Is anyone running a T-25 turbo on a B18C1?

I'm thinking of building a custom turbo system using the HKS tubular manifold and a T-25 turbine.

I'm leaning towards the T-25 over a 16g because of the nearly instant spool time. I'm an autocrosser, not a drag racer, so low spool time is a must. I'll just be running ~8 PSI...not planning anything nutty.

I'll have a Skunk2 intake manifold, 66 inside-trim TB (to closely match the charge side of the turbo), Skunk2 titanium retainers/springs, Skunk2 turbo cams, Hondata 4b, 310 injectors, MSD 6AL, Quaife, etc...

Anyone running something similar?

Input requested, please.

Oh - this'll be in my '98 hatchy.

Thanks!
Ben


[Modified by Benny Z, 3:56 PM 10/17/2002]

 

TOO SMALL...wont have enough for top end power...it will die off
but if you dont care..then im sure itll be fine


[Modified by SiRkid, 4:24 PM 10/17/2002]

 

hmmm...

what's your suggestion then?

remember - i'm not looking to put down 300 whp...i'm just looking for a little extra "umpf" in the low-mid power band.

i was thinking the rev-happy b18c1 would make up for the smaller turbo on the higher end.


[Modified by Benny Z, 4:28 PM 10/17/2002]

 

what i think will happen is the rev happy b18c1 will require a lot more flow than that lil turbo can support and so the compressor wheel will be operating way out of its effeciency range, and on the exhaust/tubine side the restrictiveness of the small turbine wheel will probably cause problems too.

if you only rev to ...say, 4000rpm, it might work out good.

my suggestion is to get the greddy turbo kit if you want a little more umph on a stock-type setup. then u will get boost fever and mod from there.

 

yea, up top ur turbine might actually slow down the exhaust gas flow and it might be more restrictive than it is now..but im sure the extra low-end midrange would be nice!

 

I’m not new to Hondas, but am definitely new to boost. This is a learning experience, so I appreciate the input.

I hadn’t really thought about the turbine being too restrictive for the exhaust in the high-rpm range.

What other turbos would you recommend with the HKS tubular manifold? It’s got a T-25 flange.

Remember – I want to keep a very quick spool (full boost by 3K, tops). I’m not interested in buying a complete kit. I’m a grassroots kinda guy.

 

I woudl suggest stepping up to a larger T28. We run them on 2.0L SR20DE's all day long. They can easily support 300 whp. Great spool characteristics and great top end. I carry the T28 off teh Pulsar GTiR for $650.00 + shipping. They are awesome turbos.

 

haha - yeah, same "Benny Z" from back in the day

i've started my own gig locally - "Central Illinois Imports" - we've been up for a little over a year...basically just a place for the local peeps to hang out and meet each other.

who were you on that forum? that was what...in like '97-'99ish? good times! remember "ricky crow"? oh...and "T Satta" from the old forum is on my site.

 

I wouldn't let the flange on the tubular manifold decide what turbo i was going to run. Its very easy to hack the flange off and put another one on. Ben, I guess you need to decide how grassroots you want to be... A stock 1G DSM turbo will work, and it will get you around the Auto-X fairly nicely with no surprises. A bigger 16g will take longer to spool, but will be able to breathe at the higher revs your new motor will be happy with.

Both of those turbos are fairly cheap, some are free If you want to go bank on the project, pick up a Garret 2528 and you will not be disappointed. Ball bearing T3 with FAST spool up and plenty of top end available.

I also hear that the stock turbo from an MR2 MKII is a nice upgrade and will support over 300 rwhp. Its time to learn compressor maps Ben It sucks... You need to decide what boost you want at what RPM and where you want it to die off... rarely will you find something that meets all of your requirements. There are a lot of OEM turbos available... and even more aftermarket turbos. We all know the OEM turbos are cheaper, but that doesn't mean they are useless....

 

both the t25/28's are good for a daily driven street car. they are quick spooling and give almost a linear power increase t25bb

 

Here is a dyno of a B18C1 with a T28 running 5psi intercooled.

 

I would go with something larger than a t25 on a b18c. The head flows really well, and the tiny turbo might have problems keeping up. If you romp on the gas at low RPM, there might be problems with surging also.

 

Holy Cow its Benny Z or should I say BennyZC?? The CRX forum is still alive and well here: http://crx.honda-perf.org/forum/index.shtml

Many old friends are still there, Ricky, John Moeller, No Control, etc... You gotta stop in and say hi.

I don't know if you remember me, I drive the red Crx which is now turbo with T25. Check my site below. I also drove the White 90 Prelude during a get together at Navy Pier, remember that?

You have to stop by, you will freak out alot of people.

Glad to see you still know how to use a computer. heh heh

later.
Randy aka RGAZ

 

After seeing Dutchie's dyno there, there is no doubt in my mind that the T-25 is too small. The T-28 is running out of breathe up top, maybe a larger A/R on the hot side would put you around 250 rwhp, but I dunno what you're plans for the car are...

Anyhow guys, the header Ben is talking about just happens to have X flange on it, so we were thinking, why not use X turbo. Changing flanges is NOT a big deal. I have a spare 14b turbo off of my 1st gen DSM that we were going to use... I know its bigger than the T-25, but i don't now how it compares to the T-28. This is actually my first venture in sizing such a small turbo. In the last year, I've had a 60-1 T04 on my RX7, now I put a 3rotor in it and I'm going to be using a Garret GT42 dual ball bearing turbocharger.... yeah, that's a big turbo :D

 

I have a new 16g I will sell you for $625 shipped. that would have you in boost by 2500-3000rpm. Plus it will support alot more power once you decide you want it.. Trust me you will.

 

is that a bearing turbo?