Turbonetics T66??? All top end? Compare to?
 

Hi everyone,

I have been reading so much that my eyes hurt, but I have yet to get a sufficient answer. The FD that I'm looking at has a Turbonetics T66 on a large streetported engine. The engine is brand new; therefore, I cannot drive the car to know how it will really feel like because of the break in. Everyone talks about the RX6 and the GT35/40 and the T78 and T04 etc. but I hear very little about the T66. I would assume that it is smaller than a T78. I would also assume that the T66 would spool up faster than a T78. I know that I'm doing a lot of assuming and you know what happens when you assume! (In case you haven't heard the joke--You make an ASS out of U and ME) Anyways, I just don't want to jump into something and be disappointed! What turbos are comparable to the T66? What kind of boost lag can I expect? If I have the car tuned to only have about 320 RWHP will I be wasting my time with the single (I'd already be more than doubling the HP from the Vert)? The car is beautiful and basically everything is new on the car. Anyways, as much input as possible would be great.

Thanks,

Alan

I would think you are wasting your time with that single for only 320rwhp. You can get that with the stock twins safely.

T-66 is almost exactly the same size as the T-78. They will be very similar.

the greddy turbo #'s(t78) have no relation to the garrett/turbonetics #'s(t66). the garrett's use the wheel size in mm for the number(makes sense) while greddy seems to pull the number out of their ass. check the single turbo forum.

A T66 Qtrim 1.00 ar, or a 1.15 is good for 450-500rwhp, I have seen the dynos on that. Most T66s out there are not Q trim, and many were purchased from Supra guys. If that is the case, the hot side will be too small, and it won't make anywhere near that power. What are the specs? What engine management? What fuel system? What ignition(you will need to boost 20-25psi to see those #s)? All these answers will give a good indication of the overall system, and whether it was slapped together, or well thought out. LMK, I will give you my opinion(assuming you want it ;) ) Carl Byck

Carl, I want your opinion :)

That's soo sweet.............. The T66 kicks ass, I have had a couple guys email me their dynos privately, and that turbo is good for 500rwhp with the 1.15 Q trim. The 1.00 makes high 400s as well. another member and I are looking into a GT3540 with a T4 divided flange, that may also be a hot ticket. I also think the GTQ PT67(TO4R) with a 1.00, or slightly larger AR is worth trying. I can't wait to finish the widebody, so I can start trying some of these combos. Carl

did you ever try that map?

Carl ........ I think your selling the Turbonetics T66 short there as I have a 1.00 Q trim and it's making 600RWHP on pump gas with methanol enrichment. If I was running C16 it would make even more plus there is still a little more boost left to play with ....... lol

pianoprodigy ........ You should be making boost from 2-2500rpm if your turbo has been spec'd well.

I've seen .81's and .84's make well over 600 RWHP at reasonable boost also.

crispeed
87 RX-7 TII
9.204@150.47mph
2600lbs
un-tubbed

That what I was looking at getting. The GT66 from Innovative with .81 A/R and P trim.. Im looking for 500rwhp with pump and Alcohol injection at 20lbs.

Im new with the turbo stuff.. Can someone explain A/R and the trimw of wheels?

Thanks

Josh

Ok, this is what I'm looking for. I don't know everything about the car. I know that it is running a Haltech and has upgraded fuel pumps and lines. I didn't ask about the injectors. If I'm making boost from 2-2500rpm as was said above, what will my dyno curve be like as opposed to the various twin setups? I have driven only two FDs. One was bone stock the other with Pettit upgraded twins. How would a T66 compare for low end for around town driving to these other two cars? I know alot depends on tuning, but let's just assume that all three cars are tuned well...

Can someone post a dyno chart of a T66??? This might help me to visualize this

Thanks,

Alan

Yogi, I am sure you are right, but the average set up, with average tuning, and no fuel enrichment would be quite a bit lower don't you think?
I have only seen dynos on the 1.00, and the 1.15 Q trims, both were in the 500rwhp range at ~25psi. I would love to see some others if they are available(here I go again:) ).Crispeed, what would you say is "reasonable" ? Which would you guys choose for a road race car, a GT3540 with a divided T4 1.00, or a T66 1.00 Q trim ? Thanks for sharing your expertise, Carl

Ball bearing T66s are availible at a premium

Any insight on my last post???

Haltec tends to indicate a good plan, assuming the tuner knew what he was doing that's a good set up. You said upgraded fuel "pumps" does that mean two? as for injectors I would say 720-850 primaries, with 1600 secondaries, so ask the seller. An upgraded ignition will be a must for the boost range a T66 likes. Find out who tuned the car, and see if you can call them, or at least post the name, and the FL guys can chime in. Pictures would also help, is it a ghetto job, or is it clean? Whos car is it, if it's that built, someone likely knows the car, and its history.
The dyno that I have of a T66 @25psi is a 5th gear pull, so boost is high, but response is slow(in terms of time) The owner stated he got 15psi at 3200rpms. That dyno was 497rwhp@25psi. you can look at Wargasms (i think it's his, someone correct me)dyno comparo to see some T66 dynos, but they are all in the 400rwhp range(to my earlier point). Keep in mind the fellows responding on this thread are the kings, they make substantially more power than most with a given turbo. Overall, on the face of it, it sounds very nice, post on the regional forum, and try to get some history, if it's very nice, don't wait too long or you'll lose it.
Carl

Carl,
It is running upgraded ignition. The setup has never really been used. The engine only has 300 miles on it, adn the turbo is new; therefore, the turbo has never even been "wound up" that I know of. Roughly, how will this compare to the other two FDs that I've driven. (One bone stock, the other with many modifications (upgraded twins, FMIC, Apexi PFC, etc.) but needed a tune up.) How will the cars compare overall?

Thanks,

Alan

It will blow away the stocker, as for upgraded twins , that could be up to 425rwhp, but assuming an average of 325-350rwhp, the T66 properly tuned would be even for several hundred feet, then SEE YA........... No comparison. This is assuming a properly sized like a 1.00 q trim. It's mid 12s vs mid to low 11s, no comparison. Of course 11s require one heck of a driver, and the proper suspension. I mention the 1/4 only because that is an easy distance to visualize if you've ever been to the track. I'm sure I'll be flamed for my #s, but they are just guestimates ;) Also the Haltec puts ALOT of power under the curve properly tuned, this will make up for what would otherwise be a slightly slower spooling turbo.

See if this works ......... here is a dyno of my engine on 18PSI from last year in Australian Hp so it reading lower than it would in the USA aka dyno jet Hp.

http://autos.groups.yahoo.com/group/.../message/33331

click the atachment

See if this works ......... here is a dyno of my engine from last year, it is in Australian Hp so it is reading lower than it would in the USA aka dynojet Hp. According to my calculations on 18PSI it is pumping out roughly 500RWHP(dynojet) Power curve will also be affected by your porting too.

http://autos.groups.yahoo.com/group/.../message/33331

click the atachment

(sorry got done by the new editing rules)

Yogi, I can't see it. Even when I login to Yahoo, it says that I'm not a member of RotaryAus. Could you just host it somewhere else. Or just use the <IMG> tags and put it into the post?

pianoprodigy .............. send me an email at yogithebear@hotmail and I will email you back the dyno printout as I can't host anything at the moment ....... sorry :(

Yogi, if you don't mind, cbyck@attbi.com for pics. For my road race car, would you choose the 1.00, or the 1.15 q trim? Thanks, I know you sent me this direction in October, I am just a little slow ;)

Yogi, I sent you that email. What pics Carl?

I meant dynos

I'll post the dynos on my T-66 setup as soon as I get them. I pick the car up Friday. The picture below is a T-66, but it's David Marvel's (Marvelspeed). He used it as a template for my manifold while waiting for mine to come in from Turbonetics. I got the dual ceramic ballbearing with water injection...all polished (they all come polished now) with ceramic coating on the exhaust side.

I'm running the Haltech E6K, custom fuel rail with 1600cc secondaries, Aggressive steet port (Don Marvel's secret recipe) and a Supra fuel pump. Don speculates easy 600 RWHP at around 20psi. Not that I plan on running that much boost. We'll see what the dyno says.

No idea what spool-up will be, but given the dual ceramic bbs. I'd venture to say pretty quick. Once again, we'll see.

In the mean time, here's a shot of the engine =from a couple weeks ago.

https://www.rx7club.com/forum/attach...postid=1822589

What are the specs on both of the T66s? Q trim? AR? Divided? Thank you for your time, Carl Byck

Now, having seen Yogis dyno, it is almost identical to other T66Qtrim 1.00 dynos I have seen, Three in all, all 500rwhp. Very nice, I will be trying this next. For now my "indestructible" 97 Supra TT is having some problems, hopefully it's the turbos, and I'll "have to" go single........Carl

My T-66 is P-Trim with .96 AR. It's open, not divided.

Three of us went out to play
 

...a few nights ago. Freddie runs parallel w/ E6K (313 RWHP), Art is a T-04S and remapped ECU, and I w/ T66 P-trim w/ PFC (402 RWHP). Freddie destroyed Art and I off the line and jumps out fast to a bit of a lead. The T66 is explosive up high. I don't think the T66 is the way to go for anything but the track.

Three of us went out to play
 

...a few nights ago. Freddie runs parallel w/ E6K (313 RWHP), Art is a T-04S and remapped ECU, and I w/ T66 P-trim w/ PFC (402 RWHP). Freddie destroyed Art and I off the line and jumps out fast to a bit of a lead. The T66 is explosive up high. I don't think the T66 is the way to good for anything but the track.

mark57, What size ar? Is your motor ported? What manifold? Divided mani, and turbo? Upgraded ignition? I assume the TO4S was something like a .70 cold side, with a 1.15 hot? Has Art dynoed his? Thanks, Carl Byck

I'l be dynoing a .70 divided T-66 on a stock port next week just for shits and giggles

I got the turbo, manifold, Racegate from South Florida Performance. I never received a compressor map w/ it and I don't know the a/r.....I know I suck at the moment, but I've tried to get the information and they aren't being too cooperative ....
Manifold / hot-side housing not divided, stock port, JE RotaryPac firing a pair of Crane LX90 coils, NGK 10.5 plugs.

I'm supposed to pick up the car tomorrow! I still have to break her in for another 700 miles...So it will be a few weeks 'til I really feel the power. It looks so freaking good though. I'll post pics Monday night (assuming my mechanic gets done with it so I can take it home and wash it)

Well, I am buying a turbonetics .81 Q trim T66, can't pass on a great deal deal, Probably end up switching to a 1.00ar divided, but we will see. Car is still getting the widebody conversion, between the 335s out back, and the T66 I should be able to break my axles in a hurry:)

T66 .81 Q trim dyno, this is going on my Supra first, then when I finish the body on the & look out :)http://www.supraforums.com/attachmen...postid=1084857

i have the garrett T66 on my car with a 1.32 p trim rear and it makes positive manafold pressure at 2000rpm in 5th gear, ready to boost away hard at about 3000,

i have a lot of wastegate creep that is making it boost slow as well, once i get the electronic controller on there it will be much better

Piano,
You cannot use the T#'s or compressor wheel description to determine if one lags more than the other. If you are concerned about lag, then you need to pay attention to the turbine area to radius ratio. The smaller the number, the less lag you should see.

A T66 turbo is a very nice one. You could pay an extra $300 or so to get a bigger turbine housing that's divided. It'll provide more top end power, but at the cost of lag. I don't see lag being an issue on any single unless it's a huge turbine housing/turbo.

As Carl mentioned in a previous postt, check the other components of the car. The turbo is nice, but the EMS and fuel set-up are more important because you can easily blow up the new motor if it's not tuned right. That's probably why there is a new motor in the car right now.

Carl,
Where have you seen a GT35/40 with a divided T4 flange? I'd be interested in a turbine housing as such since I had to customize my exhaust manifold for the typical T3 turbine that comes on the Garrett GT30's turbine housings.

T66 with 0.70 turbine housing sounds like the beginning of a great auto-x configuration.

J

umm isnt the greddy t78 a hybrid mitsubishi turbo with a tdo7 compressor and a tdo8 turbine?

The 35/40 with a T4 is a custom setup that I have been talking with Carl about getting. It'll be ~$300 to get a custom machined T4 housing to mate with a 35/40 CHRA. The options were 1.0, 1.15 and 1.32 divided.

-Chris

I thought I'd let you field that one chris. As you now know, I have gone 666 on you:) For 800.00 I could not pass it up w/4000 miles, polished etc. I just sent the car into the body shop to finish up the widebody. Talk to you soon, Carl

Yeah, I saw that ;) That's totally cool. Seems like an awesome turbo, just maybe not what I want for a vehicle which is, realistically, street only. Funny thing is, all the searching and hunting and pecking, and we may both end up with "regular run of the mill" turbonetics turbos. HA ha!

Glad to see you made a decision. I'd be curious to see the dyno graphs that you have along with the pertinent specs of those T66's, who knows. Maybe that compressor with a smaller divided housing and I'll get the spool I want!

-Chris

I think that the .81 q trim will spool like crazy, I just don't know if I'll want to take it off the Supra, something about the ability to generate 750rwhp, and 650ftlbs of torque at 4500rpm may prove addictive, OH WELL, I'll just have to try :) http://www.supraforums.com/attachme...&postid=1084857