cams and transmission question

[kbflip02]

ok so ive decided to bypass the knock sensor until i can find the time to replace it entirely...now when i decide to pull the intake off i figure while im in there i might as well change out the cams and injectors....im going to go with jim wolf cams and the stock injectors from a twin turbo(i think 370cc)any thoughts on this???

also i was told that the transmission from a QX4 will fit the J30...anyone ever heard of that???

now i know when i do the cams ill probably need new cam gears and valve springs...however does this seem like a worthwhile investment or just another waste of time...

PS im looking for a stock ECU from another 94 J30 so i can get it reflashed that way i have an extra one in case the reflashed one has problems...should i buy a new one or go with used...

oh and lastly what would yall do for brake upgrades on the J...

-K

[driverdriver]

The QX4 transmission won't fit the J30.

Brembo rotors are a nice brake upgrade, you can feel the difference. Nobody makes custom calipers for the J though.

[kbflip02]

The QX4 transmission won't fit the J30.

Brembo rotors are a nice brake upgrade, you can feel the difference. Nobody makes custom calipers for the J though.

looks like ill be making a call to level ten for the transmission then...thanx driver....im going to look into those rotors and i guess ill just get new stock calipers

if u can think of anything else i do while ive got the intake off let me know...im all ears...

[Midwest_Drift_Shop]

There isn't much you can do with the J's transmission, and the RE4R01A isn't a great transmission to start with, about all you could do is take it to a professional transmission builder that has alot of experience rebuilding R4L60E's and other performance automatics. They should be able to build an RE4R01A to handle better power, and possibly a shift kit for improved shift times.

Go with Brembo rotors and possibly Z32/GT-R calipers(if your wheels will clear them), and go with Hawk pads. The Z32 calipers should be able to fit on the J, I don't know if anyone has done that before.

If the car is your daily driver, i wouldn't go with performance cams, it would just be a waste of time and money. If you were to go that far, might as well build the bottom end while your at it. Some forged aluminum pistons and stronger rods would be nice, plus if you go with lighter pistons, it will remove a little rotational weight, might gain 2 or 3 hp from that alone. Although the stock internals would probably handle the performance increase from the cams, injectors and tunes. It wouldn't be a much larger number than from stock, if you want some nice HP numbers, forced induction would be the way to go.

[kbflip02]

There isn't much you can do with the J's transmission, and the RE4R01A isn't a great transmission to start with, about all you could do is take it to a professional transmission builder that has alot of experience rebuilding R4L60E's and other performance automatics. They should be able to build an RE4R01A to handle better power, and possibly a shift kit for improved shift times.

Go with Brembo rotors and possibly Z32/GT-R calipers(if your wheels will clear them), and go with Hawk pads. The Z32 calipers should be able to fit on the J, I don't know if anyone has done that before.

If the car is your daily driver, i wouldn't go with performance cams, it would just be a waste of time and money. If you were to go that far, might as well build the bottom end while your at it. Some forged aluminum pistons and stronger rods would be nice, plus if you go with lighter pistons, it will remove a little rotational weight, might gain 2 or 3 hp from that alone. Although the stock internals would probably handle the performance increase from the cams, injectors and tunes. It wouldn't be a much larger number than from stock, if you want some nice HP numbers, forced induction would be the way to go.

yeah i just have to figure out how to do the twin turbo swap...theres a lot of relocation needed to be done there...

[Q45tech]

The problem with larger injectors is getting the idle flow correct.

370/290cc= 1.275862 take sqrt 1.12954 or 13%Find a 300zxtt ecu as that would function [idle/cruise] correctly with the 370cc units.

The Q45 used the 370cc to match the 12.57% larger cylinder displacement 499cc vs 561.75 cc

Even the 370cc in 90-96 Q45 doesn't exceed 65% duty cycle, unlikely that a NA J30 would need more fuel than a 290cc could easily supply.......enough for 275 HP @ 85% duty cycle.

Hopefully you see that stock injectors peak at 65% duty cycle in J30 design.

Note the same logic between these 2 designs [J30/300 and Q45]

[Midwest_Drift_Shop]

Rear Mount Turbo... Look at the Q45's, there are a few that have that setup. The stock muffler on the J is large enough to get rid of and place a nice turbo setup there.

Just an Idea.

[kbflip02]

Rear Mount Turbo... Look at the Q45's, there are a few that have that setup. The stock muffler on the J is large enough to get rid of and place a nice turbo setup there.

Just an Idea.

i dont quite follow...rear mount turbo...please explain

and wouldnt i need those bigger injectors since im running upgraded cams?

[yodawill2000]

long thread but well worth the read ..zerothread/281662

[brandonjustice93J30]

Being curious and looking for a new engine for my Spyder. I've seen a lot of used T25's and such from Eclipses complete with factory SMIC's for under $250...I've always pondered buying one and adding it to my J, just have been curious to what fuel and ecu changes I'd need to do as well.

might be a project after I get the wife a new car and we have two again.

[gr8scott72]

i dont quite follow...rear mount turbo...please explain

and wouldnt i need those bigger injectors since im running upgraded cams?

He's saying that even with bigger cams, you will still not be running out of fuel with the stock injectors since they do not run even close to 100% duty cycle with a stock engine. You will probably not be maxing out the stock injectors with the upgraded cams.

That still seems like a LOT of work (or money to have someone else do it) for not much return.

[Midwest_Drift_Shop]

Well, depending on how much boost you want to run, you will probably have to upgrade the pistons to a lower compression ratio, since the VG30DE runs at a decently high compression ratio, probably too high for a turbo setup. I think 6 psi would be the limit on stock VG30DE. Now if you want to swap in a VG30DETT you wont have any problems with the compression. If you want to use the stock VG30DE, you can probably add Water/Methanol Injection to help cut down on detonation, cause heat is a problem when running a turbo on high compression engine.

If it's possible, you could use a Z32-TT ECU and injectors and you'd probably be running good from 8 - 10 PSI, If that won't work, you can chip the ECU and use a nice Z32 TT tune, the stock Z32 TT injectors would probably be enough.

From what i've seen on some rear-mount turbo setups, you don't even need an intercooler in some cases (the piping is so long the, it almost cools down the air), if you want to run more than 10 PSI it wouldn't hurt to use a small intercooler, like a DSM SMIC. I use an R32 GT-R SMIC on my 85 Turbo Maxima, and it works really well at 12 PSI, with Water Injection.

[Q45tech]

Still down understand what you think you will acomplish by replacing the 4 cams? If you super/turbo the oem stock cams are fine and more duration/overlap may hurt power or at least reduce gains on a per psi basis.

[gr8scott72]

Still down understand what you think you will acomplish by replacing the 4 cams? If you super/turbo the oem stock cams are fine and more duration/overlap may hurt power or at least reduce gains on a per psi basis.

He wants to add power to his N/A car. He doesn't want to turbo it. I agree though, gains would be minimum compaired to cost/labor to install cams.

[kbflip02]

this is correct thank you scott...so what in your opinion do you reccomend....i figure if i do the cams ill have the intake ported and also upgrade the throttle bodies and injectors...what do you think...

[gr8scott72]

this is correct thank you scott...so what in your opinion do you reccomend....i figure if i do the cams ill have the intake ported and also upgrade the throttle bodies and injectors...what do you think...

I've already told you my opinion.

That is too much work/money on an almost 15 year old car that will yield very small returns in power.

Are you doing the work yourself? From the way you are talking, I don't think you will be and if you have someone else do the work you are talking some major coin for those upgrades.

[Q45tech]

Look to various specialized NA 90-96 300zx Forums since engines/AT transmission are identical, obviously all these things [everything possible] have been done numerous times previously on that vehicle.

[brandonjustice93J30]

I looked a few years back when my Mom first bought the J, after I found out it had the VG30DE and it was equlivent to the 300Z, at Stillen when I was buying parts for my Spyder. Even with every available N/A part, short of Nitrous. It was only going to yield 300-310 hp (a 90-100 gain), with a $7000+ part cost, adding up the HP gains listed in the catalog for each item.

generic parts would be less...but still not much gain for the cost IMO. Best bang for the buck if you want lots of power with the J is doing the TT swap...would end up costing about the same but with a better base point to add further upgrades.

[Q45tech]

Based on 18 years of experience Nissan power increases usually cost $100 per Horsepower and $120 per lb/ft of torque up to limits of 78 lb/ft per liter.

How many thousand do you want to spend.

Around $4,000 [40 HP} it is easiler to super/turbo charge.

The most bang for the buck is a reprogram of ecu to remove some of factory builtin SAFETY RESERVE............you can get 15-22 HP, then comes teeth shattering exhaust.

Cams take so much time to install especially with engine in vehicle.

[brandonjustice93J30]

That was about 10 years ago too...and the "listed" hp gains are never usually close to what you actually get, so I'll agree with you on those prices.

And just like you said $4000 for 40 hp...just as expensive to swap

AND...anything being modded to that point will drop sharply in MPG, or at least I'd think so....if anyone complains now about what the J gets, they definately wouldnt want it after being modified.

[kbflip02]

ok well i have to take the upper and lower intake off anyways to get to the knock sensor...so i figured why not do them while im in there...im also going to have the intake ported while its off and upgrade the throttle bodies...you dont think all that with bigger injectors and the jim wolf ECU tune would be worth it???

[naladude911]

LOLOLOLOLOLOLOLOLOLOLOLI told him the transmission from a Qx4 would fit lol.