Which would you do first?

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Jan 26, 2010 | 05:16 PM

#21

Stevo92z28

Thread Starter

Melting Slicks

Joined: Apr 2007

Posts: 2,107

Likes: 4

From: Northern VA

Quote:

Originally Posted by PRE-Z06

an aluminum flywheel will reduce rotating mass and maybe pick up a tenth (I'll have results in about 2 weeks) but the gears will pick up atleast .3 with mn6 and take some of the strain of the clutch if it's still holding up, if both are out of the question

That wouldn't be worth the labor unless i was in there already replacing the clutch. I'm sure my car would like a new slave while i was in there but all that will remain stock unless i do a clutch. You bring up a good point about less strain on the clutch didn't really think of it.

Quote:

Originally Posted by clemsondave

I switched from ET Streets to Hoosier DR's (first time was at the Smackdown). The ETS were very good, but I like the Hoosier's better.

Hard to say which will pick up more. If you clutch is not slipping much, then gears will definitely help a ton. Where are you crossing the stripe? 5600 or so? I know I'm leaving a ton on the table crossing at 6100. Not only do you gain in 4th gear, you pick up RPMs in every gear.

The risky move would be gears first. Of course, if the clutch starts to go, you will not have a choice except to replace it. The safer(and probably smarter) move would be the clutch first. However, it's one of those painful mods that will not be a lot of ET for the buck. IMHO, clutch first.

I would say closer to 5400-5500 not sure off the top of my head. After hearing all these reviews i will go with a hoosier DR when i'm due for some. Smarter would be a clutch figuring that is a wear item, but i'm thinking short term. It still gets the job done so maybe i should just stay with it. I just want the ET then i'll probably sell the car. I have no idea at this point if i'm going to keep the car that long.

Quote:

Originally Posted by USAFZ06

Steve when I did gears it may have cost me a few hp but I did a MPH overlay...look at how much hp i am up through the MPH range...at 128 mph at the strip i was only going through the traps at 6300(my log only said 121mph at 6300 at the strip so this shows tire diameter difference/growing et streets vs stock 295s on the dyno) thats with Z06 MN12/390s ....go with 390s and hoosiers for a little room to grow or 410s if you dont plan on doing 130 some day with your car....I think if I had hoosiers I would have been closer to 6500...which would be even more ideal...oh well...next car I'll try more stuff

Thanks, good reference. That hp/trq loss doesn't mean much but i never figured in tire growth when we are talking the same size tire. Hoosier would help even more for that. Long term i could always go with a taller DR, it would be an option if i planned on going 130+. Not thinking about that right now though.

Quote:

Originally Posted by 99ZX9R

Pete's running Hoosier radials now, and so is Andrew (they both just bought new sets). Pete was previously running BFGs and Andrew and I were on M/Ts and we all got our PBs and best 60s from the Hoosiers. We all order from the same guy...pm me if you want the info.

I'll let you know when that time comes. Off hand do you recall how much a set of 275/40s go for?

Quote:

Originally Posted by Blu

From a gain stand point the gears are a no brainer. In all likelihood when you start racing the car really hard again that clutch just isn't going to hold over time. So either take the better short term gain and chance the stock clutch or do the clutch now and not worry and wait for the gears when you can afford them. The gain will be minimal by replacing the clutch, but the worry factor with that part failing will be gone for a while.

Oh well i know the clutch will have to go at some point. I feel as one with it right now. I love it, but it's not a long term relationship...

Quote:

Originally Posted by robz

By watching you drive and launch I would go with gears. It will take a little less strain off the clutch on the launch. You won't likely break.

Quote:

Originally Posted by robz

Plus you won't skip a beat with the gears but after the clutch you'll need to restructure your launch.

Thanks Rob, was waiting for you to chime in. Less strain sounds good, i am comfortable with this clutch, so i'm going to go with it until it doesn't hold any longer. It would take quite awhile to learn a new clutch and it's sweet spot.

Quote:

Originally Posted by Capthuff

I agree completely with this statement. With gears your ET will drop and your mph will rise. Bonus is less stress on the stock clutch.

As Marc mentioned, I am on Hoosier 275/40/17 drag radials.

Well it's settled then, gears will be next on the list.

Last edited by Stevo92z28; Jan 26, 2010 at 05:20 PM.

Jan 27, 2010 | 03:51 AM

#22

PRE-Z06

Race Director

Joined: Dec 2006

Posts: 12,396

Likes: 2,912

From: Fort Worth, Texas

Quote:

Originally Posted by USAFZ06

oh and FWIW i hit 4th at about 90-95mph so for reference it looks like im up around 60hp and carry the increased hp all the way until i cross the 1/4 mile line

PREZ06 when are you getting back to the strip?

Track opens Feb 7th weather permitting...FWIW Steve I gained ~.3 when I went to 4.10 and that was with an extra shift to 4th which you already have to make. Over a .1 of the gain was from the 60', I'm curious to see how "low" the stock clutch can go...I know it isn't a direct comparison, but I went 1.54 with a 5k rpm launch. What are you launching at now? I believe you'll see 10's with the addition of the gears!