Well I am officially "insane" I have decided to get rid of my TO4S and thought I would do a small upgrade

Should get the bad boy in a few days,may be a little too big for the street but I hope to retire the car from "active" road duty and turn it into a circuit racer may even see the "odd" 1/4 mile run.

And YES I will be running LOTS of Boost
hence the decission to upgrade the turbocharger, will post some pics when I get it.

 

Bigger is Better from my experience. I remember the first Turbocharger I bought and the seller told me it was big enough for my applicaton. Well I am sad to say I have upgraded the Turbo 4 times now and I am really happy now. A Turbonetics T-76 did it for me.
Good Luck

Albert

 

Hi Albert

Yeah that is my feeling too !

The turbo I chose is basically a T76 compressor wheel size, with a fairly large exhaust wheel/housing combination to suit my engine.

I have been lucky, this is only my second single ! This one should be enough for my new HP goals

Pete

 

Hey guys, I am contemplating a PTE67H, which is a 67mm Q Trim big shaft with a .81 ar. This turbo is similar to a t66, slightly larger, and uses a Garrett GTQ-RS wheel. The .68 ar is what the supra guys are using. I figured since the Supra guys use a .81Q trim T66(while we use a 1.00 typically) that I would go one size up to the .81. What do you guys think? Also, I hope to see 500rwhp with a street port. Do you think this is realistic? On the Supra they see 700rwhp at 2.3 bar. This is a dedicated road race car. Thanks for any input Carl

 

Woo Hoo!

 

Hey Carl

I was talking to a guy in Sweden the other day (well over some time now) and he has experienced consitent high EGT's when running such a small a/r rear housing on a 13B. Regardless of richness and ignition timing he was hovering around 950c when pushing 400rwhp or any boost above 0.7bar. After some consultation I got him to change the exhaust housing to a 1.32 his EGT droped over 100 deg C ! and never rose above 850 deg C even at high boost/power. He was running a T76 turbo, I am not sure on the wheel trim though ?

Rotaries are much more sensitive to excessive exhaust manifold pressure, so be carefull ?

 

SP66 2.596 / 65.9 3.601 / 91.5 Q trim 2.693 / 68.4 3.111 / 79.0 .68
T78-33D 2.598 / 66.0 3.543 / 90.0 T78 2.559 / 65.0 2.913 / 74.0
PTE67H 63 trim 2.626 / 66.7 3.307 / 84.0 Q trim 2.693 / 68.4 3.111 / 79.0 .68
T51R KAI HKS (Garrett) GT 42
56 trim 2.768 / 70.3 3.701 / 94.0 GT?
76 trim 2.811 / 71.4 3.228 / 82.0 (1.00)
The numbers above are, in order;compressor wheel inducer/exducer, turbine wheel exducer/inducer, and ar if available.
I post these for comparison to get a further opinion on th PTE67H. I can go to a 1.00ar, but I want my powerband from 4-7000, and I thought that might be to big Thanks, There are not alot of guys who even know what these numbers mean. I really appreciate the help.here is the address of the site w/ the info http://www.moreboost.org/turbos.htm Carl

 

Sounds good Peter,

Cant wait to see the pics.

 

Too big for circuit racing!

For similar money you should have got the GT42/45 BB turbo

 

I got it & can get them real cheap

My boost level will drive it Steve.....well thats the plan LOL + my traction control will mean the turbo will be well spooled up on exits as I can hold the throttle flat !

If the same "very similar" size turbo can work well on a circuit racing 1.5lt 4 cylinder from 6.5k to 10.5k rpm I am sure it will work well on a 2.6lt 13B running from 6k to 9.0k I don't care for a majority of boost below these revs at all.......BB would be nice but they are more expensive to rebuild and cost allot more for the initial purchase.

See what happens, should be fun either way

 

About the PTE67, My friend has that turbo on his supra, with the smaller .68 exhaust side. I am very impressed with it. He has 30psi by upper 3000 rpms. Its kind of hard to tell exactly where spool up is but it is some where in the range of upper 3000 or lower4000. Very good turbo. He is thinking about going bigger, I think the PT 72 or 71 because he was so impressed with the spool up of the 67.
Nick

 

50tooslow, do you know if he has the P trim, or Q? Also AJC, check the site I linked above, Aa T51KAI uses a GT42 wheel. Anyone care to comment on .81 vs .96 on the PT67 for a road race street port? Rice, it seems alot of guys are running a .81 ar on 60-1, 62-1, and making 400 without the EGT problem, are you saying its the mismatching of the hot and cold sides creating the high EGTs in your friends car? Interestingly Precision says the same thing re the T66, way to small a hot side, the "67" is their answer to that. Carl

 

rice,
how much can you get the t51 for, and the gt42/45? in u.s. dollars.

 

Check your PM I do a number of custom non BB turbo's ......... so if your after greater detail PM me.

 

If you have a custom turbo made, how exactly do you go about the plumbing and pipes?...Are they custom too? Or do certain turbos have similar layouts?

 

Plumbing both IC, oil, exhaust etc need to be custom fabricated to suit your application. If I have enough demand I will make my own "kits" but in general most enthusiasts who want to run extreme turbos like the one above want to fabricate their own bolt on's

If you want more detail about purchasing one and what extras you will need PM me, but there is allot of work involved

 

Have fun!

I am actually going backwards! I have gone to a BB GT40 turbo on my new engine!

 

Thanks Steve. Hope to see you around a few different tracks this year, I have had a slow one last year but all things are good now (even have a tow vehicle) so should be busy traveling to different things.

Are you gonna do some circuit stuff this year ?

 

WOW ! I got it today

0.72 front housing 73mm "inducer" compressor.
1.05 rear 78mm Turbine !!! "inducer". I dont have a digital camera but will take normal photos' and develope them (then scan) so have to wait a little for photo's........

Should be a fairly easy fit up too

 

Hurry up and post a pic....

does it look like this...On the left

 

Holy ****!

Peter, seriously. That thing would be more at home on a 20B drag car, not a circuit racing 13B. I had a smaller TA than that and I didn't get boost until 4000rpm and fullboost until 5000rpm.

Even the turbo on AVENGEs Datto 1200 drag car is that big and he is making 700+ flywheel and running 8.5.

 

 

Thats not Rices new turbo. It is mine.

How much bigger is the .72 comp cover?

I only have a .60 comp cover with a 76mm comp wheel.

I put my old high flow in the pic for size reference.

Does it look like that Pete?

 

It is exactly like this....

T51



Mine has slightly different marking on the front compressor cover (looks like the BB later generation ones) With "squarer writing" and EC-1 and M24 in raised lettering on the housing

The exact wheel dimensions are as follows (after taking the covers off and putting a vernier on it.

***

I have one of those pictures by 12at for another engine project I am doing but with a bigger compressor wheel in it.


This T51 is a bit lighter than the other type (mine is very similar to the HKS Kai & SPL offering) more compact and easier to package (i.e. run an air filter & not cut up half the car to fit the turbo !)

Steve I do want to run a minimum of 3 bar absolute pressure when I race it (or 2 bar gauge pressure "29psi roughly) hence the choice of turbo, that and I wanted the least possible restriction on the engine + little low to mid range power. So long as it comes on line by 5.5k I will be happy, sounds wierd I know but this is how I drive around most tracks and I find the sudden mid range punch of the TO4 (even with very large exhaust housing) very unsettling on the exit of an apex on low to medium speed corners. 6k to 9k is the range I want to focus on for maximum benifit...... see how we go ?

 

My realistic goal is for 700 flywheel HP (there is potential for much more, but I still want it to have a decent life span), I had 560 or there abouts before running 20psi on the small turbo and if I can get 80% of my maximum boost by 5.8k rpms then I will be happy I am not worried about the boost curve following the rpm curve (this is what I prefer) it makes for less "exponential power generation" though I feel this will just happen as bad but at higher rpm LOL. The only lag I feel I will have will be proportional to rpm and if the manifold is made right the boost responce in the rpm band I want to use most "5k and above" should be more than acceptable especially with the other systems I will be running allowing full throttle on corner exits hence helping spool up the heavier rotating mass from low revs (below 5k rpm).