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Go Back   REVscene Automotive Forum > Technical Discussion > Advanced Forced Induction & N/A Engine Tuning

Advanced Forced Induction & N/A Engine Tuning This forum is brought to you by Racing Greed in Port Coquitlam.
Supercharger vs Turbocharger vs NA? Hondata vs Megasquirt? 94oct vs 87oct? Through technical discussion, let's find out what will the best option for you...

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Old 01-06-2010, 12:44 PM   #1
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2jzge vs 2jzgte

Wanted to share some information on turbo charged 2JZGE engine since there has been quite a bit of questions about 2JZGE with forced induction.

Start from dyno graph comparison between 2jzgte and 2jzge.

Stock Supra will do 190-200 hp at the wheel and best number we've ever seen on our dyno with stock turbo is 330rwhp (with FMIC, full exhasut, Boost controller, and AFC)

Run 1 (Solid line): IS300 automatic, w/ t67, meth, and E-manage Blue.
(stock Engine)
Run 2 (Dashed Line) : 95 Supra w/ stock turbo, full exhaust, FMIC,
and boost controller (stock ecu, no BCD)



When the IS300 came to the shop first time, it already had all the settup without meth, and had blown engine. All the set up seemed to be done right except the tuning parts.

With new engine and meth, the tune was very conservative (by choice of customer). The T67 is capable of a lot of power (approx 550rwhp on our dyno) and is better suited for a fully built engine.
So, both engines ended up making nearly identicle peak horsepower which is pretty impressive for 2jzge considering it's automatic and running that low boost on a big turbo, but supra's sequential system makes much more usable midrange torque and horse power.

Well, 2jzge with forced induction seems to work alright. in fact,I does work OK! if it set up right.

However, here's the problem.



It's dyno comparison between same turbo IS300 and supercharged IS300.

Run 1 (Solid line) : Turbo IS300 (same as above)
Run 2 (Dashed line) : Supercharged IS300 with aem EMS

With super charged IS300 (SC IS300), we couldn't get even close to the optimal timing because of detonation. Same with the turbocharged setup without meth.

SC IS300 was making more with higher ignition timing, but the high compression ratio made it hard to run a good timing map. You'll be limited by your fuel octane before reaching mean best timing.


Still, it's a great power gain over stock. (it'll do about 160hp at the wheel)
But, if you're serious about doing forced induction on 2JZGE, getting forged piston w/ lower comp ratio or meth or both will be better idea.

(Our mustang dyno reads about 25% off the crank hp, and reads 10 to 15% lower than dyno jet dynos, or any other dyno that runs a "correction factor" to match other dyno numbers.)
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Last edited by RacingGreed; 01-06-2010 at 02:23 PM.
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Old 01-12-2010, 04:02 PM   #2
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Thanks for posting, first of all!
What were the AFR's like? Do you think there might be room to run closer to MBT with a richer mixture and make good power still or is it on the rich side already?

Just goes to show how powerful programmable management really is. As you say, picking up around 100whp turboing the stock motor is a nice gain, but man there is so much more potential there.

Nice experiment and thanks for sharing.
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Old 01-21-2010, 03:40 PM   #3
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Quote:
Originally Posted by Captain Bondo View Post
Thanks for posting, first of all!
What were the AFR's like? Do you think there might be room to run closer to MBT with a richer mixture and make good power still or is it on the rich side already?

Just goes to show how powerful programmable management really is. As you say, picking up around 100whp turboing the stock motor is a nice gain, but man there is so much more potential there.

Nice experiment and thanks for sharing.
The turbo IS was running a safe 10.9 AFR with timing optimized. The downside of this car was that the turbo setup is for a fully built 2jz engine and not a stock NA 2jz, so we couldn't take advantage of the cars potential. The T67 turbo setup can make big power.
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Port Coquitlam, BC
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http://www.facebook.com/pages/Racing...40448429329074
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