1G-GTE turbo comparisons, best options for HP aims

[trdee]

as posted elsewhere i saw 1 bar of boost at 4200rpm on an 8:1 bigport 4AGZE, should be a good combo for a 1G?

the borg warner EFR turbos are also worth checking out. got a mate with one and the performance is truly impressive.

[love ke70]

I have a garrett 3076r with 0.63 rear housing on stock 1g, custom plenum, microtech lt12s, 15 pounds boost has me making 225rwkw on ULP98

its a great turbo, i built mine for hill climb and gymkhana type stuff, its on full boost all day long in this application

next step for me would be to pull head off, better gasket, port, cams, dial custom cam gears etc, that would get up to a reliable 250rwkw and then e85 i would expect 300rwkw

but srsly... would i spend that king of money on a 1g

NAH

edit: first thing i did weas rip out the TVIS plate, also my twin scroll rear housing isn't split

This is great info as I have just ordered the 3076r with a .63 rear.


when do you get yours on boost mate?

I already have most of the dollar items, so building a tough motor is really just machining and time now, once I get a standard one in and running...feels like I am doing it all backwards

Thanks for the great info mate

EDIT: Did you notice much difference when removing the TVIS?

[love ke70]

Slipway, cheers for the heads up, If I come across any 1J gear I may have a look

Trdee, that was an option, but I am trying to avoid the tedium...Im a bad person I know, but this has all been done before lol if I wasnt so busy I would have liked to play with the maps, but unfortunately I just dont have the time at this stage. That is decent spool for a substantially smaller motor with low compression, I am probably going to build mine around the 9:1 mark, and with 272s it shoud be alright off boost I am hoping, very few people really have alot of info about the off boost or transitional boost. Pretty sure the 3076 should be responsive enough between gears it shouldnt lag

are you suggesting the borg warner could be better than the garrett?

cheers, Andy

[SillyCarS]

never had the TVIS on it

i have basically zero lag shifting gears with a 4.11:1 diff ratio



this is my map - obviously it could be better with a better ecu

i run a tial 38mm gate with 5 psi spring in it and manual boost tee, sard 600hp rising rate fuel reg

the guy who tuned it did a freaking amazing job to get the curve that linear and fuel ratios like that

[trdee]

are you suggesting the borg warner could be better than the garrett?

as much as i hate to say it, yes i do. harreh runs a borg warner EFR6258 and he is making 23psi at 3500rpm, again on a bigport 8:1 4AGZE. Not quite as much power potential as a GTX3071R, but it would still support 250-300kw and the boost response is simply retarded. it spools hard from 2000rpm, as soon as you even look at the throttle its on boost. the response is light years away from something like a bush bearing silvia turbo etc. My GTX3071R has very good response too, but still not like the EFR

the 3076 should run well enough. RONA is running a GTX3076R with an 0.86 housing on his 3SGTE and IIRC he was making full boost at around 5k with very good drivability (E85 helps a lot with off boost drivability too, you can throw so much more timing at it). The GTX models spool faster, but with your extra capacity and smaller rear housing the response should be quite good

[hypo23]

Im running the .8 something rear housing.

If you are around willow bank at the end of the month for jambo ill take you for a spin if you like.

This is great info as I have just ordered the 3076r with a .63 rear.


when do you get yours on boost mate?

I already have most of the dollar items, so building a tough motor is really just machining and time now, once I get a standard one in and running...feels like I am doing it all backwards

Thanks for the great info mate

EDIT: Did you notice much difference when removing the TVIS?

[love ke70]

mate, would love to, wanted to get out to Jambo anyway, me and the missus would love to be taken for a ride, please keep in touch and we will organise a meet up


trdee, I asked 6boost about the GTX and his opinion was that unless chasing lots and lots of boosts it was pointless. 5K on boost would shit me, but as you say, smaller rear housing should help.

If I had more time to investigate I would look into the borgy options, maybe in the future Thanks for the great info.

Cheers, Andy

[jonathan yee]

is that not half the reason for e85? to run lots of boost, well more than you would on 98pulp?

[love ke70]

Yes, but it should get to 300 very easily at 25 pound, Prob closer to 20, the gtx would only be needed over 35 apparently.
I run 33 on my ute to control egts but the little 1g won't like it or need it me thinks.

[trdee]

6boost is correct that the GTX is designed to be more efficient at higher boost levels, that's the main reason why I bought it - need to run lots of boost to get a 4A to make power, and the GTX3071R is at peak efficiency at 30psi

The GTX is still a better design overall, with the billet comp wheels and better designed blades etc, but not a massive enough difference to cry about. The GT3076R should still work very nicely on your setup. E85 means you will be able to throw more timing into it which will help with response and off boost power a lot too

[boxh34d]

It's not just high boost. According to the comp maps and a lot of reports I looked into when I was looking around, any GTX wheel will flow more air at the same boost compared to the GT version. Slightly larger in and ex probably has as much to do with it as anything like blade design. However, if your not operating at that part of the map, you'd never know.
For those running A, really high boost, and / or B, the end of the flow range of your current GT wheel, going GTX seems to make a significant difference. If your like a lot of the RB25 guys making 250kw at 15psi on a GT3076 and change to a GTX, then it seems to be not worth the effort

Also though, in a lot of cases, a GTX will come close to the next size up comp wheel in flow at the same boost. Ie, GTX3071 flowing pretty much the same air as a 76mm GT at 2PR. Good consideration for those with packaging constraints.

[trdee]

You pretty much hit the nail on the head boxh34d.

[Wishin86]

loveke70
have you done all your machining and stuff yet?
i will be looking into doing the same kind of stuff that you are doing. larger capacity, head work and probably a gtx2871-2876?
just wondering if you have got the pistons and camshafts etc yet?
if not, i would possibly be interested in getting in a buy with you.

[love ke70]

thanks boxhead and trdee

wishin86, cams I have but they need some repairing
I have rods but not sure I will use them
have been in talks with a couple of blokes about pistons and will probably organise this late this year or early next.
to do a group buy of pistons, bore size has to the same, and if the stroke is different, the piston will be the same and rod will be different or we will all have to run identical rods.

[love ke70]

OK, for those following this, and just for reference sake for future.
I spoke with specialised power porting,

I have sent the head down to be flow tested and possibly ported. That is the head off the HKS motor which is already ported, so this will see how good of a job they did.
manifold is being power ported with the TVIS plate and the aim will be to get even flow to all cylinders with the TVIS plate complete, so that I should maintain more bottom end by using the TVIS. This will also help to give the air a longer flow into the valve to let it stabilise.
plazmaman throttle body has been purchased and will be put on the manifold but brought away from the plenum further to achieve better flow, but not just peak flow but should help with torque as will get better air at lower speeds. At least thats the plan.

I will run the car and then consider getting the turbo power ported to see if it makes much difference, should be interesting to see if it does or not.


Cheers, Andy