New to Supra's had a few Q's

turbot11 · 03-30-2011, 08:45 PM

Thanks! I'll have him check the driveshaft and spare tire well too. I love the Daytona's too, I have 2 lol, also an Omni GLH and Shelby CSX (Dodge Shadow) He's never had a turbo car so not pushing it past 14psi would probably be a good idea. the seller says that once the headgasket went it was parked and hasn't moved since. He's going to look at it tommorrow so hopefully I can get a better idea of what condition it really is in.
Thanks Again for the info!

My88isGREAT · 03-30-2011, 09:15 PM

Sounds great only 85k original miles. Don't forget to open the back plastic "doors" in the rear hatch and put your hand down in the rear quarter panels to check for any standing water. I had no problem like that with the timing belt. I completely rebuilt mine on my own with some help from my dad (a Mopar fanatic) . The timing belt uses the tensioner to set it, make sure you take a pic of the cam gears at top dead center so when you put it back together you will know it is the same. Once you put the belt on and release the timing belt tensioner, you turn the motor over by hand 2 times, then check that it is right with no loose spots, or the same tension on both sides. If you need parts http://www.sipracingmailorder.com/servlet/StoreFront is the bomb and Rich is a great guy. Hope it works out for you Chris! If you get the car PM me and I'll mail you a factory shop manual for it. I like when people take initiative to get these cars going. I know where one is that is just setting and the guy will not come off it, and I am too broke to flash some money at him to change his mind.

cre · 03-31-2011, 01:23 AM

The 7M never came with an asbestos HG. (It's argued that the torque spec was for an asbestos HG, but that's not likely either due to other design factors.)

Here's an online version of the Toyota Service & Repair Manual for the MKIII:

http://www.cygnusx1.net/Supra/Library/TSRM/MK3/

It's for a '90 or '91, but the differences aren't too great.

EDIT: Oh, and I wouldn't go beyond 12psi or so really... 14psi and you're getting close to the peak efficiency of the CT-26 and on a hot day performance will suffer as may the hardware. Think of 14psi as the cap.

My88isGREAT · 03-31-2011, 01:58 AM

Cool, thanks for the link. Sorry thought it was asbestos, I was told the new ones you get OEM are way better (and could hold up possibly to 14psi) then what they come with 20 years ago though. The thing is everyone said "oh get a MLS head gasket" and its like "dude, I'm not even trying to boost it, just get it up to par so it will be reliable" I am running stock turbo on mine with no intention of changing it, just saying a composite is just as good for normal people. I have ass loads of power, cant wait to dyno.

turbot11 · 03-31-2011, 02:07 AM

Thanks, I'll know tommorrow if he gets it or not! If so I'll definitely hit you up, the manual will help when the head goes back on

Thanks again to all, everyone's been great and the info has been very helpful! I'll post back as to whether he gets it

cre · 03-31-2011, 05:25 AM

The problem really never was the head gasket; Yes, it has changed... the rings and jackets are all about 1mm beefier and I'm sure the materials have advanced as well.... But if you really think about it the average MKIII HG lasted 15+ years.

Sure, on a clean engine with a perfect deck and head the composite could take more than that. It's a matter of longevity though. Everything breaks, some things sooner than others. I wouldn't really go more than 12psi on a daily basis for the sake of the HG either. Whether it MIGHT hold up better than a lot of other people have experienced isn't something I like to bet my own engine on; I've been bit in the ass that way a few too many times in the past.

On a related note, when prepping for a composite head gasket you do not want a "smooth as glass" surface. Unlike the MLS HG the composite does better if it has the additional surface area and 'bite'.

My88isGREAT · 04-03-2011, 01:48 PM

Yes CRE, right again, the head bolts were not torqued good enough causing the head gasket to blow... All I know is I was told that the new OEM head gasket are much better then the original ones and there should be no problem if your not trying to boost the heck out of it. Also with ARP bolts torqued to 115 foot lbs, that bitch is not going anywhere.

03-31-2011, 01:23 AM	#3
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	The 7M never came with an asbestos HG. (It's argued that the torque spec was for an asbestos HG, but that's not likely either due to other design factors.) Here's an online version of the Toyota Service & Repair Manual for the MKIII: http://www.cygnusx1.net/Supra/Library/TSRM/MK3/ It's for a '90 or '91, but the differences aren't too great. EDIT: Oh, and I wouldn't go beyond 12psi or so really... 14psi and you're getting close to the peak efficiency of the CT-26 and on a hot day performance will suffer as may the hardware. Think of 14psi as the cap. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar ---> Last edited by cre; 03-31-2011 at 01:27 AM.

03-31-2011, 01:58 AM	#4
My88isGREAT Stock Join Date: Mar 2011 Location: somewhere Posts: 15	Cool, thanks for the link. Sorry thought it was asbestos, I was told the new ones you get OEM are way better (and could hold up possibly to 14psi) then what they come with 20 years ago though. The thing is everyone said "oh get a MLS head gasket" and its like "dude, I'm not even trying to boost it, just get it up to par so it will be reliable" I am running stock turbo on mine with no intention of changing it, just saying a composite is just as good for normal people. I have ass loads of power, cant wait to dyno. Last edited by My88isGREAT; 03-31-2011 at 02:08 AM.

03-31-2011, 05:25 AM	#6
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	The problem really never was the head gasket; Yes, it has changed... the rings and jackets are all about 1mm beefier and I'm sure the materials have advanced as well.... But if you really think about it the average MKIII HG lasted 15+ years. Sure, on a clean engine with a perfect deck and head the composite could take more than that. It's a matter of longevity though. Everything breaks, some things sooner than others. I wouldn't really go more than 12psi on a daily basis for the sake of the HG either. Whether it MIGHT hold up better than a lot of other people have experienced isn't something I like to bet my own engine on; I've been bit in the ass that way a few too many times in the past. On a related note, when prepping for a composite head gasket you do not want a "smooth as glass" surface. Unlike the MLS HG the composite does better if it has the additional surface area and 'bite'. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

04-03-2011, 01:48 PM	#7
My88isGREAT Stock Join Date: Mar 2011 Location: somewhere Posts: 15	Yes CRE, right again, the head bolts were not torqued good enough causing the head gasket to blow... All I know is I was told that the new OEM head gasket are much better then the original ones and there should be no problem if your not trying to boost the heck out of it. Also with ARP bolts torqued to 115 foot lbs, that bitch is not going anywhere. __________________ I don't even own a car, just here for the moral support and friendly people. The Dr. said its good for me. Have a supra day!!

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03-30-2011, 08:45 PM	#1
turbot11 Stock Join Date: Mar 2011 Location: Cramerton N.C. Posts: 7	Thanks! I'll have him check the driveshaft and spare tire well too. I love the Daytona's too, I have 2 lol, also an Omni GLH and Shelby CSX (Dodge Shadow) He's never had a turbo car so not pushing it past 14psi would probably be a good idea. the seller says that once the headgasket went it was parked and hasn't moved since. He's going to look at it tommorrow so hopefully I can get a better idea of what condition it really is in. Thanks Again for the info!

03-30-2011, 09:15 PM	#2
My88isGREAT Stock Join Date: Mar 2011 Location: somewhere Posts: 15	Sounds great only 85k original miles. Don't forget to open the back plastic "doors" in the rear hatch and put your hand down in the rear quarter panels to check for any standing water. I had no problem like that with the timing belt. I completely rebuilt mine on my own with some help from my dad (a Mopar fanatic) . The timing belt uses the tensioner to set it, make sure you take a pic of the cam gears at top dead center so when you put it back together you will know it is the same. Once you put the belt on and release the timing belt tensioner, you turn the motor over by hand 2 times, then check that it is right with no loose spots, or the same tension on both sides. If you need parts http://www.sipracingmailorder.com/servlet/StoreFront is the bomb and Rich is a great guy. Hope it works out for you Chris! If you get the car PM me and I'll mail you a factory shop manual for it. I like when people take initiative to get these cars going. I know where one is that is just setting and the guy will not come off it, and I am too broke to flash some money at him to change his mind.

03-31-2011, 02:07 AM	#5
turbot11 Stock Join Date: Mar 2011 Location: Cramerton N.C. Posts: 7	Thanks, I'll know tommorrow if he gets it or not! If so I'll definitely hit you up, the manual will help when the head goes back on Thanks again to all, everyone's been great and the info has been very helpful! I'll post back as to whether he gets it