GT2871 USERS. SR motor

[180sxqc]

Extrude-honed is all about material smootness aka better flow?

[EsChassisLove]

Much better flow.

[usdm180sx]

Would the s3 or s4 cams be a better match for the .86? I am considering the hks 264 step 2's but the jwt cams have such high reviews. But I don't know much about matching them to a turbo.

[codyace]

Originally Posted by 180sxqc

Extrude-honed is all about material smootness aka better flow?

Yup. Search through this thread I've put up plenty of pictures.

Originally Posted by usdm180sx

Would the s3 or s4 cams be a better match for the .86? I am considering the hks 264 step 2's but the jwt cams have such high reviews. But I don't know much about matching them to a turbo.

It's really a twofold answer (from me)

I think the S3 is the perfect match for the T2 flanged turbos on these engines, and that the S4 area just slightly more to the 'top end' of things, thus being better for the T3 and up turbos.

With that said, the S4 on paper would match the compressor housing well in regard to where it should make power, but the S3 better matches the exhaust housing and where it spools/generates torque.

With that all considered, I would still suggest the S3 cam instead of the S4, however the S4 will totally work well in these cars, and will still be better suited to a larger turbo if you ever go that way. S3 has more midrange, quicker spool, and great top end, S4 better top end, more peak power, little bit less torque. I'd personally just run the S3 cams, and use a g\reddy intake manifold. Best of both worlds.

[Patrick Bowering]

cody im looking to pick up some throttle response any suggestions? my setup is s3 cams isis intake mani tubular exhaust mani tial v band housing on gt2871 .64 ar. greddy fmic.
I will be switching to a pbm high mount or something like the same idea and i will be switching to bosch ev14 injectors not that it matters. i have a q 45 tb but is there a point with 2.5 inch intercooler piping?

[TFD]

Something different.

What volt values (z32 maf) and dutycycle (nismo 740) do you guys see at peakpower?

I'm just guestimating mine since being bored haha.

I've got 4.54 V and 73% at 20psi @ 7250 rpm. 350 whp area I reckon.

[codyace]

Originally Posted by Patrick Bowering

cody im looking to pick up some throttle response any suggestions? my setup is s3 cams isis intake mani tubular exhaust mani tial v band housing on gt2871 .64 ar. greddy fmic.
I will be switching to a pbm high mount or something like the same idea and i will be switching to bosch ev14 injectors not that it matters. i have a q 45 tb but is there a point with 2.5 inch intercooler piping?

Q45 with 2.5 pipework is pretty overkill. My car is 2.75 to the 80mm Tomeit unit and that's about as big as I'd go, as that required me to port out the greddy manifold to make it smooth/all one piece.

The only thing to improve spool would be to use a stock exhaust manifold on that setup, and or (obviously) timing and E85/race fuel. Pump gas wise there isn't much aside from the normal port matching/minor headwork etc etc.

FWIW: In order to use those injectors you're going to need to find a way to secure the intake manifold rubber gromets like I did:

Originally Posted by TFD

Something different.

What volt values (z32 maf) and dutycycle (nismo 740) do you guys see at peakpower?

I'm just guestimating mine since being bored haha.

I've got 4.54 V and 73% at 20psi @ 7250 rpm. 350 whp area I reckon.

I'll hafta check my logs, but IIRC it was something in the 4.8 MAF and 90% duty (Cobra Maf/60lb injectors 410whp/20psi JWT tune)

[Patrick Bowering]

as for the injectors we just use an aluminum bushing and press them in. and it spools fast but throttle response is brutal.

[HIGHFIVEBETA]

Originally Posted by Pantaloons

sr's should come 11:1 factory is all im saying haha

im sure you're using race gas or meth..?

[TheRealSy90]

Lol i've been running S4 cams on a t25. Fucking rips hard.

[copmagnet]

So, E85 is plentiful around me, and I've considered switching over to it. What I am wondering is, will 740's be big enough for a basically stock SR with a 2871R turbo? Cause I really don't want to have to buy new ones lol. What about if i added the S3 cams to the mix?

[TheRealSy90]

With the cams the 740's probably won't be enough for E85.

[codyace]

Originally Posted by Patrick Bowering

as for the injectors we just use an aluminum bushing and press them in. and it spools fast but throttle response is brutal.

Ohhh, I like that idea with the press in bushings! That's a really slick idea. If you have a program for them, I'll gladly suggest people going to you for them! Any modification required for the manifold? I can't remember how 'good' the casting was in teh holes to provide a good press fit (this side of putting bearing mount or some sort of epoxy around them as you press them in)

Great Idea!

Originally Posted by copmagnet

So, E85 is plentiful around me, and I've considered switching over to it. What I am wondering is, will 740's be big enough for a basically stock SR with a 2871R turbo? Cause I really don't want to have to buy new ones lol. What about if i added the S3 cams to the mix?

While I don't have any first hand experience with the capability of E85, I have been under the impression (forum folklore and word of mouth) that E85 requires 30% or so more fuel capability than a Gas tune.

So with that said, if your goal is 400 whp, and we'll say that to make 100% duty cycle you would use 580cc injectors. 575ccx 1.30 (30% more) = 748cc of injector....so as TheRealSy pointed out, they would be maxed out at 400ish whp, and you'd be better off going with the next size up.

[slider2828]

Originally Posted by codyace

Ohhh, I like that idea with the press in bushings! That's a really slick idea. If you have a program for them, I'll gladly suggest people going to you for them! Any modification required for the manifold? I can't remember how 'good' the casting was in teh holes to provide a good press fit (this side of putting bearing mount or some sort of epoxy around them as you press them in)

Great Idea!



While I don't have any first hand experience with the capability of E85, I have been under the impression (forum folklore and word of mouth) that E85 requires 30% or so more fuel capability than a Gas tune.

So with that said, if your goal is 400 whp, and we'll say that to make 100% duty cycle you would use 580cc injectors. 575ccx 1.30 (30% more) = 748cc of injector....so as TheRealSy pointed out, they would be maxed out at 400ish whp, and you'd be better off going with the next size up.

Hey cody I am thinking about port matching cause I am bored at home and I can do this stuff for fun... Is it basically taking the exhaust or intake gaskets, laying them over the manifolds and using a sharpie and coloring in the material that you want to shave away with a dremel?

[Patrick Bowering]

its going into the isis manifold so i am going to assume they are shitty if i have to i will have them milled oversize and just pressed in iced and they will stay forever. or if they are useable i will use loctite bearing retainer and press them in.

[180sxqc]

I had bougth STI injectors 520cc, now I just sold em and plan on getting 740cc (since I am running a GT2871R I decided to go 740cc right away instead of 520cc)

Is it worth spending the extra money on a brand name (ie, nismo, tomei, hks)

I could probably find a set of used nismo for around 400, but then I would need to clean and flow test and that would bring me to the same amount as buying new ones..

I am debating whether I am getting new ones (tomei's, I've heard they are the same as nismos), used ones or getting something like DW injectors for cheap..

What do you guys think?

[BlackZenkiS14]

I dont trust those low-brand companies. I've used SARD 550cc injectors, and currently using Nismo 740cc injectors.

Its the only way to go IMO.

[EsChassisLove]

Fucking STi injectors. That's what I have. Hitting 90%+ duty cycle already.

Get name brand. Something as important as fuel shouldn't be cheaped out on. I'm gettong SARD 850s. Bigger is better

[TFD]

@180sx: Dont get DW's on a rom tune.
Latency of DW injectors are different then were the rom tunes are mostly programmed for (Nismo/HKS/Tomei 740's).

If you do.. they run shit while cruising. Wot is no problem.
I had them and switched to Nismo's on my jwt ecu.

[180sxqc]

BTW I am going on the dyno for a tune in two weeks (hopefully, as soon as my tuner is available)

I am planning on running 10-12 psi until I get some parts installed (metal g, arp studs, etc)

14+ psi next year (I will be getting a ported stock manifold with an external gate before next summer)

here is a video of my tuner with his sr20 powered 240sx 9 second 240sx 9.99 149.5mph - YouTube

I will be posting a dyno grap when I have it

hoping for 270whp on a mustang dyno

[cotbu]

Some tuners won't tune dw injectors. So just ask you tuner, what injectors he/she prefers.

[tabasco122]

i found its cheaper to just go top feed. jgy makes a fuel rail that is supposedly compatible with top feeds and a freddy/greddy manifold, and they even can customize them to work with a nismo stock style fpr. thats the main reason i didnt want to go top feed, was the fpr that is brand new.

[usdm180sx]

I would NEVER run Deatschwerks. The atomization sucks. The flow might be documented, but redrilled injectors will never have the same atomization quality as Nismo or other NEW injectors with laser cut holes. But that's just me.

[180sxqc]

I have made my mind, I will order new Tomei 740cc off frsport.com

I will post a dyno sheet as soon as I can!!

[boniomario]

..................

[bc.]

Originally Posted by copmagnet

So, E85 is plentiful around me, and I've considered switching over to it. What I am wondering is, will 740's be big enough for a basically stock SR with a 2871R turbo? Cause I really don't want to have to buy new ones lol. What about if i added the S3 cams to the mix?

The question would be better answered if you gave actual power goals, but I believe with that turbo you could exceed the limit of your injectors.

[usdm180sx]

Cody, so it's cool to run stock valvetrain with the s3 cams?

[TheRealSy90]

I've been running stock valvetrain with S4 cams for a while now, and I bang limiter alot. No problems at all.

[codyace]

Originally Posted by slider2828

Hey cody I am thinking about port matching cause I am bored at home and I can do this stuff for fun... Is it basically taking the exhaust or intake gaskets, laying them over the manifolds and using a sharpie and coloring in the material that you want to shave away with a dremel?

That's correct! Just be sur to have a bunch of stones around to clean them up, and then wehatever you can smooth polish (limited by the tool obviously) the better...I've seen some guys get the snake ends and stuff pretty deep in them to help smooth it out....there really isn't anything you can hurt by doing it, so may as well do it up while you have it all off ya know?

Originally Posted by Patrick Bowering

its going into the isis manifold so i am going to assume they are shitty if i have to i will have them milled oversize and just pressed in iced and they will stay forever. or if they are useable i will use loctite bearing retainer and press them in.

Cool. Bearing mount does rock. Would you make those pieces for other owners if I sent them your way? I get this question often and would like to have a product just to tell them to buy.

Originally Posted by 180sxqc

...
Is it worth spending the extra money on a brand name (ie, nismo, tomei, hks)

I could probably find a set of used nismo for around 400, but then I would need to clean and flow test and that would bring me to the same amount as buying new ones...

And that's just the thing, by the time you get a good deal on them, send them to be tested, pay for the procedure and then send it back, it's often another 75-100 dollars out of pocket. SoOOOO many people don't realize that when buying stuff like injectors and I usually alwys suggest new, unless they knew the previous owner/car.

[codyace]

Originally Posted by usdm180sx

Cody, so it's cool to run stock valvetrain with the s3 cams?

Originally Posted by TheRealSy90

I've been running stock valvetrain with S4 cams for a while now, and I bang limiter alot. No problems at all.

As RealSy pointed out, it's 100% safe to run the JWT S3 or S4 cams on the stock valvetrain, up to 7850/8000 rpm. There are TONS of us that have been doing that for years without any issue.

In fact we were just teasing a good friend of mine who has over 40,000 miles on a B14 DE-T setup, no issues at all and it does 5-6 track events a summer now for 6-7 years...dead realiable engine setup, JWT ECU/JWT S3 Cams/28RS car (made 360 whp at 18psi) There is just something tobe said about the JWT stuff in these cars, it is super quality items