Need some help deciding on slicks... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

lowriden58 · 05-24-2008, 03:45 PM

Alright guys im trying to decide if i wanna get 29.5x10.5 or 28x10.5 ET Drags. Ive posted up my dyno results before 300rwhp on motor. BUT i do plan on 200shot of NX in the very near future. which should i get? 355 with a th350, 3k stall, 4.10 gears and im gonna shift at 6500. I just think with a 28 i might run out of gear on spray

Marv D · 05-24-2008, 04:54 PM

low,, what kind of rpm's are you turning now through the traps? (with what tire your running now?)

Or you can look at it this way. A 200 HP shot might give you a .5 or .75 second improvment,, )more if your currently running 14's less if your currently running 10's obviously) Let's assume with 300 RWHP your going to turn mid 12's, with the 200shot mid 11's. A typical mid 12 second ride is going to be in the 110-115mph range. 115mph with a 10% loss through the convertor, a 28" tire and 4.10 gears will put you at about 6200rpm in the traps. If you were really light and quick already and trip the timers at a mid 10 (and typically around a 122-128mph) you would be at 6700 with the short 28" tires. My thought is,,, if you have a 350 tolerant of a 200 horse shot, you surley have a 350 capable of 6700rpm, or even 7000. Then your only problem becomes gear multiplication on the starting line putting so much leverage on the available traction, that you blow the tires off.

Taller wider tires will help your statring line traction and make chassis tunning a little easier (simply because your not overpowering the tires). Myself, I'd start with the taller tire and add more power as needed to run on the ragged edge

lowriden58 · 05-24-2008, 05:04 PM

well tonight will be the first pass ever in this truck. never can get traction on street tires on the street. i plan to pickup my slicks at lunch time

might just go with the 28s. worse case is i gotta sell them to a coworker

Couch · 05-24-2008, 05:41 PM

sounds like your setup is identical to mine.same gear,stall, engine,trans, everything. i went 12.1 with all of that on spray,with a 28'' tall tire. worked awesome, dint run outta gear, i trapped just under 5000 rpm. good luck.

lowriden58 · 05-24-2008, 06:01 PM

Quote:

Originally Posted by Couch

sounds like your setup is identical to mine.same gear,stall, engine,trans, everything. i went 12.1 with all of that on spray,with a 28'' tall tire. worked awesome, dint run outta gear, i trapped just under 5000 rpm. good luck.

on how much N20?

Couch · 05-26-2008, 09:37 AM

my shot gave me an extra 150 wheel on the dyno

Super73 · 05-26-2008, 08:48 PM

Couch,

He is already going faster that you NA to NA. I think his best was a 12.8 at like 103mph. 200 on top of it, I'd guess 117-120mph once he is fully dialed and on the spray..

Couch · 05-26-2008, 11:37 PM

true,i cant figure out why mine traps as low as it does on motor.somethings up with it only pulling 89 mph on motor

Super73 · 05-27-2008, 02:49 AM

Weight? Converter?

Couch · 05-27-2008, 11:18 AM

not to hijack a the thread. but 3500 lbs and 3k stall. want to have it reweighed cause i think it might be heavier then 3500

05-24-2008, 03:45 PM	#1
lowriden58 Registered User Join Date: Jan 2008 Location: Chesapeake Beach, MD Posts: 812	Need some help deciding on slicks... Alright guys im trying to decide if i wanna get 29.5x10.5 or 28x10.5 ET Drags. Ive posted up my dyno results before 300rwhp on motor. BUT i do plan on 200shot of NX in the very near future. which should i get? 355 with a th350, 3k stall, 4.10 gears and im gonna shift at 6500. I just think with a 28 i might run out of gear on spray __________________ 71 cheyenne lwb 300rwhp best 1/4 time so far 12.8 @103 http://i195.photobucket.com/albums/z...en58/001-2.jpg Last edited by lowriden58; 05-24-2008 at 04:28 PM.

05-24-2008, 04:54 PM	#2
Marv D Registered Truck Offender Join Date: May 2008 Location: hells training ground (aka Ariz) Posts: 3,118	Re: Need some help deciding on slicks... low,, what kind of rpm's are you turning now through the traps? (with what tire your running now?) Or you can look at it this way. A 200 HP shot might give you a .5 or .75 second improvment,, )more if your currently running 14's less if your currently running 10's obviously) Let's assume with 300 RWHP your going to turn mid 12's, with the 200shot mid 11's. A typical mid 12 second ride is going to be in the 110-115mph range. 115mph with a 10% loss through the convertor, a 28" tire and 4.10 gears will put you at about 6200rpm in the traps. If you were really light and quick already and trip the timers at a mid 10 (and typically around a 122-128mph) you would be at 6700 with the short 28" tires. My thought is,,, if you have a 350 tolerant of a 200 horse shot, you surley have a 350 capable of 6700rpm, or even 7000. Then your only problem becomes gear multiplication on the starting line putting so much leverage on the available traction, that you blow the tires off. Taller wider tires will help your statring line traction and make chassis tunning a little easier (simply because your not overpowering the tires). Myself, I'd start with the taller tire and add more power as needed to run on the ragged edge __________________ Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral. Last edited by Marv D; 05-24-2008 at 04:57 PM.

05-24-2008, 05:04 PM	#3
lowriden58 Registered User Join Date: Jan 2008 Location: Chesapeake Beach, MD Posts: 812	Re: Need some help deciding on slicks... well tonight will be the first pass ever in this truck. never can get traction on street tires on the street. i plan to pickup my slicks at lunch time might just go with the 28s. worse case is i gotta sell them to a coworker __________________ 71 cheyenne lwb 300rwhp best 1/4 time so far 12.8 @103 http://i195.photobucket.com/albums/z...en58/001-2.jpg

05-24-2008, 05:41 PM	#4
Couch Daily Driver Join Date: Jul 2007 Location: fresno,ca Posts: 228	Re: Need some help deciding on slicks... sounds like your setup is identical to mine.same gear,stall, engine,trans, everything. i went 12.1 with all of that on spray,with a 28'' tall tire. worked awesome, dint run outta gear, i trapped just under 5000 rpm. good luck. __________________ nitrous...the equal opportunity destroyer.

05-26-2008, 09:37 AM	#6
Couch Daily Driver Join Date: Jul 2007 Location: fresno,ca Posts: 228	Re: Need some help deciding on slicks... my shot gave me an extra 150 wheel on the dyno __________________ nitrous...the equal opportunity destroyer.

05-26-2008, 08:48 PM	#7
Super73 Registered User Join Date: Nov 2007 Location: Bay Area, Ca Posts: 2,841	Re: Need some help deciding on slicks... Couch, He is already going faster that you NA to NA. I think his best was a 12.8 at like 103mph. 200 on top of it, I'd guess 117-120mph once he is fully dialed and on the spray.. __________________ ------Motor---------------Bottle 60'---1.53---------------1.41 1/8---6.58 @ 105.92----5.87 @ 118.41 1/4---10.38 @ 126.97----9.24 @ 142.49 Last edited by Super73; 05-26-2008 at 08:49 PM.

05-26-2008, 11:37 PM	#8
Couch Daily Driver Join Date: Jul 2007 Location: fresno,ca Posts: 228	Re: Need some help deciding on slicks... true,i cant figure out why mine traps as low as it does on motor.somethings up with it only pulling 89 mph on motor __________________ nitrous...the equal opportunity destroyer.

05-27-2008, 02:49 AM	#9
Super73 Registered User Join Date: Nov 2007 Location: Bay Area, Ca Posts: 2,841	Re: Need some help deciding on slicks... Weight? Converter? __________________ ------Motor---------------Bottle 60'---1.53---------------1.41 1/8---6.58 @ 105.92----5.87 @ 118.41 1/4---10.38 @ 126.97----9.24 @ 142.49

05-27-2008, 11:18 AM	#10
Couch Daily Driver Join Date: Jul 2007 Location: fresno,ca Posts: 228	Re: Need some help deciding on slicks... not to hijack a the thread. but 3500 lbs and 3k stall. want to have it reweighed cause i think it might be heavier then 3500 __________________ nitrous...the equal opportunity destroyer.



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