Quote:
Originally Posted by TurboTravis
Guys, my friend has an Evo 8. It has intercooler hardpipes, downpipe, exhaust, air intake and a boost controller. He has a set of 264 cams on the shelf. What is the next thing that he can do to the car? How fast can these cars go on the stock turbo?
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Troy already gave a great answer, so I'm going to expound on that. Here is the list he gave:
- Walbro 255 Fuel Pump- Do this first as a nice fuel safety item
- Is he custom tuned? - Most important mod of all here. He needs to be sure that he's custom tuned with a pro Evo tuner using EcuFlash (free flashing software for the Evo)
- upgraded front mount intercooler - Not as necessary at first, but becomes very valuable in high temps, sustained racing, and/or when running big boost a lot (with proper fuel)
- ported/coated exhaust manifold - Easy, cheap mod and better than buying a tubular manifold (cheaper, stronger, more powerful) when still on the stock turbo
- ported/coated exhaust housing (turbo)
- ported intake manifold - usually a later mod after all other mods are done on the stock turbo
- Ported 65MM Throttlebody - usually a later mod after all other mods are done on the stock turbo
- stainless steel o2 housing - one of the best bang-for-buck mods as it is very cheap and makes great power for the price
- Evo 9 turbo swap - great mod if you want to get the most possible out of the stock turbo. The Evo IXs came with the same turbo (16G6) but with improvements that allow it to make a good bit more power than both the 03-04 and 05 VIII turbos. I gained ~25whp with a direct swap and no tuning or boost changes, and it cost me $450 shipped
- Test Pipe - you listed downpipe and "exhaust" but that typically means the downpipe and cat-back. Be sure he has a cat replacement (test pipe) to make the most power with best spool/response
- Cams - 264s are the mildest unless they are Jun, but get those in anyway, because they are one of the best mods for the Evo
- BOV - Upgrade the stock plastic one with an Evo IX aluminum BOV, JDM MR BOV, or Forge RS BOV
- Wastegate Actuator - Stronger WGA for either the VIII or IX
To get the most out of a stock turbo, you have to run big boost on a race fuel equivalent:
- Race gas (leaded or unleaded from 100 to 120oct)
- Possibly need slightly larger injectors than stock (i.e. 650cc) - E-85 (best bang-for-the-buck mod ever on the Evo, imo)
- Need much bigger injectors (880-1000cc), but it's worth it! - Alky/meth injection
- No injectors needed, but need a failsafe and have to refuel alky/meth separately
As for what the stock turbo is capable of, look here:
Top 15 Fastest/Quickest – Stock Turbo Evo’s for 2008 - evolutionm.net
As you can see, even though myself (11.51) and Tobz (my tuner - 11.99)) are both in the 11s and doing quite well, we are relative chumps when compared to the rest of the country. Only one of those cars is using nitrous, and just a few are very lightweight. A few have stock cams and are running that fast, including Fathouse who just moved from 11.68 to 11.508 (barely ahead of me). The main difference for us is that those guys are at sea level, and we are at extreme altitude. I lost about half a second when I moved here, so if you take off 4-5 tenths from my 11.51, you can see I'd be right in the thick of things nationally. My car is normal weight at 3275-3300 with me in it. The top car on that list is supposedly around 2600lbs but several others are normal weight like me.
get em in there!
