Rb26 Borgwarner 8375

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hey guys ..

few weeks ago i asked for some help and got some good response from some ppl here. just wanted to show you guys my results..

so the set up is rather simple..

fuel :am using a aermotive stealth pump with some dw800cc injectors

ignition: stock

engine: arp head bolts , wiseco piston stock compression,extended sump and harden oil pump gears and stock everything else..

extra: am also using a aem water injection kit..actually just using filtered rain water to aid our crappy 91 ron fuel ...

management : haltech plug and play

tuned by me

15 psi :336trq & 414whp

21 psi :409trq & 499whp

from the dyno graph i thought this would been lagy ..but i was so wrong ....car pulls and spools just as good as my old precision 6262 bb .makes more power at same boost. at 11 psi with the old 6262 i was making around 340hp & with the 8375 11psi car made around 370hp both without water injection

honestly very impressed for a turbo i paid 580us for compared to the 6262 which cost 1200us..

and all of this was done with a single scroll 8375 and a ebay single scroll $140us manifold..... may be i got lucky with manifold but its just as strong as the one i paid 400us for before.have put countless abuse on it and no cracks yet.

dyno graph and vid

https://www.youtube.com/watch?v=VfhW7fvX-Bg

[Looney_Head]

nice results. i have a twin scroll 83/75 going on a built RB30 so cheers for posting your results

[GTR_JOEY]

No doubt they are an awesome turbo for the price, I would love to see a back to back against the precision. These things spool like a beast and there's plenty more in that turbo for you if you put the money in the right gear.

I've been running mine with the full race twin scroll manifold and made 560rw hp on ethenol with a 2.6. Made 500rwhp at 5500rpm

I've since upgraded the cams and valve train, cleaned up the head, raised compression, stroked to a 2.9 and ceramic coated the exhaust side .. Results should be up within the month

Old graph.. Rubbish photo but its 98 premium vs E85

Note the car made no more power past 50/50 ethenol/98

[crashsvg]

No doubt they are an awesome turbo for the price, I would love to see a back to back against the precision. These things spool like a beast and there's plenty more in that turbo for you if you put the money in the right gear.

I've been running mine with the full race twin scroll manifold and made 560rw hp on ethenol with a 2.6. Made 500rwhp at 5500rpm

I've since upgraded the cams and valve train, cleaned up the head, raised compression, stroked to a 2.9 and ceramic coated the exhaust side .. Results should be up within the month

Old graph.. Rubbish photo but its 98 premium vs E85

Note the car made no more power past 50/50 ethenol/98

yep they do spool super fast for journal bearing turbos..... i was really worried when i first compared it to a physical size of a 6262 .

as you can see in the vid the moto sits in a s15 silvia which is super light ...the weight difference of a r33 at 3400lbs and the s15 2700lbs makes this car feels like its almost at 650hp...

with some cams and cam gears i should be able to get power in a tad quicker and make a higher peak hp...

looking forward to seeing your updated build results...

[GTR_JOEY]

Do you have any results with the 6262 with your current set up?? Cam gears will make a big difference

If you dial them in for response

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yep... but the results with the 6262 would not be applicable to compare because it was done with out water injection ..so the timing when tuning was alot different .but the 6262 did make 415whp at 20 psi where as the 8375 made 499hp at the same boost... but the 6262 was only running on a .63 housing which would make high hp numbers on such a big moto difficult .

i had read some where a guy changed out his .82 ar 6262 for a .63 and the results were minimal difference on his rb26..but i cant confirm that........i know on a 2.0 honda moto moving from .63 to .82 makes no difference ..

only results i have with both turbo is at 11psi without water spraying either ways and the 8375 did make more power then....

[GTR_JOEY]

Ok thanks mate, would be good to see some more results on this turbo going around.. This night spark a bit more interest

Here is my thread on my results if you are interested

http://www.sau.com.au/forums/topic/414766-gtr-joeys-r32-gtr-e-flex-twinscroll-8375-results/

[joe89]

Hi.

What .ar do you have?

I think TwinScroll should make a big difference

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hey.. i used a .88ar back end because i was worried about lag as the turbo was non bb..

your dyno graph is a lil unfair comparison as the bigger ar back ends has 5psi difference .it may not look like much but once these turbo begin to spool the move from 7psi to 21psi in a heart beat... that may contribute to more power lower in the power band..

the twin scroll will help with spool up when combined with a twin manifold..

what moto are these graph from?

[joe89]

Well i wanna buy 83-75 for my stock RB26 for street use and i think i go for 91ar and ts manifold for better spool. What do you think?

First thought was 6262 84ar but i see on your example it is not worth

Graph

[GTR_JOEY]

Hi.

What .ar do you have?

I think TwinScroll should make a big difference

Mine is a .91 on a full race twin scroll

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imo its worth it over a 6262. when properly set up they would only make 10% difference in hp for half the price difference.

[silvianc]

Here is my graph on a 6262 by with .84 TS setup and 93 octane gas

611 at 19 psi

550 at 15 psi

I think if I had 9:1 Cr pistons my torque would've been a lot higher

I'm using JE 8:3:1 CR pistons and Tomei 264 cams.

Edited October 26, 2015 by silvianc