ECU remap comparison
- Thread starter Rfurzer
- Start date
Another option is a company called SpeedTuning USA in Spencerville, MD who chips Land Rover V8 ECU's ... http://www.speedtuningusa.com/
This is the email response they sent me back in May:
From: "SpeedTuning USA" <info@speedtuningusa.com>
Date: May 22, 2019 at 15:09:12 GMT+1
To: "'JUKE179r'"
Subject: RE: ECU power chip
Reply-To: <info@speedtuningusa.com>
Hello Mike,
Yes we can do your Land Rover Discovery 4.0 V8 01. Process would be to send
in your ECU and we normally turn it around the same day. We have different
stages we could do, do you mind giving us a call and we give you all the
options and answer all your questions over the phone? I would suggest a St2
since it is a NA tuning application, price $375, you could get up to plus
15-20HP depending of your supporting mods.
Best regards,
Oliver
SpeedTuningR USA
Performance Tuning for Diesel and Gas Engines
2203 Spencerville Road
Spencerville, MD 20868
(301) 421-9464
www.SpeedTuningUSA.com
info@SpeedTuningUSA.com
This is the email response they sent me back in May:
From: "SpeedTuning USA" <info@speedtuningusa.com>
Date: May 22, 2019 at 15:09:12 GMT+1
To: "'JUKE179r'"
Subject: RE: ECU power chip
Reply-To: <info@speedtuningusa.com>
Hello Mike,
Yes we can do your Land Rover Discovery 4.0 V8 01. Process would be to send
in your ECU and we normally turn it around the same day. We have different
stages we could do, do you mind giving us a call and we give you all the
options and answer all your questions over the phone? I would suggest a St2
since it is a NA tuning application, price $375, you could get up to plus
15-20HP depending of your supporting mods.
Best regards,
Oliver
SpeedTuningR USA
Performance Tuning for Diesel and Gas Engines
2203 Spencerville Road
Spencerville, MD 20868
(301) 421-9464
www.SpeedTuningUSA.com
info@SpeedTuningUSA.com
It is probably more worth it if you have a heavily modified motor. I'm not sure about GEMs but I think with 14cux it switches to open loop during wide open throttle. You could potentially have a lean condition (and lack of power) if you don't have a chip since it wouldn't be looking at the o2 sensors and running a tune based on the stock engine.
That brings up a memory of an old heated conversation related to chipping a 14CUX or GEMS motor.
My personal issue at the time was - how can one promise increase in power AND in fuel economy at the same time?
I could definitely appreciate the answer, even if I cannot verify if it is true: Land Rover's approach to requirement to be able to run 85-87-octane gas in the U.S., along with inability to reliably detect detonation in GEMS engines, was to run the engines slightly rich most of the time. So, if one decided to never run anything but 91-93-octane gas, one could in theory use a leaner fuel map and advance the ignition a little. Advancing the ignition would bring some increase in power, and leaner fuel map would offer some economy.
The indirect confirmation to this explanation is in better gas mileage of vehicles with the similar powertrains (3.5-4.5L v6/v8, 4-speed auto with lockup TC) and of the similar weight.
Another indirect confirmation is in my recent Baja trip which included running a full tank of 85-octane gas in the Classic. I could not tell if there was any loss in power - and I remember clearly feeling the difference in an old 240 and newer XC70 Volvos.
My personal issue at the time was - how can one promise increase in power AND in fuel economy at the same time?
I could definitely appreciate the answer, even if I cannot verify if it is true: Land Rover's approach to requirement to be able to run 85-87-octane gas in the U.S., along with inability to reliably detect detonation in GEMS engines, was to run the engines slightly rich most of the time. So, if one decided to never run anything but 91-93-octane gas, one could in theory use a leaner fuel map and advance the ignition a little. Advancing the ignition would bring some increase in power, and leaner fuel map would offer some economy.
The indirect confirmation to this explanation is in better gas mileage of vehicles with the similar powertrains (3.5-4.5L v6/v8, 4-speed auto with lockup TC) and of the similar weight.
Another indirect confirmation is in my recent Baja trip which included running a full tank of 85-octane gas in the Classic. I could not tell if there was any loss in power - and I remember clearly feeling the difference in an old 240 and newer XC70 Volvos.
Ouch.
Guess I won't bother then
1.4:1 high range LT230 is a lot cheaper than a supercharger.
Ouch.
Guess I won't bother then
1.4:1 high range LT230 is a lot cheaper than a supercharger.
TBH, the compression in my engine is too high. When I rebuilt it (spun a bearing) I reused the aftermarket pistons which had cutouts for the valves in them. I did a compression test a couple years ago and had over 230 psi on each cylinder. I'm pretty confident it won't pass smog in Ca as it is. I'm thinking about doing another rebuild on it to put it more how a stock 4.6 should be.
If your fuel system can take some ethanol I'd try adding it before the smog check. Maybe add a couple of gallons of E85 (sold increasingly in SoCal) to ~5 gal of premium.