Poke Fun at Pirate87's Hoodrich RB build!

[pirate87]

Ok guys for the past 6 or so months I've been swapping a S1 RB25 into my 97 240sx auto. Zany in no way aptly describes the rollercoaster ride this swap has been, but currently its the only word I can think of to sum it all up. So, I thought I'd share some of my hood-lum engineering with the RB community, partially so you guys can point out my flaws and have a good laugh. The other reason is to help me fine tune the swap and bring out my RB's true potential.

Current Set-up

RB25DET mated to RB20 transmissionTop Hat MountsStock S14 DriveshaftTubular ManifoldMaster Power TO4E .50 trim compressor, .84 trim exhaustMcKinney Wiring harness (bought from another owner)FMIC 240sx MAF (owner I bought the harness from had it wired into the harness??)Z32 Six Puck Clutch on KA FlywheelTial W/G with 8 psi spring

Prelude to dissertation

I realize that immediatly there are several sore thumbs in this setup, but there's an excuse for each of them. Regardless the car runs and drives. Starting is no problem, the car idles smooth as eggs, the clutch engages nicely and off you go. Accelerating the car is as expected until the turbo spools around 4000 rpm, then power just seems to stay constant until about 5500 rpm when it starts to "bog" (i guess thats the right term). Its making nowhere near the power I'd expect from an RB, in fact it feels like a weak KA.

Problem 1- MAF

The previous owner of the wiring harness had a 240sx mass airflow sensor wired up and included it with the package. Never previously having seen an RB MAF I assumed thats what it was so I went with it. The car runs as mentioned earlier, but it seems that once the turbo spools it goes into safe mode, maxing out the MAF (around 4500-5500 rpm). Is this happening?

Problem 2- Z32 Clutch on a KA Flywheel

haha, lets all go ahead and take a moment to chuckle at this one. Anyway, my motor was originally from an automatic skyline (I didn't know this when I bought it), thus when it was shipped to me, there was no flywheel included (great!). So I searched for a flywheel, found one, and when it was shipped to me it turned out to be just another driveplate (even greater!). Desperate for another alternative I noticed the KA flywheel bolts right up to the crank. I bought a used one had it resurfaced and then brought it home to install. The Z32 clutch that I had bought earlier came close to fitting, so I shaved a bit off the bolt holes and made it work.

Now me and my overly hopeful nature believed from the begining that this would work fine. Driving the car, as most of you have been expecting, it feels as though the clutch is slipping thorugh about 3000rpms on. Is this happening?

Conclusion

These are the problems that I've been able to diagnose so far. Otherwise everything seems to be solid. Now I have a pretty good Idea of how to fix these, but I want your input (which is always appreciated) as creative solutions always seem to evade me (im good at the costly solutions though )

[Joe]

*shakes head*

anyway, first things first.

that MAF HAS TO GO IMMEDIATELY. you cant just slap a MAF on an engine and hope it works. nevermind the fact you are maxing it out its the fact the ecu is not set up to read air from that MAF! you are gonna need something like a Z32 MAF and fuel management if you ever want it to run right.

[Sil240]

Second thing is that you NEED to get a RB flywheel.That dangerous to have that clutch bolted to that flywheel with a bolt shaved off.Bro that thing will be spinning 8,000 RPM in there and will have no problem at that speed going through the bell housing.

I have a stock RB20/25 Flywheel if you are interested or I can maybe get you a Alumnium one.

If not I heard that the old Z31 or L28 flywheels work. (****Double check 1st****)

[email protected]

[pirate87]

Definately interested in the RB flywheel. Would a Z32 maf be my best option, or Q45, either way I need to change my fuel management so why not go with the Q45 maf?

[Joe]

Second thing is that you NEED to get a RB flywheel.That dangerous to have that clutch bolted to that flywheel with a bolt shaved off.Bro that thing will be spinning 8,000 RPM in there and will have no problem at that speed going through the bell housing.

I have a stock RB20/25 Flywheel if you are interested or I can maybe get you a Alumnium one.

If not I heard that the old Z31 or L28 flywheels work. (****Double check 1st****)

[email protected]

and if it goes through the bell housing it will have NO problem tearing through your floor and legs.

ive seen some serious damage from an exploded clutch/flywheel. its not a game.

[pirate87]

with the clutch flywheel combo, its not that there are bolts missing, its that the clutch isn't balanced perfectly on the flywheel. The bolt holes are very similar, but dont quite line up, I shaved the clutch plate bolt holes a bit so it lined up better. There's no rattle or unusual vibration, and if for some reason it did shear the six grade 10.9 bolts, it would still have to rip through the transmission shaft, bellhousing, and then floor to pose a threat to me.

not that I am arguing your point, just dont want you guys to worry tooo much about me!
Modified by pirate87 at 1:01 PM 3/12/2007

[Suicide.Veteran]

weak ka huh? LOL.....not even gonna go there

[Carl H]

ditch the maf its already maxed at 5k.that and you need management for that larger turbo, you are asking for trouble.

[pirate87]

weak ka huh? LOL.....not even gonna go there

Pardon me, a weak D15, haha, slip of the tounge.....I forget the wonderful Nissan company I keep!

Ok, so here's the plan:

Q45 Maf, Power FC (if I can get my hands on one... sellers??!), and round it all off with a new Clutch/Flywheel combo

after all that is done, i'll see how she runs and asses further problems from there. Should I be worried about new injectors yet, I dont want to push more than 300 horses currently?

[rotorimp]

I would definitely get the basics up to par--BEFORE--upping the power. get a real rb25 trans,flywheel and clutch. Get the proper maf and drive the car for a while to get the rest of the bugs that will appear worked out. You can't just slap a slice of bread on a weenier and call it a hot dog. I'll all for cheap build-ups and getting things to work --but spend the money your saving for the FMS and buy the right parts.

[pirate87]

get a real rb25 trans

Easier said than done my friend

[s14kouki]

not really hard, just expensive

[pirate87]

anyone ever heard of "GTS Link" seems like a viable option since Power FC's are fetching about 1500 Aud these days:

http://www.slidingperformance....d=331

[rotorimp]

I have been looking at this FMS and a few others and It may be the one I go with! Nice Find. I would take it over the P FC.

http://www.linkecu.com/product...2-r33
Modified by rotorimp at 7:34 PM 3/12/2007

[Darius]

Do my eyes deceive me or did that say $1600US for a complete system with display? I could get two PFCs for that much and almost put a boost control kit on one.

[pirate87]

Do my eyes deceive me or did that say $1600US for a complete system with display? I could get two PFCs for that much and almost put a boost control kit on one.

Bahaha, you show me a power fc for anywhere near $800 and I'll believe that!

[rotorimp]

After you FIND a PFC and buy a datalogit your well over a grand. Is the PFC going to be replaced?????? should I wait to see what they come out with? If you buy what you need and you have a lap top then you around a grand.

[Spazz]

Do my eyes deceive me or did that say $1600US for a complete system with display? I could get two PFCs for that much and almost put a boost control kit on one.

i was quoted 1159 shipped directly from electromotive , for a link g3 and ats sensorunlike the pfc , their software is free to download and it comes with a link cable for laptop hookup, 3 bar map sensor.

[NightKids2]

I used to have a link to a place that did sold em dirt cheap. I believe it was JapPartsSpecialst, but not their ebay store.

Although you are correct, they dont make them any more. I havent looked recently but the price could be going up.

[HxC_Nismo]

Easier said than done my friend

usaully they have them in stock and they come with a flywheel,shifter and starter for $1200 plus shippingjdm engine corphttp://www.jdmenginescorp.comcall (972)234-2500

this is where i got mine and there out of texas so you dont have to take your chances with the canadians running away with your money order.you just have to look there are more elsewhere if you just look and call them personally and not look only on there internet catalog.

also i believe that mckinney motorsports has one 951-304-9300

[HxC_Nismo]

oh i just found rb25det trans on ebay w/o flywheel or starter thoughhttp://cgi.ebay.com/ebaymotors...QrdZ1

[Sky80]

If you check out the link in my sig, i have my emanage ultimate for sale that will plug and play with your rb20, and also comes with everything to change it to MAP, check it out! Also i think you were the one that already talked to me about buying my flywheel, let me know man

[pirate87]

I appreciate the offers, but I have an RB25 and I almost forgot about the flywheel, I'll get back to you soon!

And wow! somone get on that transmission....great deal.
Modified by pirate87 at 3:06 PM 3/17/2007

[Sil240]

Hey,That Master Power TurboI've just stumbled upon them.

They actually have a website, make stuff for diesels, and googled and haven't heard any horror stories.

How is that turbo??My Rb25 turbo blew so I'm looking for somthing cheaper than 500.

[StricNyne]

master power is brazil company i MET a guy with a foxbody mustang with a rb25 using a master power t88 (i wish i took pics) and he said it was amazing just spooled slow (DUH) i was gunna run a MP 62-1 but sold it for the twins !!

[pirate87]

I haven't had it on long, but from what I've heard they are decent turbos. I also understand that they are the turbos used in "Rev-Hard's" kits.

master power is brazil company i MET a guy with a foxbody mustang with a rb25 using a master power t88 (i wish i took pics) and he said it was amazing just spooled slow (DUH) i was gunna run a MP 62-1 but sold it for the twins !!

was that the JGY RB25 mustang?