deciding on size and trim
 

what turbo and what trim would i need for a 3.8l engine that redlines at 6000rpm (tho it makes most power between 2500-5000rpm)
and it's automatic
i will be doing some reading but being as im thinking about mounting it "sts" style is there any compensation needed for the longer charge pipes and such
so should i run a bit to big of a turbo or a bit small?
the car is stock 205hp 230ft-lbs (about 160whp and 190wft-lbs im looking for 230-280whp witch i think would be about 310-330ft-lbs)
i don't know how much boost i should run but i was thinking about starting at 5psi and going to 8psi if needed

Re: deciding on size and trim
 

being as i am trying to turbo this car for on the cheap would this ebay ching chong meow meow
t04e suffice?
http://cgi.ebay.com/ebaymotors/T3-T4...mZ320297155799
it says it supports up to 350whp and 30psi of boost so i figure 230-280whp should not be to difficult with this size turbo?

Re: deciding on size and trim
 

fail.





look harder i got a GARRETT t04b off ebay for 60 bucks

Re: deciding on size and trim
 

....but it's got an anti-surge cover. :o :o :o :o :o :o :y :y :y :y :y

Re: deciding on size and trim
 

i know you guys don't like cdm turbo's but i figured i could do that to cheaply start boosting and then when i need more than 5-6psi get a good turbo
i think i have pretty moderate power goals on the zzp website they say that 450crank hp on a stock l36 with their $2700 bolt on "kit" is nothing
i just don't want to spend $2700 on a turbo for a car i paid $700 for
i think if i could keep to total price of the car and turbo tune and everything under $1500 i would be happy

Re: deciding on size and trim
 

5-6 psi is never enough... buy the right stuff the first time :y i thought the same thing about the low boost, somehow it made its way up into the 20's and somehow i got really good at walking :1

Re: deciding on size and trim
 

just goto a junk yard and turn it into a gtp

Re: deciding on size and trim
 

i would but im not a big fan of superchargers plus it's a pushrod engine so tonnes of torque on bottom and mlid power on top
a supercharger will just magnafy that (witch would be bad it already spins the tires on dry pavement at 15-20mph and 40-45mph in the rain, a supercharger with 5psi at 1500rpm i i would just spin but if i didn't hit full boost until about 1800-2000rpm i would already be moving and not have quite the traction issues i may be wrong but either way i want a turbo not supercharger tho i am thinking about going with gtp or dsm injectors because they stockers are only like 23# (i think thats like 380cc)

Re: deciding on size and trim
 

Re: deciding on size and trim
 

I had that same Egay Turbo it lasted three weeks then the bearings out.If you want to waste your money buy it.

Re: deciding on size and trim
 

sounds like you need some new tires, stock 3.8 w/ traction problems?............please


maybe you should spend some money on making it safe before turbo. a $700 GM prob needs another $700 in front end work.

Re: deciding on size and trim
 

I'd say T3/T4 (B or E cover) with a smallish turbine wheel if you're looking for quick spool and good power at low boost. 68 trim may be a little small turbine wise, but 76 trim would probably be close to ideal.

Re: deciding on size and trim
 

How about a Holset for uber cheap power that's reliable? :D A nice HX35 or HY35 might do nicely and support that camaro engine for even more boost later on.

Re: deciding on size and trim
 

thanks for the help i think i might start looking for a holset or a 76 (or close to) trim t3/t4
i might find a decent one on craigslist or look in the junkyard any ideas of what cars (or trucks) might have similar sized turbo stock that i can pull at the junk yard
if im not mistaking holsets are pretty common on diesel fords correct?

and yeah the car needs a couple things before i boost it such as a new map sensor (i think stock is 2bar would i need to upgrade to a 3 bar or 2.5bar??)
also it needs cv joints but im thinking about using the larger stronger ones off of a gtp


i have one stupid question is it a bad thing that the car uses both map and maf?

Re: deciding on size and trim
 

Remember that the 76 trim is the turbine side, and is 76 trim T3, not T4. If you get a 76 trim compressor you'll have one big turbo. I'd say 50-60 trim T4 compressor. Problem with Holsets is they have a giant turbine housing and turbine wheel that are mated to a mediocre compressor wheel. For instance, the HX35. Usually the hotsides are in the 9-16cm range and the turbine is T4 sized, and all that turbine and you only get a 60mm compressor inducer. Don't get me wrong, 60mm compressor is great sized for a street/strip car, but the oversized turbine aspects really take from the turbocharger's characteristics. You can get a t3/to4e with a 76 trim turbine and a 55-62mm compressor, so you get Holset compressor capabilities without the turbine wheel meant for a large diesel engine. The only thing Holset has going for them is 60mm compressor inducer for $200>, but IMO that's still not worth it unless you're on a major budget and then it's a viable option.

Re: deciding on size and trim
 

thanks i appriciate the help
any ideas on where to get a cheap t3to4e?
is there anything it came on stock that i could pull from a junkyard

Re: deciding on size and trim
 

T3/T4 isn't a stock turbo. There's T3 and T4 frame turbos. So any T3/T4 is a hybrid and not made by the factory. I guess I did have one turbo off a Diesel that had a stage 3 (dimensions) turbine and 57 trim compressor from the factory, but uber rare.

Re: deciding on size and trim
 

ok

Re: deciding on size and trim
 

a guy i know makes kits for that engine..
he uses a T04b P trim with a .64 AR with a T04E 57 trim compressor

www.cartuning.ca

im not suggesting you buy the kit... but that compo is infriggincredible

my set up for my 4.3 (similar to your 3800 in many ways)
t31 (dont know the wheel trim) .82 AR T04B H3 compressor
the T31 might be too small for over 5000 RPM but for my setup its perfect (for now lol)

Re: deciding on size and trim
 

thanks i will deffinately be looking closely at that site as i build my turbo setup
does anyone know what the stock engine can hold? (max power wise??)
i mean they made like 296whp and 400+wft-lbs but i don't know how long the engine will last making that much power and this is my daily driver
tho i have had the idea in the back of my head for about a minute to buy a 90-93 integra or like 89-92 civic and driving that while i turbo the intrigue and then when turboing that is done i could throw like a b16 in the honda and turbo making it a track car or a barely street legal track car (out of that i would like mid to low 11's but thats just an idea i have been tossing arround)

Re: deciding on size and trim
 

Hello, Yes we had a few local guys this summer who did the same project of boosting the 3.8 and they all went with different models of turbos. The one that gave the best results was a T31/T04E, (stage3 turbine) with the 60 trim comp wheel, it's the biggest one, which is actually the same size as the GT3076R wheel. (larger wheel can be custom fitted in the t04e)
Turbine A/R was 0.63 a/r and he's now running 0.82 a/r, laggier but squeezes out more hp on the top end.

Re: deciding on size and trim
 

im not to worried about lag because i would like to still be able to get like 30mpg on the highway
so i don't want boost below 2k plus i figure that a little lag would help it hook up from a dig

Re: deciding on size and trim
 

somebody mentioned a T31 machined for a P trim T04 turbine wheel
anybody try this or heard of it ?

Re: deciding on size and trim
 

Yes, you can do it but it starts to make sense especially with larger compressors such as 60-1 and gt3582.

you can very well bore out a T31 housing for a T4 P trim wheel, which is much like a stage 5 but the other T4 wheels are also interresting such as the N and O trim, because they give better low end response than a regular stage 3 wheel.
the T31 turbine heat shroud also needs replacement by a T4 one when doing so.