4AGE Turbo sizing

[wattsys86]

hello,

i was wondering if anyone could help me with choosing the right sized turbo for my 4AGE. it needs to run 14 to 16 PSI, cos thats wat the engine is built to support. any advice would be much appreciated :jdmsmile:

[reecegze]

Theres alot of info on turbo 4's here .. I would recommend t25g t28, tdo4l, ct26 or even stock t3 r33 turbo. Check out hypergears turbos if your after budget and reliablilty.
Ive got a good condition t28 bb that i am wanting to sell , let me no if your interested after 300ono

[44GTE]

Hi

I am running a HKS 2530 on mine and works a treat down low from aroud 3300 and pulls hard still at the top end.
Put out 172RWKW at 16psi but was limited due to shit pipe work and kept poping off a hose.

cheers

[R&D Mechanical]

You should see the compressor map with a T25, belive it or not its too big lols surges alot

[lloydious86]

t28 bb is on my 4agte runs 16psi and made 260hp atw for drift application , minimal lag and doesnt run out of puff just keeps boosting right up to 8,500rpm there common for parts/rebuild also

[Sam-Q]

By the sounds of it the S15 BB T28 is the most commonly used turbo for 4a engines. I have yet to hear anything bad about the combination

[wattsys86]

cheers for all the advice, i was thinkin s15 turbo but i wasnt to sure if it would reliably run the boost im looking to run. ppl kept telling me different things lol

[DX20VT]

By the sounds of it the S15 BB T28 is the most commonly used turbo for 4a engines. I have yet to hear anything bad about the combination

That would be a good turbo to use,
I used to run the non-BB S15 T28,
but was also looking at an Mitsi EVO 3 Type turbo also as an option.

[Sam-Q]

so some of the S15's came with twin ball bearing centers and some didn't? how did that work out for you anyway?

I was going to run a TD-05 off an evo I don't know if it was off a type 3 though

[Touge Boy]

I was of the understanding EVO turbos ran a .43 rear housing and were all T3 pattern?

[DX20VT]

so some of the S15's came with twin ball bearing centers and some didn't? how did that work out for you anyway?



Some of the jap spec ones we got here did.
Wroked well, but I ended up putting GTiR Exh wheel in the S15 housing and all sorts of other stuff which in the end made it better,
but $$$ for HP, was probably not worth it and should have just stuck with std spec turbo's.

[xero]

vf22/32 or whatever the fuck the STi turbo is, spools like a muther fucker, and good for 16+ PSI, also is slightly smaller than a t28 and comes with steel wheels and ball bearing core.

a couple of mates ran the td04l on their FWD corolla's and was making 250fwhp, and was on boost at 1800rpm and full boost by 2500rpm, but ran out of puff at about 6000rpm but still had another 1500-2000rpm before redline.

on ghaids thing about them is the V-flange instead of T3 flange.

[orange32]

has anyone tried a gtr turbo?

Stock ones are timebombs, but the r34 N1 has steel wheels. I believe they have a .63 rear housing, would probably be laggier than an s15 bb.

There is an almost new pair of r34 n1's for sale for $1350 which would be cheap for two people going halves.

[xero]

they are similar to the RB25 neo turbo's except in twin form... there was something that made them ultra ghaids when working as a single turbo instead of as a pair... cant remember what it is though...

[Frak]

has anyone tried a gtr turbo?

Stock ones are timebombs, but the r34 N1 has steel wheels. I believe they have a .63 rear housing, would probably be laggier than an s15 bb.

There is an almost new pair of r34 n1's for sale for $1350 which would be cheap for two people going halves.

A GTR turbo is NOTHING like an RB25 turbo.


Becareful when using a GTR turbo(non N1) as the turbine entrance is smaller and the internal waste gate is also smaller than a normal T25/T28.

It will come on boost quite nicely, then will run away, and the wastegate won't be able to flow enough. If you do decide to use a GTR turbo, changing the turbine housing will alleviate this. I went through all of this YEARS ago, what seemed attractive at the time wasn't. In the end I bought a GT28RS with 0.63 turbine housing.

[jaz_ae86]

now to add some photo's to point out how small the GTR wategate is:

http://img148.imageshack.us/img148/9507/gtrvt25exhhousing.jpg (http://img148.imageshack.us/i/gtrvt25exhhousing.jpg/)

Both are .48 exh housing

[Frak]

Jason can you take a shot of the entrance to both turbines to show the difference also?

[Juturna]

3037? :)

[jaz_ae86]

http://img685.imageshack.us/img685/6158/gtrvt25exhentry.jpg (http://img685.imageshack.us/i/gtrvt25exhentry.jpg/)

Best image I have of entry as I cannot find the GTR exducer housing.

But you can clearly see that the GTR entry is ALOT smaller as Frak suggests.

This is way I put T25 exh housing on T28 GTR turbo (and is for sale). All the benefits of both turbos.

[boost+k]

you'll max out the compresser side of a t25/t28 with about 200-220kw atw, so you only really need to match up the hot side to pick the turbo, the s14/s15 t28 run a .64 hot side, which IMO is too big for a 4age but can deff be made to work with tuning, on my friends 4age ke30 we used one of the rb26dett turbo's which had a .48 rear, then put into a t25 housing from a ca18 i think, it spools hard

the gtir has a 0.86? exchast wheel, so laggy but will flow more up top

[--Redwork--]

3037? :)

BaaaHaHaHaHa..... ROFL..... That'd be soooo AWESOME...










If you like waiting till 6000rpm for boost..

[wattsys86]

so an s15 t28 is the way to go i gather, but how much boost can u run efficiently with one? cos i dont wanna blow it up lol

[Nic19]

well im buying a gt2860rs with the .64 rear housing in the next couple of weeks so i will let you know how it goes.

[gaz20v]

got a kkr300 on mine, will let you know how it goes next week when its finished and running... most people hate on the kkr jobs but i thought id give it a go. Was cheap and the specs seem alright. Has .64 rear with same comp as kkr330 which seem to be popular on sr20's (330's have 0.86 rear).. figured the smaller rear would suit the 4age, could be wrong tho, trial and error ay, will report back.

[R&D Mechanical]

so an s15 t28 is the way to go i gather, but how much boost can u run efficiently with one? cos i dont wanna blow it up lol

not really they are too big for the little 1.6 but it seems to work, been told 20 psi all day will be fine lol should do a mean skid

[wattsys86]

cheers for all the help

[jaz_ae86]

not really they are too big for the little 1.6 but it seems to work, been told 20 psi all day will be fine lol should do a mean skid

Can I ask based on what is an S15 T28 too big for a 4A?

[Frak]

Can I ask based on what is an S15 T28 too big for a 4A?

Based on the technical knowledge of the internet ;)

[jaz_ae86]

JDM S14bb turbo results on 4AG motor:

http://img687.imageshack.us/img687/7234/comparisonq.jpg (http://img687.imageshack.us/i/comparisonq.jpg/)

Each vertical line represents approx 200rpm on graph, I have tried to line up the major lines.

Boost starts by 2500rpm
7PSi (wastegate pressure) by 3600rpm
Then the motor produces more air than the standard wastegate can control and I get boost creep from here on.

On boost by 3600 I don't call laggy on a motor that is not making power by this stage naturally asperated.

[R&D Mechanical]

do you know how to read a commpresser map?

[Frak]

do you know how to read a commpresser map?


When you do forced induction we go through that.:sunnies:

[Tim.duncan]

can i come along?

[R&D Mechanical]

When you do forced induction we go through that.:sunnies:

already done it i know how to read it too biggggg

[Juturna]

BaaaHaHaHaHa..... ROFL..... That'd be soooo AWESOME...










If you like waiting till 6000rpm for boost..

:S mine hits @ 4000..... then smashes limiter at 8800..... loves it.

[--Redwork--]

:S mine hits @ 4000..... then smashes limiter at 8800..... loves it.

Its obviously not a 3037 aka 3076 cause you unlikey to get one of those to hit full boost at 4000 even on a 2L... Granted if it was a 52 trim twin scroll it might make it alittle earlier but your still not gunna be all in at 4k on a 1.6..