'm going Vortech in March and hope to achieve 430-440 hp and 350-360 torq while at the same time I'm planning new tire purchase but don't want to go too big that it affects handling or gas mileage. I though 275s would do the trick but was shocked how littel traction that 350z got even with that size of tire.
#4
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the vortech will have better traction because it won't generate as much tq so early in the powerband to upset the tires. The shape of the tq curve lends itself well to traction because of how it reaches peak power at the top of each gear. So as power increases, your speed increases and that helps manage traction not to mention giving you more time to react. This is the same thing why larger turbos are better with traction since they spool later in the powerband once you've gotten more speed built up
with my setup, I can get full WOT traction in 2nd gear if the tires are warm and it's 100-110 degrees outside with my 455whp map. I have the 3.9 FD, 295 tires, nismo LSD. I can go WOT in 1st gear up to about 4000 rpms, then have to reduce throttle to about 50% at redline
when I had around 390-400whp, I did have full WOT traction in 1st gear
however when it's 50-60 degrees outside and I use my 477whp map, I usually can't get full WOT traction in 1st-3rd gears, and sometimes 4th loses traction too depending on if my tires are warmed up or not
It's VERY easy to manage the traction. I can go WOT after each gear change and leave my foot at WOT for a couple seconds and then can start to feel when it's about to overpower the tires because it's a gradual loss of traction. So my method is to go WOT right after changing gears and then gradually start reducing throttle a little.
A strong TT setup I'd imagine would be an absolute animal to try to control. I'm not sure you'd ever really be able to go WOT at all until higher gears.
275 tires are way too small for FI. They work fine for NA though. Hell I think 295's are too small for FI on this car
I think the 3.9 FD works great with the vortech if you have a good tire setup and 400-420whp. It really makes the car come alive.
I'm considering 315 kumho V710 or 305 toyo R888 tires for the rear when I get my next set of tires
I hate losing traction. It completely sucks
with my setup, I can get full WOT traction in 2nd gear if the tires are warm and it's 100-110 degrees outside with my 455whp map. I have the 3.9 FD, 295 tires, nismo LSD. I can go WOT in 1st gear up to about 4000 rpms, then have to reduce throttle to about 50% at redline
when I had around 390-400whp, I did have full WOT traction in 1st gear
however when it's 50-60 degrees outside and I use my 477whp map, I usually can't get full WOT traction in 1st-3rd gears, and sometimes 4th loses traction too depending on if my tires are warmed up or not
It's VERY easy to manage the traction. I can go WOT after each gear change and leave my foot at WOT for a couple seconds and then can start to feel when it's about to overpower the tires because it's a gradual loss of traction. So my method is to go WOT right after changing gears and then gradually start reducing throttle a little.
A strong TT setup I'd imagine would be an absolute animal to try to control. I'm not sure you'd ever really be able to go WOT at all until higher gears.
275 tires are way too small for FI. They work fine for NA though. Hell I think 295's are too small for FI on this car
I think the 3.9 FD works great with the vortech if you have a good tire setup and 400-420whp. It really makes the car come alive.
I'm considering 315 kumho V710 or 305 toyo R888 tires for the rear when I get my next set of tires
I hate losing traction. It completely sucks
Last edited by sentry65; 01-27-2008 at 01:53 PM.
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Yea im TT on a stock block 9psi and cant get traction in 1st and most of second and i have 275's in the rear also..but i believe 295's BFG Dr's should cure that..or atleast make it a lot more managable
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As of a couple weeks ago, I'm now running a 3.9FD with my Vortech. Definitely easier to get wheel hop in 1st/2nd. Improvement in acceleration in around town driving is awesome, though. Unfortunately, I think the shorter gearing did hurt my peak #'s on the dyno...
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Originally Posted by carrera4s
I'm TT and I lose complete traction in 1st. In 2nd if i'm higher up on the powerband I will have full traction but if I do a 35mph roll in 2nd I'll be in spin city
Tonight I'm swapping out my 3.5FD to a 3.3FD and installing Cusco RS LSD.
Hopefully that will fix some of those issues
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I think I really need to dyno my car again. I have 285 19's KDW2 and I have full traction on 1st to 2nd. I do loose traction if launch the car but I get full traction if I just floor the car from a roll. I think my clutch doesn't grab that hard anymore so that could be a reason too.
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Originally Posted by Triple8Sol
As of a couple weeks ago, I'm now running a 3.9FD with my Vortech. Definitely easier to get wheel hop in 1st/2nd. Improvement in acceleration in around town driving is awesome, though. Unfortunately, I think the shorter gearing did hurt my peak #'s on the dyno...
#19
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Originally Posted by sentry65
the vortech will have better traction because it won't generate as much tq so early in the powerband to upset the tires. The shape of the tq curve lends itself well to traction because of how it reaches peak power at the top of each gear. So as power increases, your speed increases and that helps manage traction not to mention giving you more time to react. This is the same thing why larger turbos are better with traction since they spool later in the powerband once you've gotten more speed built up
with my setup, I can get full WOT traction in 2nd gear if the tires are warm and it's 100-110 degrees outside with my 455whp map. I have the 3.9 FD, 295 tires, nismo LSD. I can go WOT in 1st gear up to about 4000 rpms, then have to reduce throttle to about 50% at redline
when I had around 390-400whp, I did have full WOT traction in 1st gear
however when it's 50-60 degrees outside and I use my 477whp map, I usually can't get full WOT traction in 1st-3rd gears, and sometimes 4th loses traction too depending on if my tires are warmed up or not
It's VERY easy to manage the traction. I can go WOT after each gear change and leave my foot at WOT for a couple seconds and then can start to feel when it's about to overpower the tires because it's a gradual loss of traction. So my method is to go WOT right after changing gears and then gradually start reducing throttle a little.
A strong TT setup I'd imagine would be an absolute animal to try to control. I'm not sure you'd ever really be able to go WOT at all until higher gears.
275 tires are way too small for FI. They work fine for NA though. Hell I think 295's are too small for FI on this car
I think the 3.9 FD works great with the vortech if you have a good tire setup and 400-420whp. It really makes the car come alive.
I'm considering 315 kumho V710 or 305 toyo R888 tires for the rear when I get my next set of tires
I hate losing traction. It completely sucks
with my setup, I can get full WOT traction in 2nd gear if the tires are warm and it's 100-110 degrees outside with my 455whp map. I have the 3.9 FD, 295 tires, nismo LSD. I can go WOT in 1st gear up to about 4000 rpms, then have to reduce throttle to about 50% at redline
when I had around 390-400whp, I did have full WOT traction in 1st gear
however when it's 50-60 degrees outside and I use my 477whp map, I usually can't get full WOT traction in 1st-3rd gears, and sometimes 4th loses traction too depending on if my tires are warmed up or not
It's VERY easy to manage the traction. I can go WOT after each gear change and leave my foot at WOT for a couple seconds and then can start to feel when it's about to overpower the tires because it's a gradual loss of traction. So my method is to go WOT right after changing gears and then gradually start reducing throttle a little.
A strong TT setup I'd imagine would be an absolute animal to try to control. I'm not sure you'd ever really be able to go WOT at all until higher gears.
275 tires are way too small for FI. They work fine for NA though. Hell I think 295's are too small for FI on this car
I think the 3.9 FD works great with the vortech if you have a good tire setup and 400-420whp. It really makes the car come alive.
I'm considering 315 kumho V710 or 305 toyo R888 tires for the rear when I get my next set of tires
I hate losing traction. It completely sucks
Hey Sentry
You posted a video a while back of you doing a WOT run from 2nd with your 3.9 rear gears and 455whp tune . You had full traction in 2nd with the 3.9 rear gears .
If I remember right....wasnt this video done at night time when temps woul;dnt have been hot and the street surface would have cooled off ?
#20
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Originally Posted by rcdash
Shorter gears shouldn't hurt whp on the dyno - that's odd. If the dyno is completely uncorrected a swap to shorter gears (higher ratio) should bump up wtq in any given gear.
And to add....having wider and better tires would help some . But unless you live in 115 degree weather that bakes the street . Wider tires wouldnt help in 90% of the country with power levels much over 400whp
Last edited by booger; 01-28-2008 at 02:36 PM.