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Posted - Dec 18 2002 : 5:46:54 PM
whats up everyone, i was hoping someone might make a forum specially for those that want to turbo their cars, thanks Aaron.
i have several questions, first off, if i turbo my 1987 rx7 will it be as fast as a TII? also i hear that you have to becareful because you can easily damage the car.
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| 15 L A T E S T R E P L I E S (Newest First) |
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Posted - Dec 24 2002 : 8:20:34 PM
Also these little plugs things seem to like snapping the heads aways from the threaded bit!! but luckily I could get some spare ones from my local radiator place..
so be gentle if thats the plug your taking out
(talking about the ones in the radiator, not the engine plug..)
Edited by - White_FC on Dec 24 2002 8:22:34 PM |
| Aaron Cake |
Posted - Dec 24 2002 : 11:28:29 AM
You mean the one on the drivers side in the engine mount?
You can reach it from above with an opened end wrench. It's a little annoying, but pretty easy once you've got the technique down.
If you mean the one on the rad, there is a hole on the plastic underbelly pan that has a little cap. Pop out the cap then use a large phillips screwdriver. Be careful not to strip the plug, as Mazda does not sell that part (they make you buy a whole rad).
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Posted - Dec 22 2002 : 9:18:39 PM
ok..i know this has nothing to do with the turbo, but you are just sooo knowledgeable, here it goes:
what do i have to take out in order to reach the coolant drain plug from underneath my engine?? i took that shield out and i still cant reach it.is it suppost to be this difficult to reach?
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| Aaron Cake |
Posted - Dec 22 2002 : 11:44:49 AM
The '90 turbo will fit as long as you use the '90 manifold. The S5 turbo are actually a lot better then the S4 units. Much better wastegate and flow.
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Posted - Dec 22 2002 : 04:15:33 AM
let me ask you something...willl any year turbo from an rx7 fit into my 87 n/a? lets say a 1990 rx7 turbocharger to be exact
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| Aaron Cake |
Posted - Dec 21 2002 : 11:56:19 AM
Well, I feel obligated to mention that it will most likely be cheaper to just buy a TII, then it would be to buy an NA and turn it into a TII. Also, turbocharging the NA will be $2000 at least.
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Posted - Dec 20 2002 : 12:22:19 AM
i would buy a Tii..but i havent seen any in houston..not even on the roads..there was one for 1500 but it sold..i have no clue about the condition it was in...so intead i was thinking about either turbo'ing the n/a..or just turning it into a TII....
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Posted - Dec 19 2002 : 10:51:50 PM
I do not have a turbo N/A, yet. I have been researching it sence May. My 88 vert will most likely go into the garage in late January for an engine swap. A rebuilt engine will be put in with 8000 miles on it.
The reason I am doing the turbo N/A is because I have a vert. If not I would just buy a TII. Many other reasons I am doing it but, to many to list.
If you like to tinker, have something unique and money is not tight then the Turbo N/A is the way to go. If you want to just have a fast car go with buying a TII. |
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Posted - Dec 19 2002 : 10:18:23 PM
also...do you know where i can get a Tii motor from?
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Posted - Dec 19 2002 : 8:23:13 PM
by the way...aaroncake..thanks for making this forum..its exactly what i was looking for. Rx7club.com doesnt have this...and its great so far
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Posted - Dec 19 2002 : 6:33:49 PM
i did check it out..and let me add it was very helpfull, im debating right now weather i should just save up and buy a Tii or start buying the parts to convert mine into a Tii or just drop the turbo. Right now the hardest seems to be dropping the turbo. Lack of money has a huge impact on my decision.
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| Aaron Cake |
Posted - Dec 19 2002 : 09:29:35 AM
A few comments:
1. The turbocharged NA would be faster then the TII at equivalent boost due to the higher compression ratio.
2. The compression ratio of the 89-92 turbo rotors is 9.0. The compression ratio of the 86-88 non turbo rotors is 9.4. At about 10 PSI on the 9.0 turbo rotors, the compression is the equivalent of about 8 PSI on the 9.4 non turbo rotors. There are a lot of 89+ turbos running more then 10 PSI.
3. The NA ECU knows nothing of boost, so it cannot deal with fuel and ignition requirements. Solving the fuel problem is easy by adding larger injectors and a bigger pump. An S-AFC works very well for control. Ignition can be manually retarded, electronically retarded (CDI box with boost retard option), or left alone. Currently, my timing is stock. I did not appear to have any timing related problems at 10 PSI, though this spring (after the port job and 3" exhaust) I will be adding a boost sensor to my Crane HI-6 to enable retard on the leadings. At this point I will also be considering setting my S-AFC as boost referenced instead of TPS referenced.
4. Because of the higher compression and ECU, it is easier to damage the turbo-NA engine then it is the TII engine. I have had some severe detonation when I did something stupid, but have seen no damage to the engine. Still makes excellent compression. However, another forum member, Bambam7, has toasted his rear rotor through detonation. I don't know the exact circumstances, but bear in mind that he turbocharged the '89+ engine, which has much higher compression (9.7) and that horrid electronic metering oil pump.
5. It sounds like you have not checked out my turbo-NA page. It would definitely be beneficial for you to do so. http://www.aaroncake.net/rx-7/naturbo.htm
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Posted - Dec 19 2002 : 06:37:20 AM
yeah i know...but that high compression kinda scares me..everything has to be perfect. no way i can buy the stuff and you ship it to good ol' houston texas huh?? :) haha
by the way, do you know where i could find a good Tii motor?
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Posted - Dec 19 2002 : 04:33:28 AM
Well for me it will work out cheaper to turbo my 6port engine, because I got alot of the parts very cheap. Ie,(in Australian$) $85 for the turbo, $150 for 3l supra intercooler (bigger than rx-7) and pipeing, manifold was free(custom manifold, doesn't need spacer) currently buying some fuel system upgrades now..
However you might have a different situation and might not be able to get parts at these prices, so it might be cheaper for you to buy a TII engine. But the TII engine doesn't have the high compression our motors do. 
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Posted - Dec 19 2002 : 04:10:48 AM
icic... would it be cheaper to just turn the car into a TII?? or add a turbo ?
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