Are The HT -12s bigger then a T 25 on a factory eclipse ?

 

i would believe so, i think the T-25 is the same one mazdaspeed is using ont he new turbo protege too. I've only seen the HT-12 and the T-25, and the HT-12 is larger.

Danny

 

Are the HTs more effecient ?Cause i know you cant relaly run more then 12 lbs on the HT's but i've seen T 25's run upto 15- 17 PSI with out detonation

 

i don't know what ht is when you're talking about a turbo. guessing it for an RX-7 though. sorry knew to the 7's. but i know enough about eclipes and the T-25's. whatcha wanting to know about a T-25 for? something you're wanting to put a T-25 on? for the eclipse, that turbo sucks ***!!!!! if you want it for something else, i guess it would depend on what you're wanting it for. as for the ht, sorry i know nothing about it.
scott

 

HT-12s are the stock Hitachi turbos found on the 3rd gen RX-7.

 

yup, and they are ok. But I wish they put a little bit better ones on the 7's. I want more boost...lol. The eclipse turbos are gay, and the reason you say you've seen them run really high boost stock is because they are designed for single turbo. Notice how the eclipse is single turbo....oooOOooOooo......still GAY! That's why they can take higher boost.

 

Turbos each have an efficiency range in which it is optimal to run in. The question you should be asking is "are the HT-12's as efficient running 15-17 psi as the T-25 is running 15-17psi?". I know nothing about the T-25 (I thought it was the Garrett TD-25, right?). The HT-12's can run up to 20psi ... but they won't last very long. However, I have seen the HT-12's run 12-14psi fairly reliably. Above 14psi, the heat generation starts to become a problem.

 

I talked to someone and they said HT-15's fit the stock set-up. Now if this is right then you can have the HT-12 as the first turbo for quick spool up and use a HT-15 on the second turbo to flow more and produce more power. has anyone ever heard of this?

PS the turbos on our car are about dead, oil sprays out of them like no tomorrow.

 

the h-12's are smaller than the t-25 that comes in the eclipse

 

I've heard of this. But, the bigger turbo was the HT-18 ... I dunno if there is a HT-15. If you actually want to try this, Cliff at Turbo Power is really knowledgeable about this.

www.turbo-power.com

 

That would be a sweet setup. Use the '99 spec high performance efini turbo for the primary and use the HT-18 or larger if you prefer for a pretty much stock setup, yet get gobs more power, flow, and speed! And with the higher flow they would be more reliable too. Quick spool up of the RZ model efini turbo and once the secondary kicks in then we would have some FUN!

 

HT-12's are stock on our cars! I believe some of the upgraded twins use T-25 compressor wheels.

Eclipses run about 1 bar stock and can do 17psi no problem.

 

ht12 are smaller then t25 as someone already said, the eclipse does not run 1 bar stock its more like 10 psi.

 

You gonna share that stuff you're smoking or what?

FYI I have a nice collection of T-25's sitting in my garage.

 

2nd Generation Eclipses (the only ones to come with a T-25) run 12.5 psi from the factory. This is due to the BOV leaking off every lb of boost beyond that. Yes, the T-25 can produce 1 bar of boost for a 2.0 liter 4-stroke reciprocating motor with a 7k redline. Think about how much more air a 13B sucks in every RPM. 1.3 liters of air per rpm compared to 1 liter for the Eclipse. Also consider that the T-25 falls on its face after 6k in the eclipse because it cannot adequately deliver cool charge air at that high RPM.

And, the T-25 is just that, a T-25. The "TD" turbos you are thinking of are made my Mitsubishi, like the TD05-16G and the TD06-20G. The T25, T3, GT25, GT35/40, etc are all Garrett turbos.

 

IIRC, the stock 20B 3 rotor uses an HT-15 for the primary, and an HT-12 for the secondary that kicks in at 4K. Old aust site had several pics of these, but link died.

 

o i c...

 

think u could run HT 18's in seq. or non seq. form?

 

the stock T-25 on an eclipse in stock form hit's about 12 to 12.5 psi. yeah, the bov sucks and leaks out anything past that. it's a plastic piece of crap!!! but after upgrading the bov, you can turn it up a bit. but on a T-25 it's gonna put out all the air it can at 15 psi. anything over that and it's just being overworked and usually will eventually blow the turbo. you'd blow the turbo before you would the engine cause it just can't flow enough air to run lean (and i talk from experience cause i blew mine to hell). the 2g guys can upgrade to the stock 1g 14b turbo for higher topend (i've done this one as well but blew this turbo also so upgraded to a 20g and had no more problems blowing turbo's....with all the upgrades i had) or some other turbo. but no one wants the piece of crap T-25 on an eclipse.

as for the HT-12 i know nothing about those turbo's (yet) so can't tell ya anything about it. sorry....but i at least know my stuff about eclipse's.
scott