[laynlo15]

Travis, what kind of power are you wanting to make and what boost level since you said 15 was too high. If you are using the stock lower your boost would be less then Mikes with the Z06. So I ran the stock lower and 80mm pulley and was at 13-14 psi. I would start with the 90mm and maybe have an 85 available. They are very easy to change so you could actually have a street pulley and track pulley but you would have to have HP tuners to switch tunes. Ted would be a good tuner since he's done several Zl1 2650s now.

[travislambert]

Originally Posted by laynlo15

Travis, what kind of power are you wanting to make and what boost level since you said 15 was too high. If you are using the stock lower your boost would be less then Mikes with the Z06. So I ran the stock lower and 80mm pulley and was at 13-14 psi. I would start with the 90mm and maybe have an 85 available. They are very easy to change so you could actually have a street pulley and track pulley but you would have to have HP tuners to switch tunes. Ted would be a good tuner since he's done several Zl1 2650s now.

I'm not really aiming for a particular horsepower number. I want a reliable setup that I can run on the road course on the hottest summer days without issue. If I had to put a number on it, I'd think 650-700 RWHP would be a good start.

In the summer months with my current setup, my lap times would increase up to a couple of seconds. I figured the improvements of the 2650 would help reduce the IATs to alleviate some of this hot weather slowdown. I know I could also run higher octane fuel and adjust the temperature modifier tables, but I prefer to stay with 93 and keep a good safety margin in the tune.

For the boost, I'm thinking 11-13 psi. I certainly don't want to run into cooling issues.

I have HP Tuners, so switching tunes wouldn't be an issue. The main reason I care about picking the correct pulley is dyno time in my area isn't always easy to get. I waited for months to get my SS on the dyno. I don't want to finally get the car on the dyno only to discover I need to order a new pulley to get the boost where I want it. I'd much prefer to get it right the first time, which shouldn't be hard to do, but there's a lot of conflicting information out there. It'd be really nice if Magnuson would have some sort of published baseline for the different pulleys.

[laynlo15]

Sienar did close to those numbers on our stock Zl1 tune with 91 octane. Just the mods you have listed would get you to your goal on 93 octane pretty easily.

[SienarSystems]

Yes, I was at 640.7 with one modification - the 2650. Stock everything else and a 90mm pulley.

[toohighpsi]

Originally Posted by laynlo15

Hey Travis, do you still have the stock lower or a larger ATI? If I remember correctly Toohighpsi may have had larger lower which would be a higher PSI then yours would be with the stock lower.

I have a 5% over lower pulley, but I'm running a custom upper pulley (~95mm) which gives the same ratio as a stock lower and 90mm upper.

Remember I'm completely stock, cats, exhaust etc.

If you're running the stage 2 front cooler system, you won't have any cooling issues with a ZL1 at 15psi.

[JANNETTYRACING]

Originally Posted by travislambert

Does anyone have a HP Tuners tune file for a 2650 on a manual transmission 6th gen ZL1? (I won't bug you with questions. I'm just curious what all needs to change.)

Anyone use a Mighty Mouse catch can with a 2650 on a road course?

If you have a Magnuson 2650 on an LT4, please post your lower and upper pulley size along with the peak boost. Any other relevant details are also appreciated.

Hello Travis, I specialize in buidling cars for road racing, please feel free to call to discuss your build.

I use and stock all of the parts in question.

I can remote tune it no dyno needed we can log runs on the road coarse and tune to the way you use it.

203-753-7223

Ted.

[GunMetalGrey]

Originally Posted by travislambert

I have sticky tires. I just neglected to list them. I've ran a 315/345 Hoosier R7 setup, but I've found I actually like the Goodyear Supercar 3Rs better.

Im interested to know why you liked the SC3R’s more than the R7’s?

[travislambert]

Originally Posted by GunMetalGrey

Im interested to know why you liked the SC3R’s more than the R7’s?

The R7s are only faster than the G3Rs for about 1-2 heat cycles during the life of the tire. The R7s peak and then fall off quite a bit. If you get stuck behind some traffic during that narrow window while the tires are their best, well, that's pretty unfortunate.

I get a lot more fast laps from the G3Rs. The average grip throughout the life of the tire seems much better than the R7s. Once the cost of the tires is brought into the equation, it's a no-brainer for me.

[GunMetalGrey]

Originally Posted by travislambert

The R7s are only faster than the G3Rs for about 1-2 heat cycles during the life of the tire. The R7s peak and then fall off quite a bit. If you get stuck behind some traffic during that narrow window while the tires are their best, well, that's pretty unfortunate.

I get a lot more fast laps from the G3Rs. The average grip throughout the life of the tire seems much better than the R7s. Once the cost of the tires is brought into the equation, it's a no-brainer for me.

Thanks, Makes sense.

And how many track sessions or track days are you getting out of each set of the R7’s and SC3R’s? Do you drive hard and is your track tough on tires?

Not trying to hijack the thread, but very interested in your experience with the tires since I’m going to be using them this upcoming track season. Thanks again.

[travislambert]

Originally Posted by GunMetalGrey

Thanks, Makes sense.

And how many track sessions or track days are you getting out of each set of the R7’s and SC3R’s? Do you drive hard and is your track tough on tires?

Not trying to hijack the thread, but very interested in your experience with the tires since I’m going to be using them this upcoming track season. Thanks again.

For me, the tire life seems comparable between the R7s and SC3Rs. At PittRace, I'll take a set of front tires from new to corded in a weekend (10-12 sessions). The life of the rear tires is roughly double the life of the front.

"Driving hard" is subjective. Here's a video.

You won't be disappointed with either tire, but I honestly like the SC3Rs a little better for HPDEs. Even if the cost were the same I'd buy SC3Rs.

[gtfoxy]

Originally Posted by travislambert

For me, the tire life seems comparable between the R7s and SC3Rs. At PittRace, I'll take a set of front tires from new to corded in a weekend (10-12 sessions). The life of the rear tires is roughly double the life of the front.

"Driving hard" is subjective. Here's a video.

You won't be disappointed with either tire, but I honestly like the SC3Rs a little better for HPDEs. Even if the cost were the same I'd buy SC3Rs.

That looks like a riot!

Wish they had stuff like that by me.

[GunMetalGrey]

Originally Posted by travislambert

For me, the tire life seems comparable between the R7s and SC3Rs. At PittRace, I'll take a set of front tires from new to corded in a weekend (10-12 sessions). The life of the rear tires is roughly double the life of the front.

"Driving hard" is subjective. Here's a video.

You won't be disappointed with either tire, but I honestly like the SC3Rs a little better for HPDEs. Even if the cost were the same I'd buy SC3Rs.

Thanks for that info and the video, that track has a fair bit of corners on it for sure. Glad to know you are getting 10 to 12 sessions on the fronts, as long as I can get 2 days worth (8 to 10 sessions) at my corner heavy track I’ll be happy.

Almost forgot to ask, what camber are you running at?

[BlaqWhole]

Originally Posted by SienarSystems

Yes, I was at 640.7 with one modification - the 2650. Stock everything else and a 90mm pulley.

This is my plan for the Summer. Just the blower swap, tune, 93 octane, and 2" LTs. For now that is. I plan to take it further in the future.

[KingLT1]

Originally Posted by SienarSystems

Yes, I was at 640.7 with one modification - the 2650. Stock everything else and a 90mm pulley.

Looks to me like the 90mm is too large of pulley for the 2650...it's being under driven. You will likely have to shift around 7-7200rpm to stay up in good power.