Dynod the Viper today...

[CraigRT]

i know this might be stating the obvious but I have to ask, is there a button to disable traction control? because I can't fathom 500hp not being able to light up the tires.

either that, or you have some super sticky and fat tires

A Viper's rear tires are something like 13" wide. One of the widest tires ever on a car when they came out in the 90's. They are definitely some fat meat.

 

[Throckmorton]

Idk, lol. I figure all modern cars have them to please the lawyers...

Viper is definitely not a modern car, that's the appeal of it. I guess the new one will have TC though.

 

[skyking]

Why don't you do track days? That should be more fun than burnouts

All the more reason for the gear change. Typical track day in his viper, stock:

1,2,1,2,1,2,1,2

It would be nice to get into 3rd

 

[Viper GTS]

335s in the back... almost 13 1/4". Brand new recent manufactured PS2s, all kinds of grip.

And for the critics - I'm not looking to do burnouts (it will do that fine as is), I just think it needs a little more punch when you floor it. I'm having poly bushings put in at the same time, hoping for good things from those too.

If my schedule allows it will see track time this year. although I have heard rumors PIR is now requiring roll cages for non hardtop cars... not sure that's going to happen so we will see.

Viper GTS

 

[manimal]

Wait, you're gonna have your own dyno?

Its in the plans and I have room ready for it. Looking at 4wd of course. Its in our business plan but its gonna be a little while yet. Of course I am going to have a free dyno night for ATG members when we get it.

 

[manimal]

335s in the back... almost 13 1/4". Brand new recent manufactured PS2s, all kinds of grip.

And for the critics - I'm not looking to do burnouts (it will do that fine as is), I just think it needs a little more punch when you floor it. I'm having poly bushings put in at the same time, hoping for good things from those too.

If my schedule allows it will see track time this year. although I have heard rumors PIR is now requiring roll cages for non hardtop cars... not sure that's going to happen so we will see.

Viper GTS

All the local tracks here require cages or a mnf solution like the boxster. The last holdout had a guy in a cobra flip I had heard so they are cage onry.

 

[skyking]

335s in the back... almost 13 1/4". Brand new recent manufactured PS2s, all kinds of grip.

And for the critics - I'm not looking to do burnouts (it will do that fine as is), I just think it needs a little more punch when you floor it. I'm having poly bushings put in at the same time, hoping for good things from those too.

If my schedule allows it will see track time this year. although I have heard rumors PIR is now requiring roll cages for non hardtop cars... not sure that's going to happen so we will see.

Viper GTS

Looking at the dyno run, it is clear that most times you won't be exploring the 145 MPH end of the spectrum, so you want gearing that is more optimized for reality

 

[overst33r]

Looking at the dyno run, it is clear that most times you won't be exploring the 145 MPH end of the spectrum, so you want gearing that is more optimized for reality

That's what gears 1-3 are for. The dyno run was made in 4th based on the graph.

Chrysler took the same approach with the 2013 Viper (as OP will take) and made the Final Drive 3.55. I believe the stock ratio is 3.07.

I say just go for 3.73, that way you can stay in 4th for the quarter mile.

http://www.viperclub.org/howto/faqs/what-are-the-benefits-of-a-rear-gear-swap.php

Rear Gear 1st 2nd 3rd 4th 5th 6th
3.07 58 76 114 151 204* 302*
3.31 54 70 105 140 189 280*
3.54 50 66 99 131 177 262*
3.73 48 63 94 124 168 249*
4.10 44 57 85 113 153 226*

 

[Ferzerp]

The one dyno graph I've seen on the challenger tuned (since there is finally a shop capable of doing the tunes) comes out to 447HP 453tq on the auto. Not bad for having 1.6-2.0L less than you have (is yours 8.0L or 8.4L?)

Now to somehow cut half a ton off my challenger....

 

[Gillbot]

I am putting 4:10's in my Mustang (up from 3:55), to try and get the WOW factor back. I hope it works for both of us.

I have 3.42's in my Camaro, I have a rear setup with 4.10's to swap in after I make a few track days and get the feel of it. Not sure i'll like them though, might make 1st gear too short and basically useless. 60's will be awesome though.

A Viper's rear tires are something like 13" wide. One of the widest tires ever on a car when they came out in the 90's. They are definitely some fat meat.

335 series probably, so they are over 13" IIRC. 275 series is just under 11", 315 series is just shy of 12.5".

 

[Viper GTS]

Just got this from the shop:

The factory exhaust on your viper has been welded together in all the points where a slip joint should be. That being said we cannot get the rear end out of the car without cutting down your exhaust and then doing a vband flange to reinstall it back into the vehicle. We estimate 3-4 hours of fabrication and then we assume 2 vband assembles are needed at 94$ each. Fabrication is $80 per hour so roughly $428-$508 total depending on number of flanges necessary. Should I go ahead and keep moving forward with this?

Does that sound reasonable? I don't think the exhaust on it is stock, surely there is a reason it is welded? Is it likely it can be removed in one piece and reattached when done?

Viper GTS

 

[brainhulk]

Just got this from the shop:

The factory exhaust on your viper has been welded together in all the points where a slip joint should be. That being said we cannot get the rear end out of the car without cutting down your exhaust and then doing a vband flange to reinstall it back into the vehicle. We estimate 3-4 hours of fabrication and then we assume 2 vband assembles are needed at 94$ each. Fabrication is $80 per hour so roughly $428-$508 total depending on number of flanges necessary. Should I go ahead and keep moving forward with this?

Does that sound reasonable? I don't think the exhaust on it is stock, surely there is a reason it is welded? Is it likely it can be removed in one piece and reattached when done?

Viper GTS

pfffft, who needs a stupid muffler anyway?

 

[Gillbot]

$400-500 to drop an exhaust? That seems silly to me, but i'm also so cheap I'd be there with my own cutoff wheel and clamps to take care of it.

Personally, I can't see where they are getting 4-5 hours for this. Unless i'm missing something, 10 minutes with a cutoff wheel and a clamp should be fine. I mean, they could fab an entire catback in 4-5 hours. Maybe you could ask them for info of what they want done then take it to an exhaust shop for a retro fit at a much lower cost.

 

[AMCRambler]

Just got this from the shop:

The factory exhaust on your viper has been welded together in all the points where a slip joint should be. That being said we cannot get the rear end out of the car without cutting down your exhaust and then doing a vband flange to reinstall it back into the vehicle. We estimate 3-4 hours of fabrication and then we assume 2 vband assembles are needed at 94$ each. Fabrication is $80 per hour so roughly $428-$508 total depending on number of flanges necessary. Should I go ahead and keep moving forward with this?

Does that sound reasonable? I don't think the exhaust on it is stock, surely there is a reason it is welded? Is it likely it can be removed in one piece and reattached when done?

Viper GTS

There's no way that it shouldn't drop off the car. You can't weld exhaust pipes all the way around when they're on the car. Unless they had slip joints and put spot welds on them, but then your garage should be able to grind off the spot welds. It doesn't sound quite right to me.

Also $100 for an exhaust clamp is a major rip off. Band clamps go for 10 bucks max.

http://www.summitracing.com/parts/WLK-33240/

I don't know what makes a vband clamp so special, but I guarrantee you don't need it.

 

[alkemyst]

you can weld an exhaust completely around on many cars...don't know where you got that from.

 

[jlee]

There's no way that it shouldn't drop off the car. You can't weld exhaust pipes all the way around when they're on the car. Unless they had slip joints and put spot welds on them, but then your garage should be able to grind off the spot welds. It doesn't sound quite right to me.

Also $100 for an exhaust clamp is a major rip off. Band clamps go for 10 bucks max.

http://www.summitracing.com/parts/WLK-33240/

I don't know what makes a vband clamp so special, but I guarrantee you don't need it.

V-band clamps are far superior. Example

$400-500 to drop an exhaust? That seems silly to me, but i'm also so cheap I'd be there with my own cutoff wheel and clamps to take care of it.

Personally, I can't see where they are getting 4-5 hours for this. Unless i'm missing something, 10 minutes with a cutoff wheel and a clamp should be fine. I mean, they could fab an entire catback in 4-5 hours. Maybe you could ask them for info of what they want done then take it to an exhaust shop for a retro fit at a much lower cost.

Yeah, I had a cat installed with the exhaust still on the car and they did it in about 45 minutes. That was cutting the exhaust, cutting the cat, and welding it all back together.

 

[Throckmorton]

A lot of the time the exhaust is rusted together anyway so they have to cut. Or they hammer, and you never really know if they're messing up your seals or not.

 

[Gillbot]

you can weld an exhaust completely around on many cars...don't know where you got that from.

Really depends on the car. We don't know the situation on the OP's car for certain so only he can say, or the shop. Overall, I think 400-500 is a bit much for what they are proposing. That's why I suggested an exhaust shop where they are used to doing stuff like this as opposed to a performance shop that wants to nickle and dime you on "fabrication" work.

 

[IcePickFreak]

Yeah seems like they got quite a bit of time allotted for labor for that kind of job.

Its in the plans and I have room ready for it. Looking at 4wd of course. Its in our business plan but its gonna be a little while yet. Of course I am going to have a free dyno night for ATG members when we get it.

:thumbsup:

 

[Viper GTS]

They're sending me pictures but I am leaning towards taking it elsewhere to resolve the exhaust issues, then coming back for the differential.

Viper GTS

 

[alkemyst]

Really depends on the car. We don't know the situation on the OP's car for certain so only he can say, or the shop. Overall, I think 400-500 is a bit much for what they are proposing. That's why I suggested an exhaust shop where they are used to doing stuff like this as opposed to a performance shop that wants to nickle and dime you on "fabrication" work.

My only problem is those exhaust shops tend to do things more akin to what you'd see on a 1975 F150 than a performance car.

You usually get what you pay for.

I'm really to assume you would argue with a fence post...?
This is a southern way of saying "quit trolling"...

AT Moderator
Bartman39

 

[Gillbot]

My only problem is those exhaust shops tend to do things more akin to what you'd see on a 1975 F150 than a performance car.

You usually get what you pay for.

Once again, stereotyping and generalizing is stupid. There are many "exhaust shops" that can do good work on ANY car. I didn't say take it to Midas or the cheapest place out there.

When I was in Dayton there was a small local shop that had many high end cars in there for "exhaust work" only, because performance shops would over charge for that type of work. When I wanted a simple cat converter replacement, most performance shops wanted to charge $300+ based on typical labor rate even if I brought them the cat to install. He charged me $50 and took him all of 30 minutes, most of that was getting the car in the air.

 

[AMCRambler]

you can weld an exhaust completely around on many cars...don't know where you got that from.

Unless you can access the top of the exhaust pipe its going to be darn near impossible. I'd bet money a Viper has those pipes tucked up so far that this would be impossible. Proof is in the pudding though. Show us some pics.

 

[AMCRambler]

Ahh, here we go.

http://www.afterhoursautomotive.com/Viper-gen-3-4-sport-exhaust.html

Yeah. Weld that with it on the car.

 

[alkemyst]

Unless you can access the top of the exhaust pipe its going to be darn near impossible. I'd bet money a Viper has those pipes tucked up so far that this would be impossible. Proof is in the pudding though. Show us some pics.

LoL, most exhausts get welded together on the vehicle. It think you are guessing.