what about using hte JUN 2.2 or Cosworth 2.2 and getting the extra low end with the ability to still rev till 9k or AMS's new 2.3l stroker that can rev high. That gives you the best of both worlds but its very expensive.

 

I have a 2.4 4g64 with a gt3076r turbo. I know that turbo would be considered "small" in this thread, but I thought I'd put in my 2 cents for comparison. with the 3076 and 2.4, the spool rate feels identical to the spool rate of the stock 16g turbo on the 2.0. I havent even had the car professionally tuned yet, but it will hit 20+ psi at 3200 rpm and does NOT taper off at 7k like the stocker does. This setup will give a broad powerband from 3.2k to 8k. Good setup for autocross, road racing, and still decent at the drag strip.

JB

 

Not to go too far off topic here... but.... its not necessarily revs that a bigger turbo wants. More displacement I believe will shift the power curve down, and then I think the rod/stroke ratio as well plays a role here.

I posted a graph of a 700 hp GT35R car off an engine dyno, and most people concluded that the optimal place to shift was about 7800 rpm. This was on a 2.2 litre motor at 2.4 bar of boost.

 

i believe AMS has a 2.1 on thier drag car...i recall its like 2.5mm overbored and sleeved. Not the typical destroked 4g64 rounded up

 

once you get the tune im sure youre going to outrun your turbo and be shifting around stock to stay in power. its a great set-up for autocross and smaller curcuits.

i honestly wanted to do that or something similar, but i got an itch so i had to scratch it.

 

its all on where you want your power. if you want a car to spool a huge turbo on the street where you may or may not two-step a launch or youre just on the highway looking for power, get a stroker and have your displacement and your shorter rod ratio and spool the turbo earlier. like my buddi's subi...without giving out too many details he has a longer rod ratio and more displacement than i do...they are both "2.4l" but ill spool a turbo quicker and he'll hold it running for longer. so youre right...

 

I love this /\

 

2.3 for faster spool. power sooner
2.0 for slower spool, but longer rev, keep the power longer

 

after having the same turbo on a 2.0 and a 2.3, I don't think I would ever look back to a 2.0.

The 2.3 works much better in situations off boost to, you can actually pull off at low rpm w/out thinking your going to stall it as bad, lol. I can roll around town and accelerate effortlessly at about 3k rpm no problem.

Def do a 2.3 if you plan on street driving the car, unless you have only highways around..then its a diff story.

 

what are peoples opinions on the 2.1 and 2.2L engines they seem to give the best of both worlds.

 

i like this thread......

i was thinking of doing a Buschur 2.0L block, Buschur Race head, ported t-body and stock intake mani, with the HTA GT35R turbo if it ever gets released.

 

I've run 2 liters with turbos up to 35r, and 2.3s with turbos up to T67. The 2.3s spool the turbo much earlier, and flow about 15% more air mass at the same boost. While the strokers don't rev as high, they don't need to. They move more air at lower rpm. The problem is that higher rev limits allow you to take advantage of lower gearing for more of the track's length, and good ET to MPH ratio has a lot to do with gearing.

What it comes down to as always is the intended use of the car.

-A stroker will spool a big turbo on the street, and move more air at less boost, which is absolutely key for pump gas HP (airflow is power potential, boost is heat. And on pump gas, heat is knock, which means less timing, which means less HP), along with excellent intercooling.

-A 2 liter will spool big turbos real late, but make up for it with a higher redline. The higher RPM potential puts you in lower gears for more of the track, which helps ETs. The reduced airflow to boost pressure ratio is simply made up for with more boost, which on race gas carries a much lower knock penalty for obvious reasons.

 

a 2.4 or 2.4 with a full race twin scroll gt35r would be the perfect setup. lots of power with super quick spool

 

I guess I'm spoiled by my stock turbo which under most conditions hits full boost by 2800-3000 rpm. Even if it's a little off the 'big turbo' topic of this thread, I have wondered what a 2.3-2.4 liter with a 3076 or green turbo (upgrade but still fast spooling) would feel like. Would this be a way of getting near stock spool with more power potential?

 

a 2.4 and a medium to smaller a/r would provide a near stock spool if not better, provided it is a twin scroll.