let's get started
 

hi guys

it's been a while from my last post .

I'm opining this new thread to discuss with you my new rebuilt of my turbo
VQ30de project .

from the old thread we discussed the problems that I have found in my old engine .
1- blown head gaskits
2- dameged sleeves
3- 2 dameged pistons
4- cracked block
5- Scratched cranck shaft bearings * canck shaft not dameged but sent for balancing .

and also we discussed the thing that did this problems which is

miss shift from 3rd gear to 2nd gear with turbo boosting 10 psi and over rev-up above 8700 RPMs that was shown in my boost cotrol screen.




now I want to discuss with you what are the things I must do to prevent my new engine from any mistake wich could happen next time.

here are the parts list .
1- JWT cams
2- 4 good CP pistons from the old engine with 2 new pistons .
3- new comtec head gaskits .
4- ARP heads stud bolts.
5- renewed and machined block on the pistons size .
6- Z350 oil pump
7- VQ35DE-HR valve springs
8- VQ30DE gaskits sit


what is in my mind is to prevent over reving and prevent miss shifting .


are my parts good enough ?
is there any thing that can help ?

I don't think any of that will prevent mis-shifts. The only things I could think of would be to practice driving or an automatic transmission but I doubt you want to hear that.

There is no upgrade that will keep you from hurting a motor like that. If you by mistake shift from 4k to 3k in full boost at 6k rpm, dosnt matter if you have a rev limiter or anything, its mechanically going to overrev and break something, unless you have the valvetrain to rev HIGH like 9k. Best thing is to shift slower and make sure of every shift you make is accurate.

What shifter are you running? oem or a short throw?

If you have a short throw, throw it in the trash where it belongs. Nothing beats a stock shifter, except a stock shifter with Lario bushing. I've sold every performance part I've ever had, I even sold all my vlsd trans', but my Lario bushing is the one thing I will never get rid of, and a sts is the one thing I will never buy again.

I dont like the autimatic transmission . I will practice shifting .

hmmm . you are right . but I heard that some ECUs like greddy and AEM have something like a safety plan or somthing like that . if any mistake hapened it will switch to that whatever safety plan . but Iam not convinced .

OEM but the spaces between the shifts are so long and some times the nob does not get in but some times I feel it like in neutral when it's in

one of my frinds has a short throw shifter . I will try it

Your shifter bushing might be old an worn out. Ever since I got a "newer" one from the junkyard, my shifts have improved 100%. New bushing + stock shifter gives me nice shifts. It gets into gear everytime and I can feel everygear just fine.

Other cars (such as hondas) usually benefit from short throw shifters, but on our maximas, i've found that STS makes our shifts worse.

did you try to drive a 6spd V6 altima ? I did and I like how it shifts .

I did drive Z350 also and I love how it shifts.

i want my max shfting like them .

I've driven those cars. It's highly unlikely that we will ever get our cars to shift like those. Our 5 speed uses a completely different shifter assembly than that of the 6 speed altima. The most we can hope to do is stiffen up the bushings, mounts, etc. to reduce the sloppiness as much as possible. And trust me, with all new/improved parts, the sloppiness can be virtually eliminated.

ok then . new transmission bushings .

someone told me that there is some kind of locks that can hold the shifter nob and never release it without pushing the cluch pedle and never shift down in high RPMs . but I dont know if that's true or not .

it's not possible. it doesn't matter what ECU you have. the speed of the wheels when you shift (and your reaction time to missing the shift) is what determines how high your RPMs will go.

electronics have nothing to do with it. it's a mechanical link between the wheels and the engine.

He might be reffering to a feature that cuts fuel/ignition. Similar to our stock rev limiter in the instance of, say... a boost spike. Or the user not paying attention to the tach and shifting too late with a car that has no rev limiter what so ever. (I dont know why that would be the scenario, but just throwing it out there)

Either way, this will not prevent over reving because of a mis shift. Think of it like this. Say your holding on to a car while riding a bicycle to gain some speed.(this is what we do in jamaica so dont hate :p) If something gets jammed in a spoke and stops the wheel, as long as your holding on to that car, your gonna keep moving forward. (with or without the bike :laugh:)

uoooh damn . in the end it depends on the f**king driver . ME


I tried a shifter today . it's realy harder than the stock one but to me I think it will reduce miss shifting but I might shift littel too late . i might be late for 80/100 parts of a second from 2nd to 3rd gear .

but Iam still thinking about the bushings . I still dont know what to do about it . get shifter or get new bushings ?


what are the advantages / disavantages of the shifter ?

guys my macheainst will take the block with the crank shaft to the machine shop . he told me for free up but I dont know what kind of free up he means .

he sayd that the cranck shaft is hard to rotate after tightinig the bearings .

but I am sure of the size of the bearing .

please guys say somthing .........

Check in the all motor section or p.m someone knowledgeable there.

If the crank is hard to rotate after tightening the girdle, then the bearings are too thick. There are many bearings to pick from, even from factory. you have to read the FSM carefully, it tells you everything in much detail.

thank you . the problem has solved .

but now a new problem apeared . becouse of the corrosivness of the mixed oil and water , I got the valves corroded and eated where they set on the heads . I need to replace them .

BTW I couldn't find new valve springs and my macheainst sayed that they are good . should I cary on with them ?

got brand new valves and waiting to saturday to have them adjusted whith the heads .

90% finished . need to get it in the car to start it up .

what's wrong guys ? am I speak to the wrong ppl ?

i need visuals lol

then watch this !!!

this video dedicated to maxima.org

this video shows the progress of maxam's (me) turbo maxima project .
Location: Saudi Arabia - Eastern Region - Saihat City
Al-Darweesh Workshop .
injoy watching ^_^



http://www.youtube.com/watch?v=_klElyJGBIo

please leave a comment .....

Very nice, what intake manifold are you going to use?

our intake manifold of course ^_* MEVI wich our maxs came with . I dont have to buy it

I can modify it . porting and polishing

some pic's

old oil pump and rev up oil pump

http://www.mediafire.com/imgbnc.php/...141c5b372g.jpg


6 CP Pistons before rebulding the old engine

http://www.mediafire.com/imgbnc.php/...5568c2c22g.jpg


the block with 4 old pistons and 2 new


http://www.mediafire.com/imgbnc.php/...cb02c0792g.jpg


http://www.mediafire.com/imgbnc.php/...2ba160f82g.jpg

JWT cams

http://www.mediafire.com/imgbnc.php/...00aa52852g.jpg

http://www.mediafire.com/imgbnc.php/...0cec06a32g.jpg

http://www.mediafire.com/imgbnc.php/...74533b5a2g.jpg

Wow talk about Arab money!!

Build looks good though. Hopefully when it's done you learn how to drive properly so you don't blow the motor up again.

more power = more money ^_^


a pic of the old engine


http://www.mediafire.com/imgbnc.php/...50815d5d2g.jpg

old engine first days

http://www.mediafire.com/imgbnc.php/...cca404a32g.jpg

in my home


http://www.mediafire.com/imgbnc.php/...a8ace3f32g.jpg

guys tomorrow we will start the engine but I will not drive it or rev it up till wednesday
.

I have to replace front wheel bearings . both left and right are broken .


please guys stay with me I need your support

Project looks promissing... Keep the good work!

nice can't wait to see it run

guys I got a problem .

I started the car . but it is not running fine . its miss firing and feels like moded ford mustang . vaibration , feul smel . I disconnected the MAF then it works like normal .
while the MAF is disconnected I also diconnected the three front coils. but still works like its fine .

I removed the spark plugs and I found the front three coverd with black carbon .
I tested all the coils and they all works . they all do generate spark .
the teperature is between 200 - 210F

so what should I do next ??

Replace the maf.

Any check engine lights? How are the crank and cam sensors?

I did replace them . nothing changed :(

Check for vacuum leakes.