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85 GSL-SE with an 86 TB and Intake Manifold??

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Old 09-12-04, 04:46 PM
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Question 85 GSL-SE with an 86 TB and Intake Manifold??

I have an 85 Gsl-se and just picked up...for free!...the intake manifold and tb (complete with hoses and adapter for the intake piping. My question is whether or not this will bolt on? Also, whether its worth bolting on, and if so, what is the gain? Thanks guys!

Oh, its from a N/A 86
Old 09-12-04, 05:34 PM
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Yes it will bolt on as long as you are using the top and bottom pieces of the intake. You will
need to block off a passage on your block that is behind where the acv sits, its about i.5 inches x 5/8 inch. If you do not block it off you will have an ehaust leak. Use the tps from the 86, has the same connector as the se does. Vacuum lines need to be cut to fit and some other very minor things. Use afm from se and adapt hose. Don't worry about 2 outer
ports for injectors, you will not be running fuel to them, only using your se's injectors.
Gain is approx 11-15hp. You will notice it versus se intake. rx7doctor
Old 09-12-04, 05:43 PM
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11-15HP gain? BS How you figure?

The 2nd gen gained 11 HP factory with the larger TB, intake, AFM, lighter rotors and better ECU.

So how can just the intake gain that much? Your AFM is still a restrictor. Not worth the work.

Show me a dyno sheet and I'll drink a shot of ATF
Old 09-12-04, 05:50 PM
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1). the 86 did not have the se's injectors, the ecu just processed better for mileage. 2). I said approx this is based on trying it myself and 30 years of modifying vehicles and the
improved throttle response and acceleration. 3). It's not too hard to do. Which brand of atf
do you prefer, maybe synthtic? lol rx7doctor
Old 09-12-04, 05:54 PM
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Forgot to add, that is with dumping the stock airbox and running an kn cone of the afm. rx7doctor
Old 09-12-04, 05:58 PM
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The 86 has 4 injectors with more flow than the SE's. ECU was more than just better mileage.
approximatly wrong, real world is a bit different. 3-4HP is what I'd say.
I put on a bigger garden hose to my faucet, can I get more water?
Old 09-12-04, 05:59 PM
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Calm down people, important thing is its better lol, and more still, that it can be done easily. Now either of you, how do u suggest I block off that exhaust leak i will have?

Last edited by XCros; 09-12-04 at 06:06 PM.
Old 09-12-04, 06:05 PM
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Max 7, since you have never done the modification and i have, and have probablly worked on more automobiles than you can count, don't disclaim it until you have done the work your self. rx7doctor does not make any claims he can't back .
Old 09-12-04, 06:12 PM
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then lets see some proof. I've done plenty of mods and homework.

using a 2nd Gen AFM in a GSL-SE - http://max7.rx-7.org/mods/mod-afm.htm
converting a 2nd Gen manifold to SE - http://max7.rx-7.org/mods/mod-intake.htm

Been there done that, I'm not saying that its not going to improve power, but not that much.
Show me a dyno "no butts allowed" and I will video the ATF shot.

I'm just tired of these over inflated HP increases, from the Mods I have I should have a hella lot more.
I have had 7 RX-7's so it's not just a one car instance.... and blaa blaa too, hehe
Old 09-12-04, 06:25 PM
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Ok max, lets see you answer xcros's question. I see that you have pictures of the conversion does not mean that you have done it. Sorry not done with the pissing contest yet, having too much fun. I'll pm xcross with the answer and he will tell you if it matches
yours. rx7doctor
Old 09-12-04, 06:50 PM
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Ok, I'll answer it "steps up to podium"

My fellow RX-7 owner...... Yes you can use the 86 intake on a 85 GSL-SE, does it just "bolt up"?
No, its not a bad swap but not just a bolt on swap and few things have to be tweaked to fit.
Is it worth bolting on? depends, what else have you done to the car? if this is your only mod, then no.
there are other things I'd do before and intake swap.
How much gain? Some, not the 11-15HP as mention above, yes there will be some,
If we got an 11-15HP increase from bolting on a 2nd Gen intake, I think more than
half of them on here would of have done the mod........

So XCros its a mod that can be done, can be worth it, and can have gains.
just not as easy as 1,2,3 and won't give you the effect of NOS.
Old 09-12-04, 07:23 PM
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Bummer, you disappeared, you still did not answer his question about blocking off the exhaust port. lol rx7doctor, that was more fun than man is allowed to have. rx7doctor
Old 09-12-04, 07:42 PM
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Ok, I'm back. I doubt my answer will match yours since there is more than one answer.

you can,
1. block it off on the block welding a piece of steel in there.
2. block it off on the lower intake manifold, weld on a piece of alumium.
3. Modify the 2nd gen upper to bolt to the GSL-SE lower thus not having to mod the port.
4. Use a modified T2 intake manifold
5. Use a series 5 lower as it is made similar to the GSL-SE which has that port.
6. Keep the GSL-SE intake as you can run 14's with it
Old 09-12-04, 07:45 PM
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Outstanding job max7, your not so bad after all, lol. rx7doctor
Old 09-12-04, 07:47 PM
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haha this thread is quite funny
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