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Index > Engine/Drivetrain > Thread: 13B from GSL-SE in REPU
Thread: 13B from GSL-SE in REPU [' This thread is 2 pages long: (1) 2 ']
Rotary_Pickup


Hauling
Posts: 117
posted September 23, 2006 07:13 PM

13B from GSL-SE in REPU

I just picked up a 13B engine from a 1985 GSL-SE. How do I fit this into my 1977 REPU and maintain for factory fuel injection from the GSL-SE?
____________
KansasCityREPU on RX-7Club.com
85 GSL
77 REPU (1/1/2004)
75 REPU (7/10/2004)

       
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klaus42


Rotorhead
Posts: 1877
posted September 23, 2006 09:48 PM

Get *everything* from the SE.

All the electronics, sensors, everything. Perhaps even a bit of the harness that connects to all of it.

You'll also need your stock REPU oil pan and front cover, I think to recall...

I might be able to take some pics of the one I have that has the stock SE installed to help you with the wiring.

The Racing Beat header, adapted for the sensors, would be preferred...

       
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sparky


Redlining
Posts: 299
posted September 24, 2006 07:19 AM

Why would you want ro retain the the factory fuel injection? I had a gsl-se engine in my REPU for a while. If you take off the fuel injection and go with a good carburator and header you will easily get 180 HP out of the set up. Factory fuel injection on that engine is good for 140 HP. I remember something about restricted airflow to engine due to upper intake manifold design. Install and set up will be easier. I had the Dellorto carb on my repu. Good luck.
____________
'77 REPU
Stock 6-port
T-2 tranny
Weber IDA 48
Alum Flywheel
3rd gen Torsen in rear end.
DLDFIS ignition

       
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klaus42


Rotorhead
Posts: 1877
posted September 24, 2006 09:40 AM

It came to me that way...

...and it works, and I've yet to alter that. That's *my* only exuse!

       
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Rotary_Pickup


Hauling
Posts: 117
posted September 24, 2006 06:41 PM

An after market manifold and carb would be the easiet, but I need to keep cost down. Does anyone make a six post manifold for an after market carb? I guess another option would be to get a 6 port to 4 port adapter and use the stock carb. I already have a header.

My plan was to remove as much smog stuff I could. I had to cut the wireing harness at the firewall. I can still get the rest but would need to take the dash out.
____________
KansasCityREPU on RX-7Club.com
85 GSL
77 REPU (1/1/2004)
75 REPU (7/10/2004)

       
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klaus42


Rotorhead
Posts: 1877
posted September 24, 2006 09:06 PM
Edited By: klaus42 on 24 Sep 2006 21:07

Racing Beat's

...'wrap over' manifold for Dellorto, etc., is a two-piece design, the upper section of which bolts directly to the lower section of the stock 6port manifold, if I remember correctly.

There is also an aftermarket manifold out there suitable for Holley, etc. 4barrels...

If you *do* want to run the stock fuel injection, I hope you got the ECU, and all the sensors. In this case I'd suggest you get her set up and running well in full stock trim, before you start removing stuff...

       
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Rotary_Pickup


Hauling
Posts: 117
posted September 25, 2006 10:16 AM

The wrap-around design seems to be the way to go. Less headache with trying to get all the factory wiring for FI in place.
____________
KansasCityREPU on RX-7Club.com
85 GSL
77 REPU (1/1/2004)
75 REPU (7/10/2004)

       
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troyjmueller


Revvin Up
Posts: 55
posted November 28, 2006 05:39 AM

Oil pan fyi

FYI, the 84 & 85 GSLSE 13B were a front-mount engine, with a plane-jane front-sump oil pan identical to the 12a except for length. The GSLSE 13B's do not need to have the oil pan swapped. The change came in 1986, when the engine mount point shifted to mid-engine.
____________
5 Toyota Trucks
4 Spare drivetrains
3 unfininished projects
2 Toyota RV's
and
1 1974 REPU "Loudmobile"
1 1975 IHC Schoolbus
1 1987 B-2000 'Mazda T' project
all in a pear tree.

       
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mazdaorbust


Revvin Up
Posts: 82
posted December 14, 2006 02:49 PM

13B GSL-Se swap

What did you decide to do? I just purchased a 75 repu and find myself in the same boat. I purchased a 13b out of a 85 GSL-SE with only 44K miles on it which has been in basement for the last 2 years. It was a deal I couldn't let go. I am not sure if I want to keep it EFI or change it. I plan on driving often so I want something reliable.

       
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Rotary_Pickup


Hauling
Posts: 117
posted December 14, 2006 04:33 PM

I won't get to my project for a while (building 1985 RX-7 right now). I'm going to give the factory EFI a shot. I have the computer and harness so why not. If it doesn't work then I can also go with an upper manifold and weber carb.
____________
KansasCityREPU on RX-7Club.com
85 GSL
77 REPU (1/1/2004)
75 REPU (7/10/2004)

       
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trochoid


1st Gear
Posts: 19
posted December 15, 2006 02:46 AM

How many fuel pumps do you plan on buying? If you retain the stock fuel injection, you will need an FI pump. If you change your mind and go carbed, then you would need an upgraded from stock carb pump.

Most people who strip an FI body to swap into a carbed one miss little parts, sensors, relays, harnesses here and there. It can drive a person nuts gathering all of them up if they don't have the donor body on site.

Going carbed is simpler to install, can be cheaper with careful buying of needed parts used and has more hp potential. With the stock FI and ecu, you are pretty much stuck with the stock 135 hp, plus whatever you can gain with headers and exhaust. The only real advantage of keeping the FI, imho, is you can retain working auxillary ports and keep the low end torque they offer.

       
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sparky


Redlining
Posts: 299
posted December 15, 2006 10:42 AM

quote:
The only real advantage of keeping the FI, imho, is you can retain working auxillary ports and keep the low end torque they offer.

Not true...the dellorto carb I used to have on my gsl-se had an upper intake that bolted onto the factory lower intake manifold. It retained the factory aux. ports. I had to weld a pressure sensing line into the exhaust after the header for aux. port actuators. Worked great. Great low end torque and still revved like a screaming monkey.
____________
'77 REPU
Stock 6-port
T-2 tranny
Weber IDA 48
Alum Flywheel
3rd gen Torsen in rear end.
DLDFIS ignition

       
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mazdaorbust


Revvin Up
Posts: 82
posted December 15, 2006 04:43 PM

motor swap

What would give better performance/response dellorto carb or holley? I have driven rotary's with holley's never with dellorto carbs.

       
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trochoid


1st Gear
Posts: 19
posted December 16, 2006 02:29 AM

quote:
quote:
The only real advantage of keeping the FI, imho, is you can retain working auxillary ports and keep the low end torque they offer.

Not true...the dellorto carb I used to have on my gsl-se had an upper intake that bolted onto the factory lower intake manifold. It retained the factory aux. ports. I had to weld a pressure sensing line into the exhaust after the header for aux. port actuators. Worked great. Great low end torque and still revved like a screaming monkey.


True, I forgot about the aftermarket uim for the 2 barrels. I'm used to the 1 piece ones.


quote:
What would give better performance/response dellorto carb or holley? I have driven rotary's with holley's never with dellorto carbs.


Holley vs Mikuni, Dellorto, Weber, I'll take the 2 barrels any day over a Holley. The only '4 barrel' that's better than 2 is the 36 mm DCDs.

       
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tom93r1


Redlining
Posts: 457
posted December 18, 2006 11:04 AM

Are the 4 barrels like Holley any less sensitive to climate and elevation changes? My Weber 48 DCO is tuned I believe perfectly now after I have been messing with jets the last few weeks. I took it up in the mountains for about a 4000 foot change and it ran like crap. Would cruise nice but it would missfire and pop bad whenever I would get on it. Kind of sucks when you cant get on the accelerator in the mountains. I should have pulled over and rejetted but my girlfriend wouldnt have appreciated that.

I will say however that I am really happy with the power I get and I love the sound and simplicity. Suppose it all depends on what you are wanting to do with your REPU as to which is better.
____________
http://azrotaryrockets.com

'74 lawn-green
4-port 13b
Weber 48DCO
Racing Beat Header
Magnaflow resonator/amplifier
really loud!

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BadAssRX-7


1st Gear
Posts: 49
posted April 01, 2007 06:09 PM

gsl-se motor in 74

my 74 has a gsl-se block with the 6 ports opened, f.i. blocked off and a dellorto 48 dhla on it. r.b. exh and other than the slipping belt issue i dont have any "issues" with the setup. i have also done the external reg. rewiring and slaped in a 90 rx7 alt. with dual pully
____________
83 limited edition rx7...T2 SWAP ON HOLD, 89 vert d.d., 74 rusted repu with 6port & Dellorto, 05 ZZR600

       
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sparky


Redlining
Posts: 299
posted April 01, 2007 07:43 PM

I had the same setup on the 74 I used to have. It was FAST. I wish I could have done the DLDFIS ignition mod on the truck.
____________
'77 REPU
Stock 6-port
T-2 tranny
Weber IDA 48
Alum Flywheel
3rd gen Torsen in rear end.
DLDFIS ignition

       
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klaus42


Rotorhead
Posts: 1877
posted April 02, 2007 09:44 AM

Did that setup...

...completely tank the mileage, (besides being FAST...)?

Don't get me wrong, FAST is Great... but, being able to get decent mileage whenever not putting it all to the floor would be nice, too.

       
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BadAssRX-7


1st Gear
Posts: 49
posted April 07, 2007 12:06 AM

i had the dellorto setup on my 81 rx7 and streetported large. with the stock 12a jetting i had no power gain but got 28mpg on a road trip from atl to ohio, i had 2 sets of jets so i could rejet for power and with 165.1 at the wheels i was getting around 12 mpg.
now the setup in my repu im getting BAD milage reasons im thinking... 1 70-80 mph with the stock 4 speed is revin high... tachs busted... 2 i love the revs it will do when i floor it... and it sounds nasty. im sure if you had a 5 speed and drove normally it would do ok on milage

       
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MattREPU


Newbie
Posts: 6
posted April 07, 2007 01:38 PM

I have an SE motor with very mild porting on the primary ports. With a 48mm Dellorto on the SE lower, it worked well. Ran a 15.8 1/4 mile spinning little tires all of the way through 2nd gear. I got like 17+ mpg driving halfway accross the country at 70 mph. That with a ribcase 5-speed, and 600 lbs of crap in the bed.

I am not sure if economy improved with the SE EFI, but it was definatly less powerful on the "big end", but had a little better torque in the bottom. Overall, I like it better... No warm up, no icing. Right now I am fabricating parts to adapt an 87 style T-II turbo to it... 5 psi should be enough to disolve my worries of the lost power of the big carb, without destroying anything!

I'll try to dig up my notes from this swap. I did it much better than the one in my 83 several yrs ago. I layed the whole harness out, cleaned it, ohmed it out and really studied it and the diagrams. The end result was all of the BS eliminated, and simple external electrical connections to the harness. (Single +12, Gnd, cranking signal, rpm.) My 83 looks like the hack job that it is, I'm almost affraid to even touch it!


-Matt
____________
74 REPU 6-port EFI
83 RX-7

       
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