240Z Sr20DET swap questions

[Verb240Z]

I am currently upgrading my 1973 240Z with a SR20DET. I was wondering what people, who have done the swap, have done to compensate for the fuel delivery. Is it possible to upgrade just the fuel pump, and if so with what? or do you upgrade the fuel cell and add an external fuel pump? help please....

[RBZ 260]

u can upgrade just the pump with external electric fuel pump either bosch 440 or on the cheaper side VL turbo pump. only prob is u got to make sure u got at least more than 1/4 fuel in the tank otherwise it will starve both pump and engine.

 

before u know it u be out buying new pump.

 

ive used holey red (cheapest out of the better brands high flow low pressure feeding a surge tank than from tank u have ur 0440 or VL.

 

i had in mine holey red feeding a 2.5l surge tank with internal Walbro GS332 from memory 255LH fuel pump for S15. worked a treat.

 

other than that ii think earlier 240z had smaller fuel delivery lines than the later 260z. if so u may need to upgrade to larger diameter lines like the ones in later 260z.

 

have u dont hte conversion ie is the engine allready bolted to the car or u asking what involved with that too?

 

[NZeder]

Road or Track car? If road why go to a fuel cell? Just have a good surge tank, a lift pump and then a good fuel pump up the engine bay - all external to the tank. Or you could modify the tank just be aware that once you cut open a used fuel tank it will rust up fast if left empty after welding - keep it wet with fuel and you are good (that is what I have been told not had first hand experience on welded fuel tanks before)

[Verb240Z]

RBZ 260:

 

thanks for the heads up. I am currently looking at a 16gal fuel cell with a 0-90ohm sending unit. And you are right on the fuel pump, I looked around and everyone has been using the 255LPH fuel pump. As for the fuel lines, I do have to upgrade them, going to buy stainless steel lines. I think that would be the best route. I am going to use the McKinney SR20DET S30 conversion mounts to drop the SR20DET motor in, was just curious on the fuel delivery. Thanks!

[Zedman240®]

The fuel line to the engine is from memory ok, just the fuel return has to be upgraded. I ran a Rb25 with a 260Z return line and that was fine.

[Verb240Z]

Zedman240;

 

What did you do for the fuel pump?

[Verb240Z]

Question:

 

Is the Walbro 255LPH internal pump install pretty simple?? into the stock 1973 fuel tank?

[RBZ 260]

nope u got to cut the tank.

also there arent any baffles inside the tank so u will have issues when flooring it or going around corners with less than 1/4 tank.

 

my next project im planing to use a modified S13 or 180sx fuel tank. its similar style to s30 its metal and it has internal fuel pump which includes baffles.

 

ive installed the walbro into custom surge tank bit of a pain in the A$$ to make up and seal properly but can be done.

 

 

[Zedman240®]

Zedman240;

 

What did you do for the fuel pump?

I ran a small "Facet" pump to the surge tank then just used  a standard VL EFI pump. Cheap and plentiful and easy to mount externaly. Unless you are running massive 550cc+ injectors, mine were approx 250cc and worked very well with duty cycle never going above 70%.

[Verb240Z]

Rb260 or Zedman240:

 

I am looking at the Bosch 440 inline fuel pump as RB260 stated earlier in the thread. For this style fuel pump, can I just install this pump externally onto the delivery line? And would that do the trick? As well as change the diameter of both th delivery and return line?

[herrods]

hey Johnny, the fuel systewm you were running/i am notw running, will that work right to the bottom of the tank, or do i also have to keep my tank above 1/4 full?

 

dave

[RBZ 260]

verb240 yeah u can if its the external type and adapt to the existing lines. but again u got to make sure it doesnt run out of fuel otherwise it dies. than $300+ later for new pump.

 

 

Dave, as long as u dont run it very low it wont have any issues. i had mine dead on "E" once just to try it out and never missed. but ive learned to make sure my cars got at least 1/4. replaced quite a few pumps in my S14.

 

previously had holey blue reconditioned one and vl turbo inline no surge tank. if less than 1/4 she started missing. shortly after the VL one died.

 

than i returned back to my surge tank and walbro but had issues with fuel leaks on the surge tank. redesigned the top sealing cap using an O ring never leaked after that till it got written off. so u shouldnt have any issues with it Dave.

 

 

[Zedman240®]

If you know someone who can weld up some alloy, a surge tank can be made real quick and easy, or you can buy one for about $100. Theres a bit of room behind the diff/in front of the tank for all that to fit snugly. It's a PITA to plumb up but once it's done, it does the job! If you need a pic, I can take one for you..

[sco_aus]

I have my surge tank mounted in front of the tank on the right hand side.  There is a nice open area there with some brackets already in place on the front of the tank.  Then at the top you can mount it to the chassis:

http://i173.photobucket.com/albums/w45/sco_aus/DSC00703.jpg

http://i173.photobucket.com/albums/w45/sco_aus/DSC00702.jpg

 

They may shed some light.  BTW its for RB25DET setup.

[Verb240Z]

Thanks for all the help with the fuel delivery guys! Very appreciated! So now for my next question, what size intercooler did everone use the mounts nicely (given some fabrication will happen) for a front mount? Not sure what size. And what brand did everyone use?

[sco_aus]

A good quality core is more important than a massive intercooler. But just as important, is damming air to actually go through the intercooler.  Air, like water, will follow the path of least resistance, so make sure its got good shrouding etc or it will just go around it. 

 

Its not too hard to mount one, but make sure there is some sort of rubber or material between the two metals or it wont last long.

 

http://i173.photobucket.com/albums/w45/sco_aus/DSCF0006-1.jpg

Top radiator support mounts for the intercooler before shrouding.

[Verb240Z]

Correct about buying a quality intercooler and not getting a cheap one but my question is, with so many different types and sizes and inlet and outlets, which one did you (people have done this type of swap) use? Like was an intercooler design for an rx-7, or was it a civic? Which style inlet and outlet gives you the best access when running the piping?

[RBZ 260]

i used a generic one that i bought of ebay. it was well put together. my guess its it bit of luck buying those chinese intercoolers. bought two so far and seemed to be ok. not that bad quality. but seen some dodgey ones too.

 

i used the universal 600x300x76 which is same what they use in nissan kits ie S13, s14,s15,R32 and R33. though piping be useless need custom job.

 

if u check my gallery u see how i installed it.  didnt use diffusers as air could only go one way and couldnt have gone around the intercooler. ive positioned my connecting hoses at the bottom and modified the front rad support.

 

on driver side i used the existing air vent pick up and on passenger side made an extra hole for pipes to go through. the left air vent i used to mount the AFM and filter which was position just infront of the grill next to the intercooler. nice and cold fresh air.

 

having the pickups lower requires more moding on the skirting.

 

idealy i would like to have inlet on higher and outlet on lower side of the cooler to use it more efficiently. next project Z i will try do something like it. intercooler size ill be looking at will around 550 or 500x300x100 or 120 thick.

 

though ill be using different engine with larger turbo.

 

i found in my s14 (sr20det ) that had a smaller trust cooler was lot more user friendly than the replacemt 600x300x76. it had quite a bit more lag even with crossflow design. the old trust one i had had like 2m of piping.but lag was no different to the stock one. 

smaller cooler less lag but it will get hot after few squirts.

with the bigger one i haven't noticed much loss in performance when used a fair bit. but the lag is quite noticable. thats for a street daily use.

 

[sco_aus]

Well yeah, thats the idea of having the better quality core, they flow much better.  The thing with shrouding is that the air will exit the side of the vehicle and not even pass through the intercooler.  Obviously it is or your radiator wouldn't work, but you get the idea.

[NZeder]

If you want to see a good SR20DET conversion check out ClassicZcar forum. Look for a thread under Car Forums titled "24 Months of Intensive Restoration"