Dyno Results, 4.6 Super-Stroker
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Joined: Jun 2012
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Model: Cherokee
Member
Joined: Jun 2012
Posts: 179
Likes: 0
Model: Cherokee
Unfortunately today with OBD/emission/smog checks and inspections cat converters, etc, on a DD which is legal, you are pretty stuck with the stock ECU.
Only a few aftermarket/standalone ECUs even support OBD2. And there are currently no aftermarket/standalone ECUs that are plug and play, already programmed, OBD2, direct replacement for the Jeep 4.0. Offroad racers and JeepSpeed types have all the options available.
Only a few aftermarket/standalone ECUs even support OBD2. And there are currently no aftermarket/standalone ECUs that are plug and play, already programmed, OBD2, direct replacement for the Jeep 4.0. Offroad racers and JeepSpeed types have all the options available.
And our Jeeps are from the 80s and 90s and require 80s and 90s thinking/technology to get them to work.
Unfortunately we can't use today's tuning strategies on them. Sure it would be nice if EFIlive, etc supported the Jeeps. Everything is a compromise. The Jeep ECU can be tuned using SCT products but so far only one guy does it by mail and $$. And you have a very small resolution window to spread now over the boost area. Resolution example like every 1000 rpm and not 100 rpm.
Unfortunately we can't use today's tuning strategies on them. Sure it would be nice if EFIlive, etc supported the Jeeps. Everything is a compromise. The Jeep ECU can be tuned using SCT products but so far only one guy does it by mail and $$. And you have a very small resolution window to spread now over the boost area. Resolution example like every 1000 rpm and not 100 rpm.
I don't have any stake in Split Second. He was the only one willing to try something different. I looked at the AEM FIC and have 2 units sitting on the shelf. I didn't like how they only modify an ecu generated injector pulse width either + or - and don't actually program the pulse width you really want.
Yep the Jeeps aren't the fastest, run hot, last 200k+ miles, need low rpm grunt and will never win a HP or efficiency/mpg war. They are what they are. Some just like to make them a bit better at what they are.
Yep the Jeeps aren't the fastest, run hot, last 200k+ miles, need low rpm grunt and will never win a HP or efficiency/mpg war. They are what they are. Some just like to make them a bit better at what they are.
Thread Starter
CF Veteran
Joined: Apr 2010
Posts: 1,575
Likes: 4
From: Florida
Year: 2000
Model: Cherokee(XJ)
Engine: 4.6 Re-Built Golen, 68-200-4 Comp Cam
CF Veteran
Joined: Dec 2011
Posts: 1,777
Likes: 22
From: PA KOTUFU!
Year: 1998
Engine: 4.0L 162,000
Do you have the 7th injector 'T' fuel line?
The 7th injector supplied by Sprintex is a 50 lb/hr short guy off a LS1 application.
It is like this one but 50 lb/hr and not 80 lb/hr like we use with 10 pounds of boost. It will probably need different/bigger O rings to fit and not leak IIRC.
http://www.ebay.com/itm/321224637534?ssPageName=STRK:MESINDXX:IT&_trksid=p 3984.m1436.l2649
I probably have my old one, 50 lb/hr, at home sitting on the shelf. I am out of town working and won't be home until late Tuesday.
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Joined: Dec 2011
Posts: 1,777
Likes: 22
From: PA KOTUFU!
Year: 1998
Engine: 4.0L 162,000
Internet sucks, if we were all local, beers on me.
Can you run the engine and drive it and be careful and keep it out of boost?
Make sure everything is working and breaking it in.
We drove our's like that for a few week to shake it down, checking for any leaks or issues while the SS box was being made.
Thread Starter
CF Veteran
Joined: Apr 2010
Posts: 1,575
Likes: 4
From: Florida
Year: 2000
Model: Cherokee(XJ)
Engine: 4.6 Re-Built Golen, 68-200-4 Comp Cam
I thought you were running a 7th injector trying to control it with the AEM FIC. Do you have the 7th injector? mounting hardware?
Do you have the 7th injector 'T' fuel line?
The 7th injector supplied by Sprintex is a 50 lb/hr short guy off a LS1 application.
It is like this one but 50 lb/hr and not 80 lb/hr like we use with 10 pounds of boost. It will probably need different/bigger O rings to fit and not leak IIRC.
http://www.ebay.com/itm/321224637534?ssPageName=STRK:MESINDXX:IT&_trksid=p 3984.m1436.l2649
I probably have my old one, 50 lb/hr, at home sitting on the shelf. I am out of town working and won't be home until late Tuesday.
Do you have the 7th injector 'T' fuel line?
The 7th injector supplied by Sprintex is a 50 lb/hr short guy off a LS1 application.
It is like this one but 50 lb/hr and not 80 lb/hr like we use with 10 pounds of boost. It will probably need different/bigger O rings to fit and not leak IIRC.
http://www.ebay.com/itm/321224637534?ssPageName=STRK:MESINDXX:IT&_trksid=p 3984.m1436.l2649
I probably have my old one, 50 lb/hr, at home sitting on the shelf. I am out of town working and won't be home until late Tuesday.
Thread Starter
CF Veteran
Joined: Apr 2010
Posts: 1,575
Likes: 4
From: Florida
Year: 2000
Model: Cherokee(XJ)
Engine: 4.6 Re-Built Golen, 68-200-4 Comp Cam
That's funny. Just what I thought.
Internet sucks, if we were all local, beers on me.
Can you run the engine and drive it and be careful and keep it out of boost?
Make sure everything is working and breaking it in.
We drove our's like that for a few week to shake it down, checking for any leaks or issues while the SS box was being made.
Internet sucks, if we were all local, beers on me.
Can you run the engine and drive it and be careful and keep it out of boost?
Make sure everything is working and breaking it in.
We drove our's like that for a few week to shake it down, checking for any leaks or issues while the SS box was being made.
The cam was already broke in.
Thread Starter
CF Veteran
Joined: Apr 2010
Posts: 1,575
Likes: 4
From: Florida
Year: 2000
Model: Cherokee(XJ)
Engine: 4.6 Re-Built Golen, 68-200-4 Comp Cam
You seem to have a lot of spare stroker/supercharger parts laying around. What else you got back there? Seems like every time I have a problem you have just what I need, but I only find out after I've ordered the new part.
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Joined: Dec 2011
Posts: 1,777
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From: PA KOTUFU!
Year: 1998
Engine: 4.0L 162,000
Always upgrading. Don't ask about steering parts.
The local JY is really cheap and we go and canibalize most everything off '98+ models usually for a great price. It's hard to just leaving it alone plus we have 4 XJs at present and switch and swap and repair them all.
The local JY is really cheap and we go and canibalize most everything off '98+ models usually for a great price. It's hard to just leaving it alone plus we have 4 XJs at present and switch and swap and repair them all.
Thread Starter
CF Veteran
Joined: Apr 2010
Posts: 1,575
Likes: 4
From: Florida
Year: 2000
Model: Cherokee(XJ)
Engine: 4.6 Re-Built Golen, 68-200-4 Comp Cam
Always upgrading. Don't ask about steering parts.
The local JY is really cheap and we go and canibalize most everything off '98+ models usually for a great price. It's hard to just leaving it alone plus we have 4 XJs at present and switch and swap and repair them all.
The local JY is really cheap and we go and canibalize most everything off '98+ models usually for a great price. It's hard to just leaving it alone plus we have 4 XJs at present and switch and swap and repair them all.
Thread Starter
CF Veteran
Joined: Apr 2010
Posts: 1,575
Likes: 4
From: Florida
Year: 2000
Model: Cherokee(XJ)
Engine: 4.6 Re-Built Golen, 68-200-4 Comp Cam
It'll be there tomorrow: http://www.fuelairspark.com/fas/1-ls...-injectorhtml/
The FTC is supposed to ship today and arrive tomorrow as well. We'll see just how plug and play these two are.
The FTC is supposed to ship today and arrive tomorrow as well. We'll see just how plug and play these two are.
CF Veteran
Joined: Dec 2011
Posts: 1,777
Likes: 22
From: PA KOTUFU!
Year: 1998
Engine: 4.0L 162,000
That injector is a EV6 connector and IIRC the SS box uses EV1 connector. You might need an adapter.
And they are 50lb/hr at 58psi not 43.5 or 49psi. It will flow much less at lower psi.
The injector that I showed you from ebay is rated at 43.5psi and will actually flow more at 49psi.
And they are 50lb/hr at 58psi not 43.5 or 49psi. It will flow much less at lower psi.
The injector that I showed you from ebay is rated at 43.5psi and will actually flow more at 49psi.
Last edited by CobraMarty; Nov 10, 2014 at 01:54 PM.
Thread Starter
CF Veteran
Joined: Apr 2010
Posts: 1,575
Likes: 4
From: Florida
Year: 2000
Model: Cherokee(XJ)
Engine: 4.6 Re-Built Golen, 68-200-4 Comp Cam
That injector is a EV6 connector and IIRC the SS box uses EV1 connector. You might need an adapter.
And they are 50lb/hr at 58psi not 43.5 or 49psi. It will flow much less at lower psi.
The injector that I showed you from ebay is rated at 43.5psi and will actually flow more at 49psi.
And they are 50lb/hr at 58psi not 43.5 or 49psi. It will flow much less at lower psi.
The injector that I showed you from ebay is rated at 43.5psi and will actually flow more at 49psi.
I got an adapter on Summit. Thanks for the heads up. I wasn't aware of the differences in the connectors. !
CF Veteran
Joined: Dec 2011
Posts: 1,777
Likes: 22
From: PA KOTUFU!
Year: 1998
Engine: 4.0L 162,000
Injector flow differs by the square root of the pressure ratios.
Square root of new/old pressure times inj rate at old pressure,
square root of 49/58 times 50 = new inj flow at new pressure.
Getting close!!
Square root of new/old pressure times inj rate at old pressure,
square root of 49/58 times 50 = new inj flow at new pressure.
Getting close!!
Thread Starter
CF Veteran
Joined: Apr 2010
Posts: 1,575
Likes: 4
From: Florida
Year: 2000
Model: Cherokee(XJ)
Engine: 4.6 Re-Built Golen, 68-200-4 Comp Cam