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RX-7 3rd Gen Specific (1993-2002) RX-7 1993-2002 Discussion including performance modifications and Technical Support Sections.

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Old 03-22-2014, 01:10 AM   #1
speedjunkie
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Originally Posted by TitaniumTT View Post
Dual Bosch's huh? Did you get the optional muffler device?

LOL I didn't even think about if they were loud or not. I guess I don't need to change my exhaust to be quieter or reroute my dump tubes now lol. Honestly, I'd much rather have gone with smaller pumps too, but it seemed like the 044s were the most reliable out there right now. I was trying to wait for the new one Paul Yaw is working on with Bosch but I can't wait, I need to get this done. I'll switch to that pump down the road sometime.

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Originally Posted by TitaniumTT View Post
Ok Eric... here are my questions.... when you say bulkhead connector, are you referring to a connector that can be unplugged or are you referring to something that will allow the wires to pass through without breaking the connection? I know Charles uses a GM connector that he machines a lip into for the connector.

I would get in contact with Charles and see what those terminals are rated for and what wire gauge HE recommends. 10Ga is HUGE... most are rated for over 30A! You could run 1 pair of 10ga wires and power both your pumps.

However, if the connector is only designed to accept an 18 or 16ga wire (as mine is) than you have a problem. The solution is to double up on the wires, however I'm not sure if you're going to have enough pins in the socket. Lets say for example that your Bosch pump draws 14A at full song, which is does http://radiumauto.com/media/techarticle-page.php?Radium-s-Ultimate-Fuel-Pump-Test-87, also a nice little bit on the noise level and you have a pin designed for 18 ga wire. Well, that pin and wire combo can only handle about 11A. So, you need to pass 2 wire through for the 12v+ and 2 for the 12v- per pump. A total of 8 wires just to power the pumps. Then 2 more for the sender and the low level.... assuming you're still using them... But, that will give you more than enough current carrying capacity. I you're using a watertight bulkhead passthrough connector, they yeah, rock the 10 or 12 ga all the way through. Personally, I would use a 14ga, but that's me. 14ga is good to 17 or 18A. People start using ridiculously sized wire because they use cheap shit, don't know better, or just don't like working with the smaller wire. I was rewiring a bunch of shit last night to clean it up and I was getting annoyed with some of the 22ga wire in my harness. A lot of people use 14 wire to power their inejctors.... I use 20ga. This is all Tefzel though... ETFE I think... Which is what I would be running in the tank.
I wasn't talking about a bulkhead. I was just talking about the connector on the CJ Motorsports hanger.

OK I'll get ahold of Charles then. I never thought about asking him what they could handle. I thought about asking him what gauge he would suggest but I figured I'd check to see what others used first.

The CJM connector has six pins, so I was planning on using two for the sender and low level, and then the other four for the two pumps. I was planning on using something larger than 18ga if I can, I'll probably do 14ga, but I'll check with Charles first. I want to get really good wiring for the fuel pumps, I'm not playing around with something as important as that. Do you get the Tefzel/ETFE from ProWireUSA?

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Originally Posted by TitaniumTT View Post
The Bosch's have studs on them. So really any eyelet will work, just bolt them down using the supplies nuts. They are two different sizes though, just be aware...

If you need to make an electrical butt connection in the tank, you'll need some Viton heatshrink. Shit aint cheap, I can't remember where I bought it from.

All the wire and connectors can be had from ProWireUsa... talk to Joe, he'll get you all set up with everything you need.... he may even have the heatshrink, although I think I bought mine through MoTeC when I got my bulkhead connector.... Lemme see if I can dig up some pics of my fuel cell setup... they're on a different laptop, but they're also in one of my build threads... yeah... that's like 200 pages to go through... lemme see what I can find...
Yeah I already got the nuts for the studs on the pumps, they were not supplied with mine. I was just curious if there were solderless connectors out there that were good for submerging in fuel or if all solderless connectors were OK for that.

I can't think of why I'd need to make a butt connection in the tank, but maybe I'm misunderstanding what you're saying.

OK I'll talk to Joe. Once I figure out what gauge sizes I need I'll look him up. Thanks!

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Originally Posted by TitaniumTT View Post
If it we're me... I would skip the check valves and run two separate and independent lines, one feeding each of the rails, and then join them at the regulator. And I would use -6 if going that direction. If joining them, I would run a -8.
I'd rather just run them together instead of running separate lines for each rail, so I'll probably just get some 3/8" aluminum tubing and join them just outside the tank. I'm not looking forward to bending it like John did with his though lol. Maybe Ambrosio can come to CO and do mine too lol.

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Originally Posted by TitaniumTT View Post
I would talk to Charles to see what those pins are rated for.... you may be disappointed in what they can actually carry...
Yeah I'll do that.

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Originally Posted by TitaniumTT View Post
I believe the Bosch pumps do have a check valve... but I'm not sure if its a check valve that will hold the full pressure that the pump will put out. It may only hold like 10 or 15psi to keep a little fuel in the line to aid in start up.
I did some research and it seems the Bosch check valve is the part bolted into the outlet and you use a banjo fitting on it, but I'm not sure if that's the same thing I was thinking of. I was just concerned with hurting the fuel pumps if there was too much backpressure, but maybe I'm not understanding what the check valve is for lol. If it won't hurt the pumps, I will just put a 12mm to -6 fitting in there and take out what Bosch put in there.

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FWIW - I made 540 RWHP on an FD running 1 Stealth 340 and stock lines. Would I do it on my car? No... just saying...

I remember reading something about submersible line, but can't find it now.

To my knowledge, the only real submersible fuel line is the pushloc stuff offered by Aeromotive. It's the same material through the hose from the inside out. So if it's designed to handle fuel on the inside, it'll handle it on the outside as well. That's what I ran and 5 years later, it still looks great.

Now.... lemme go find some pics
I was looking at the Stealth 340s but it seemed like they weren't as reliable as the 044 after reading some reviews.

OK thanks, I'll check out the Aeromotive line.

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Originally Posted by FerociousP View Post
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1

I used this when adding my 09 pump into my rx8 (siphon extension).

the bad review is because he didn't know it was for only 1ft, lol.
Thanks! I'll check it out.

Yeah that'll do it lol.

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Originally Posted by TitaniumTT View Post
pics starting here

http://rotarycarclub.com/rotary_foru...=10116&page=28

Post 412 if you have different post/page view...
Wow. Yeah you always go way further than what I'm planning LOL. Thanks!
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Old 03-22-2014, 01:30 AM   #2
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Originally Posted by speedjunkie View Post
LOL I didn't even think about if they were loud or not. I guess I don't need to change my exhaust to be quieter or reroute my dump tubes now lol. Honestly, I'd much rather have gone with smaller pumps too, but it seemed like the 044s were the most reliable out there right now. I was trying to wait for the new one Paul Yaw is working on with Bosch but I can't wait, I need to get this done. I'll switch to that pump down the road sometime.
Oh really? Do you have a link to anything about what Paul is up to now?

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Originally Posted by speedjunkie View Post
I wasn't talking about a bulkhead. I was just talking about the connector on the CJ Motorsports hanger.
Ah, Ok... yeah... Yordan wired one of those in at the shop, I don't remember what size wire he ended up using.

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OK I'll get ahold of Charles then. I never thought about asking him what they could handle. I thought about asking him what gauge he would suggest but I figured I'd check to see what others used first.
It would nice if the pins could handle 14ga wire and north of 15A....

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Originally Posted by speedjunkie View Post
The CJM connector has six pins, so I was planning on using two for the sender and low level, and then the other four for the two pumps. I was planning on using something larger than 18ga if I can, I'll probably do 14ga, but I'll check with Charles first. I want to get really good wiring for the fuel pumps, I'm not playing around with something as important as that. Do you get the Tefzel/ETFE from ProWireUSA?
Yeah, I don't know what to do if the pins won't carry enough current. I suppose you could add another bulkhead connector.

Yes, I get the wire from Joe.

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Originally Posted by speedjunkie View Post
Yeah I already got the nuts for the studs on the pumps, they were not supplied with mine. I was just curious if there were solderless connectors out there that were good for submerging in fuel or if all solderless connectors were OK for that.
Any connector will work.... It's the heatshrink that is going to be a pain. Joe may have something that will work. I still have a foot or so of Viton heatshrink kicking around.

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Originally Posted by speedjunkie View Post
I'd rather just run them together instead of running separate lines for each rail, so I'll probably just get some 3/8" aluminum tubing and join them just outside the tank. I'm not looking forward to bending it like John did with his though lol. Maybe Ambrosio can come to CO and do mine too lol.
OMG... it is such a PITA, I've done it a few times now... it keeps getting easier but it is still such an aggravating adventure in testing patience.

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Originally Posted by speedjunkie View Post
I did some research and it seems the Bosch check valve is the part bolted into the outlet and you use a banjo fitting on it, but I'm not sure if that's the same thing I was thinking of. I was just concerned with hurting the fuel pumps if there was too much backpressure, but maybe I'm not understanding what the check valve is for lol. If it won't hurt the pumps, I will just put a 12mm to -6 fitting in there and take out what Bosch put in there.
Pretty sure that's exactly what I did when I ran the 044

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Originally Posted by speedjunkie View Post
I was looking at the Stealth 340s but it seemed like they weren't as reliable as the 044 after reading some reviews.

OK thanks, I'll check out the Aeromotive line.
I've been running it for a few years now with no problem... I've never heard of one failing but I'm sure they do.. We never had a problem with FuelLab pumps until we did... and tragic it was...

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Wow. Yeah you always go way further than what I'm planning LOL. Thanks!
Yeah... I tend to do that... my old tank was rusted from the inside.. I had that cleaned and epoxy coated... that lasted for like a decade until they upped the ethanol content and the epoxy started melting... that shit cost me an engine. Decided it was cheaper and better to build the surge tank rather than spend the money on a new/used tank...
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Old 03-22-2014, 07:04 PM   #3
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Oh really? Do you have a link to anything about what Paul is up to now?
I do not have a link, and so far I haven't found anything online. The only thing I've seen was on facebook, Aaron Parker pointed it out to me. I sent Paul a message about it a while back, asking him when he thought they might be available to the public, but I haven't heard anything back yet.

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Originally Posted by TitaniumTT View Post
Ah, Ok... yeah... Yordan wired one of those in at the shop, I don't remember what size wire he ended up using.
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Originally Posted by TitaniumTT View Post
It would nice if the pins could handle 14ga wire and north of 15A....
Well, I guess I'll probably use 14ga, or maybe 12ga even, but probably 14. As long as that is big enough, I don't see the need to go any larger.

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Originally Posted by TitaniumTT View Post
Yeah, I don't know what to do if the pins won't carry enough current. I suppose you could add another bulkhead connector.

Yes, I get the wire from Joe.
I thought about just doing one 044 and modifying the stock hanger with an aftermarket connector

http://www.racetronix.biz/itemdesc.a...WS-001&eq=&Tp=

but I was worried it might not seal, and I decided on two pumps anyway, so I went for the CJM hanger.

OK I'm going to email them or call and ask for Joe and get some 14ga submersible and 12ga or 10ga for the outside.

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Originally Posted by TitaniumTT View Post
Any connector will work.... It's the heatshrink that is going to be a pain. Joe may have something that will work. I still have a foot or so of Viton heatshrink kicking around.
What about the connectors that have heat shrink built onto it, that way you can shrink it on the end when you're finished? I figured the metal of the connector would be fine, I just wasn't sure about the plastic on the connectors, that's what I meant. Wanna sell that Viton heat shrink? lol

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Originally Posted by TitaniumTT View Post
OMG... it is such a PITA, I've done it a few times now... it keeps getting easier but it is still such an aggravating adventure in testing patience.
The things we do for our cars, right?

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Originally Posted by TitaniumTT View Post
Pretty sure that's exactly what I did when I ran the 044
Ok cool. As long as the pumps will be fine, I'll do it that way and skip an external check valve. I'm also thinking about getting an inline fuel filter with a reusable/cleanable element and ditching the stock filter.

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Originally Posted by TitaniumTT View Post
I've been running it for a few years now with no problem... I've never heard of one failing but I'm sure they do.. We never had a problem with FuelLab pumps until we did... and tragic it was...
OK maybe I'll ditch these Bosch's and get a couple Stealths haha. I know it's going to be a PITA to install the Bosch pumps with the surge tank, even moreso than it is installing them on their own, but I figured once it's in there I shouldn't have to worry about it for a while.

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Originally Posted by TitaniumTT View Post
Yeah... I tend to do that... my old tank was rusted from the inside.. I had that cleaned and epoxy coated... that lasted for like a decade until they upped the ethanol content and the epoxy started melting... that shit cost me an engine. Decided it was cheaper and better to build the surge tank rather than spend the money on a new/used tank...
Well that's a pretty good reason lol. I'd have done the same thing.
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