HT18/T3 turbo query

[Crucible]

Im looking for a reputable and relatively cheap t3 flanged turbo to replace the blown chinese t3/4 on my old car. Im looking for something more responsive and non chinese this time round. I dont have the funds for anything new.

Im seriously considering ht18 with t3 housing. Ive been looking on TM but nothing much on there at the moment.

my questions are:

1/ are the ht18s all the same? I understand they are rx7 turbos but what series would suit or maybe flow better??
2/ Which t3 housing suits? have read guys use ones off rb20, are they all the same a/r or are there differant a/r's for rb20? Ive read 15-18psi around 3500-3800 is achievable which is what I want.
3/ Any recommendations on who can mill the housing to suit?
4/ Will this combo flow enough to make say around 180kw atw with 8.9:1?

Ultmately I want a more responsive turbo this time round but just curious on what sort of figures guys have made with them.

cheers.

[QikStarlie]

from memory the earlyer ht18's ran a single scroll rear and the later ones are the massive twin scroll. but the rest of the turbo is the same. they arent super responsive even with at t3 housing on them. since the rear wheel is bigger than normal t3, compressor side is smaller than the biggest t3 wheel. they are really designed for high exhaust flow. should be good enough for you want to do though

a normal t3 with around a .48ar exhaust housing and a 60trim compressor wheel. would work good, but probably not so easy to find

[evil_si]

Ht18 from fc series 4 or 5 rx7,

12a ht18s are a bit smaller from memory

Rb20 exhaust housing with 04U cast on the turbine inlet is the one to look for

Any good machinist should be able to machine it out. Otherwise i can arrange if you get stuck

[Crucible]

from memory the earlyer ht18's ran a single scroll rear and the later ones are the massive twin scroll. but the rest of the turbo is the same. they arent super responsive even with at t3 housing on them. since the rear wheel is bigger than normal t3, compressor side is smaller than the biggest t3 wheel. they are really designed for high exhaust flow. should be good enough for you want to do though

a normal t3 with around a .48ar exhaust housing and a 60trim compressor wheel. would work good, but probably not so easy to find

good info thanks.

Thats good to know ht18 comp side/core are the same, makes finding one a bit easier. Are you suggesting using .48ar rb20 housing>HT18 or using a complete t3 turbo with that size housing and 60 wheel? sorry i wasnt sure on that

The exh on my t3/4 is .70 twin scroll and gets around 15psi @ 4600, was ok for WOT, but power comes on too late. If I could get that around 3500 it would be loads better and make it more drivable. yeah .48 sounds about right to me.

[narlystarly]

My 16v 4AGTE Corona made 195kw on 17psi with the HT18/RB20 hybrid with link V5 as a power comparison.

[Crucible]

Ht18 from fc series 4 or 5 rx7,

12a ht18s are a bit smaller from memory

Rb20 exhaust housing with 04U cast on the turbine inlet is the one to look for

Any good machinist should be able to machine it out. Otherwise i can arrange if you get stuck

Ah ok. I read somewhere some t3 housings are easy to bugger up..too thin? so 04U Rb20 is the one, sweet. Will definatly keep you in mind, thanks for the offer.

[Crucible]

My 16v 4AGTE Corona made 195kw on 17psi with the HT18/RB20 hybrid with link V5 as a power comparison.

Nice so capable of reasonable power then.

Wish I could go for a ride in a 4agte with that turbo so I can see what it spools like etc. As long as its not way laggy like my old turbo.. thats a start lol.

[edwagon]

I made 218rwkw with one of these on an sr20de+t down at Hi Velocity, so they were proper rwkw.
That was running 18psi of boost (20 through the midrange ) on 10:1 compression - starting to run the gauntlet on shaft strength at that kind of load, but it did flow well enough, and was still gaining power per psi added (just)

If you want more response, what about a td05?

[Crucible]

That was running 18psi of boost (20 through the midrange ) on 10:1 compression

wow, thats nuts!. always thought you needed around 8:1 static comp with boost levels that high. guess its all in the tune huh?

If you want more response, what about a td05?

Yes true a td05h is another option. I owned a levin with twin scroll td05h and it went very well with good response. Im looking at options for the manifold on my trueno which is t3 flange. I quess welding a td05 flange onto the t3 is another option and current mani is made to suit twin scroll too. hmmm.

From memory the exh flange on td05 mounts on quite an angle so not sure if I could make it work? drain heights, clearances etc.

will def do more homework on that though.

[Bazda]

Masterpower T04e with 0.48a/r ex housing..

[iOnic]

You can get responsive T3/T4's. The one I put on my partner's 1300cc 4EFTE makes full boost (14psi) just after 4000rpm - .48a/r exhaust. I'd imagine a 4AGE would bring that down noticeably.

Otherwise hard to beat a twin scroll td05hr

[d1 mule]

my old ht18 t3, ran out of puff at 15 psi on a 4agte got 230 whp out of it.
made full boost at 4200 on a 8.0:1 gze

[Crucible]

Masterpower T04e with 0.48a/r ex housing..

Ive been offered a New MasterPower GT28 T3 60trim for a very good price. Would be perfect for what im after but still out of my budget at presant.

You can get responsive T3/T4's. The one I put on my partner's 1300cc 4EFTE makes full boost (14psi) just after 4000rpm - .48a/r exhaust. I'd imagine a 4AGE would bring that down noticeably.

Otherwise hard to beat a twin scroll td05hr

Yes would love a new turbo but a good quality Garrett or Turbonetics is way out of my price range. not interested in chinese knock off rubbish anymore, they just dont last and turbo rebuilders wont touch them.

With you on the Td05h, awesome turbos and rebuildable.

my old ht18 t3, ran out of puff at 15 psi on a 4agte got 230 whp out of it.
made full boost at 4200 on a 8.0:1 gze

Thats good to know, so 8.9:1 should be a little more responsive aswell. Im not going for big power anymore, just want a common cheap turbo thats rebuildable and a bit more responsive.

[QikStarlie]

we used to run straight t3's with a .30 exhaust housing and 60 trim compressor wheel, on our gt starlets, (4efte 1300cc) would get 18psi under 4000rpm. and just over with a .36 housing. 170kw at wheels no worries.

4age you'd want to run something bigger like a .48 as i said before.

would work better than ht18, but not as easy to find.

[Crucible]

we used to run straight t3's with a .30 exhaust housing and 60 trim compressor wheel, on our gt starlets, (4efte 1300cc) would get 18psi under 4000rpm. and just over with a .36 housing. 170kw at wheels no worries.

4age you'd want to run something bigger like a .48 as i said before.

would work better than ht18, but not as easy to find.

Interesting, thanks for the reply.

As a matter of interest any idea what cars use a straight t3? I know they are on rb20-25 but they are ceramic eh? like you say hard to come by..

[Vertigo]

what do you guys think of the DPR turbos?

[Crucible]

what do you guys think of the DPR turbos?

viewtopic.php?t=74059&highlight=dpr


Ive been doing a bit of homework on the TD05H. From what Ive read the evo3 big '16g' which is single scroll is the biggest and flows more @ 550cfm. but is the laggiest according to the mitsu guys. So that leaves evo 1-2 or evo 4-9. From evo 1-3 they run a single scroll and evo 4 up they run twin scroll.

I cant find any exh a/r for td05s. Anyone know what will be the more responsive? the single scroll evo 1-2 or twin scroll evo 4-9.

If i cant find a good ht18 in just going to sell my mani and make one to suit td05h.

Turbos...so much homework

[iOnic]

Evo 4+ twin scroll are more responsive and generally in better condition.

[Crucible]

Evo 4+ twin scroll are more responsive and generally in better condition.

ah ok, thanks man

td05h is starting to look like the better option, plenty of evos around and seem to be a few good 2nd hand units available on TM. rebuild kits look fairly well priced aswell.

[tsoob]

I just sold my turbo.. would have been perfect.

Steve could make you one if you have the housings..?