Fred Villamor

Help !! I've read alot of the threads on the GT35/40 turbo , but none with the Judge ITO porting for the street . I'm still kinda new to tuning , have been non-seq. on the stockers for almost 2 years before the BANG !! I'm now rebuilding with the help of a local friend and he purchased the ITO porting templates recently . From all the reading I've done , I thought the GT35/40 was best for me , for use on the streets with an occasional trip to the track . I looked into the R85 kit , but it seems there aren't too many numbers out there yet , and/or good or bad stories about the kit. I've done all the reliability mods and all the bolt-on mods , stand alone system , wideband , AVC-R , etc. etc. ... any help/advice would be GREATLY appreciated !!! I am proficient with tools , and did all the work myself with an assistant , so I'm NOT afraid of the work ... thanks for your help

modrx7

iTrader: (1)

Fred we both know the GT40R is the turbo for you!!! Who are you trying to fool Call Sean @ A-Spec He'll tell ya...

Fred Villamor

I'm just doing my homework was curious to see what HP numbers to expect at 15psi and 20psi pulls ... have spent so much on the car already , just want to get the best BANG for the buck .

modrx7

iTrader: (1)

I was just joking with you, I wish you the best in your search for the best bang for the buck.

Happy Holidays
Edan

RETed

Porting really has nothing to do with turbo performance...


-Ted

Fred Villamor

OK , but wouldn't the car produce more power at certain boost levels with a ported motor as opposed to a stock ported motor with this turbo setup ??

Speed of light

iTrader: (8)

Well, not exactly....

....Porting will affect the engine's volumetric efficiency and thus the turbo's operating point or curve on its compressor map. A ported motor may be able to move more air (by weight) at a slightly lower boost pressure than stock ports. Therefore, the idea is to match the turbo's compressor to the level of boost and efficiency you want with the ports you have.

ijneb

Im just curious as to why you say this.

I was under the understanding that porting was everything. It becomes a bottleneck in the stock system, which is why you want to make the ports bigger, to allow more air in and out quicker, which then spools the larger turbines quicker?

Fred Villamor

Ted , please feel free to elaborate at any time ... ( now confused ) I was under the impression that you could extract more power from a turbo setup through porting , therefore eliminating the restriction of a stock ported motor , and allowing the turbo to produce more HP ??

RETed

Sorry, that was almost a troll...

To qualify my statement...you can slap any turbo on any port, and it will still run.
I might not run at it's best efficiency, but it will run.

The way you starting this thread is rather interesting, as this is one of the few threads that tried to make a connection between engine porting and turbo size.

I'm sure you've heard that porting a rotary engine is the same as changing cam profiles on a piston engine.
Changes like this affect engine VE.
When porting is done right, engine VE is raised significantly.

There are numerous turbo sizing threads in here...if you look around.
Typically, you state your engine mods an there are suggestions for a turbo to match your needs.

nyt has started a recent thread on the limitations of the GT40, and I concur with his conclusions.


-Ted

Fred Villamor

( very confused now ) basically , I want the car to be primarily a street/drag car with reliability . I want the car to be driven around , for fun , and to last awhile with big HP numbers . The motor will have the ITO porting done , mild porting done to the intake/exhaust ports , PFC , wideband , AVC-R , DP-resonated MP-Apexi N1 , HKS Twin Power , 850/1600cc inj , FMIC , Denso fuel pump ... that being stated , what is a good recomendation for a turbo kit to meet my needs ? Thanks again ... FV

Zero R

iTrader: (1)

Just to keep it clear he was speaking of a Non BB GT4082 not the Ball bearing GT4088R.

-thanks

DIRep972

Thanks for pointing that out. The GT4088 is still a bad bitch.

RETed

Apologies in advance...
All these turbo model names make me dizzy!
I was just pointing out the OEM Garrett applications, which I still keeps a GT40 a non-BB, right?

I like the GT3540 or GT35R for anything up to 400hp on pump gas.
I've messed with one, and it's a very nice turbo!

Anything larger (or more power), and prices starts to rise significantly.
It also opens up a lot more options, and our resident turbo experts can easily give their recommendations.
This is the 500hp and beyond...


-Ted

Fred Villamor

Thanks for all the help/advice guys , I appreciate the input . I'll keep readin' on

DCrosby

From what I understand Porting, Mainly I was inquireing about my street port, raises the max hp that you are able to extract from a turbo... to the tune, of with identical setups you might see 380-390 hp from stock ports, vs 400-410 from street port, this sort of logic would suggest a bridge or periphreal port would allow you to raise those numbers by another 20-30 hp.. ??? I suppose... the importance of the port for me was spool up time, and supposedly the spool up time/lag is reduced as well since more air moves over the compressor blades giving more boost pressure sooner... and since more boost sooner, means even more boost once that air makes it through the rotors, as turbo systems are geometric in the way they build power.... you get to max pressure faster, the bigger the port. So:

Up Side -> Larger Port = Faster spool, and Higher Max Hp.
Down Side -> Larger Port = More Exhaust Gases = Not Smogable

-DC

z8cw

The GT35r is very popular since it flows what most people need on this board and is effecient around 15-20 pounds of boost.

Picking the compressor you need to match up your engine flows with the turbos capabilities and your boost level goals. Porting will determine your engines flow capability. Stock ports will not flow more than 35 lbs/min at 15 psi of boost where a bridge port can flow more than 50. In any case the 35R will cover street and stock ports up to 20 psi of boost very nicely.

Next thing to worry about is the turbine which will determine your spool up vs maximum power. The stock ports won't exceed a pressure ratio of 1.5 to 1 exhaust vs intake with a .82 AR, which is exceptable for a street machine not looking for maximum power only but a good balance of spool and power.

A large street would exceed 2 to 1 with that AR and might choke of maximum power potential, so a larger AR would be in order.

Sorry for the brabble

CW

Fred Villamor

Any info is good ... thanks again

full-cruise

iTrader: (5)

FRED what did end up going with and how did you make out with it??

Asleep

Most intelligent post I have read in awhile. Nicely said.

With that said, and more than "playing around" with a couple of Gt35r (T3)'s and a now a Gt35r (T4) I would pick the latter of the two. Or, call Sean and talk to him about his "500" turbo based on the same workings with custom wheels.

Note that I have the Gt40r and would go with the Gt35r (t4) (or even better Sean/Aspec's "500").

Tony