Big Bu Bu

iTrader: (4)

So for the guys that have been following my plight, my Katech build was almost impossible to tune for driveability. Turns out that the 90mm "takeoff" TB we used might have been the culprit ( something mechanical). So the debate raged on about whether there was a benefit to using a 102 on a stock cube bolt on mod LS6 or pick up another 90mm.. It was even suggested you could lose low end torque with the big blade 102. So I was faced with buying a new TB. I went with the Nick Williams 102. I was concerned that it would have poor low speed manners but I knew that it wouldn't be to big. Justin Meyers from Modern Muscle in Oswego Il. talked me into it so off we went. I did fuel rails and injectors (I was at 106% duty cycle). The bottom line is this. If you are going to upgrade to a bigger intake the FAST 102LSXr with the 102 TB performs slightly better than the 90mm set up with an LSXr. So if you need to buy a TB anyway don't be afraid that the 102 is to big on a stock cube motor. Driveability is great. I actually gained slightly across the entire RPM range even picking up about 6 more ft/lbs of torque at around 3800rpm. Now if you already have a 90mm to put on an LSXr then you would have think about whether the gains from a 102 are worth it. I'll scan my dyno sheet at work tommorrow and show the difference between a LSXr with 90mm vs 102mm on a full bolt on motor with a very mild cam.

Check out these pics. The NW is a real nice piece.

http://s879.photobucket.com/albums/a...illiams%20102/

ColeGraham

iTrader: (8)

that is nice...well played.

what numbers are you putting down (or do you think you will put down) with the new TB?

Big Bu Bu

iTrader: (4)

My LS6 is set up for road racing with a lower lift mild GM hot cam. Believe it or not this cam put down more mid range torque than any other off the shelf, "street" cam. That's where you need it on a road course. I put down 418rwhp/395 ftlbs on a Mustang dyno. Probably 450 on a Dyno Jet. The new TB really didn't make that much of a difference. If I go to a bigger cam next year, the benefit of the 102 will more likely be greater.

ColeGraham

iTrader: (8)

ah, didnt know you like to road courses.

still, good numbers for an N/A road car.

tweeter81

That is awesome, and those numbers are perfect! I love the guys who think they need 500+ rwHP to make them think they really have something, all the while, they have to feather the throttle and can never use more than 25% of the throttle or they lose traction. Give me your setup any day!

I bet your car will run circles around a lot of much higher HP cars at the track because of the really nice usable torque curve.

Congrats on the new TB and I hope all the tuning makes is perfect!

Also, if you don't mind me asking: How much money do you have into the LSXr intake, the fuel rails, and the TB (just the part costs)?

KamaSutra

Thats good news, I'll keep this in mind when I decide to get these bolt-ons. Did the coil relocate kit come with the Katech build or did you get those afterwards? If so, what brand?

Big Bu Bu

iTrader: (4)

Thanks Tweet. I probably have 1600 into that set up. Pretty pricey but it's the only game in town.

Big Bu Bu

iTrader: (4)

Katech did it all. You really can't do the valve covers without the coil relocate. It's more of a bling thing than a performance mod. It can be pretty pricey (especially if you custom paint them) but it looks cool. That set up does make more lifter noise because the covers are more hollow and the coils don't muffle the clicking. Add the FAST set up which is another big hollow piece and the lifter noise is increased.

itsslow98

iTrader: (18)

$1600 , damn we have an expensive hobby. I think im gonna have to make due with the stock ls6 intake and TB for a while thats too much money lol.

Big Bu Bu

iTrader: (4)

That Nick Williams piece is 550-600. Thats the problem.

Nasty N8

iTrader: (33)

but worth it

Big Bu Bu

iTrader: (4)

Here is the 102 TB vs the 90 on a FAST LSXr 102 intake. The 102 is not to big for a stock cube motor and actually adds a little more power throughout the rpm range. This is a new Dyno Jet load bearing dyno (eddy current) similar to a Mustang or a Super Flow.

blk04V

iTrader: (1)

Nice!

lubelizard

iTrader: (5)

What size injectors did you go with?

Big Bu Bu

iTrader: (4)

42#. I was at 106% duty cycle. My injectors were acting like port holes instead of fuel valves.

lubelizard

iTrader: (5)

What's the duty cycle with the 42s? Is it 42lbhr at stock pressure? What injector type?

Big Bu Bu

iTrader: (4)

I was told we were going with Bosch 42#s., They look like these. I'm assuming these and I've asked them to give me the part # for my records.

http://www.turnermotorsport.com/html...UCT_ID=42LBINJ

I'm not sure about the new duty cycle but I'm assuming 80%. I will ask my tuner for you Richard.

Jasonv8z

iTrader: (1)

Do you think your drivability issues with the LS2 90mm were due to a faulty throttle body or was it something else like wiring the LS2 tb into the LS6? I'm thinking of getting a fast 102 but I'd like to use the LS2 throttle body. The NW stuff is beyond my budget.

Big Bu Bu

iTrader: (4)

I think the 90 was faulty. I used the the same wiring harness on the 102. You're not really making a mistake going with the 90. Performance is almost the same.

lubelizard

iTrader: (5)

Ah the Bosch injectors. I'd like to find out what your duty cycle hits now. I thought the 42s would be a little big for an n/a LS6/2. I like to keep injectors to a size where duty cycle is under control, but not too big as to affect idle and low rpm fueling. I think the LS injector is a high impedence type. When I began running larger injectors on my previous projects, I converted to low impedence because they were able to open and close much more quickly than stock high impedence injectors, thus allowing me to run a rather large injector but still maintain decent idle and cruise rpm fuel control.