DOHC turbo sizing

[brian89gp]

Don't you just hate overlooking the obvious? (thanks for jerking me back into reality nocutt ) Spent the last 2 hours trying to figure out the GN turbo's and it appears that with the same stock crossover/downpipe flanges they go from stock to 700hp. Not bad for bolt in...

Now all I got to do is figure out the specs on the stock turbo.

[Guest]

Here you go Brian. I would call these guys to make suer you know waht you are getting but this is a killer deal

T04B 62-1 Its better then a 60-1. Will flow gobs of air.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2458686948&category=33742

Also here is a 60-1 with a small a/r of .48. Not sure if you want something that small but remember its a TO4B so it a .48 might be bigger then a larger a/r T3 exh housing.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2458686631&category=33742

Just call and ask on the exh housing.

Either way those are damn good deals. Even the Buy it now price.

[nocutt]

Don't you just hate overlooking the obvious? (thanks for jerking me back into reality nocutt ) Spent the last 2 hours trying to figure out the GN turbo's and it appears that with the same stock crossover/downpipe flanges they go from stock to 700hp. Not bad for bolt in...

Now all I got to do is figure out the specs on the stock turbo.

LOL!! More doses of reality, you don't have to spend a million dollars for used ...ish, anywayz just go over this just for more insight on what you wish to do...ultimately it will depend on money vs what you "really" want to do...DO NOT GO BELOW A .63 A/R on the hotside...the DOHC wants to breathe...

http://www.gnttype.org/techarea/turbo/turbowheels.html

http://www.gnttype.org/techarea/pictureguides/turboguide/turboguide.html

Also I have forgotten the specs for the GN turbo, I know the A/R for hot & cold side is .63 & .60 respectively as for the trims, or ind/exd...cannot remember, give John Craig or his company a call, they have all the info you need on upgrades...or at least where you need to be!?!?
Limit Engineering
(92 453-7321

[Guest]

Here we go!!!!

Email and find what the reserve is

couldnt' hurt

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2460359748&category=33742

60-1 Hi-fi.

[timg]

I'm running a T04E "60"trim turbo with an on-center 0.7 a/r exhaust housing. It was $550 new from a Turbonetics dealer. It fully spools by 3500 rpm without a boost controller and by 3000 rpm with one. Boost begins at 2500 and is quite usable by 3000 rpm without a boost controller. This was with drastically wrong cam timing at 5000+ feet. I haven't driven it since my cam timing was fixed so I'm not sure how it would respond. I've also never driven it at sea level.

Tim

[brian89gp]

Oh well, such is life. I have to admit that it is interesting to be in boost the second I hit the throttle, at any load and any gear.

Anyway, I have a GN turbo in the mail here pretty soon that i'll use to re-weld everything and probably end up using for a short while while i hunt for a reasonably priced larger one (also see what stock can do ). I wish I could drop the money on a new Garett turbo but I just can't; after realizing how much I would be spending I had to knock myself up side the head.

Tim, thanks again for the recommendation, I just don't want to use the 60 E wheel. I got a quote for a 60-1 or 62-1 compressor, whatever hot side combo I wanted for around 600-650. I just really need to watch what I am spending now.

Shaun, thanks for the links. Back to a previous post, yes I do have a stock CT26 compressor wheel that I used for comparisons. Its been a while but I think it matched either a 54 or 57 T04E wheel.

[Mitch DOHC]

like how much would i be looking to spend if i wanted to turbo my 94 DOHC

[timg]

the 60-1 is an awesome match. I'm just wanted to share what I used. The 60-1 and "60" trim T04E are almost identical as far as compressor maps go when data points for the 3.4 are plotted. I have an excel spreadsheet comparing the two for anybody interested. The "60" trim is available with either 2.75 or 3" inlets and 2" outlets on the intake. The 60-1 is 4" inlet and 2.5" outlet. The T04E oncenter exhaust housing is HUGE and setup for a 3" V-band- $$$.

I should have said more about lag earlier. If I'm out of boost, it takes 1-2 seconds to fully spool during which time the transmission is usually downshifting. For some reason, my car seemed to have 'lag' before I ever put the turbo on. Driving around, it'll get up to 5 psi as low as 2500 rpm if I'm cruising with a boost controller. Accelerating it gets 2-3 psi by 3000 rpm and full boost(whatever it is) by 3500 rpm. When shifting, it never drops out of boost. On an auto, the turbo is ideal for drag racing. The tires spin off the line and by the time they have a chance to hook up, the turbo is already spooled and it never comes out of boost. For an autocrosser, the turbo is probably too big. The lag time would be unacceptable. A ball bearing center section would probably help, but I'd guess that a lot of it is the sheer mass and diameter of the impellers. A GT35R is probably perfect for somebody interested in autocrossing.

I spent about $3k to turbo my monte with awesome deals on both parts and labor. If a shop can do it that cheaply I'd be suprised. If you do it yourself, $2500-$3000 is reasonable for new parts and only about $500-$1000 of external labor. If you have somebody else do it, plan to spend $4500 at a minimum and $5500 at a maximum. More than that and you're getting ripped off. Keep in mind that if you use an internal wastegate, used-rebuilt turbo, and no intercooler you could do this for up to $1500 less than I listed above.

Tim

[brian89gp]

2000 is a good number, if you pinch 1500 can be done. 3000+ if you like shiney name brand stuff.

What really costs is the intercooler, wastegate, BOV, turbo, and ECM/fuel management. You could easily drop 200 on a wasegate, 200 on a BOV, 300 on an intercooler, 1000 on a turbo, etc. Personally my $10 RX7 BOV is working just fine. Just have to decide what you want.

[Mitch DOHC]

what kind of power gains could i expect from say the 2000 doller setup

[timg]

As an example, here's what I spent on everything. The BOV was a cheap used one from a first gen Eclipse. The boost controller was one of the cheapest manual ones on the market. The intercooler was brand new and about 1/2 price off ebay. The turbo was about 1/2 retail from a Turbonetics dealer(RedZmonte can hook you up). Even the mini-AFC was a beta unit that I saved some $$ on. The labor was done primarily by Shane(redzmonte), me, a welder friend, and an exhaust shop guy. What can really add up is stainless flanges, silicone hose and adapters, oil feel and return lines, and similar stuff. It's all incredibly expensive.

Turbo 550
Wastegate 180
FMU 175
Piping 150
Gauges 150
Coating 100
Misc Plumbing 400
BOV 20
Intercooler 450
Boost Controller 65
Mini-AFC 135
Fuel Pump 115
Install 500
Total 2,990

Tim

[brian89gp]

http://www.brian89gp.com/misc/turbo%20flow%20maps/

Wanna compare? I'm kinda curuios to see yours and how far mine are off.

[timg]

Sure. I'll e-mail you what I have and try to upload the file to mymonte in the photo gallery if it'll let me. Those charts you did look great! I'd plotted them all by hand, but what you did looks MUCH nicer! What I did just listed flowrates for different RPM and PR and then the relative efficiency of each compressor.

Tim

[RedZMonte]

Happen to know the specs on a GN turbo?

.81 ar on the exhaust
.42 ar on the compressor
? trim.

These are directly off the GN turbo i have sitting in my garage. This i think is off an older GN. the newer ones i think where different.

not a good choice. T04E (straight T4 is going to be your best suited turbo for our motors) 60 P trim with a .68-.71 a/r

[timg]

Links to turbo DOHC pics

http://www.mymonte.com/forum/viewtopic.php?p=217213

Tim