4.9 stroker rwhp seems low.

Performance mods and Advanced Stroker discussion.
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Kingy146
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Joined: August 2nd, 2011, 5:17 am
Stroker Displacement: 300ci
Vehicle Year: 2000
Vehicle Make: Jeep
Vehicle Model: wrangler

4.9 stroker rwhp seems low.

Post by Kingy146 »

hi, i have a 2000 jeep wrangler with 4.9 stroker engine, 3'' intake , 3'' throttle body , extractors 3'' exhaust ,sct base tune running 33'' tyres and 4.88 diff gears only making 165rwhp doesnt seem rite. what could be wrong? an what rwhp should i be making.....
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Cheromaniac
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Re: 4.9 stroker rwhp seems low.

Post by Cheromaniac »

Big tires won't help the HP number but despite that it's still low. Can you post the dyno sheet?
1992 XJ 4.6 I6 - 5MT - Stroker build-up, Stroker "recipes" Sold
1995 Mustang GT - 4AT - Modded Sold
2006 Mustang GT - 5MT - Modded Midlife Crisis Car :mrgreen:
shawnxj
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Re: 4.9 stroker rwhp seems low.

Post by shawnxj »

4.88's are way too low for 33's but not sure that would show up on the dyno
Kingy146
Posts: 4
Joined: August 2nd, 2011, 5:17 am
Stroker Displacement: 300ci
Vehicle Year: 2000
Vehicle Make: Jeep
Vehicle Model: wrangler

Re: 4.9 stroker rwhp seems low.

Post by Kingy146 »

yea i have 35'' tyres on the way, also i will post the dyno print out as soon as the shop e mails it to me.
Kingy146
Posts: 4
Joined: August 2nd, 2011, 5:17 am
Stroker Displacement: 300ci
Vehicle Year: 2000
Vehicle Make: Jeep
Vehicle Model: wrangler

Re: 4.9 stroker rwhp seems low.

Post by Kingy146 »

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Cheromaniac
I live here
I live here
Posts: 3208
Joined: March 8th, 2008, 12:58 pm
Stroker Displacement: 4563cc
Vehicle Year: 1992
Vehicle Make: Jeep
Vehicle Model: Cherokee
Location: Cyprus
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Re: 4.9 stroker rwhp seems low.

Post by Cheromaniac »

There's no rpm scale and no torque scale either but I'm going to guess that the dyno run was done in 3rd gear and assume that the 147km/h end point was at the 5300rpm redline. That would mean that peak HP comes in at 4400rpm and your WOT AF ratio seems to be locked in at stoichiometric until 3000rpm.
What was peak torque and at what road speed (or rpm)?
Do you have a manual or auto tranny?

I know the Dyno Dynamics load dyno is popular in Australia and they use road speeds in km/h, so are you from Down Under by any chance?
1992 XJ 4.6 I6 - 5MT - Stroker build-up, Stroker "recipes" Sold
1995 Mustang GT - 4AT - Modded Sold
2006 Mustang GT - 5MT - Modded Midlife Crisis Car :mrgreen:
Kingy146
Posts: 4
Joined: August 2nd, 2011, 5:17 am
Stroker Displacement: 300ci
Vehicle Year: 2000
Vehicle Make: Jeep
Vehicle Model: wrangler

Re: 4.9 stroker rwhp seems low.

Post by Kingy146 »

ok yea i am in australia, and the run was done in 4th gear it has the std 5 speed manual. that is the only print out i have at this stage, my jeep is going in to be tuned in 3 days time. i will post all dyno figures once it is tuned.
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