constant boosting problem

cre · 11-25-2009, 07:58 PM

Begin with checking for error codes. Then start looking for vacuum leaks; An intake leak would probably cause you to run worse after 2.5K and not before.

Check for diagnostic codes: http://www.cygnusx1.net/Supra/TechTi...ror_codes.aspx

Why was the car sitting for 10 years? Blown head gasket? If so, the bearings have probably eroded and you may have some significant rod knock.

The stock turbo begins spooling around 2K and all turbos spool faster if you're running rich (it's a tuning trick actually)... cooler air is denser and richer air is denser.

dunewarz · 12-05-2009, 02:57 AM

Sitting for 10 years? Well there so many things you need to check. Especially after taking it up to 110 mph. I'd start with the simple stuff like spark plugs, wires, gaskets, filters, etc. Then more complicated stuff like fuel pump, head gasket, and cylinder head itself.

MA70-3.0GT · 12-06-2009, 02:57 PM

You still here nutz? What happened with the boosting problem?

*sigh* I hate not having closure on an issue...

12-06-2009, 02:57 PM	#3
MA70-3.0GT 12psi boost Join Date: Oct 2009 Location: Crewe, England Posts: 356	You still here nutz? What happened with the boosting problem? sigh I hate not having closure on an issue... __________________ '89 MA70 Supra GT aero 3.0turbo JDM, Rebuilt motor, K&N intake, 3" stainless turbo-back. New turbo and braided line kit... '89 Honda NC27 400, NC23 cams, open pipe, PC36a shock & possibly Showa USD forks... '83 Yamaha 29R XJ750E-II, number 69 off the line, only runner in the country? Original except Koni shocks '95 Honda PC26 CB500R, Winter hack, hateful, trying to sell it I'm not paranoid, they really ARE after me!!!

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11-25-2009, 07:58 PM	#1
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Begin with checking for error codes. Then start looking for vacuum leaks; An intake leak would probably cause you to run worse after 2.5K and not before. Check for diagnostic codes: http://www.cygnusx1.net/Supra/TechTi...ror_codes.aspx Why was the car sitting for 10 years? Blown head gasket? If so, the bearings have probably eroded and you may have some significant rod knock. The stock turbo begins spooling around 2K and all turbos spool faster if you're running rich (it's a tuning trick actually)... cooler air is denser and richer air is denser.

12-05-2009, 02:57 AM	#2
dunewarz 3" Exhaust Join Date: May 2009 Location: WhiteBear Posts: 54	Sitting for 10 years? Well there so many things you need to check. Especially after taking it up to 110 mph. I'd start with the simple stuff like spark plugs, wires, gaskets, filters, etc. Then more complicated stuff like fuel pump, head gasket, and cylinder head itself.