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No power gained from 4.7L srtoke

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Basselalawar
Posts: 1
Joined: June 18th, 2019, 6:28 am
Stroker Displacement: 4.7L
Vehicle Year: 1998
Vehicle Make: Jeep
Vehicle Model: XJ

No power gained from 4.7L srtoke

Post by Basselalawar » June 18th, 2019, 6:50 am

Hello,
I have a 4.7L 1998
the engine is healthy with no issues, I have hesco throttle body, Gibson headers, 4 hole injector upgrade. the current piston compression ratio is 10:1. I have small gains compared to 4.0L and the engine cant rev to the rev limiter. Didnt do any tune or cps mods.
help is really appreciated

Sean295
Posts: 8
Joined: March 6th, 2019, 5:03 pm
Vehicle Year: 1997
Vehicle Make: Jeep
Vehicle Model: TJ

Re: No power gained from 4.7L srtoke

Post by Sean295 » June 18th, 2019, 7:06 pm

I assume you have a after market cam..if so you will mos likely need to index the distributor.

Was it running fine to start with and something happened or is it a new build?

Try a compression test...make sure your building pressure....make sure your getting plenty of fuel by checking the fuel pressure...those fuel pumps are not the greatest....spark is the next thing...

papaof2
Posts: 1
Joined: June 5th, 2015, 8:43 pm
Vehicle Year: 1999
Vehicle Make: Jeep
Vehicle Model: TJ
Location: Central Calif.

Re: No power gained from 4.7L srtoke

Post by papaof2 » June 18th, 2019, 7:11 pm

A tune from frptuning.com / Flyin' Ryan Performance will make all the difference.

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SkylinesSuck
Donator
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Posts: 490
Joined: February 14th, 2009, 11:11 pm
Stroker Displacement: 4.6L
Vehicle Year: 1998
Vehicle Make: Jeep
Vehicle Model: Wrangler
Location: Northern VA

Re: No power gained from 4.7L srtoke

Post by SkylinesSuck » June 20th, 2019, 12:16 pm

Not if it's not running right first. Ryan won't want to touch it if it isn't. You should see a very noticeable increase in power across the board even with no tune. Do you have a wideband O2 sensor to tell you what your fueling is like? What injectors are you running?

astjp2
I think I'll order a "tab"
I think I'll order a "tab"
Posts: 45
Joined: September 11th, 2008, 8:50 am
Stroker Displacement: 4.7
Vehicle Year: 1994
Vehicle Make: Jeep
Vehicle Model: Wrangler

Re: No power gained from 4.7L srtoke

Post by astjp2 » July 6th, 2019, 4:58 pm

Is the catalytic converter clogged? My stroker runs like a scalded dog...

tablerockfshr
Posts: 1
Joined: August 4th, 2019, 8:57 am
Stroker Displacement: 4.6
Vehicle Year: 1999
Vehicle Make: xj
Vehicle Model: sport

Re: No power gained from 4.7L srtoke

Post by tablerockfshr » August 4th, 2019, 9:05 am

I had the same thing till I upgraded the fuel pump on a 99 xj with 24lb injectors ...just my situation,,

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Cheromaniac
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Posts: 2739
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: No power gained from 4.7L srtoke

Post by Cheromaniac » August 6th, 2019, 1:53 am

If the old fuel pump is weak, a new stock replacement would do fine. Rated at 90lph (24gph), that's enough to fuel a 300hp N/A engine.
1992 XJ 4.6 Stroker - 5MT - Sold :cry: Stroker build-up, Stroker "recipes"
2006 Mustang GT - 5MT - Midlife crisis car :D with Mods

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