Hello all

Well my husband and I registered on the forum about 4 months ago, and have finally purchased a 1996 Supra that has been upgraded to a T-67 Turbo.
So I have a few questions. First off I got the car about a week ago, have driven it for two days, and the radiator cracked today. It is the stock radiator, so should I be looking to upgrade? If so, what kind should I get and how much am I looking at spending?

Also, I know that the car was originally N/A, but the guy I purchased it from did a JDM TT engine swap. He put a 5 speed RPS Transmission in, why do you think he did this? I would personally rather have a 6 speed, would it be worth the investment?

He also put 2.75 Cams in it. I am not sure how much of a difference this makes, but thought I would ask.
My husband is in Afghanistan, so I am trying to get the car fixed and ready to make a cross country trip with me so I can see him for R&R. I would really love for nothing to go wrong while I am driving out in the middle of nowhere. Please let me know what you all think that I should be doing. I know a lot about cars, but no where near enough to start really playing with this beast!

Thanks
Alli

for the radiator, fluidyne has proven its self to be one of the best if not the best. PWR is another good one. dont buy another stock radiator, on a big turbo like that youll just be asking for problems.

the 5spd tranny isnt very strong but the tranny swap will cost you some money. however you wont be able to get the full potental from the car with that 5spd.

the cams make a big difference in top end power however the t67 doesnt benefit as much from long duration cams as bigger turbochargers do but they do make a difference.

Well thanks for the quick reply. Here is a list of mods. Engine swap to JDM Aristo clip (There is 48K miles on engine and 112K miles on chasis), Upgraded to single turbo T67 w/ custom manifold/ turbonetics open wastegate, Upgraded injectors (720 cc)w/ HKS fuel rail, HKS Intercooler setup w/ piping, New AEM ecu with tuned/dyno tested map, Greedy Profect B 2 electronic boost controller, HKS turbo timer, Added fuel pump for fuel system, New Cams both 2.75, New Valves ...all 1 mm over specs, /exh and intake, New muffler...HKS Hi Power minus resonator, six picked clutch and disk RPS, 5 speed transmition, K&n cold air intake cone / 4 inch diameter, HKS SQ Blow Off Valve x 2
My main concern is that the rear end was never replaced so im guessing that it still has the 4.10 rear end. At 80 mph im at 4000 RPM which takes away from what makes the supra what it is. In my mind a supra is all about raw power and top end. Also in about a year i will be sending the supra to Germany for the remainder of my tour. So if anyone has been on the autobahn were there is no speed limit, i would like to be able to go alittle faster than 100 mph. Would hate to be smoked by all those BMWs and Audis. I was wondering how hard it would be to put in a 3.23 rear end. Im pretty sure that is what the 6 speed turbo has stock. If not does anyone know what my best choices are. I would love to go all out and put in a 6 speed, but money doesnt grow on trees and i could live with the 5 speed for a few years. The previous owner claims that at 15 psi im running almost 500 at the wheels, not so sure about that. Well anyway i have about a month to get this all done before i have to drive 2000 miles in it. thanks in advance for all your help.

This message has been edited. Last edited by: Lewis05,

yea that rear end needs to go. the rear from an auto is like 3.77 and since you have a 5spd adding the long 3.23 might be overkill. if you know the size of your tires and the gear ratios of the tranny you can find out which final gear will do what you want. your car is making plenty of power so i wouldnt worry about getting beat by those damn germans...until you got to about 145mph and your gearing was topped out with the 4.10 gear . i think 500whp at 15psi is a bit of a stretch, however at 18psi the 67 can make 500whp.

Well thanks again you have been alot of help for me. Yeah i figured it wasnt at 500 yet. My goal is the SP63 from sound performance but thats in the future. So you think the 5 speed with the 3.23 would be the wrong combo. Well this still leaves me with my problem and with the setup now i dont like it, So its got to go. Guess i will have to do some research on what i should drop in and how much it would cost me.

my advice, leave the turbo the engine alone and just change the tranny out. the t67 is a great turbo and a sp63 will be a downgrade. plus you already have a tuned AEM, cams, head work, the whole nine yards. i missed something in your post about the RPS tranny. i have never heard of an RPS tranny. i know they make clutchs but i didnt know they made transmissions.

I Agree with you about the turbo and engine. Im just a huge fan of SP and im into track and street ability not big dyno #s. I will wait until the T67 is feeling ill then worry about turbos. About the RPS i was on the same page as you, but the previous owner said it was a new 5 speed. I found out that he never did the swap, and its still the NA 5 speed. I would love to do a tranny swap but money is an issue. Cant afford $3000 now, im still paying on the car. Just want to get it running good before i worry about tweaking it. I was thinking about just changing the rear gears, because even a diff is like 1600 and thats more than i want to pay. If i could get some rear gears it should only be around 600. My wife is the one with the car, and im in Afgan so its hard to get anything done. She cant do the work so she will have to have it all done by a shop. So i have to think of labor costs as well, just happy the supra comunity is here to help. Thanks again for all your info

This message has been edited. Last edited by: Lewis05,

if you were in the US a rear diff would be easy to find. for now just change the diff and the radiator and try not to put too much power through the 5spd and you should be ok for some time.

Yeah that is what i have also decided. I just hope the NA 5 speed will hold with all that HP. I will have my wife start looking for a rear end. From toyota i think they are like around $1600 for the diff. Do you know if i could just replace the gears? Also where would be the best place to search for these. Guess you are the only one on the forums now lol.

dont buy a new diff from toyo if you can avoid it. try searching salvage yards. i see that you are in TX so try using car-part.com to find it. i think youll have to chage out the half shafts too but im not sure.

The only thing im confused about is that if you buy just the gears for the rear end, which are only 549 instead of a diff whitch is around 1600 it says for 6 speed only. Hmm i dont see why it would really make a difference, and why would i need to change out the shafts. This subject seems to be hard to find info on.
A perfect upgrade for modified Supra's needing an extra bit of acceleration from a stop or when exiting a corner on the racetrack. This 3.27:1 ratio gear set is a direct replacement for the factory 3.13:1 gear set. Top speed will be reduced by about 5-10 MPH at most, but the increase in low end acceleration is much worth it! Fits the TT Supra six speed manual transmission only. Price: $549 Well i would have no problem buying this, but do you think it would work with the NA's 5 speed.

the diff for the 5 and 6spds are different and i dont think you can use them. talk to whoever is offering these gears and ask them if you can use them.

Ok...so now the problem is my radiator. I bought the Fluidyne and had a local radiator shop install it. I went to pick it up today, drove 5 miles and the engine overheated. I opened the hood to find the coolant in the overflow boiling. So I called the radiator shop and they said that it was nothing that they did, but I probably blew a headgasket when my old radiator went on me.
So with this on mind, I called MZM performance located in Austin. I have been planning on taking the car down there, but without the radiator it seemed pointless. So the owner asked whether the guys at the radiator shop bled the air system...to which they gave me a very confused look.
So to make matters worse, I am having it towed from Temple to Austin to MZM tomorrow, but I was hoping that you all might have some insight on what might be wrong.
When my old radiator cracked, I saw my water temp going up and quickly pulled over and turned the car off. It was not near the Red line, so I can't see how I damaged a headgasket.
oh well, if anyone has a suggestion, please add it!
Thanks
Alli

what kind of coolant did the shop use? check the compression before you assume its a bhg. i think you might have to hold the shop responsible for a poor install.

The shop used Prestone Coolant.
But I am going to agree with you on the poor install. I had the car towed to MZM. I have so many leaks in the hoses to my coolant system that they can not do a compression test. So I have to pay an absolutely crazy price to have just about ever hose and seal replaced on my coolant system. Could the pressure in the system cause holes in my hoses? That is the only thing that I can think of. I know for a fact that before the supra went in to have the new radiator put in, that there were no visible leaks from any hosing. So could I slam the radiator shop with that as well?
Well I have learned my lesson about taking a nice car like this to a hole in the wall radiator shop, just trying to save a few bucks.
Thanks Supras_own_you, you have been a great help
Thank

quote:

Could the pressure in the system cause holes in my hoses?

that depends on the condition of the hoses, if they were brittle then yes. the shop may have used old hose for the install or they may have cut the hoses to get them off of the old rad. how much did the radiator shop charge you?

btw: when you are replacing the hoses change out that prestone fluid for toyota fluid and distilled water.