[castro]

Ok so I've started doin a conversion on my sj51t the modification are as follows,
-series3 gti motor with H beam rods, vitara pistons, gti crank, variable timing gears, stock head and cams , high mount turbo manifold fabricated out a but weld bends, undecided on what turbo I'm goin to run ATM I have a few to choose from but am leaning towards a gt2560rs the up grade for rb26dett or gt2556r stock rb26dett Also under sided on what exhaust to run either a 3" straight thru or 2.5" straight thru with screamer pipe.
-Factory ba-bf xr6 turbo intercooler with custom tank and 2.25" stainless piping.
Daihatsu cherade air box with k&m filter and 2.25 stainless snorkel
- vitara power steering with Ben t adapter kit thanks to Ben t
Still a lot more to list but that's a start and once I know how to up load photos ill update

[WestVic-Zook]

what size injectors and ecu you going to use?

as for exhaust go straight through 3" if you can

just remember the motor is only a 1.3 litre compared with a 2.6Litre of a rb26, so maybe something off a SR20 or RB20 would be more suited, just remember its going in a zook so you will want it boosting early and not laggy till 3500rpm if you get my drift

I'm planning on building up a new turbo engine for mine next year so will be interested in seeing how this goes

[castro]

I have series3 injectors which should be ok at this point I haven't been able to find too much on larger injectors for them as yet. The ecu is an adaptronic that was about $1000.

Yeh I understand the problem with the capacity of the rb26 but I'm using one turbo from a twin turbo set up so it's only a 1.3 ltr capacity that the turbo is made for. I also own a sr20 and have looked at turbo sizes from this and a ca18. The best thing about using the rb26 turbos is they get sold as a pair so you buy a for up to 300$ then buy a kit for them for 200$ and you have 2 new turbos for 500$ and you have a spare.

Are you running a turbo gti currently westvic-zook?

[Trypt]

would be ridiculously fun to drive.

4wd burnouts anyone?

[mnemonix]

There are dozens of options for GTI injectors if you're running an adaptronic.
I've used VR4 (450cc) and currently run RX7 (550cc) injectors in mine. You'll never need to go bigger than that.

[atari4x4]

i wouldn't bother with a screamer pipe, leave that shit for boost cruising.... would be pretty dangerous boosting it in dry grass & have the gate open & spew fire/hot exhaust onto the ground with out some sort of spark arrester.

IMO you'd be better off running it back into the exhaust.

[mnemonix]

^^ This. ^^ Screamer pipes are for drift king wankers.
The 3" straight through exhaust is also probably overkill for a turbo 1.3 offroad. It will make more power than something more restrictive, but the trade off will be excess noise. You'll have ample ponies once boosted so why not sacrifice a could for the benefit of your ears?

[castro]

Yeh I've talked to a few people about what I'm doin and 90% love the idea of the screamer pipe but they all said the same thing 3" way too big. I will gain more torque if I run a 2.5 or 2.25 dump pipe with an external waste gate like a screamer but recirculated it back into the bump pipe about 200mm down from the flange. So what I have come up with it a 2.25 with an external waste gate on the dump pipe into a 2.5 exhaust system I will be running a cat and a muffler in there some where if needed.

[Fatzook]

2.5" will be PLENTY!!

[sleeperzook]

Since I sold my zook Ive frequented this forum, cos it has THE best community (and maybe boobs thread ) bar none. That said I've kept pretty quiet....till now. What else could pull my from the shadows but a boosted zook thread

I agree with the exhaust size. 2.5" is ample. Too big and you will have zero low down torque due to a lack of 'scavenge' effect on your turbo.

I ran an IHI RHB5 (mazda 2L) and then a TD04L (rex) turbo on my GTi set up. I found when I upgraded to CA18 injectors (380 from memory) they had a strange spray pattern and gave me issues with idle and car park manners. A rising rate pressure reg on stock injectors was fine on 10PSI and a bosch 040 pump. Plenty of injector duty left over spare @ 100rwKw.

I also did the adjustable cam gears, to try dial out some of the cam cross over and gain bottom end torque. You have to remember the GTi was designed to be a little revver, so cam lobe separation isnt exactly suited to boost. I found dialing them out a little made next to no difference on the dyno in the bottom end. On the other side I'm pretty sure my 2" cooler pipes were a little asthmatic past around 6500RPM, as the boost would fall off .5-1.5PSI in the manifold, indicating I/C or pipe restriction. Given the cooler was an RX cooler with custom tanks I doubt that was my restriction. So if you plan to run bigger boost, I'd concentrate on trying to fit 2.25-2.5" cooler pipes over 3" exhaust.

This said it was still a little rocket and fantastic in the sand. Depending on your motivation for the conversion, if like me your find the zook lacks some pep, I'd definitely recommend t/case gears. Without a doubt the single best thing i did. The turbo was definitely cool, however pointless unless you drive a lot of sand like myself.

Remember turbo=heat. I ran a BIG B&M cooler, -10 lines and ULX110 oil, because it was the ONLY oil I could find that wouldnt shear within 500km. I even had to fit discrete bonnet vents to help with under bonnet temps.

Ignition is another point you cant skimp on. If you have no timing control it will be one of 2 things, an under performing dog with locked timing or a highly strung donk bound to lunch itself.

I also toasted a stock clutch with the N/A GTi before boost, so make sure you look wider than the snail and screamer pipe.

Just my 2c from my R&D. Have fun with it and remember it didnt happen if theres no pics

[oozuk]

I have 3 inch dump on my turbo and then it steps down to 2.5 inch under the car.

as exhaust gasses cool on the way out they condense and loose gas velocity, stepping down the size of the pipe keeps the up the exhaust gas velocity and promotes torque...

well it made sense when it was explained to me.

[Santos]

If you are serious about boosting a gti engine for the sierra then jump on redlinegti.com, probably the most experienced people when it comes to turbo dohc g13's

[d1mitch]

oozuk wrote:

I have 3 inch dump on my turbo and then it steps down to 2.5 inch under the car.

as exhaust gasses cool on the way out they condense and loose gas velocity, stepping down the size of the pipe keeps the up the exhaust gas velocity and promotes torque...

well it made sense when it was explained to me.

yep thats pretty much the basics of it. your turbo most likely had a 3 inch exhaust outlet which would makes sense for that decision aswell


also castro you do know the wastegate goes on the manifold not the dump pipe. the later you can rejoin the wastegate pipe down the exhaust the better as it will cause less turbulence whent he air rejoins the flow thus a more free flowing exhaust. definitely no screamer, on a 4wd they are the most annoying things ever

[hass]

how did you go with this Castro?

I am in the middle of putting a Garrett GT17 setup on my trailer zook and should have it finished in the next couple of weeks if life doesnt get in the way...
I'll be running a GARNDI Chipped ECU with 8PSI boost to be on the safe side with my stock engine. 2.5 Intercooler piping and a 2.5" straight through exhaust...

[castro]

Yeh I haven't really been doin too much on the project as ive been busy with other commitments but ill upload some photos of the progress. I'm now mainly waiting on parts from lowrange offroad to complete it now.

[zook_ute]

I run a garrett ball bearing t28 on my 1.6, it is very responsive starts boosting around 2200rpm, full boost at 4000rpm.

These turbos are easily sourced, and cheap. Same turbo as a jap spec s15

[hass]

Hey Guys,

Thought I would update people - My turbo G13B engine is now complete


Check out this video of how it went:



FYI - This thing surpassed all my expectations!!! (not to mention sounds freaking awesome!!!!!)
In 2wd, it would spin all the way through the gears into 4th! Thoroughly recommend it for anyone who is interested!

In the near future I plan to have turbo chips available for stock ECU's to run 10PSI boost and increase the rev limiter, so PM me if you would be interested!

[biff10]

Sounds so fun

[superduki]

hass wrote:

In the near future I plan to have turbo chips available for stock ECU's to run 10PSI boost and increase the rev limiter, so PM me if you would be interested!

If that's Garndi's chip that Gtaye stocks on redline, the turbo chip doesn't increase the limiter, but the N/A chip does. I can't see any benefit of adding an extra 1000rpm that far up the rev range. The turbo (especially a T28 like your running) would be well out of it's efficiency range.

I run a T28 on a mk2 GTi as my daily and they are well suited to them

Cheers, Superduki.

[Gwagensteve]

Maybe I'm missing the point but in the video all the turbo looked to be doing was making the power harder to modulate and the car harder to drive. (and a track where the power wasn't making any difference to capability.)

I like the idea, but for the 10% of times you need an extra 80hp off road, it seems like a lot of compromise and work.

Steve.

[drakan69]

I like it. more video's man, especially vids in sand

[SierraDan]

Sounds just like Rhetts micro , just less RPM, nitrous and flames

[Ricecutter]

Nice, am thinking of heading this way. Though I do share similar concerns with the peaky aspects, I'm wondering if a hand throttle would help. An update and any further thoughts would be interesting. cheers!

[Santos]

Gwagensteve wrote:

Maybe I'm missing the point but in the video all the turbo looked to be doing was making the power harder to modulate and the car harder to drive. (and a track where the power wasn't making any difference to capability.)

I like the idea, but for the 10% of times you need an extra 80hp off road, it seems like a lot of compromise and work.

Steve.

I'd say thats more of a tuning issue rather than the turbo itself per say. IMHO Matching its boost etc to the appropriate point of the rev range would be everything. That and instead of going for max power with a huge turbo take the 'diesel' route and have a small one spool up and hold a low consistant pressure. You could build a peaky NA g16b and still have the same problem.

Is not a house of cards just a jigsaw puzzle with a few pieces need replacing from their current spot.

[Gwagensteve]

I completely agree Santos, but generally, small turbos used to fill out the torque curve aren't anywhere near hektik enough.

Rhett's car is a good example of using a small motor on a relatively heavy car with LOADS of traction. In that application, lots of HP is required to overcome traction ( in order to make wheel speed, as an example) so despite all the noise and hektikness, it's drivable - because the car can load the motor up. Putting lots of boosted HP into a car with little traction doesn't make the car better IMHO.

Steve.

[masterA]

What turbo did you end up getting?