yes, another "what turbo do i use thread" , what does "too small" do??
 

ok so im new on here and i cant seem to find the effects of a turbo being to small on an engine,
im going to be running a probe with a mazda klze jdm engine in it... thats 200hp and 165 tq. V6 too i might add...
obviously a rhb5 turbo or t25 is too small, but what does that mean?.. it will spin to fast and seize, or will a stock wastegate prevent that.. or does it mean it will just not produce boost, since im running 6 cyl and all does it mean that a rhb5 would only give me about 4 or 5 psi instead of 7?... and at lower rpms or what?...

if anything could someone please point me in the right direction of picking out a factory turbo that will produce about 7 psi on a stock internals.

Re: yes, another "what turbo do i use thread" , what does "too small" do??
 

when people say its too small is that it will spool VERY quickly and will be choked before you even hit your redline.

since you have a v6(or are getting one) are you gona do a TT setup? that would be the best thing to do imo, and the t25 should be good enough to satisfy you.

Re: yes, another "what turbo do i use thread" , what does "too small" do??
 

we just turboed my friends probe, with a klze swap using the stock manifold and a t-25, i was suprise at how decent the car moves with that small turbo, but still the turbo doesnt hold all the way throuhg, hes upgrading to a big 16g this month, ill try and get some pics.

Re: yes, another "what turbo do i use thread" , what does "too small" do??
 

i did think about a twin setup, but i really just want to go with a single...


how much boost did he get out of that?

Re: yes, another "what turbo do i use thread" , what does "too small" do??
 

You would get a LOT more information if you checked out the Forced Induction forum at http://forums.probetalk.com

Re: yes, another "what turbo do i use thread" , what does "too small" do??
 

it means the turbo is so small that it simply cannot flow enough air for the engine and at high RPM's the car will fall on its face...

Re: yes, another "what turbo do i use thread" , what does "too small" do??
 

i've checked out the f/i on probe talk,infact im on pt about everyday, but i couldnt find the answer to this on there... i dont really like probetalks search bar, its not narrow enough,

i've been non stop researching factory turbos for 2 days and i think i've decided to keep my eye open for a 1st gen dsm turbo, due to its slower spooling...and whatever factory intercooler i can get my hand on for the cheapest

Re: yes, another "what turbo do i use thread" , what does "too small" do??
 

the turbo was tired been on 2 setups before his and produced a whopping 4-5 psi, but it pulled pretty nice, Probably good for a low 14 second pass.

Re: yes, another "what turbo do i use thread" , what does "too small" do??
 

Would a MKIII Supra CT26 turbocharger be "ok" on a 2.5 V6?

Re: yes, another "what turbo do i use thread" , what does "too small" do??
 

I think the most common factory "big" turbo is a T3 63/60 off a thunderbird. I almost suggest that turbo for all cars ever made. lol
It'll be a hell of a lot easier to find the flanges, lines, ect.. for that one than the CT26.

Re: yes, another "what turbo do i use thread" , what does "too small" do??
 

hmmn.. this seems like it would be the best bet for me.... is there any other cars that the t3 came on?, cause turbo-brids are kinda rare around here

Re: yes, another "what turbo do i use thread" , what does "too small" do??
 

Not that rare.

An early 80's nissan/datsun came with a 60/63 also. Just has a bastard of a DP Flange!

Also too small of a turbo puts it out of it's effeciency range, which causes excessive heat in the charged air, which mean blown engine sometimes.

Re: yes, another "what turbo do i use thread" , what does "too small" do??
 

CT26 will only get you to 270-280 whp (i know, i own a mr2) and it maxes out at around 16-18psi after that just hot air. you can get a CT20b off a supra and it will get you to 290-300whp at about the same pressures (some guys are making 300whp with it but very few) ATS Racing has put out a turbo based on the CT26 called the CT27 and it will support over 300hp.

Re: yes, another "what turbo do i use thread" , what does "too small" do??
 

i dont know about a ct only getting 240hp... i have a .63/.60 t3 and if ------- dwarfs my turbo. plus, any engine running 16-18 psi better be making more than 240 hp. ---- most stock d's running 12psi go to like 230. i think a ct26 would be pretty good for that car. i have a few of them here if you need a flange or something made let me know, im in a advanced cnc class this semester and we get to make whatever we want.

Re: yes, another "what turbo do i use thread" , what does "too small" do??
 

psi does not equal horsepower.... you can make a small turbo put out a lot of pressure but that does not mean it will make a lot of power... you can push a KO3 to 22psi but it only makes about another 15-20hp than when you run it only at 16psi... 20hp for 6psi is not good...

Re: yes, another "what turbo do i use thread" , what does "too small" do??
 

we just turboed my friends probe, with a klze swap using the stock manifold and a t-25, i was suprise at how decent the car moves with that small turbo, but still the turbo doesnt hold all the way throuhg, hes upgrading to a big 16g this month, ill try and get some pics.
Yes let me know how that works out. My cousin did a Mazda Millenia it too has the KLZ engine with a CT-26 supra turbo and it ran pretty go od but before we coulddyno it threw a rod. But theKLZ-e Japanese engine mayhave a little more balls than the KLZ. I would bevery interrested in how that works out for you.

Re: yes, another "what turbo do i use thread" , what does "too small" do??
 

a ct26 is NOT a small turbo, thats what i said in my thread! i have a .63/.60 and at 12 psi that thing was probably making 230hp. at 18 with a ct.. well maybe ill just have to use one to prove you wrong

Re: yes, another "what turbo do i use thread" , what does "too small" do??
 

Yes. CT's are modified Garrett T3 hardware built by Toyota.


On a '94 1mz-fe:
Running real lean (14.2) it was making 240whp (310bhp) @ the stock wastegate's 5psi.
When richend out some to 12.8 & spun up to 10psi:
http://htracing3.homestead.com/files...y10lbsDyno.jpg

That's 345bhp on the other side of Toyota's ineffecient v6 A/T @ 10psi.






It'd be a great factory turbo to run on yours. Just leave it at 5psi.

Re: yes, another "what turbo do i use thread" , what does "too small" do??
 

(7M-GTE's) CT-26
Rated Flow Capacity:
437cfm (33lb/m)
Compressor A/R Ratio:
0.70 A/R
Exhaust A/R Ratio:
0.50 A/R
Compressor Trim:
40-trim
Bearing Type:
Full-Floating bearing
Optimum Boost Level:
8-10psi
Max Recommended Boost:
14psi
Water Cooled:
Yes
Estimated HP (7M-GTE):
300-320bhp @ 12-14psi



7M-GTE (North American/European):
Displacement:
2954cc
Horsepower:
232bhp@5600rpm - 5psi/0.35bar
Torque:
245ft-lb@3200rpm - 5psi/0.35bar
Bore:
83mm
Stroke:
91
Compression Ratio:
8.4:1

The MR2 & mark3 supra share CT26's. The only main difference is that the Supra(7m-gte) turbo is single entry, mr2 (3s-gte) is dual.
The CT27 is a joke. It is a widely done modification to machine a 57trim T04E compressor & clip the exhaust turbine. That company does the same thing everyone else does, calls it a CT27 & has people pay more for the same thing.

That being said ya, if a stock CT26 isn't large enough, have someone clip the turbine & put a new compressor in it.
The same car above with a 57trim T04E & 7* clipped turbine made 320whp & blew the first transmission. 320whp slightly lean melted a ring & took the second transmissions third clutch, 375whp burned every clutch out in the A/T, melted another ring & burned a hole in a piston.

(57trim T04E & 7* clipped turbine)
http://htracing4.homestead.com/files...26bigturbo.jpg
http://htracing4.homestead.com/files...bighotside.jpg

Re: yes, another "what turbo do i use thread" , what does "too small" do??
 

the klze has the same block as the kl03 except with higher compression pistons. on probetalk they say it could possibly handle 14psi.... but im not even gonna try.. i wanna run about 7...

Re: yes, another "what turbo do i use thread" , what does "too small" do??
 

we'll see. you information looks good on paper. but so do all those people that say you can only run 7psi on stock d series. i can see in a supra that a ct can only support 260hp. but if that turbo were on a d series, i bet i could make over 300 on a stock ct26. I sent my engine to the machine shop today. when i put it back together and make a manifold for one of my boys ct's. ill try it out. 20psi, even though its pumping hot air, will make good #'s. its stoopid to fight over the internet.. so look for my thread in a week or so.