I'm not a dissatisfied customer. I have had very good support from diablo initially setting up my tune and from the seat of the pants gauge my truck hauls now. I just wanted the opinions of members here as to the claims that the diablo and handheld programmers in general don't produce as much gains ...

It is the opinion of many on other gm truck forums that tunes such as nelson give better results of performance than the diablo. I am pleased with the increased performance but would always want more. Is nelson or other independent tuners that much better? If so can the diablo match them with the ...

The ltfts were rock solid. For the first 20 minutes the readings were .78, after 30 or so 1.56 as long as i was on a slight incline or flat section. During declines around 4.00.
Thanks

2000 silverado 5.3 std cab swb
gibson headers & catback, cats removed, 87 tune, tb spacer, cold ram air
I just ran 50 miles with my diablo connected to monitor ltft. I set cruise on 70 mph @ 1900 rpm. LTFTs were +1.56 on both banks on a steady cruise after 30 mins. STLTs bounced from -.78 to 5.00 ...

I've had it at least a year, I will check the revision. Can it be upgraded to log? I bought it with the serial cable. Can this and a laptop enable me to log?

I have a U7198 for my 2000 silverado and want to data log. Does my handheld have this capability? Can I use a laptop and the handheld and data log?

2000 silverado 5.3 auto, elec fans, gibson shorties and cat back, cats removed, tb spacer, cold air, tb bypass. I have the U7198 programmer and currently running the 87 tune. I have been researching hydrogen boosters. Does the Diablo have enough adjustability to lean the mixture to compensate for ...

I installed electric fans on my truck and currently have them controlled by a standalone adjustable thermostat. I want to trigger the fans when the A/C is turned on. Does anyone know the easiest way to do this, tap into the A/C curcuit.
I used fans from a 2004-8 Nissan Quest mini-van. It is a dual ...

Got the e-mail and loaded the new tune and the shifts are correct now. Thanks for the help.

Mods:
5.3L
auto
gibson headers
cats removed
gibson single 3" exhaust
electric fans
TB spacer
open air cleaner
I have run both the 87 octane and 93 tune. The truck responded very well to both tunes. I have not seen any increase in mileage with either tune although it hasn't gotten worse.
My ...

Mods:
gibson headers
cats removed
gibson single 3" exhaust
electric fans
TB spacer
open air cleaner
I have run both the 87 octane and 93 tune. The truck responded very well to both tunes. I have not seen any increase in mileage with either tune although it hasn't gotten worse.
My problem is that ...

2000 silverado, air intake, tb spacer, gibson shorty headers and cat back, cats removed, electric fans.
This programmer really woke my truck up. I'm using the 87 octane program now. I want to see if I get any mpg improvement and then I will try the 93 program.
Mike,
I posted earlier and you ...

At COT there are 2 selections:
1. COT enable temp...I set it to 1200c
2. P-0420 & 430...did nothing here

At OBDII O2 sensor there are many codes to turn off
which do I select or turn all off?
I did not see a specific code when looked at the trouble codes
but the CEL light went off after reseting

I ...

I have a 2000 silverado. Modifications include gibson short headers, gibson cat back single exhaust, throttle body spacer, cats removed, k&n filter (I used an open air element from a 1999 tahoe). I removed the screen on the MAF but I have read that may have been a mistake. Immediately after I ...