Vacuum line layout for 1989 JDM turbo?

MA70-3.0GT · 11-12-2009, 05:06 PM

As per the title really, I've been going off USDM photos & diagrams for the vacuum pipe routing on my '89my JDM Supra with 7m-gte lump & while I think it's pretty much there I'd really appreciate if someone has, or could point me in the direction of, some photos or diagrams for the JDM model.

The main difference is the lack of charcoal canister etc on the JDM & the fact that it's RHD so the servo, cruise etc are on opposite sides. Like I say, it's pretty much there but anything that shows the actual JDM setup would be brilliant just to confirm everything...

Cheers, Dan.

cre · 11-12-2009, 07:13 PM

JDM had the charcoal canister too. EGR is the only thing it didn't have. The ECU was different to make up for the lack of EGR, it pulled timing and added fuel where the EGR system was active on EGR equipped vehicles.

I don't know where to find the diagrams for the JDM engine though. Sorry.

MA70-3.0GT · 11-13-2009, 12:53 PM

Quote:

Originally Posted by cre

JDM had the charcoal canister too.

As far as I can tell mine doesn't unless it's hidden, a different shape & plumbed from somewhere else, as the nipple that the vac supply is taken from on the USDM is non-existent (not blanked, just undrilled.). Anyway I think the lines are pretty much there or thereabouts, certainly not wrong enough to be a cause of the no-idle fault anyhow. Can't wait till tomorrow now so I can throw a gallon of juice in it & see if setting the TPS & fitting the recirc. valve back cures anything.

If not then I'll pull the codes again after it's run for a while & see what happens. Oh, and check the ISCV, EFI relay/resistor, rail pressure & cold start injector, plus the other bits I wrote down the other night to look at.

I'll let you know what happens either way, thanks for the help so far.

Cheers, Dan...

cre · 11-14-2009, 12:31 AM

Ok, looking at some pics I see there is no supporting hardware for the CC... There's no vacuum port, nor is there a CC. I've sent an email to a friend who works for Toyota and I'll let you know what he has to say... maybe he can get the diagrams. The line from the fuel tank needs to be routed somewhere.

EDIT: I'm still waiting to hear back, might not be for a day or so. BUT, while I was walking my dogs it hit me... there are two ports on top of the North American MKIII's (dunno about the models there). One port is for the CC and the other is for the EGR. As we know the JDM has no EGR it is still possible it has the CC, it would be routed differently as it would be located on the opposite side of the bay. I'll let you know when I find out more.

cre · 11-14-2009, 06:48 PM

Quote:

They used a much smaller charcoal canister mounted lower down. There was no BVSV used on the Japanese 7M-GTE, the vacuum line went directly to the canister.

He's going to email me the vacuum diagrams he has. Get me your email address and I forward them to you when I get them.

So, since your engine doesn't have the CC connected to the top port, what is connected there?

cre · 11-14-2009, 07:57 PM

CC does connect to the top of the TB... it's not entirely evident here.

Here are two PDFs (from the Toyota parts catalog): one is for the CC and associated fuel line routing; the other for the general vacuum layout.

http://www.fadingworld.com/CRE/_Auto...ap%20Lines.pdf
http://www.fadingworld.com/CRE/_Auto...%20Diagram.pdf

11-12-2009, 05:06 PM	#1
MA70-3.0GT 12psi boost Join Date: Oct 2009 Location: Crewe, England Posts: 356	Vacuum line layout for 1989 JDM turbo? As per the title really, I've been going off USDM photos & diagrams for the vacuum pipe routing on my '89my JDM Supra with 7m-gte lump & while I think it's pretty much there I'd really appreciate if someone has, or could point me in the direction of, some photos or diagrams for the JDM model. The main difference is the lack of charcoal canister etc on the JDM & the fact that it's RHD so the servo, cruise etc are on opposite sides. Like I say, it's pretty much there but anything that shows the actual JDM setup would be brilliant just to confirm everything... Cheers, Dan. __________________ '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!!!

11-14-2009, 12:31 AM	#4
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Ok, looking at some pics I see there is no supporting hardware for the CC... There's no vacuum port, nor is there a CC. I've sent an email to a friend who works for Toyota and I'll let you know what he has to say... maybe he can get the diagrams. The line from the fuel tank needs to be routed somewhere. EDIT: I'm still waiting to hear back, might not be for a day or so. BUT, while I was walking my dogs it hit me... there are two ports on top of the North American MKIII's (dunno about the models there). One port is for the CC and the other is for the EGR. As we know the JDM has no EGR it is still possible it has the CC, it would be routed differently as it would be located on the opposite side of the bay. I'll let you know when I find out more. Last edited by cre; 11-14-2009 at 01:01 AM.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Where is this vacuum line saposed to connect to?	mkiiisupra	MKIII Supra	15	07-15-2010 05:15 AM
Is this a vacuum line?	Paul_NJ	MKIII Supra	3	04-18-2009 10:32 PM
HELP PLEASE	Nick0887	Non-Generation Specific Questions	4	02-28-2009 07:26 AM
Dream Offer	Karma_Supra	MKIV Supra	22	10-17-2007 03:04 PM
Sequential Turbo Question	suprapoweredsoarer	MKIV Supra	1	06-06-2006 12:13 AM

11-12-2009, 07:13 PM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	JDM had the charcoal canister too. EGR is the only thing it didn't have. The ECU was different to make up for the lack of EGR, it pulled timing and added fuel where the EGR system was active on EGR equipped vehicles. I don't know where to find the diagrams for the JDM engine though. Sorry.

11-14-2009, 07:57 PM	#6
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	CC does connect to the top of the TB... it's not entirely evident here. Here are two PDFs (from the Toyota parts catalog): one is for the CC and associated fuel line routing; the other for the general vacuum layout. http://www.fadingworld.com/CRE/_Auto...ap%20Lines.pdf http://www.fadingworld.com/CRE/_Auto...%20Diagram.pdf