06-12-2008, 01:00 AM
|
 |
Junior Member
|
|
Real Name: Angie
Join Date: May 2008
Posts: 16
|
|
|
need for speed
I'm looking to squeeze a bit more speed off the line from my 4.0L YJ automatic. It runs great, it just doesn't have quite the get up and go that I'd like. I was thinking a set of headers or maybe new exhaust, any suggestions?  |
|
|
|
Sponsored Links - Removed for registered members
|
|
|
06-12-2008, 06:08 AM
|
 |
Administrator
|
|
Real Name: Terry Mason
Join Date: Dec 1999
Location: Virginia Beach VA
Posts: 2,425
|
|
|
Re: need for speed
What year YJ? Does it have a carb?
|
|
|
06-12-2008, 10:06 AM
|
 |
Member
|
|
Real Name: jeepster357
Join Date: May 2008
Location: Lakewood, Co.
Posts: 75
|
|
|
Re: need for speed
Not sure what your fuel supply set up is but I sure preach the gospel of after market cold air intakes and throttle body spacers. Its not gonna win you a drag race but on my manual trans it has reduced the amount of downshifting on steep grades and given me a little more zip while passing on the highway. |
|
|
06-12-2008, 10:51 AM
|
 |
Moderator
|
|
Join Date: Nov 2002
Location: Southern Illinois
Posts: 8,521
|
|
|
Re: need for speed
Do you have stock size tires? If larger than stock, regearing the axles to lower gears will be the number one improvement to off-line driveability.
If you're YJ is a '91+, I'd recommend a 62mm throttle body (like the ones I sell). They greatly increase airflow to the engine and it removes the taper beneath the throttle plate that restricts airflow for the first 1/4" of throttle movement. Throttle response is increased dramatically.
__________________
|
|
|
06-12-2008, 03:34 PM
|
|
Member
|
|
Join Date: Aug 2007
Location: miami
Posts: 96
|
|
|
Re: need for speed
I agree with bounty hunter. gears best bang for the buck
__________________
Make mine an old CJ with a V8 and no top!
|
|
|
06-12-2008, 11:12 PM
|
|
Junior Member
|
|
Real Name: Angie
Join Date: May 2008
Posts: 16
|
|
|
Re: need for speed
It's a 93, fuel injected, w/31 inch mudders. I hadn't thought of the TBS, I'll go that route first. Thanks
|
|
|
06-13-2008, 12:49 AM
|
|
Moderator
|
|
Join Date: Nov 2002
Location: Southern Illinois
Posts: 8,521
|
|
|
Re: need for speed
The 62mm TB will do more for you than a spacer, but the 62mm TB and a 62mm spacer would be even better. I know somebody that sells both, pretty cheap 
Also consider injectors from a mid '90s Ford v8, either Mustang or Crown Vic.
Then there's the Livewire kit from Performance Distributors for a hotter ignition system, plugs gapped at .065".
__________________
|
|
|
06-14-2008, 12:53 PM
|
 |
Junior Member
|
|
Real Name: Paul
Join Date: May 2008
Location: Sammamish, WA
Posts: 29
|
|
|
Re: need for speed
bounty hunter
Does a 97 4.0 have a 62mm throttle body? Just curious if i could beneifit from that.
thanks
|
|
|
06-15-2008, 11:49 PM
|
|
Moderator
|
|
Join Date: Nov 2002
Location: Southern Illinois
Posts: 8,521
|
|
|
Re: need for speed
I believe the stock 4.0L TB is only 55mm, with a restrictive taper beneath the throttle plate.
Here's a pic comparing my 62mm TB to a stock 55mm TB.
__________________
|
|
|
06-16-2008, 12:55 PM
|
|
Junior Member
|
|
Real Name: Angie
Join Date: May 2008
Posts: 16
|
|
|
Re: need for speed
Bounty__Hunter
Do you have a website I can peruse where you sell this stuff?
|
|
|
06-16-2008, 08:53 PM
|
|
Moderator
|
|
Join Date: Nov 2002
Location: Southern Illinois
Posts: 8,521
|
|
|
Re: need for speed
No website, just me, either sites like this one or on Ebay.
Nothin really to peruse but 62mm TB's and the occasional 62mm spacer.
__________________
|
|
|
06-17-2008, 01:55 AM
|
 |
Member
|
|
Join Date: Nov 2007
Location: Massachusetts
Posts: 30
|
|
|
Re: need for speed
A turbo can fix anything  |
|
|
06-21-2008, 08:43 AM
|
 |
Junior Member
|
|
Real Name: Jay z Jeep Junkie
Join Date: Jun 2008
Location: Michigan
Posts: 4
|
|
|
Re: need for speed
Bounty Hunter,
what would be your suggestion for the 4 banger.. I have 92,wrangler fuel injected
besides dropping in a v8 !!!
|
|
|
06-22-2008, 07:07 AM
|
|
Moderator
|
|
Join Date: Nov 2002
Location: Southern Illinois
Posts: 8,521
|
|
|
Re: need for speed
My suggestion would be to regear the axles to match any increase in tire height, and add performance mods as your budget allows. My 2.5L is fun to drive, very responsive and holds its own.
__________________
|
|
|
08-14-2008, 04:47 PM
|
|
Official Vendor
|
|
Real Name: tom
Join Date: Aug 2008
Posts: 25
|
|
|
Re: need for speed
i can sell you a 68mm throttle body. i am a distributor for one of my sponsors. F&B Throttle Bodies
|
|
|
08-14-2008, 04:52 PM
|
|
Official Vendor
|
|
Real Name: tom
Join Date: Aug 2008
Posts: 25
|
|
|
Re: need for speed
cheaper than buying direct |
|
|
08-14-2008, 08:26 PM
|
|
Junior Member
|
|
Real Name: Angie
Join Date: May 2008
Posts: 16
|
|
|
Re: need for speed
I had to do an unexpected rebuild on the motor about a month ago and went ahead while I had the whole thing pulled out and put on a set of banks headers and the 62mm TB and spacer and I got exactly what I was looking for. Throttle response improved dramatically with that combo, I couldn't be happier. Now if I could just afford the cool air intake and exhaust...might have to shoot off a letter to Santa.
|
|
|
|
Sponsored Links - Removed for registered members
|
|
|
| Thread Tools |
|
|
| Display Modes |
 Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
Similar Threads
|
| Thread |
Thread Starter |
Forum |
Replies |
Last Post |
|
Vibes at speed
|
jay79cj7 |
Cherokee, Commander, Wagoneer and Liberty |
2 |
06-30-2005 11:41 PM |
|
Cj5 Speed
|
jeeprostyle |
CJ YJ TJ and JK |
18 |
07-15-2004 12:45 PM |
|
Speed-o-meter
|
Natty |
CJ YJ TJ and JK |
7 |
07-20-2003 07:00 PM |
|
97 tj with a shot 5 speed
|
rockwrangler |
CJ YJ TJ and JK |
4 |
07-20-2003 07:00 PM |
|
top speed?
|
LGR |
General Chat |
22 |
07-20-2003 07:00 PM |
All times are GMT -5. The time now is 09:13 PM.
|
