It's been a while since I first Gteched my 1.6TD! Here's the original dyno of the bone stock 1.6TD (factory rated 69HP) from mid April of this year:
Stock 1.6TDIf you are unfamiliar with Gtech you can learn more about it at
http://www.gtechpro.com. Gtech HP and TQ values are normally lower than values from a common vehicle dynamometer because the car experiences aerodynamic resistance and other resistances when it is actually moving on the road (with GTech in operation), unlike on a stationary dyno.
For reference, a stock MK3 VR6 that is factory rated at 172HP and usually reads 155 wheel HP on a dyno, averaged
132 net HP according to my Gtech.
My MK3 1997 Golf used to have a 1.8L 8v gasoline engine that's factory rated at 90HP. Its power/tq is shown in black. The red line is my current 1.6TD in the same car
with the LDA device (boost pin) inactive. I was just curious to see how the 1.6TD's powerband compares without the LDA. Both 3rd gear pulls, with the exact same transmission.
1.8L 8v gas vs. 1.6TD in same chassisFor some reason my old 1.8L 8v felt a bit underpowered. My friend's identical MK3 Golf CL 1.8L 8v feels a bit stronger and reported approximately 71HP on my Gtech. Anyway, the 1.6TD feels very nice for daily driving without the LDA - excellent "off boost" or eco-diesel style performance. More enjoyable than the 1.8L.
Driving with the LDA functional is a whole different story though
Here's a 1990 MK2 Jetta 2.0L 16v (factory rated 134hp) with a Neuspeed 91 octane chip and 2 1/2" crush bend exhaust. I think the shakiness is caused by his extremely stiff suspension, but all of his Gtech runs were very consistent:
MK2 2.0L 16v gasHis 16v feels very strong and I was rather surprised at his 96 net HP result, but his vehicle weight was correct (weighed at a truck scale) and results were still consistent.
It was pouring rain non-stop in the last week so I had traction difficulties during high RPM while Gteching my 1.6TD recently, but here's the result anyway. The LDA is connected. It's compared against the same 2.0L 16v (green).
2.0L 16v vs. 1.6TDAt 4,000 RPM in 3rd gear the wheels just let go. The redline is 6,500 but since the wheelspin occured I had to let off. When the road condition gets better I'll do a complete run.
I could not find the VR6 GTech plots but a friend is coming over here in 2 to 3 weeks from Vancouver island with his MK3 VR6 so we'll take more GTech plots in his car and compare it against my 1.6TD.
The air/water intercooler is still not functional (although EGTs were still within safe limits) and there was zero smoke during the acceleration. I can't even get it to smoke much above 1,800 RPM - it's seriously underfueled. Mayday Giles; this pump isn't providing enough fuel!!
The current turbo is a GT20 that spools quicker than a stock 1.6 turbo, thanks to the overall fueling and airflow improvement since the 1.6 engine rebuild. There's much more potential to come with intercooling, extra fueling, a better turbo, etc.
The car really moves.. the low RPM torque is plentiful for daily driving and I seem to be benefiting well from the 1.6's rev capability; the power really picks up as the RPM climbs!
*edit: I combined the existing 1.6TD plots for a nice comparison. The power differences are pleasant
:
Stock 1.6TD (black) vs. Current 1.6TD (red)