Tman7878's Rb26dett 240sx

[bobbo]

Very cool build! Big props to all of your hard work. Your power numbers do seem a little low. Going to 14 lbs would certainly be safe. Are they steel wheel turbos? I'm lovin all the braided line work.
So I guess you're gonna keep the green huh?

[tman7878]

Getting a Happy Ending

So after the first dyno appointment my tuner and I had a long discussion about where the car was now and where I wanted it to be. Seeing as we were limited by exhaust air flow and head flow really our only options short of building the head was to throw in a set of splitfire coil packs, a proper boost solenoid wired to the ecu, and turn up the boost. Now I'm not to worried about longevity because I'll be slowly working on building a new engine while I enjoy this one.

Anyways back to the story. After everything was installed it was time to hit the dyno again. After getting all set up we were ready for a few high boost passes.

Here was our starting point at 13.5 PSI



After a couple hours of tweaking and pushing we ended up at 17.5 PSI. We were starting to see bigger gains as we were now getting into the efficiency range of the turbos. Without any head work and the exhaust flow restrictions I found the -5's to be a bit oversized for my application. However they are going to be perfect once we get a build head on the engine. Nonetheless, here are the final numbers we ended up with. (Please ignore the 20PSI on the screen, the gauge is not properly calibrated)

http://s447.photobucket.com/user/tman7878/media/240sx/IMG_3415_zpse3244666.mp4.html

353 HP & 314 lbft TQ @17.5 PSI

After all was said and done we dialed it down to 16.5 PSI for that extra degree of safety leaving the car at 340HP and 300 TQ. Overall I'm pretty happy with the result and would like to thank the guys at Lightspeed Innovations, especially Cam.

On another note, Santa was very kind this year!





Thanks Daryl for hooking me up with these! RightDrive was very prompt in getting these to me.

Now here is the plan for what needs to be done next before it is ready to go for an inspection and get registered/insured.

To Do List:
1. Fix horns (wiring issue)
2. Wire in EDFC
3. Wire in Turbo Timer
4. Install Oil Pressure Gauge Sensor
5. Fix E-Brake (The torsion springs on the rear brake callipers are seized I believe)
6. Get basic 6-point Roll Cage installed
7. Install racing seats
8. Install Takata Harnesses
9. Build mounting bracket for battery
10. Build small mount for coolant return line (the coolant return line falls dangerously close to the exhaust manifolds)
11. Install water temp sensor
12. Re-tap shift knob (shift knob not proper size from sr20 transmission)
13. Install hood/aero
14. Get Alignment



Overall this is about all its going to take to get the car ready for some daily driving and fun!

Thats all for now, thanks for reading. More updates to come soon. Stay Tuned!

[tman7878]

Very cool build! Big props to all of your hard work. Your power numbers do seem a little low. Going to 14 lbs would certainly be safe. Are they steel wheel turbos? I'm lovin all the braided line work.
So I guess you're gonna keep the green huh?

Thanks man! Yeah they are steel wheel turbos (Garrett GT2860r-5's). Haha read the latest update...we went a little past 14lbs. Actually I decided it wasn't worth it until I was tearing apart the head so for now it will stay green, yes.

[charlie99]

Thats not a bad idea, only downfall would be the sharp 90 s turn it throws the in the downpipe so I'm not entirely sure that would be too much better. I'll have to ask my flow dynamics prof about that. Do you have any pics of what you've done?

The big big diiference would be having a full diameter exhaust rather than that flat spot not sure what kind if diameter is left with that fish belly.

[tman7878]

The big big diiference would be having a full diameter exhaust rather than that flat spot not sure what kind if diameter is left with that fish belly.

Well essentially you're doing the same thing by bending the tubing because there will be stagnant flow areas on the outside of the bend an immediately following the bend essentially reducing the diameter of the pipe. (Found this diagram helpful in understanding)


Comparing the two get a little tricky in terms of back pressure though because back pressure due to diameter restriction is based on fluid viscosity and back pressure due to bent piping is based on density. Or at least thats how I understand it. Either way you end up with back pressure you'd rather not have.

In the interests of this build I don't think its worth change at this point in time. I think I'd see much more benefit from some head work and if it truly is the restricting factor I'll have to go big single.

[gtrjon]

would you care to post up a detailed list of all of the fittings sizes and hose lengths you used for your turbo oil and coolant lines?

[charlie99]

What diameter is the mckinney downpipe.

[tman7878]

would you care to post up a detailed list of all of the fittings sizes and hose lengths you used for your turbo oil and coolant lines?

I ordered the turbo oil restrictors, and oil block adapter from rawbrokerage.com

I used the existing oil drains

And I used 1/4 npt fittings on the coolant lines. I think those were wrong because the fit wasn't perfect and the fittings shouldn't be tapered like an npt. That being said I'm sure using some Teflon paste you would be able to get a thread seal. I however improperly installed the fittings and had a leak so when the car was at lightspeed I had them fix the leak, not sure if they changed the fittings or just added proper sealant. I can ask if you'd like.

As far as taping back into the coolant lines I just cut the hard line on the return at the back of the engine,
Flared it and used a hose clamp.

Then I just used a hose
Clamp on the front under he Cas unit.

Let me know if I forgot anything.


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[tman7878]

What diameter is the mckinney downpipe.

I'd say it's reduces to about 2/3 of the original 3" pipe. So it's probably like a 2" restrictor.

It's also probably creating some turbulent air flow because I don't think the actually transition is smooth as the piece was just welded in.


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[charlie99]

Any updates. I got my swap up and running.

[tman7878]

Tman7878's Rb26dett 240sx

It has been a long time since I've updated this thread, sadly I'm out of Canada for the summer so the build is on hold. The car is missing a handful of things and should be on the street by the end of August.

Here is a teaser! More to come!



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[MikeyRHD]

Hey what cams are you using? Just curious because I'm getting 450+ whp at 15psi with tomei m7655 turbos(should be somewhat similar to -5s), poncam b, tomei dumps, stock manifolds gasket matched on the turbo side, but completely stock head/motor. I don't have the exhaust restriction you do though.

[tman7878]

Hey what cams are you using? Just curious because I'm getting 450+ whp at 15psi with tomei m7655 turbos(should be somewhat similar to -5s), poncam b, tomei dumps, stock manifolds gasket matched on the turbo side, but completely stock head/motor. I don't have the exhaust restriction you do though.

Yeah the cams are the issue. They're stock cams.

A built head is in this off seasons plan!

Pretty sure cams, port/polish, and retune would translate to a 75-100hp gain.

Thanks for the input!


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