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I did not know the TD05's were similar in power to the JWT 700 (I was thinking 530). It looks like I will have to do switchable maps from pump to e85. The ZL1 is our competition at 497 rwhp (see Hennessey website). Interesting to find Greg's turbo of choice!
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That post was the first GTX 2860 turbo set we ever installed on a 100% stock engine, those results were very good for stock heads and cams, we have set up and tuned many more since then with built engines.
This is a 25 year old car with a 3.0 liter V6 engine that has small head ports and small cams.
The 350Z (3.5 liter)and 370Z (3.7 liter) have MUCH larger head ports from the factory and large cams from the factory.
The ZL1 Chevy engine is 6.2 liters with HUGE head ports.
Think of the size head ports used in old 350 Chevy engines compared to today’s Chevy engines that make power.
You have to move air to make power, with turbos you can force the air through with pressure, but your limited by the octane of the fuel with how much power you can make before the pressure makes heat that causes detonation.
The 300zx stock head 300 engine HP that measured about 255 at the wheels on a chassis dyno, with breather mods, turbos, cams, and port work, we can double that power at the wheels on 91 octane gas that is worse than when the cars were new.
The stock heads and cams typically allow only 14 to 15 PSI boost on 91 octane fuel before the heat creates detonation going higher. The power you can make with stock heads and cams, with all other bolt on parts on 91 octane is around 450 at the tires with most of the larger turbos. The heads and cams provide another 50 at the tires (500ish), really good port work will net a little more.
The TD05-16G has similar compressor and turbine wheel sizes to the JWT Sport 700, but the TD05-16G has smaller housings that will cap the power a little more than the 700 turbos.
No matter what turbo you run, the octane is going to limit the safe power, you cannot get more air through the heads without more boost.
E85 fuel has crazy knock resistance and cooling effect, so making big power on E85 is much easier with a small engine.
The best turbo I have used on these engines requires better fuel than 91 octane to get the over the top results. My favorite turbo is the GTX2863, with head porting, cams, and E85 they make 800 HP at the tires, that is well over 900HP at the engine.
The EXP line we made used GT3071 and GT3076 turbos, these made awesome top end, but sacrificed some low end that the GTX2863 retains.
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