TD05 or TD06 for RB25?

[curbsurfer253]

I want a street setup for my rb25 with lots of low end power, good response, and a strong pull to redline. Which turbo is better for an RB25, a TD05H-18G, or a TD06S-20G? I wanted a td05 but that size turbo comes stock on greddy turbo kits for civics, integra ls, gsr, a 350z kit comes with 2! and so on. The TD06 comes on greddy kits for a ka24de which is closer to the rb25 in displacement too.

[eh?]

did you see that graph I posted on 240sx forums?

[cyris3d]

60-1/t3

[curbsurfer253]

isnt that a precision turbo? anywho, whats that have to do with a td05 or 6?

[cyris3d]

everybody seems to want to spend a **** load of money on a greddy turbo.. this is just to show you dont need too..

[WDRacing]

I think the T3 will run out of steam at much higher boost. I'd opt for the T3/TO4E in 50 trim. Cheaper and better in my opinion.

As far as TDO5/6 goes, I don't use them. Cost comparison keeps me with the Garret series. So I can only offer what I know.

WD

[curbsurfer253]

thanks for the replies guys, but this really has nothing to do with the cost and comparison of other turbos. I completely understand and have seen other manufacturers such as garret or ihi turbos pushing rb25's well past 500 hp. thats not the question, the question is: which turbo would have the better balance of low end responsiveness and a strong pull to redline more geared towards useable street power on a rb25 a TD05H-18G or a TD06S-20G ?

[candela]

the td06 will suit that displacement MUCh better. Td05 housings are used on stock 14b, 16g, 18g and -IMO- weak *** 20g's. The true 20g comes in witha td06 hot side (as well as comp housing) and it MUCh better suited for larger displacement. I was making about 19psi by about 3600 rpm (in a 2.0 w/8.5:1 CR) in 3rd gear. Am RB25 would make that MUCh sooner simply do to the increased displacement...

With an 85% VE (2.5) that compressor shoudl be effiecient on that car to hold at leist 23psi to redline (I used 7500rpm).

[BoostFab]

greddy use the 18g on a honda b-series kit. the 20g were use in the Kit for the 1996-98 Nissan 240SX. these turbos are made by Mitsubishi, fyi.

the 20g can push enough air for over 450hp. IMO the 25g, on the hand would be a good upgrade for rb25.

[Yellow4g63]

Lets not forget about Mitsu turbo's the Shafts are no where as strong as garrets and need to be service more often than a garret.

[curbsurfer253]

are you talking about garrets in general or hks turbos? does anyone here have a td06-20g on an rb25? i'm starting to lean towards the td05h-18g because that turbo would have crazy low-end power and wouldn't spin the tires as much as a td06. honestly, why have more than 360 whp in a 240 built for street driving? you wouldnt go anywhere, just start a smoke show:ylsuper haha.

[Yellow4g63]

I'm talkin about Garrets vs Mitsu turbo's. The just last longer and take abuse better. But since your heart is set on one but a TD06 20G. Your going to have to fab someting up for the turbo flange since it wont just bolt up. Should kick *** tho then save for a rebuild lol.

[cyris3d]

aussie guys put TWO 20gs on their 2.7lt motors.. im sure one 20g on a 25 will do just fine..

[curbsurfer253]

ok, if you guys are so set against mitsu turbos, then what size turbo from any other manufacturer would you reccomend to get 375-400 whp, minimal lag, same price range, and useage of the stock manifold?

[Imissmyturbo]

50 trim T3/T04E with a .63 AR exhaust will get you to your power goals with really good spool. I feel this turbo is a bit too small for an RB25 but it will work. Step up to an .82 AR exhaust housing and you will make more topend power with a little bit more lag. I would still say that is an undersized turbo. A 60 trim T3/T04E with an .82 AR exhaust housing is good to just over 500 WHP. It will be a little bit more laggy. If your looking for a really good turbo I would go with either a Precision SC61 or an SC34 (fast spool). Now one thing to remeber is that a turbo that spools too fast will resault in lots of wheel spin. I have an AGP RS65 which is the same as an SC61 just from a different shop.

[cyris3d]

60-1/t3

[Red_Liner]

Also u have to take into consideration the difference in design between Mitsu blades and Garrett blades...dont know if this is true for the newer turbo's...

i had a TDO5-13C on my volvo, came with it from factory.....quickly spooling little sucker but runs out of breath too fast....the straight cut blades on the Mitsu's arent good for high rpm that raised boost brings....the straight cut blades start to cavitate and u loose power...

then i switched to a stock .42/.48 Garrett.....MUCH better top end, still runs out of breath at 5500 rpm but thats also due to my cam....the helical blades help with airflow at higher turbo rpms

my T3/T4 is the best..... .48 exhaust housing with a .50a/r Q trim compressor housing....very nice......good spool and yet lots of top end

[BoostFab]

i'm starting to lean towards the td05h-18g because that turbo would have crazy low-end power and wouldn't spin the tires as much as a td06.

if you must stick with mitsu's turbo, i don't think you should go with the 18g for the RB25; the 18g is primarily for 1.8L motors. might as well stick with the stock turbo

honestly, why have more than 360 whp in a 240 built for street driving? you wouldnt go anywhere, just start a smoke show:ylsuper haha.

uuuug, bigger turbo! it allow some lag to compensate for traction issue. *cough*: wider wheels & tires

honestly, i wouldnt sit at 300ish whp if i'm running a rb25.

you should look into garrett's turbo as well.

[Red_Liner]

if u want only 300 whp might as well go with a Ca18 or an Sr20...

rb's are fo big boys!!! hahaha....yea

[curbsurfer253]

do you people just jump in and not read any other post? I'm looking for 375-400 whp. clearly posted a fews posts up. what turbo do you reccomend to get there with minimal lag and still utilizing the stock turbo manifold?

[Yellow4g63]

The Mitsu turbo dose not use the same flange as the Stock RB. If you get a DSM turbo it will be close but it won't be the same. The Greddy Mitsu turbos are way diffrent flange.

[curbsurfer253]

really, i'm pretty sure a td05h-18g bolts up

[cyris3d]

the flane on the rb25 is a t3 flange.. the flange on the mitsu turob is a mitsu flange.. they wont blot up..

[cyris3d]

T3 flange

DSM flange

[Red_Liner]

Best bet if it uses T3 flange is clearly a T3/T4 combination...

because they are so many varied combo's i'm sure you could find a pretty nice combination for whatever the hell u want it for

[Yellow4g63]

T3 flange

DSM flange

Got a pic of the greddy flang? that thing is way diffrent than any of those lol. A freaking triangle

[BoostFab]

what turbo do you reccomend to get there with minimal lag and still utilizing the stock turbo manifold?

i think a T-61 would be great on the RB25

[akira0]

Good start would be to get some comrpessor maps and do a little math. For the life of me, I have yet to find any comrpessor maps for any DSM/GReddy turbo's to see how they would do...

Going off my calculations, and what I am seeing here gave me the exact same conclusions good enough for a freshman effort on the RB. The T3/T04E 50trim .64A/R seems to be a very good choice. The only thing I don't know, is the variable efficency that the RB25 has, which would effect top end airflow. I have read the exact same turbo on an old I-6 out of a 280Z suffered from top end, resulting in the drop off of HP and Torque since the engine is trying to scavange exhaust out of the cyl. after 6krpm. The VG30DETT has the same problem on the stock turbo's also. If you see a dyno off a Z, you will see it's powerband fall flatter than a pancake after about 5600.

Making the A/R over 80 would be a good decision IF the VE of the engine is below 85%. Somehow, I doubt that but I don't know for sure.

I also asked Sydneykid over on the SDU forums, guy knows his stuff. He suggests this turbo over the T3/T04E:

We use this Garrett GT25R spec for around 400 to 450 bhp.

0.86 a/r Turbine Housing0.70 a/r Compressor HousingWatercooled Centre48 Trim Compressor Wheel47 lbs/min Comp Flow76 Trim Turbine WheelInternal Wastegate

Based off the maps available on Garrett's website, and his real world experience with the turbo itself, it is very feasable to get around 400HP at 20PSI on this turbo with almost no top end loss on this ballistic series turbo.

These choices in turbos are almost even in spool time, which would kick in around 3krpm.

If you can get your hands on the compressor maps for the TD/DSM series turbo's, I would be more than happy to see what type of output you can expect on the turbo doing a lil math. Hell I would want to know if it's a better option too before I buy my turbo ...

::Correction:: VOLUMETRIC efficency, not variable

[IvoryJ30t]

really, i'm pretty sure a td05h-18g bolts up

snowballs chance in hell.

[GTR Shop]

Why do people persist on using '60s technology?!?!?!TO4B belongs in the scarp bin..its had its day.. time to moveon.TO4E not a bad wheel, but there are better.. only a option if its cheap enough.TO4S MODERN wheel design that size for size against the others makes more power, makes the power earlier and more efficiently also.

TD05 is too small period.TD06 once again, why cook on an open fire when we have microwaves? Greddy/Mitsi use lot of different flanges, so on the mention of a setup, you can't discount it without physically looking at it.. I have a TD06/TD07 setuphere that will bolt straight to a T3 flange.. its sqaure T3 in, with TD06 3 bolt out.. go figure

akira0: That turbo is a -002, its also a T25 flange, with tiny exh wheel. Why mod your flange to fit it then run a turn\bo for a 1.8/2.0l??Yes I have extensive experience with those turbos, both the -001 and the -002.They are a T04S cold side.

'Know' and 'doing' are 2 different worlds...