Newbie wants to race... But what class??
 

This is my first post am I'm diving right in...

I currently own a 2004 Silverado and want to enter into a IHRA Class. I want to run for fun and I want to get involved in this sport and learn more.

I have looked into all the classes and sub classes and I'm a little confused where I stand.
This is my current set-up as follows.

2004 Silverado 2wd Regular Cab Short Bed

Removed the Factory 5.3L for the following:
6.0L 366ci Iron Block (2003 LQ4 Block)
LS2 Pistons and Rods (06 Corvette)
L92 Heads (07 Denali)
LS3 Intake (09 Camaro)
90mm DBW Throttle Body (06 Corvette)
32# Injectors (Stock L92)
255LPH Fuel Pump (Aftermarket)
Custom Cam (Aftermarket)

4.10 Gears with TruTrack Locker (Came with 3.73 and crappy limited slip)
Hardened push rods
Pacesetter Long Tube Headers
True Dual 3" w/"H" Pipe
Dynomax Muffler
Factory Electric Cooling fans w/34" Radiator (Factory in 05)
HP Tuners (Tuned by Me)
Transmission Cooler W/Fan


Planning in the near future:

Built 4L60E Transmission
3000 RPM Stall Converter
Possibly a 4-Link with Coil Over (unless a major class changer)
Also thinking of a Bore and Stroke up to a 408 or a few years down the road with a LSX 454 (Dreaming of a 454SS Silverado Re-Make really)





I read through the rule book a few times and I can't figure where I would fit in well. I guess that I would run high to mid 12's in this 4500# Truck with traction.



What do you think? Class?
or would it be worth it for me, or should I stick to the Street Nights with all the ricers...

Opinions Please!




http://memimage.cardomain.com/ride_i...053_medium.jpghttp://carphotos.cardomain.com/ride_...069_medium.jpghttp://carphotos.cardomain.com/ride_...066_medium.jpg

Re: Newbie wants to race... But what class??
 

Are you thinking of running it in Stock or Super Stock?I don't see the '04 Silverado in the NHRA Classification Guide, so it would not be eligible for NHRA. IHRA (to my knowledge) doesn't have an online version of the Guide. They may accept some combinations as legal.

Was the 6.0 engine you installed available from the factory in the '04 Silverado? If not, the truck will not be eligible for Stock. Not sure what all replacement parts are allowed (LS-2 pistons, etc don't sound legal). The camshaft would have to meet factory lift specs (or .430 lift, whichever is bigger). 4 links are not allowed in Stock It doesn't sound like your truck would be eligible for any Stock or Super Stock classes. Probably would have to run in Pro in brackets, or maybe Hot Rod if it can run 10.90 1/4 mile (7.00 1/8 mile) and has all the safety requirements. Your best bet at an IHRA Divisional race right now would be to run No Box or Street ET.

Re: Newbie wants to race... But what class??
 

If you wanted to run Stock, there are truck classes for factory trucks. Crate Motor Stock is also an option, using one of several IHRA-approved Crate motors. Both Stock Truck and Crate Motor Stock are for 1/2 ton or smaller trucks.

From the IHRA website:

http://www.ihra.com/competition/pistons.php Accepted Replacement Pistons

http://www.ihra.com/downloads/pdf/co...ateengines.pdf

Re: Newbie wants to race... But what class??
 

Here is the link that I found for the rule book.
http://www.mydigitalpublication.com/...ion?m=1203&l=1

Are you thinking of running it in Stock or Super Stock? Not Sure
Was the 6.0 engine you installed available from the factory in the '04 Silverado? It came from the 2500
The camshaft would have to meet factory lift specs (or .430 lift, whichever is bigger). I'll have to go back to the stock cam (could I run a factory cam from other years?)
4 links are not allowed in Stock It doesn't sound like your truck would be eligible for any Stock or Super Stock classes. 4-Link is out then
Probably would have to run in Pro in brackets, or maybe Hot Rod if it can run 10.90 1/4 mile (7.00 1/8 mile) and has all the safety requirements. 10.9... thats a no (I wish)
Your best bet at an IHRA Divisional race right now would be to run No Box or Street ET


Could I compete in those classes, or would I be an anchor and waste time to other drivers in the class? I just want to fit in a class that would welcome my ride.

Re: Newbie wants to race... But what class??
 

I looked at the Crate class, and it looks like the only LS motor allowed is the LS1, which is smaller (ci wise), more expensive, and an aluminum block (again more expensive). The approved LS1 pistons are only for the smaller bore LS1 not the 4" bore LS2 or LQ9 Pistons.

I'll look more at the truck class...

Re: Newbie wants to race... But what class??
 

"Camshaft must retain stock lift for horsepower claimed, per IHRA Tech Bulletins". You can use aftermarket cams (Crane, Comp Cams, etc), as long as the factory lift is met, but not exceeded. Any duration is permitted (I believe). Stock Trucks "maximum lift limited .430 or OEM, whichever is greater".

If you run Pro, Street, No-Box, it's just a dial-in bracket race, so yeah, you can run just about anything. Even slower street cars. My first street car that I bracket raced was an eighteen second Olds Cutlass. Some basic safety items will be checked (battery is secure, minimum of a one pint overflow tank, etc).

Re: Newbie wants to race... But what class??
 

Here are some people to contact, to see if an '04 Silverado is eligible for Stock. If not, most all IHRA Divisional Pro-Am races offer Box and No-Box ET bracket classes.

http://www.ihra.com/competition/index.php#contact

Re: Newbie wants to race... But what class??
 

I know bracket racing, but what is "box" and "no-Box"?

Thanks for your time, Mike

I'll send them an e-mail

Re: Newbie wants to race... But what class??
 

Box allows Delay Boxes. No-Box does not allow delay boxes. Different classes go by different names at different tracks. ET 1, Super Pro, Electronics, Box are usually the same. Pro, No-Box, ET 2, Modified same thing. Most tracks (but not all IHRA Pro-Ams) offer Street ET also. Most classes have a maximum ET that you can dial-in. Box might be no slower than 11.99, No-Box might be no slower than, say, 13.99 or 14.99. Street ET is usually no ET limit, though some I have seen are now slower than 17.49, or 19.99.

Re: Newbie wants to race... But what class??
 

Oh, I got you.
I raced a Bracket at a Truck Nationals event and it was a delay box. Not a fan, I lost due to a major padding of time in the other lane and some light braking. I raced all out... I still had fun.

Wow 17.49... The truck with the 5.3L (100% Stock) got a best of 15.2 in the 1/4 @93mph

Re: Newbie wants to race... But what class??
 

If you're running 15's, you will be fine in Street, and maybe Pro at some races. Rules, as far as maximum/minimum allowable dial-in ET, safety, what electronic aids (Delay Box, air/electric shift, two-step, transbrake, etc) may/may not be allowed by class vary by track. Best bet before going to a race somewhere is to call or check the track website for what classes are offered, rules, etc. Also, FYI, if you come here tomorrow and don't see this thread, chances are it was moved to the "Stock and Super Stock Tech" Forum on here.

Re: Newbie wants to race... But what class??
 

Beef up the suspension on the truck and use it as a tow vehicle and buy a low dollar lower class car....and there's plenty.....get a trailer and go racing!

JimR

Re: Newbie wants to race... But what class??
 

Jim, I really enjoy the LS Engines and the GM Trucks. I know everything thats gone into the truck (bought it brand new) and I really have a passion for getting this boat down the 1/4 mi.
I'm sure i could get a low dollar, lower class car, but I don't want to fit in, I just love the feeling of beating cars in a pick-up truck (I'm sure I'm the slowest on this site, with mods, guessing @ high 12's to low 13's).
I thank you for your suggestion, but I am going to start here with the truck, and hopefully some day years down the road, I will slowly progress into other classes with it and continue to have a great time doing it.

Steve B in NH

Re: Newbie wants to race... But what class??
 

If I have the HP correct the LS1 CM is rated at 350. Now if you were to run I/CM the index would be a 12.10 and you would have to weigh no less then 3670lbs. 3670 - 170 / 350 = a weight brake of 10 which is I/CM. Do you think you can make a LS1 run a 12.10 or better while keeping your truck at 3670lbs(with driver) or higher and following all the rules of SE?

Hope this helps.

Re: Newbie wants to race... But what class??
 

Would this cover all LS Series V8's? Or only the LS1?
The LS7 is a 427 making 500hp
The LSX 454 is making 600+hp
But, My Motor is NOT the LS1 it is essentially a LQ9 rated @ 245hp for the 04 Year(Came in the Silverado SS)

Would I use this # Instead?

I would probably want to be into the J or K Class since I think I would run between a mid 12 to low 13. And my weight as it sits right now is 4600 with driver. Soo...

4000lbs (with major weight reduction) - 170lbs / 350 = 10.94 Which puts me in the J/CM Class.

I think I can do 12.5 - 12.99 and compete.


Not yet anyway.
No Problem keeping the truck above 3670#'s!!!


I'll have to go through the rules to see. I'll let you know.

Re: Newbie wants to race... But what class??
 

Must follow this and it looks like it may be rated at 320.
http://www.ihra.com/downloads/pdf/co...stockspecs.pdf

Re: Newbie wants to race... But what class??
 

Just so I understand....
I class, based on the STOCK 320 HP, but as long as I follow the Class rules, I can modify the HP anount as much as I want?

In the early learning stages, Thanks

Re: Newbie wants to race... But what class??
 

Yes. Shipping weight divided by factory (or NHRA/IHRA HP rating equals the weight break for your natural class. Using my car as an example. 1992 Olds Toronado Trofeo. 3,444 pounds factory shipping weight. 170 HP rating from the factory, 170 rating by NHRA. 3444/170 = 20.258, rounded up to 20.26. That puts me in DF/S (D Front wheel drive/Stock). You use the 170, in my case, to determine the minimum weight in each class it's eligible for (which is C, D and E/FS). You can add/subtract weight to do this, either subtract weight to move to the top of it's natural class (DF/S), into CF/S, and add weight to drop to EF/S. Top of D is 19.00 pounds per factored HP. So 19 x 170 + 170 (driver weight) = 3,400. (170 is a driver weight, added to all cars, to determine minimum weight. If a driver weighs less than 170, they will have to add ballast to make the 'HP x weight break + 170 = Class Minimum Weight' formula, and can take out ballast if they weight more than 170) You will always use the NHRA/IHRA horsepower rating to determine Class and Weight, regardless of what HP the engine makes on an engine/chassis dyno.

If the factory shipping weight of your truck is 4,500 pounds, and you use the 320 HP crate motor, 4,500 divided by 320 = 14.06. M/CM is the lowest classed CM class, for vehicles with a weight/HP ratio of 12.00-12.49 pounds per HP. I believe, by rule, you can still run M/CM, but you would be at a pretty large disadvantage. You would be better off to use a higher-rated Crate Motor, to get your truck into the 12.00-12.49 range.

Re: Newbie wants to race... But what class??
 

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