here's my contribution to this section of the forum
been spending a bit of time tuning my R35 and its running super smooth now
i drove up to Willall Racing in SA and sat beside them as they tuned my GTR for 98 Ron and E85 (also installed my injectors, fuel pumps and turbo inlet pipes). Mod'ing this car is alot of fun, and the road trip and seeing the power climb on the dyno was an absolute blast for me
we made 388 awkw on 98 Ron and 422 awkw on E85 on a conservative tune, tappering boost towards redline to not put any unnecessary stress on the stock turbos
baseline for these cars stock on willall's dyno is around 290-300 awkw, and since every dyno reads differently, more important than outright numbers is the percentage gain of around 40% for some diy bolt ons
did a 10.7 on 21" street tyres before getting kicked off for not having a cage and harness. Hopefully ill be able to do a better run at a different venue with my 20" oem bridgestones as they are more a cut slick street tyre and should give me slightly more grip in 1st and 2nd
full list of mods as follows;
- Top Secret Intake 2.75"
- Top Secret Turbo Inlet Pipes 2.5"
- HKS SSQV 4 Bovs
- GZY Catless 3" Downpipes with Ceramic Coating by HPC
- Cobb Catted Midpipe 3"-3.5"
- GZY Titanium 3.5" Exhaust with Garage Active Ti 130mm tips
- Deatschwerks 950CC Injectors
- HKS Fuel Pumps
- Cobb Tuning
I have 1 map for 98 RON, 1 map for daily driven E85. Both are stored in my ecu and i switch bw them using my cruise control buttons and my boost gauge which shows which map im on. I dont need to have my Cobb Tuner plugged into the obd port. So all i do when switching fuels is get the level down to under 1/4 tank, fill up, switch the map over, and drive off. Very smooth system and with an increasing number of caltex stations stocking E85 (closest one is 3km round trip from my home) i find im using it more than 98 ron
here's how the map switching works for anyone interested http://www.youtube.com/watch?v=5xYnYM_JDJQ
not only is there a power difference with E85, which really is night and day in terms of midrange pull, but its also cleaner burning and slightly smoother running - so no black carbon build up. Trade off is increased mileage, around 30% im seeing, but then the fuel is cheaper at the bowser by about the same
i wasn't intending to go the E85 route, but Martin convinced me by saying the extra power would be addictive, and he was right
i've pretty much max'd out the safe levels of the stock turbos, so looks like i may be visiting Willall again in the new year for some turbos to chase a daily driven high 5s at the wheels