icefirerx7

I have a turbo II engine that I am having built by a rotary specialist in atlanta ga. I was planning on putting on a t3 50 trim which is good around 16-17 psi max safely. My question is why do people use really big turbo's and only run 16-17 psi max and have to deal with all of the lag for the larger turbo. Is there an advantage with the size of the trbo being larger even though they only use 16-17 psi? I am new to turbo rotaries I have had bridgeport carb setups but know very little about turbo stups on rotaries. any info would be appreciated thanks.

Alex Rodriguez

iTrader: (137)

its because we dont want to go BOOM but, when they want to boost aint nothing a little boost controller cant fix

now the turbo you are running i doubt 16-17psi you would get

what are your mods,standalone?,what kind of port , is this for street or track only

Evil Aviator

If you knew how to read that compressor map you would understand the issue. Would you like some help?

'87 turbo II

iTrader: (1)

woah, where is the specialist? can I get a number? and how much is this costing you?

icefirerx7

El Nene 7 I guarentee you I can hit 16-17 psi I have an aggressive street port as well as a bridge on the secondaries. I have two 750 injectors and two 1400 injectors. Haltech, apexi 3" N1 cat back 3" a 3" down pipe, 3mm apex seals, msd conversion, rotors are being shaved and the entire engine is being rebalanced to safley rotate at 10K rpm. This is a street-race car it will only be driven one to two days a week. Also I have a custom slide throttle system designed by race engine design in rossville georgia.

Evil Aviator I know how to reap the map. Thanks I remember now. I forget it is about the cfm forced into the engine.

87 Turbo Fc the guy that is building my engine only builds race engines, he will port the irons any way you want for about 400. If you want more info pm me.

rotorforce

You might want to ask someone like Brian from BNR. He basically told me that even his stage 4 would be insufficient on my mild bridge TII. To avoid boost creep, I would need a 40-45mm wastegate and a T series with at least a .59trim. I was even told that a custom manifold would be needed and that the hks manifold would be pointless. From the sounds of it your ports are very similar to mine.

takahashiRyosukeFC3S

the reason for such a large turbo, low psi, and dealing with the lag is simple. it's not the PSI that matters it's CFM. the pressure you run doesn't play a major part in your power output, how much air you can actually cram down your intake is what it's all about. if you run a smaller turbo you'll have to be running higher psi to get the same air flow as a large turbo running a lower pressure.

think about it as you breathing in as fast as you can through a drinking straw to breathe vs a garden hose (he he) or just opening you mouth wide and taking a fast breath. see? it's all about air flow CFM, not pressure psi. Pressure is just the facilitator to get cfm from a smaller turbo.

hope that helps a little,
Ryosuke

RETed

Your T5 "50" trim would produce about 150hp at it's most efficient.
It'll barely make 200...250hp at it's peak, especially under your 16 - 17psi max conditions.

The STOCK TURBO already does this.


-Ted

Evil Aviator

Well you didn't know how to read the map yesterday, lol. Anyhow, I'm glad you researched the subject and now understand why that turbo is entirely too small for the engine. You should get something based on a T4, especially if you really have all the engine modifications that you say. If you can afford them, I recommend the Garrett GT-R ball bearing turbos with their better spool-up time, better bearings, and better efficiency. The T-series turbos are considered obsolete by Garrett, their original designer.

Slide throttles tend to bind under boost. I hope your mechanic knows what he is doing.

Evil Aviator

Ryosuke, you are killing me, lol. I don't even know where to begin to correct that statement.

RETed

-Ted

rotorforce

+1

With all the work you will be doing why not go T60, T66?

adrock3217

Yeah, you have a Haltech...so why, on March 2nd, were you asking to buy a Megasquirt? And rather then knowing how to get one, you asked in a forum about it?


And if you had an engine that was balanced for 10k RPM..you wouldn't have been offering 125 and 150 dollars for a little POS Garrett T3 50 trim. You would already KNOW that you're half-bridge would out flow that. But obviously you don't. BS+1

icefirerx7

Hey for all of the BS people out ther...
ReTed what are you raising the flag to? Specify which Part is false.

I just now got started, my engine is being built if you want I can givguys number in atlanta his name is Hose Vargas. He is really into butilding 4port 13b's with carb setups that run 13k all day at the strip.

Adrock I didnt
know anything about megasquirt so I was trying to findout if it was worth somthing. Conclusion drawn that it is a piece of junk compared to haltech. Oh If you want I can post receipts for all of the stuff.

This is my fist 13b turbo fuel injected, like I said I was trying to find out about what turbo size.

Oh yeah adrock If you were buying somthing wouldnt you try to get it as cheap as possible.

The hole point of this forum was to find out what turbo size to use.

Alex Rodriguez

iTrader: (137)

thanks Ted you always come through
psh..huh..16-17 psi huh pshh yeah and i will be using a 40 trim boosting 21psi...lol

Alex Rodriguez

iTrader: (137)

I am new to turbo rotaries I have had bridgeport carb setups but know very little about turbo stups on rotaries. any info would be appreciated thanks.[/QUOTE]

so how come you already got all those mods you listed , that should put you in the well 400hp range if you knew what you were talking about...come on bro T3 50 trim with all those mods why not just go with the t60 or 66

oh wouldnt that agressive streetport plus microtech- be alittle too much for a t3 capacity

13b4me

Get a T-88 and be done with it...

adrock3217

Well, if you had truely done you're research on the Megasquirt..you would have come to realize it has a few hidden features that the Haltech does not. Like, being able to program it to run basically any electrical component on the entire car ......


In terms of tune-ability, the Megasquirt is also MUCH more user friendly. And cheaper.


Did I mention cheaper?







Oh yeah. Sorry. CHEAPER.

13b4me

Yea MSIII owns Haltech...

icefirerx7

Liek I said I know very little about turbo 13b's adrock, There is no other electrical part, I have turboed hondas in the past but only used t3's. I am just trying to findout what turbo to use. Megasquirt might be more user friendly but my haltech will be more consistent. Once it is up and running people have very few problems with them unlike megasquirt where there are always problems, and always bugs to chase out. I just read up on what other people use and bought it.

icefirerx7

would a t3/t4 hybrid be a good choice or a straight t4 t04b possibly or which turbo exzactly do I need. I am not trying to cause problems I am just trying to findout what size turbo would best suit my needs.

Hey Evil Aviator where did you hear about the slide throttle messing up when a turbocharger is used? I have never heard of any problems, anymore info you have on this topic I would grealty appreciate.

RETed

Lesse...

Why do you need to have the engine spin up to 10k RPM???


Even though you misspelled "read", if you knew how to read a compressor map, you would know the T3 "50" is too small a turbo for the 13B engine.

Or did your special race engine shop conveniently forgot to tell you this?


So this guy will do full bridge ports, combo ports, and full peripheral ports for $400?


-Ted

RETed

Oh gawd, here we go again...

What can't the Haltech control on the car?

What makes it more user-friendly?
It's still in development, so how can it be user friendly?
Sounds like a contradiction to me.


-Ted

icefirerx7

ReTed, Hose will port the irons, not the rotor housings(p-port), any way you want gor $400. Whats so hard to beleive about this, it only takes a maximum of4 to 4 1/2 hours to do it. So in reality he is making $100 dollars an hour cash. Why is this so hard for you to understand? He is not building my engine, he is porting the irons and rebalancing the rotating mass. My uncle Thomas at TJ Automatics in Atlanta Ga is who is assembeling my engine. I am just trying to find out what turbo I need. Neither Thomas or Hose like turbo 13b's they prefer high rpm's+nitrous. If anyone has forgotten the rotary engine is designed to rev. The reason I am going high rpm+turbo is when I was in Columbus GA for Imports vs. American Muscle there was a toyota starlet with a 13b, turbocharged that shifted at 10500 and he made passes at about 5.75 in the 1/8 consistently.

RETed

So what about you underestimating the T3 "50" turbo?


-Ted