1985 RX7 Single Turbo Build...
08-12-13, 11:18 AM
#227
Did you ever find the fuel pump issue? While I'm hooking mine up I had a thought, figured I'd check in with ya.
If you're using the Haltech to switch the ground for the fuel pump - where is the fuel pump getting its +12v? If you're running through the factory harness, and have a GSL-SE ECU still hooked up, it's entirely possible that the stock ECU is trying to control the fuel pump via the +12v line, meanwhile the haltech is cutting the ground in/out.
Just a thought, and I'm not sure if the oem computer cuts ground or power.
My fuel pump circuit was put into "always on" mode (some jumper somewhere), so it bypasses the gsl-se fuel pump relay.
If you're using the Haltech to switch the ground for the fuel pump - where is the fuel pump getting its +12v? If you're running through the factory harness, and have a GSL-SE ECU still hooked up, it's entirely possible that the stock ECU is trying to control the fuel pump via the +12v line, meanwhile the haltech is cutting the ground in/out.
Just a thought, and I'm not sure if the oem computer cuts ground or power.
My fuel pump circuit was put into "always on" mode (some jumper somewhere), so it bypasses the gsl-se fuel pump relay.
08-14-13, 09:38 AM
#228
35r 13b first gen
Thread Starter
iTrader: (3)
Join Date: Apr 2002
Location: Richland Center WI
Posts: 1,290
Likes: 0
Received 0 Likes
on
0 Posts
Did you ever find the fuel pump issue? While I'm hooking mine up I had a thought, figured I'd check in with ya.
If you're using the Haltech to switch the ground for the fuel pump - where is the fuel pump getting its +12v? If you're running through the factory harness, and have a GSL-SE ECU still hooked up, it's entirely possible that the stock ECU is trying to control the fuel pump via the +12v line, meanwhile the haltech is cutting the ground in/out.
Just a thought, and I'm not sure if the oem computer cuts ground or power.
My fuel pump circuit was put into "always on" mode (some jumper somewhere), so it bypasses the gsl-se fuel pump relay.
If you're using the Haltech to switch the ground for the fuel pump - where is the fuel pump getting its +12v? If you're running through the factory harness, and have a GSL-SE ECU still hooked up, it's entirely possible that the stock ECU is trying to control the fuel pump via the +12v line, meanwhile the haltech is cutting the ground in/out.
Just a thought, and I'm not sure if the oem computer cuts ground or power.
My fuel pump circuit was put into "always on" mode (some jumper somewhere), so it bypasses the gsl-se fuel pump relay.
08-14-13, 10:32 AM
#230
Hm. So the thing that jumps out from what you said - you put a relay in the wire from the battery to the fuel pump.
I have the haltech f9, which has two orange flying leads for fuel pump control. They can be hooked up to +12v or ground, all they do is interrupt a signal. On the F9, the relay is internal to the ECU, and the docs specifically state do NOT add additional relays.
Can you verify if your ECU has internal relay?
I have the haltech f9, which has two orange flying leads for fuel pump control. They can be hooked up to +12v or ground, all they do is interrupt a signal. On the F9, the relay is internal to the ECU, and the docs specifically state do NOT add additional relays.
Can you verify if your ECU has internal relay?
08-14-13, 01:41 PM
#232
OK so the Haltech harness should have its own relays - one of which is the fuel pump. I don't believe you need to add any additional relays to the fuel pump lines, which is what I was mentioning above.
from page 20 of the haltech E6k manual:
So if you've got the Haltech harness, with relays and fuses etc, no additional relay should be added to the fuel pump line.
from page 20 of the haltech E6k manual:
Flying Leads: Orange
The two orange wires are used to operate the fuel pump. When the Haltech E6K ECU
wants to operate the fuel pump it will close the fuel pump relay connecting the two
orange wires together. The diagrams show two examples of wiring the fuel pump. Do
not add extra relays to the fuel pump circuit.
The two orange wires are used to operate the fuel pump. When the Haltech E6K ECU
wants to operate the fuel pump it will close the fuel pump relay connecting the two
orange wires together. The diagrams show two examples of wiring the fuel pump. Do
not add extra relays to the fuel pump circuit.
08-20-13, 01:43 PM
#233
35r 13b first gen
Thread Starter
iTrader: (3)
Join Date: Apr 2002
Location: Richland Center WI
Posts: 1,290
Likes: 0
Received 0 Likes
on
0 Posts
OK so the Haltech harness should have its own relays - one of which is the fuel pump. I don't believe you need to add any additional relays to the fuel pump lines, which is what I was mentioning above.
from page 20 of the haltech E6k manual:
So if you've got the Haltech harness, with relays and fuses etc, no additional relay should be added to the fuel pump line.
from page 20 of the haltech E6k manual:
So if you've got the Haltech harness, with relays and fuses etc, no additional relay should be added to the fuel pump line.
08-20-13, 11:37 PM
#235
Gotcha. Yah man - I think you've found the solution - manual switch 
Seems like the ecu isn't sending the right signal to the fuel pump under low rpm conditions. Only thing i can think is bad circuit on the ECU fuel pump control circuit for low-rpm/start control condition.
Seems like the ecu isn't sending the right signal to the fuel pump under low rpm conditions. Only thing i can think is bad circuit on the ECU fuel pump control circuit for low-rpm/start control condition.
08-24-13, 12:53 PM
#236
35r 13b first gen
Thread Starter
iTrader: (3)
Join Date: Apr 2002
Location: Richland Center WI
Posts: 1,290
Likes: 0
Received 0 Likes
on
0 Posts
Driveshaft complete... 200 plus 105 after shipping for flange/ yoke from mazdatrix... 305 total... Guaranteed to to break/ bend/ fail... At 500rwhp... One day turn around
. We just bought a house 30 miles away so I gotta get my shaft in now so I can drive the 7 home before the end of the month... She be good now
. We just bought a house 30 miles away so I gotta get my shaft in now so I can drive the 7 home before the end of the month... She be good now
02-06-14, 01:43 PM
#238
Junior Member
Join Date: Feb 2014
Location: ct
Posts: 23
Likes: 0
Received 0 Likes
on
0 Posts
that thing is a real gem ma good job hey i was wondering i have an 85 gsl se and i always wanted to make it turbo my plan was to have the motor rebuilt or get a new block and then try and find a turbo charger that would fit with all my stock stuff (unless i needed an intake or some other minor stuff) so my ? is do they make a turbo that will work on my car without having to switch to 2nd gen equipment?? thanks
02-20-14, 10:09 PM
#239
35r 13b first gen
Thread Starter
iTrader: (3)
Join Date: Apr 2002
Location: Richland Center WI
Posts: 1,290
Likes: 0
Received 0 Likes
on
0 Posts
You will most likely have to piece your stuff together and have a lot of custom pieces.. Probably the simplest option is a t2 motor swap. I wish I would have just put in the engine I have now in the 1st place...
02-21-14, 11:10 AM
#240
Junior Member
Join Date: Feb 2014
Location: ct
Posts: 23
Likes: 0
Received 0 Likes
on
0 Posts
yeah i wasnt looking to do to much custom stuff i wanted bolt up parts i love this car to much to change it to far from stock mabey i just figured because its a 13b fuel injected that it wouldnt be to far off what you would need, i always heard the rear ends and trans dont hold up once you turbo your first gen if you leave those stock so it sounds like to much trouble but i realy would love a turbo in the first gen body style tho its the best of both
02-21-14, 03:31 PM
#241
rear end and trans of the gsl-se will hold up fine for around 200-250hp to the wheels if you drive and shift smoothly. More than that you may want to start swapping stuff.
Because you have the GSL-SE with fuel injection, a lot of work is already done - you have a gas tank that is baffled to deal with more G force under acceleration, a high flow fuel pump, and large (enough) diameter fuel hard lines.
You'd definitely want to do the TII swap rather than piecing things together, if you're going turbo. Or FD swap if you want even more goodness
Because you have the GSL-SE with fuel injection, a lot of work is already done - you have a gas tank that is baffled to deal with more G force under acceleration, a high flow fuel pump, and large (enough) diameter fuel hard lines.
You'd definitely want to do the TII swap rather than piecing things together, if you're going turbo. Or FD swap if you want even more goodness
02-21-14, 11:32 PM
#242
35r 13b first gen
Thread Starter
iTrader: (3)
Join Date: Apr 2002
Location: Richland Center WI
Posts: 1,290
Likes: 0
Received 0 Likes
on
0 Posts
You can do it.. How much u want to spend.. I turboed the 12a originally.. Elliot made me a custom manifold and sold me the turbo, mani , DP , WG , injectors , coils... Ecu, I pieced it all together to make my own kit..... Tons of time , effort, patients, help from others, and $$
02-24-14, 07:52 AM
#244
Junior Member
Join Date: Feb 2014
Location: ct
Posts: 23
Likes: 0
Received 0 Likes
on
0 Posts
i havnt really come up with a deffinet number that i want to stay within and i want to keep it 13b not a 12a i have heard those are a blast and cool sounding engines but i will probly keep it stock and get a second car thats already turbo or something unless i can do it simple and cheap the biggest thing is simple to me i dont want some complex setup that i cant even understand how it work or be able to work on it thats what i love about this thread he did all the work himself it all looks so clean and he knows how it all went togther incase something has to come back aparts but i hope my car doesnt need as much as this one but it may never be as nice either
03-04-14, 08:50 PM
#245
35r 13b first gen
Thread Starter
iTrader: (3)
Join Date: Apr 2002
Location: Richland Center WI
Posts: 1,290
Likes: 0
Received 0 Likes
on
0 Posts
It's in this lonnnnngg a$$ thread. Carbureted. It hauled at 8 psi while still trying to tune the damn carb w/ wideband and dual egt.. It was fun but my boost box sucked... Poor design and crap welds.. Then the second one was nice but the turbo was shot from first explosion... = second explosion... Will probably NEVER turbo a Carb again. Or buy anything from rotary shack for that matter...
03-04-14, 08:52 PM
#246
35r 13b first gen
Thread Starter
iTrader: (3)
Join Date: Apr 2002
Location: Richland Center WI
Posts: 1,290
Likes: 0
Received 0 Likes
on
0 Posts
I really hope u can have a turbo 1st gen someday... It's a blast when it's going... I just need a tube for this year... Saving up...
03-04-14, 09:23 PM
#247
It's in this lonnnnngg a$$ thread. Carbureted. It hauled at 8 psi while still trying to tune the damn carb w/ wideband and dual egt.. It was fun but my boost box sucked... Poor design and crap welds.. Then the second one was nice but the turbo was shot from first explosion... = second explosion... Will probably NEVER turbo a Carb again. Or buy anything from rotary shack for that matter...
The blowthrough was fun, but I agree, I'm all about the EFI these days, particularly if it were to come to turbo.
Did you consider boosting a Nikki?