ITB's + GT32 = Fun!

[BigVinnie]

Originally Posted by mrmephistopheles

7psi from T25 != 7psi from GT32.

Won't a T25 run hotter than a GT32? Besides I was trying to make injection included as well 370cc defenitely won't make those kind of numbers...
I guess I am missing something with that exclamation point.

[REDSH!FT]

!= means not = to

[wootwoot]

I usually use these for greater or less than < >

Great fun I bet. The torque will only get better with the higher boost pressures. Wait until you are in the turbos efficency range =)

[North240]

lame

and by lame i mean coolest thing i have seen in a while, keep up the work on that beast!

[BigVinnie]

Originally Posted by REDSH!FT

!= means not = to

Exclamation point always reminds me of the Sienfeld episode where Elaine kept adding exclamation point's to the Peterman Catalogue... Man that shit was funny...

[mrmephistopheles]

Originally Posted by S14DB

I thinks that's what he's trying to say.

Yes yes. I quoted the wrong post. Fixed now.

[NemeGuero]

Originally Posted by REDSH!FT

!= means not = to

I've never heard/seen that notation. I HAVE seen it this way tho.. ~=

[EchoOfSilence]

Originally Posted by NemeGuero

I've never heard/seen that notation. I HAVE seen it this way tho.. ~=

It's C/C++ notation

anyway, THIS IS HOT SHIZZLE! i never thought a ka's graph would ever look like that. you're restoring my faith...

just... wow. how much money have you dumped, though?

[C.]

Originally Posted by BigVinnie

Hey lets start placing bets, I say Scott will make 400WHP at 18PSI!!!!!!

he'll probably make more than 400 at 18psi, remember that Ivan from PhatKA-T made 404hp and 409tq @16 psi using that same turbo, and that was on a stock intake manifold. I think that with itb's and proper tunning he'll probably make 400 at like 14.5-15 psi

[BigVinnie]

Originally Posted by C.

he'll probably make more than 400 at 18psi, remember that Ivan from PhatKA-T made 404hp and 409tq @16 psi using that same turbo, and that was on a stock intake manifold. I think that with itb's and proper tunning he'll probably make 400 at like 14.5-15 psi

DAMN!!! I think your right I just lost the bet!!!

[Neejay]

Originally Posted by C.

he'll probably make more than 400 at 18psi, remember that Ivan from PhatKA-T made 404hp and 409tq @16 psi using that same turbo, and that was on a stock intake manifold. I think that with itb's and proper tunning he'll probably make 400 at like 14.5-15 psi

Damn...good point....

[hitman]

can we see some pics of the maker? naked ones?

[JVD]

Originally Posted by hitman

can we see some pics of the maker? naked ones?

WTF? LMAO! Engine is looking insane. 270hp @ 8psi? Nuts! I've gotta get my KA-T underway. No ITB's for me though.

[RBS14]

Vinnie, you know the comment on the last page about doing the internals, well yeah.

Went back today to finish tuning. Just about had fuel all worked out, turned on the Haltech boost control (which is fucking sweet!) and then we hear some gnarly snapping/weird noises after one of the pulls on decel. #1 cylinder comp tests out at 90psi. So it looks like the ring lands blew on #1. Don't know why, we were only running about 8psi and we didn't boost spike, detonate, or go lean. Everything thing was great. Made a little over 270hp too. Hadn't even gotten into ignition tuning. haha it's gonna make a LOT of power. Had to do 4th gear pulls because it was spinning the tires in 3rd. I'll post up the sheet sometime soon. So now I get to build a motor. yay. Right in the middle of event season. Oh wells. What's another 3 months, eh?

But on the up side I'm just going to skip the whole 10psi tuning thing when I get it back together. 1.5bar here I come!

[EchoOfSilence]

Oh man, sounds like this project is getting even crazier

[Dousan_PG]

kick ass scooter
rebulid it
it sucks
haha im lvig proof
i just want to drive
im sure u are feeling that way too!
think long term!

[NemeGuero]

1.5 bar... you nutty fuck you.

[RBS14]

yeah that's the worst part is that all I want from this car is to drive it. I want to stop spending money and time and drive. But you gotta pay to play.

[McRussellPants]

That sucks to hear man.

I'd look into that intake manifold over feeding the number 1 cylinder. The way you have it setup doesn't look too hot IMO.

If I were you Id cut along the base and add a 1-1.5in angled spacer or something along those lines. In the pics it looks like the inlet is actually blowing on to the #1 velocity stack at a 90 degree angle with the stack protruding into the flow, which would suck balls for proper air distribution...


But I'm heading down the same super response tune path you are, GTiR Turbo, GTiR ITBs, V-mount, Lightweight Driveline, 256s, and all the tuning/bolton goodies to make it work right... I need to start rounding up parts.

[NemeGuero]

Originally Posted by RBS14

yeah that's the worst part is that all I want from this car is to drive it. I want to stop spending money and time and drive. But you gotta pay to play.

I know EXACTLY what you mean...

[ayuaddict]

its like being married and never getting to have sex with your wife. but you keep spending money on her.......

[SpeedMonkeyInc]

Originally Posted by McRussellPants

I'd look into that intake manifold over feeding the number 1 cylinder.

Thats interesting. I thought the manifold would pressurize and and be pretty even? It makes sense though if one runner is getting force fed air like that, it would be running lean.

[RBS14]

I designed the manifold like that for a reason. You want the air flow to get broken up (so to speak) and allow all of the plenum to pressurize before any of the runners are fed any air. That way they all get the same amount of air at the same tim. Either way we'll find out because when it's all back together we're gonna test the AFR in each runner simultaneously at a few different loads and rpms to see how far off from eachother they are. Then I can do individual cylinder trims in the Haltech to fix it. We'll see.

[daver903]

why not buy a stock replacement for the motor while you build the other one? half ass tune the stock replacement and you are good to go.

[RBS14]

because I can either afford to build a motor or drift. One or the other. So I'm going to do the one now, that will allow me to do the other later. Man I wish I had a money tree.

[NemeGuero]

Lets plant one...

[BigVinnie]

Originally Posted by RBS14

I designed the manifold like that for a reason. You want the air flow to get broken up (so to speak) and allow all of the plenum to pressurize before any of the runners are fed any air. That way they all get the same amount of air at the same tim.

Actually Scott I looked at your plenum again and there are some problems. I believe what McRusselPant's is trying to tell you is that most air density will feed to cylinder 1. Using a plenum design with a straight through plenum causes starvation to cylinders furthest from cylinder 1, cylinder one when it gets overlap at higher RPM will always take in more air than the furthest cylinder.
In order to maintain a stable more accurate flow pattern the plenum should use a cone shape design not a strait through design. This basically means that air pressure will become more stable as all 4 cylinders attempt overlap at higher RPM. Either go with a cone shape plenum, or use a straight through that is literally three times the size that you already have.

Ivans is a perfect example of a cone shape plenum using more square volume at the begining of the plenum, and less towards the end. This will reduce cylinder 1 from consuming more air at higher RPM during overlap and scavaging.


On another note you won't need fancy forged pistons. Altima/Exterra/frontier 1998 and above pistons use thicker ringlands, and are more suitable for boost with a CR in the 240sx engine at 9.2:1. You will need forged rods to make over 400WHP though it will startto get risky high reving with that long rod/stroke ratio.

[hitman]

he doesnt rev high
he doesnt need rods
usually on a boosted motor number 4 gets more air
and where is the naked pics!

[BigVinnie]

Originally Posted by hitman

he doesnt rev high
he doesnt need rods
usually on a boosted motor number 4 gets more air
and where is the naked pics!

Actually past 7000RPM is high rev for a KA, he want's to take it to 7200RPM with no drop off in power.
He does need rods he is using a GT32 and injectors that can easily make him 600WHP....
With what proof do you have that number 4 gets more air?
Blah!!!!!!! Not worth my time to argue in Scotts thread....

[ranisron]

Vinnie, As far as I remember, out of all the second gen altima (98-01), 00 piston and rings are your best friend. Some of the DET guys on altimas.net were boosting pretty nicely on the 00 engine. Stay away from 98/99/01.

Best of luck Scott. Get the build going and we will be waiting patiently for some awesome results.