Drag racing Comanche

[daking]

I know most everyone here does not race their Comanche, in fact I'm sure its at the bottom of the list of things you may do with you truck. 

 

(Back-ground) I have a 2004 4X4 HEMI I race. When I raced it, it had a 550HP 392. Currently has a 600+ 426HEMI. Mostly 1/4 and sand race (300ft). It's fun to race a big truck/ The look on the "fast" car next you is priceless when they get beat. ~12sec in a 6000# 4 door 4X4. 

 

My Comanche has a fully built stroker, with most of the extras. larger CAM, large valve ported head, ported intake, large TB, and so on. I have yet to run it, but my guess is 180HP at the wheels. Does that sound about right? I may supercharge it too. But if it makes ~300HP crank, and weighs in at around 3000#, then its Power to weight is near that of my race RAM. So, I would think it may be close. Other variables too, like gear ratio, transmission ratios, shift points, and so on will affect it. Like on my RAM, I program the computer to shift at 6800 to 6850RPM (engine will hit 7000+ before actual shift). It's my understanding, that on these jeeps you can't dial your shift. The shift is based on line pressure and throttle pressure, right? 

 

The jeep was kinda quick when it was a 4X2 5-speed, at least for the first few yards :) . Admittedly, it was scary to drive over 80mph. But I have done a lot to the steering now. I wouldn't expect it to be a top end performer. However, with the low end torque the I6 makes, plus low 4:56 gears and a 4X4 hi launch, I'll bet it will take off like a raped ape. (my 6000# hemi would see sub 2sec 60ft's, 1.80 avg)

 

Truth is, I most likely won't 1/4 mile it, maybe a few times to see what it does, but I did not build it for that. However, I would like to race it in the sand drags. Thats a 300ft straight line through sand. My real plans for jeep are, daily driver, some advanced off-roading, exploring, and general just riding the trails. 

 

I'm just wondering if anyone on here has ever ran the 1/4, just for fun, and what kinda times you saw.    

[ftpiercecracker1]

Why not 1/8th mile?

 

If your open to it, I have a ton of questions for you about your stroker.

[Blue XJ]

I think mine would have a catastrophic failure if I ran it in the 1/4. Even with the low mileage drivetrain it has. I would be curious to see what yours does though, since mine also has a 4.7 stroker and 4.56 gears.

[johnny quest]

https://www.youtube.com/watch?v=7xh_l1JoZA0

[johnny quest]

amc 401 MJ runs 10.71

https://www.youtube.com/watch?v=a0cChk4_g6o

[jimoshel]

I once did a 'little' tune up to the flat head 134 in my '47 CJ2. It was so fast the standard timing clock at the quarter track couldn't time it so I had to run on a 1 mile track.

[big66440]

I live right down the street from Irwindale speedway and have actually thought about making a few runs, but since it's my daily driver I wouldn't feel right breaking something. I doubt I would even get a respectable time also  :laughin: . 

[Comanche County]

For 4x4 launches a 249 with a good VC isn't too bad. I imagine a 242 in full time would be okay, but I'd opt for the 242HD from a WJ for the bigger output shaft.  You'd have to do something different to run a speedo since the WJ doesn't run it off the TC.

[Pete M]

out of curiosity, does this hd242 have a slip yoke or fixed yoke?

[Comanche County]

Slip yoke but its enclosed. 

[Stacks]

daking... I think you are really under rating your horse power.  A basic 4.6l stroker makes about 240-250 at the crank with a stock 4.0l cam and compression ratio.  That equates to about 210hp at the rear wheels depending on what kind of chassis dyno you run it on.  http://www.badasscars.com/index.cfm/page/ptype=product/product_id=64/category_id=13/mode=prod/prd64.htm  My old '67 'Cuda, 180hp per factory rating, with a factory 4spd, 3.23 gears and weighing 2900lbs would run low 16's.   Not real great.  Jump that to the same engine, 273cid, with just over 300hp and it would turn low to mid 13's. Just some info for a possible comparison. ;0)

[daking]

Why not 1/8th mile?

 

If your open to it, I have a ton of questions for you about your stroker.

 

Actually I think you right. 1/8th mile is more realistic. I was saying 1/4, cause that's what the tracks are around here.  But they do show, 60ft, 300ft, 1/8 and 1/4.  (what stroker? the 4.6? Its a Creggs kit, Stage 3 with Keith Black forged pistons and forged crank.The CAM is also Stage3, but they don't show on the web site.  head work done locally. they used  larger Chevy valves. hi-flow oil pump, kool flow water pump, 2000+ ported intake, large ported TB, larger injectors, I think thats about it.. I'll upgrade the rockers later. I may put a supercharger or Turbo in the future ) 

 

Funny posts by some others, :)  I've seen some of those videos where they put in AMC or other V8 engines. Very cool. 

 

On the T-case potential issues. I have found that the T-case on my race RAM is very stout. 4X4 high launches with 550+ plus HP and another 125 Shot on top. (almost 700HP launches) and the case and chain held up. Also I would run in 4X4 Low in the sand drags (no NOS, all motor), and no major transfer-case issues.

 

Now, the case on this jeep is a 231 Alumn Chain drive. not sure on the planetary gears though. I know they make a HD version of the 231, and I think other trucks come with a 231HD and that can be swapped in, right? Currently I have a rebuilt stock case, but in the near future I'll replace that with something beefier. for off-road, with a lower ratio for example. 

 

Well, in a few months when my MJ is driving, I'll hit the track. just to see what it will do. 

 

Thanks

 

 

[Alexia]

The 231HD can not be swapped in due to case differences, but the internal parts can. It is just a six gear planetary instead of a three gear along with a wider chain and gear set.

 

I do launches in Full Time 4WD in the MJ and it holds up. It still needs better tuning though.

[CobraMarty]

My Comanche has a fully built stroker, with most of the extras. larger CAM, large valve ported head, ported intake, large TB, and so on. I have yet to run it, but my guess is 180HP at the wheels. Does that sound about right? I may supercharge it too. But if it makes ~300HP crank, and weighs in at around 3000#, then its Power to weight is near that of my race RAM. So, I would think it may be close.

 

daking... I think you are really under rating your horse power.  A basic 4.6l stroker makes about 240-250 at the crank with a stock 4.0l cam and compression ratio.  That equates to about 210hp at the rear wheels depending on what kind of chassis dyno you run it on.  http://www.badasscars.com/index.cfm/page/ptype=product/product_id=64/category_id=13/mode=prod/prd64.htm

 

Here is some real world Dyno numbers-

 

STOCK 4.0L-

128rwhp/169rwtq corrected*(142rwhp/187rwtq Dynojet) 4.0 Wrangler, stock air intake and filter

133rwhp@4650164rwtq@2650 Dyno-Mite 3rd gear pull '96 177k 5sp 3.73 31"

134rwhp/160rwtq mustang dyno '89 AW4 ported '94 head cam '99+ int Renix header CAI no cat

135rwhp/160rwtq mustang dyno, '99 150k stock

136rwhp/165rwtq corrected*(151rwhp/183rwtq Dynojet) 4.0 Wrangler, NO air intake tube or filter-unrestricted

138rwhp/167rwtq ?dyno '05 Wrangler auto CAI exhaust TB spacer

138rwhp/180rwtq corrected*(153rwhp/200rwtq Dynojet) '00 TJ 5sp MagnumPowers stock

138.3rwhp/172.8rwtq ?dyno stock '00 XJ auto 4wd

138.6rwhp/176.0rwtq ?dyno stock Banks 4.0L '05-04 Wrangler

140rwhp/179rwtq ?dyno '06 Wrangler 6 speed

140rwhp/183rwtq corrected*(156rwhp/202rwtq Dynojet) '00 TJ 31"

144rwhp/175rwtq ?dyno '97 ZJ 4.0

 

BOLT-ONS 4.0L-

133rwhp/165rwtq corrected*(149RWHP/183rwtq Dynojet) 2000, HAI, Catback, 0630

147rwhp/171rwtq corrected*(163rwhp/190rwtq Dynojet) K+N Factory, '97 XJ AW4 2WD 60k 2nd gear

148rwhp@4700/187rwtq@3100 Land+Sea Dyno, '01 WJ 4.0 106k, K+N FIPK, HF cat

150rwhp/174rwtq mustang dyno, '99 150k CAI, 62mmTB, cat back, ignition

153rwhp/180rwtq corrected*(170rwhp/200rwtq Dynojet) '88 XJ AX15 4WD Renix MegaSquirt3x 'mild' Comp cam

159rwhp/209rwtq corrected*(177rwhp/232rwtq Dynojet) '00 TJ 31" + 62TB, CAI, EDGE Trail Jammer module (+21hp/+30tq)

164rwhp/179rwtq corrected*(171rwhp/199rwtq Dynojet) K+N Factory, +FIPK (+7.9hp/+9.19tq)

 

SUPERCHARGED  TURBOCHARGED  STROKER  NITROUS-

141rwhp/184rwtq Mustang Dyno 4.6L Stroker log intake auto 37"MTR

156rwhp/266rwtq corrected*(173rwhp/295rwtq Dynojet) 4.7L Stroker '98 XJ 

176rwhp/226rwtq ?dyno Turbo 6psi '95 AW4 4wd FMU MSD BTM no intercooler 'CSaddict'

182rwhp/239rwtq corected*(202rwhp/265rwtq Dynojet) '95 Wrangler Turbo 6-7 psi 12:1FMU boostapump meth inj

185rwhp/241rwtq 4.6L Stroker  9.56:1  0.043"quench  stock head  +5-6*timing mod  63mmTB  24lb injectors  Hesco474/480 cam  ?dyno correction 204rwhp/265rwtq

190rwhp/263rwtq corrected*(211rwhp/292rwtq Dynojet) Boostwerks Turbo 6psi 4.2 MS 4.0head

191rwhp/265rwtq corrected*(212rwhp/295rwtq Dynojet) Boostworks Turbo 6psi 4.2L bored to 4.3L Megasquirt 99+intake

193rwhp/236rwtq ?dyno, 'Gradon's Stroker' from old post, 4.6L, 30cam, ported head

196rwhp/??rwtq  ?dyno, 4.6L, auto, Sprintex SC, ?boost, stock cam, stock head, AEM tune 

201rwhp/rw263tq ?dyno 240k 4.0 T3/T4 Turbo 6 psi tapering to 3-4 psi by redline(boost leak) 36 lbs injectors 99+ intake

202rwhp/258rwtq Dastek dyno, 'Cheromaniac's' '92 4.6L 'poor man's Stroker' '01 intake 65mmTB 9.25:1 ported head 5sp header

208rwhp/280rwtq Mustang dyno '01 TJ 5speed 5.0L Stroker 212/216 0.488"/0.498"cam stage II 505 head (supercharged below)

210rwhp/249rwtq ?dyno Banks 4.0L Turbo 6psi '05-06 Wrangler +66HP/+84TQ 35lb injectors, AutoMind tune, CAI

211rwhp/268rwtq DynoDynamics dyno '97 XJ M62 Supercharger Kit installed 6psi (crank 300HP/375TQ)

211rwhp/274rwtq mustang dyno '98 XJ auto 4WD160k Sprintex Supercharger 6 psi(crank 300HP/375TQ)

212rwhp/278rwtq ?dyno TurboJeeper '90 Renix 4.0 Auto 60-1 Turbo 1.15a/r 5psi 36lb-5.9L injectors FMU No Intercooler (stock 142rwhp/228rwtq)

220rwhp/260rwtq ?dyno, 'Mountaineer's' 4.0L Nitrous